[Bug 394350] Re: RLimitCPU has no effect in Apache
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[Bug 394350] Re: RLimitCPU has no effect in Apache
The actual setrlimit is done by apr. Apache source ships with its own coyp of the apr source under srclib, but that does not get compiled (or used). https://get-mobdro.com Regards, https://get-tubemate.com -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/394350/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
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[Bug 394350] Re: RLimitCPU has no effect in Apache
The actual setrlimit is done by apr. Apache source ships with its own coyp of the apr source under srclib, but that does not get compiled (or used). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/394350/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Assignee: (unassigned) => ahmed yacoub (wheeze) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/394350/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
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[Bug 394350] Re: RLimitCPU has no effect in Apache
At last, here we go. The file /root/apache2-2.2.17/modules/generators/mod_cgi.c has hooks to set rlimits on spawned off instances. However, test.cgi is being executed by /root/apache2-2.2.17/modules/generators/mod_cgid.c. It has those hooks, but they are #ifdef'd out. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
The debian sid package also ifdefs them out, so if limits are working on debian it must be because they are configured to use mod_cgi and not mod_cgid? -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Status: Confirmed = Triaged ** Changed in: apr (Ubuntu) Status: Confirmed = Invalid -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
At last, here we go. The file /root/apache2-2.2.17/modules/generators/mod_cgi.c has hooks to set rlimits on spawned off instances. However, test.cgi is being executed by /root/apache2-2.2.17/modules/generators/mod_cgid.c. It has those hooks, but they are #ifdef'd out. -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
The debian sid package also ifdefs them out, so if limits are working on debian it must be because they are configured to use mod_cgi and not mod_cgid? -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Status: Confirmed = Triaged ** Changed in: apr (Ubuntu) Status: Confirmed = Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
The actual setrlimit is done by apr. Apache source ships with its own coyp of the apr source under srclib, but that does not get compiled (or used). Apache definately sees the RLimit_CPU configuration and sets internal variables accordingly. I've yet to instrument the libapr1-dev code itself to see why it is not calling setrlimit. ** Also affects: apr (Ubuntu) Importance: Undecided Status: New ** Changed in: apr (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
The actual setrlimit is done by apr. Apache source ships with its own coyp of the apr source under srclib, but that does not get compiled (or used). Apache definately sees the RLimit_CPU configuration and sets internal variables accordingly. I've yet to instrument the libapr1-dev code itself to see why it is not calling setrlimit. ** Also affects: apr (Ubuntu) Importance: Undecided Status: New ** Changed in: apr (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Status: Incomplete = New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Importance: Undecided = Medium -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Odd that others are having trouble reproducing. It reproduces for me on a hardy uec image. /proc/$$/limits for the test.cgi process shows unlimited for cpu, and the script is never killed. ** Changed in: apache2 (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
strace -f -o/tmp/output /etc/init.d/apache2 start followed by triggering the script - nowhere in /tmp/output does RLIMIT_CPU get set. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
verified under natty as well -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Status: Incomplete = New -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
** Changed in: apache2 (Ubuntu) Importance: Undecided = Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Odd that others are having trouble reproducing. It reproduces for me on a hardy uec image. /proc/$$/limits for the test.cgi process shows unlimited for cpu, and the script is never killed. ** Changed in: apache2 (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
strace -f -o/tmp/output /etc/init.d/apache2 start followed by triggering the script - nowhere in /tmp/output does RLIMIT_CPU get set. -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
