[Bug 1314697] Re: Upon upgrade, DNS resolution no longer works
I'm seeing this too, strace show it spinning on: select(8, [0 3 6 7], [], [6], NULL) = 1 (in [0]) recvmsg(0, 0x7fffdb2aa6d0, 0) = -1 ENOTSOCK (Socket operation on non-socket) accept(0, 0, NULL) = -1 ENOTSOCK (Socket operation on non-socket) select(8, [0 3 6 7], [], [6], NULL) = 1 (in [0]) recvmsg(0, 0x7fffdb2aa6d0, 0) = -1 ENOTSOCK (Socket operation on non-socket) accept(0, 0, NULL) = -1 ENOTSOCK (Socket operation on non-socket) So we're getting ENOTSOCK on fd 0, which is /dev/null : -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1314697 Title: Upon upgrade, DNS resolution no longer works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1314697/+subscriptions -- 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 1314708] [NEW] dnsmasq is consuming ~100% of one CPU
Public bug reported: I did a clean install of trusty and upgraded to utopic on a desktop and on the next reboot I observed one CPU was being totally pegged by dnsmasq top: top - 17:15:32 up 16 min, 4 users, load average: 1.02, 1.02, 0.69 Tasks: 197 total, 2 running, 193 sleeping, 2 stopped, 0 zombie %Cpu(s): 15.8 us, 9.5 sy, 1.1 ni, 73.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 7930260 total, 1369624 used, 6560636 free,34480 buffers KiB Swap: 8139772 total,0 used, 8139772 free. 767456 cached Mem PID USER PR NIVIRTRESSHR S %CPU %MEM TIME+ COMMAND 1433 nobody20 0 42248 1664 1376 R 100.0 0.0 15:55.66 dnsmasq 1 root 20 0 34152 3316 1460 S 0.0 0.0 0:00.92 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 strace show it spinning on: select(8, [0 3 6 7], [], [6], NULL) = 1 (in [0]) recvmsg(0, 0x7fffdb2aa6d0, 0) = -1 ENOTSOCK (Socket operation on non-socket) accept(0, 0, NULL) = -1 ENOTSOCK (Socket operation on non-socket) select(8, [0 3 6 7], [], [6], NULL) = 1 (in [0]) recvmsg(0, 0x7fffdb2aa6d0, 0) = -1 ENOTSOCK (Socket operation on non-socket) accept(0, 0, NULL) = -1 ENOTSOCK (Socket operation on non-socket) So we're getting ENOTSOCK on fd 0, which is /dev/null : total 0 dr-x-- 2 root root 0 Apr 30 17:21 . dr-xr-xr-x 9 nobody dip 0 Apr 30 17:21 .. lrwx-- 1 root root 64 Apr 30 17:21 0 - /dev/null lrwx-- 1 root root 64 Apr 30 17:21 1 - /dev/null lrwx-- 1 root root 64 Apr 30 17:21 2 - /dev/null lrwx-- 1 root root 64 Apr 30 17:21 3 - socket:[12881] lrwx-- 1 root root 64 Apr 30 17:21 4 - socket:[12883] lrwx-- 1 root root 64 Apr 30 17:21 5 - socket:[12884] lrwx-- 1 root root 64 Apr 30 17:21 6 - socket:[12885] lr-x-- 1 root root 64 Apr 30 17:21 7 - pipe:[13568] l-wx-- 1 root root 64 Apr 30 17:21 8 - pipe:[13568] lrwx-- 1 root root 64 Apr 30 17:21 9 - socket:[13570] ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: dnsmasq (not installed) ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 ApportVersion: 2.14.2-0ubuntu1 Architecture: amd64 Date: Wed Apr 30 17:17:00 2014 InstallationDate: Installed on 2014-04-30 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS Trusty Tahr - Release amd64 (20140417) SourcePackage: dnsmasq UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: dnsmasq (Ubuntu) Importance: High Status: New ** Tags: amd64 apport-bug utopic ** Changed in: dnsmasq (Ubuntu) Importance: Undecided = High -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1314708 Title: dnsmasq is consuming ~100% of one CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1314708/+subscriptions -- 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 1314708] Re: dnsmasq is consuming ~100% of one CPU
Sending a bug report by ubuntu-bug is impossible since I can't resolve any hostnames with dnsmasq borked like this. This happens on every reboot too. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1314708 Title: dnsmasq is consuming ~100% of one CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1314708/+subscriptions -- 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 217815] Re: Installation stalls randomly until a key is pressed
It maybe worth booting with clocksource set to one of the alternative clocksources available on your machine. One can see which clocksources are available using: cat /sys/devices/system/clocksource/clocksource0/available_clocksource and then boot with clocksource=xxx (where xxx is one of the clocksoures). I cannot test this as I don't have the ability to run kvm on my hardware setup here. Can somebody try this and checks if it helps or not. -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Server Team, which is a direct subscriber. -- 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 217815] Re: Installation stalls randomly until a key is pressed
A couple of points worth mulling over to corner this one.. 1. Is the hanging a function of memory size - for example, the buffer cache filling up after a certain amount of time and then pdflush kicking in very aggressively doing dirty data writing backs as fast as it can. In which case, one may see the system resume again after a (long) period of time once pdflush is complete. It may be worth tweaking with the /proc/sys/vm/dirty* options to see if this trips the problem more frequently. Also, it may be worth seeing if doing the install with small memory kvm virtual machines shows this problem earlier than large memory virtual machines just to see if it is a buffer cache write back cpu starvation issue. 2. From my understanding dd is being used to zero the encrypted disk. Does changing the dd block size to a very large size trip this bug earlier as one gets more throughput than the normal (small) block size default? 3. Is the hanging resumed by an external interrupt (keyboard, mouse) because of the scheduler boosts interactive sessions temporarily and hence interfering (in a positive way) to the balancing of the encryption kernel space thread, dd and pdflush? -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Server Team, which is a direct subscriber. -- 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