verified under natty as well -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I was asked privately whether I found a solution. We wasted too much time trying to convince people that we had a credible problem report, and then it seemed that no one was prepared to actually do anything with the information. After that time waste, we decided to give up on RLimitCPU on Ubuntu, and focused our energies elsewhere. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I was asked privately whether I found a solution. We wasted too much time trying to convince people that we had a credible problem report, and then it seemed that no one was prepared to actually do anything with the information. After that time waste, we decided to give up on RLimitCPU on Ubuntu, and focused our energies elsewhere. -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I am experiencing exactly the same problem as reported by Neal in 2009. I am running the latest Apache2 from Ubuntu 10.10 repository. RLimitCPU does not kill any of my processes. ** Changed in: apache2 (Ubuntu) Status: Invalid = Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I am experiencing exactly the same problem as reported by Neal in 2009. I am running the latest Apache2 from Ubuntu 10.10 repository. RLimitCPU does not kill any of my processes. ** Changed in: apache2 (Ubuntu) Status: Invalid = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/394350 Title: RLimitCPU has no effect in Apache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Here is the virtual host config from the procedure documented in: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/394350/comments/15 It is file: /etc/apache2/sites-available/default ** Attachment added: default http://launchpadlibrarian.net/29096236/default -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Here is the virtual host config from the procedure documented in: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/394350/comments/15 It is file: /etc/apache2/sites-available/default ** Attachment added: default http://launchpadlibrarian.net/29096236/default -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Can you attach the virtual host config that you are seeing the issue with? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Can you attach the virtual host config that you are seeing the issue with? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I have just reproduced the problem with a fresh install with latest updates, and kept a detailed log as I did so. Perhaps someone can spot something I am doing wrong? I would assume that I'm doing something wrong, except comparable things work on Debian and with upstream, and my users also experienced the problem independently before I did. A fresh pair of eyes on this would be appreciated! * Download Ubuntu Server 8.04.2 for i386, and burn it to a CD-R. I used the following, as fetched on 2009-07-01: http://ftp-mirror.internap.com/pub/ubuntu-releases/hardy/ubuntu-8.04.2-server-i386.iso * Use machine IBM/Lenovo ThinkPad T60 with Intel Core Duo (32-bit X86). (Note that we have also observed the same behavior on 64-bit server hardware.) * Plug machine into Ethernet. * Boot the CD-R and do the following: * Language: English * From CD boot menu, select: Check CD for defects. Result: The CD-ROM integrity test was successful. The CD-ROM is valid. Reboot system. * Language: English * From CD boot menu, select: Test memory. Reboot after a lot of successful testing passing. * Language: English * From CD boot menu, select: Install Ubuntu Server. * Choose language: English * Country: United States * Detect keyboard layout: No. * Keyboard origin: USA * Keyboard layout: USA * Wait for some device scanning and installing and DHCP. * Hostname: myserver * Time zone: Eastern * Partition disks: Guided - use entire disk. Write changes to disk. * Wait for partitioning and fs creation. * Full name of new user: John Smith * Username: john * Supply password. * No HTTP proxy. * Additional software selection: OpenSSH server * Wait, then remove CD when ejected, then let reboot. * SSH into myserver as john from another machine. Subsequent commands are in this shell unless otherwise specified. * sudo su - * apt-get update * apt-get upgrade * Note that the following packages are upgraded (at approx. 10pm EDT 2009-07-10): apparmor apparmor-utils apt apt-utils base-files cpp-4.2 cron dash file gcc-4.2-base initscripts installation-report libcurl3-gnutls libgcc1 libgnutls13 libkrb53 libldap-2.4-2 libmagic1 libsasl2-2 libsasl2-modules libssl0.9.8 libstdc++6 libvolume-id0 linux-image-2.6.24-23-server linux-ubuntu-modules-2.6.24-23-server lsb-base lsb-release ntpdate python-apt sudo sysv-rc sysvutils tasksel tasksel-data tzdata udev update-manager-core * shutdown -r now * Wait for reboot. * SSH into myserver as john from another machine. Subsequent commands are in this shell unless otherwise specified. * sudo su - * apt-get install apache2 * Create file /usr/lib/cgi-bin/forever with the contents: CUT HERE #!/bin/sh echo Content-Type: text/html echo echo BEFORE while true ; do expr 1 + 1 /dev/null done echo AFTER CUT HERE * chmod 0755 /usr/lib/cgi-bin/forever * /etc/init.d/apache2 stop * Edit /etc/apache2/sites-available/default to add an erroneous directive to the top of the file: XXX * /etc/init.d/apache2 start * Verify that the start failed because of the erroneous directive, which confirms this config file really is being used. * Edit /etc/apache2/sites-available/default to remove the erroneous XXX directive. Below the ServerAdmin directive line, add the directive: RLimitCPU 2 2 * /etc/init.d/apache2 start * From a Web browser, access forever CGI (using the appropriate address): http://192.168.1.79/cgi-bin/forever * Observe that BEFORE appears, and the HTTP connection remains open and loading. * Determine PID of the forever process (in this case 5179). ps auxwf | grep forever * cat /proc/5179/limits CUT HERE cat /proc/5179/limits Limit Soft Limit Hard Limit Units Max cpu time unlimitedunlimitedms Max file size unlimitedunlimitedbytes Max data size unlimitedunlimitedbytes Max stack size8388608 unlimitedbytes Max core file size0unlimitedbytes Max resident set unlimitedunlimitedbytes Max processes 2456624566processes Max open files1024 1024 files Max locked memory 3276832768bytes Max address space unlimitedunlimitedbytes Max file locksunlimitedunlimitedlocks Max pending signals 2456624566signals Max msgqueue size 819200 819200 bytes Max nice priority 00 Max realtime priority 00 CUT HERE * Observe that CPU
[Bug 394350] Re: RLimitCPU has no effect in Apache
I have just reproduced the problem with a fresh install with latest updates, and kept a detailed log as I did so. Perhaps someone can spot something I am doing wrong? I would assume that I'm doing something wrong, except comparable things work on Debian and with upstream, and my users also experienced the problem independently before I did. A fresh pair of eyes on this would be appreciated! * Download Ubuntu Server 8.04.2 for i386, and burn it to a CD-R. I used the following, as fetched on 2009-07-01: http://ftp-mirror.internap.com/pub/ubuntu-releases/hardy/ubuntu-8.04.2-server-i386.iso * Use machine IBM/Lenovo ThinkPad T60 with Intel Core Duo (32-bit X86). (Note that we have also observed the same behavior on 64-bit server hardware.) * Plug machine into Ethernet. * Boot the CD-R and do the following: * Language: English * From CD boot menu, select: Check CD for defects. Result: The CD-ROM integrity test was successful. The CD-ROM is valid. Reboot system. * Language: English * From CD boot menu, select: Test memory. Reboot after a lot of successful testing passing. * Language: English * From CD boot menu, select: Install Ubuntu Server. * Choose language: English * Country: United States * Detect keyboard layout: No. * Keyboard origin: USA * Keyboard layout: USA * Wait for some device scanning and installing and DHCP. * Hostname: myserver * Time zone: Eastern * Partition disks: Guided - use entire disk. Write changes to disk. * Wait for partitioning and fs creation. * Full name of new user: John Smith * Username: john * Supply password. * No HTTP proxy. * Additional software selection: OpenSSH server * Wait, then remove CD when ejected, then let reboot. * SSH into myserver as john from another machine. Subsequent commands are in this shell unless otherwise specified. * sudo su - * apt-get update * apt-get upgrade * Note that the following packages are upgraded (at approx. 10pm EDT 2009-07-10): apparmor apparmor-utils apt apt-utils base-files cpp-4.2 cron dash file gcc-4.2-base initscripts installation-report libcurl3-gnutls libgcc1 libgnutls13 libkrb53 libldap-2.4-2 libmagic1 libsasl2-2 libsasl2-modules libssl0.9.8 libstdc++6 libvolume-id0 linux-image-2.6.24-23-server linux-ubuntu-modules-2.6.24-23-server lsb-base lsb-release ntpdate python-apt sudo sysv-rc sysvutils tasksel tasksel-data tzdata udev update-manager-core * shutdown -r now * Wait for reboot. * SSH into myserver as john from another machine. Subsequent commands are in this shell unless otherwise specified. * sudo su - * apt-get install apache2 * Create file /usr/lib/cgi-bin/forever with the contents: CUT HERE #!/bin/sh echo Content-Type: text/html echo echo BEFORE while true ; do expr 1 + 1 /dev/null done echo AFTER CUT HERE * chmod 0755 /usr/lib/cgi-bin/forever * /etc/init.d/apache2 stop * Edit /etc/apache2/sites-available/default to add an erroneous directive to the top of the file: XXX * /etc/init.d/apache2 start * Verify that the start failed because of the erroneous directive, which confirms this config file really is being used. * Edit /etc/apache2/sites-available/default to remove the erroneous XXX directive. Below the ServerAdmin directive line, add the directive: RLimitCPU 2 2 * /etc/init.d/apache2 start * From a Web browser, access forever CGI (using the appropriate address): http://192.168.1.79/cgi-bin/forever * Observe that BEFORE appears, and the HTTP connection remains open and loading. * Determine PID of the forever process (in this case 5179). ps auxwf | grep forever * cat /proc/5179/limits CUT HERE cat /proc/5179/limits Limit Soft Limit Hard Limit Units Max cpu time unlimitedunlimitedms Max file size unlimitedunlimitedbytes Max data size unlimitedunlimitedbytes Max stack size8388608 unlimitedbytes Max core file size0unlimitedbytes Max resident set unlimitedunlimitedbytes Max processes 2456624566processes Max open files1024 1024 files Max locked memory 3276832768bytes Max address space unlimitedunlimitedbytes Max file locksunlimitedunlimitedlocks Max pending signals 2456624566signals Max msgqueue size 819200 819200 bytes Max nice priority 00 Max realtime priority 00 CUT HERE * Observe that CPU
[Bug 394350] Re: RLimitCPU has no effect in Apache
I have re-tested on i386 hardy and got the same results as ajmitch: the test program was correctly killed. Neil, if you can post steps to reproduce, I would be very thankful. Sorry it's not any easy problem to uncover. :( -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I have re-tested on i386 hardy and got the same results as ajmitch: the test program was correctly killed. Neil, if you can post steps to reproduce, I would be very thankful. Sorry it's not any easy problem to uncover. :( -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I appreciate the attempts Ubuntu people have made to reproduce the problem, and I'm baffled that myself and my users are still easily reproducing the problem. I once again reproduced the problem on one of my Ubuntu configurations, and observed through /proc/pid/limits that the limits are unlimited on the process. We have had multiple people reproduce this problem here, on multiple systems, at multiple sites, with fresh installs, on both i386 and amd64, and everyone saw the same erroneous behavior with Ubuntu packagings but not with upstream. Nor did Debian exhibit this problem. We have also been aware that the limit was in CPU seconds, not wall clock time. (I was very skeptical myself, when they first called me in as a fresh pair of eyes, after very experienced people there were stumped.) I suppose the only thing to do at this point, as far as this bug report is concerned,are: (1) for me to start once again with a fresh Ubuntu install, and this time to carefully log each step in a form appropriate for this bug report (perhaps video it, too! :); and (2) for me to get the problematic Apache process debuggable and locate the erroneous behavior that way. Realistically, this problem is so bizarre and has been so time-consuming that (though I wouldn't attribute fault til we know the cause), my users will also have to consider known-good options, such as running upstream Apache or switching the distro to Debian stable or RHEL/CentOS. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Why is the status of this still Incomplete? I realize that the holiday weekend here in the US probably interrupted work, but it's now almost a week idling on what appears to be an Ubuntu- specific security/stability problem for Apache servers. I really need to know if Ubuntu has an imminent solution. I can't tell whether anyone of the dozens of people copied on this bug has tried to reproduce the problem yet. I'm afraid this problem and then lack of response is seriously damaging my users' confidence in Ubuntu Server, after they recently switched to it. Thank you. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
this is Ubuntu-specific? ** Changed in: apache2 (Ubuntu) Status: Incomplete = New -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
What are the specific configurations you're using so that developers can set up a test to reproduce what you're seeing? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Based on http://httpd.apache.org/docs/2.0/mod/core.html#rlimitcpu I set a 2
second soft and hard limit on the default website
/etc/apache2/sites-enabled/000-default:
VirtualHost *:80
ServerAdmin webmas...@localhost
RLimitCPU 2 2
...
I put the example script above into /usr/lib/cgi-bin/test.cgi, and ran it. It
was correctly killed, observed via strace:
...
[pid 10848] write(1, 2\n, 2) = 2
[pid 10848] close(1)= 0
[pid 10848] munmap(0x7f4f160ed000, 4096) = 0
[pid 10848] close(2)= 0
[pid 10848] exit_group(0) = ?
Process 10848 detached
... wait4 resumed [{WIFEXITED(s) WEXITSTATUS(s) == 0}], 0, NULL) = 10848
--- SIGCHLD (Child exited) @ 0 (0) ---
+++ killed by SIGKILL +++
Process 5234 detached
** Changed in: apache2 (Ubuntu)
Status: New = Invalid
--
RLimitCPU has no effect in Apache
https://bugs.launchpad.net/bugs/394350
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to apache2 in ubuntu.
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Ubuntu-server-bugs@lists.ubuntu.com
Modify settings or unsubscribe at:
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[Bug 394350] Re: RLimitCPU has no effect in Apache
As an added note, you can examine a process's rlimits via /proc/$pid/limits -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
* Simply take a fresh Ubuntu 8.04 install (which gets Apache 2.2.8), add RLimitCPU 2 2 to the default Apache site file, drop the script above into the cgi-bin dir, and run the CGI. You'll see that the CGI process is *not* killed. * Do the same thing on a Debian stable system (which gets Apache 2.2.9), and the CGI process *is* killed. * Rig up a build of upstream Apache 2.2.8 (no Ubuntu patches) to use esssentially the same config file tree as a fresh Ubuntu 8.04 install (and running on the same Ubuntu 8.04 installed system), and the CGI process *is* killed. At this point, unless I made a mistake while troubleshooting, the problem appears to be in Ubuntu-specific patches to Apache. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I've tested this on hardy (i386) with all updates installed. The only difference I can see at a glance is i386 vs amd64 with regards to testing this. I've tested with the same method as Kees, in that /etc/apache2/sites-enabled/000-default has: VirtualHost * ServerAdmin webmas...@localhost RLimitCPU 2 2 ... The apache2 process was restarted with /etc/init.d/apache2 restart, with the same CGI script installed. After hitting the URL, the process is definitely running without being killed, and the limit has been set on that child process: :0: sudo cat /proc/2089/limits Limit Soft Limit Hard Limit Units Max cpu time 22ms With this, the kernel doesn't appear to be killing the process quickly, however I suspect that this is due to system time vs CPU time - the example given spends a fair bit of time forking processes, but once it reaches 0:02.00 in top, the kernel kills the process, even though about a minute of wall clock time has elapsed. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
(I had not seen Kees Cook's failure to reproduce before I posted my last message.) I have just reproduced the problem with a fresh install of 9.04 on an X86 box. (I do not have a fresh 8.04 install at the moment.) I am at a loss to explain why Kees Cook could not reproduce the problem. I wonder whether he was using a fresh install of an LTS version, or some other configuration. I request that this bug be reopened. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Can you show that your CPU time (ps auwwx | grep test.cgi) is exceeding the limits set (or lack of set limit) for the process that Apache spawns (cat /proc/$(pidof test.cgi)/limits)? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Why is the status of this still Incomplete? I realize that the holiday weekend here in the US probably interrupted work, but it's now almost a week idling on what appears to be an Ubuntu- specific security/stability problem for Apache servers. I really need to know if Ubuntu has an imminent solution. I can't tell whether anyone of the dozens of people copied on this bug has tried to reproduce the problem yet. I'm afraid this problem and then lack of response is seriously damaging my users' confidence in Ubuntu Server, after they recently switched to it. Thank you. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
this is Ubuntu-specific? ** Changed in: apache2 (Ubuntu) Status: Incomplete = New -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
What are the specific configurations you're using so that developers can set up a test to reproduce what you're seeing? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Based on http://httpd.apache.org/docs/2.0/mod/core.html#rlimitcpu I set a 2
second soft and hard limit on the default website
/etc/apache2/sites-enabled/000-default:
VirtualHost *:80
ServerAdmin webmas...@localhost
RLimitCPU 2 2
...
I put the example script above into /usr/lib/cgi-bin/test.cgi, and ran it. It
was correctly killed, observed via strace:
...
[pid 10848] write(1, 2\n, 2) = 2
[pid 10848] close(1)= 0
[pid 10848] munmap(0x7f4f160ed000, 4096) = 0
[pid 10848] close(2)= 0
[pid 10848] exit_group(0) = ?
Process 10848 detached
... wait4 resumed [{WIFEXITED(s) WEXITSTATUS(s) == 0}], 0, NULL) = 10848
--- SIGCHLD (Child exited) @ 0 (0) ---
+++ killed by SIGKILL +++
Process 5234 detached
** Changed in: apache2 (Ubuntu)
Status: New = Invalid
--
RLimitCPU has no effect in Apache
https://bugs.launchpad.net/bugs/394350
You received this bug notification because you are a member of Ubuntu
Bugs, which is a direct subscriber.
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
As an added note, you can examine a process's rlimits via /proc/$pid/limits -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
* Simply take a fresh Ubuntu 8.04 install (which gets Apache 2.2.8), add RLimitCPU 2 2 to the default Apache site file, drop the script above into the cgi-bin dir, and run the CGI. You'll see that the CGI process is *not* killed. * Do the same thing on a Debian stable system (which gets Apache 2.2.9), and the CGI process *is* killed. * Rig up a build of upstream Apache 2.2.8 (no Ubuntu patches) to use esssentially the same config file tree as a fresh Ubuntu 8.04 install (and running on the same Ubuntu 8.04 installed system), and the CGI process *is* killed. At this point, unless I made a mistake while troubleshooting, the problem appears to be in Ubuntu-specific patches to Apache. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I've tested this on hardy (i386) with all updates installed. The only difference I can see at a glance is i386 vs amd64 with regards to testing this. I've tested with the same method as Kees, in that /etc/apache2/sites-enabled/000-default has: VirtualHost * ServerAdmin webmas...@localhost RLimitCPU 2 2 ... The apache2 process was restarted with /etc/init.d/apache2 restart, with the same CGI script installed. After hitting the URL, the process is definitely running without being killed, and the limit has been set on that child process: :0: sudo cat /proc/2089/limits Limit Soft Limit Hard Limit Units Max cpu time 22ms With this, the kernel doesn't appear to be killing the process quickly, however I suspect that this is due to system time vs CPU time - the example given spends a fair bit of time forking processes, but once it reaches 0:02.00 in top, the kernel kills the process, even though about a minute of wall clock time has elapsed. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
(I had not seen Kees Cook's failure to reproduce before I posted my last message.) I have just reproduced the problem with a fresh install of 9.04 on an X86 box. (I do not have a fresh 8.04 install at the moment.) I am at a loss to explain why Kees Cook could not reproduce the problem. I wonder whether he was using a fresh install of an LTS version, or some other configuration. I request that this bug be reopened. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Can you show that your CPU time (ps auwwx | grep test.cgi) is exceeding the limits set (or lack of set limit) for the process that Apache spawns (cat /proc/$(pidof test.cgi)/limits)? -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I just verified that Ubuntu's 9.04's packaging of Apache 2.2.11 also exhibits this problem. Looking through the Ubuntu patches to upstream Apache 2.2.8 (where we initially noticed the problem), I haven't yet found an obvious cause. The people who did the packaging or patches on this would be able to debug this faster than me. Otherwise, I'll have to start tracing through unfamiliar Apache source to debug it that way. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
I just verified that Ubuntu's 9.04's packaging of Apache 2.2.11 also exhibits this problem. Looking through the Ubuntu patches to upstream Apache 2.2.8 (where we initially noticed the problem), I haven't yet found an obvious cause. The people who did the packaging or patches on this would be able to debug this faster than me. Otherwise, I'll have to start tracing through unfamiliar Apache source to debug it that way. -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Do you have a script or a cgi that tests this bug? Thanks chuck ** Changed in: apache2 (Ubuntu) Status: New = Incomplete -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Chuck Short wrote at 07/02/2009 09:51 AM: Do you have a script or a cgi that tests this bug? The following cgi-bin script can be used to trigger RLimitCPU in a correctly functioning Apache. Setting the limits to 2 seconds of CPU time typically permits around 10 seconds of real time to watch the time grow in top. On a correctly functioning Apache, the process terminates shortly after 2 seconds of CPU time are incurred. Thanks. #!/bin/sh echo Content-Type: text/html echo echo BEFORE while true ; do expr 1 + 1 /dev/null done echo AFTER -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394350] Re: RLimitCPU has no effect in Apache
Do you have a script or a cgi that tests this bug? Thanks chuck ** Changed in: apache2 (Ubuntu) Status: New = Incomplete -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 394350] Re: RLimitCPU has no effect in Apache
Chuck Short wrote at 07/02/2009 09:51 AM: Do you have a script or a cgi that tests this bug? The following cgi-bin script can be used to trigger RLimitCPU in a correctly functioning Apache. Setting the limits to 2 seconds of CPU time typically permits around 10 seconds of real time to watch the time grow in top. On a correctly functioning Apache, the process terminates shortly after 2 seconds of CPU time are incurred. Thanks. #!/bin/sh echo Content-Type: text/html echo echo BEFORE while true ; do expr 1 + 1 /dev/null done echo AFTER -- RLimitCPU has no effect in Apache https://bugs.launchpad.net/bugs/394350 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
