[Bug 523610] Re: rsyslogd spins CPU on some kernels
@Moses, from what I could see, rsyslog is unable to get the kernel syslog facility regardless of the imklog module presence, even in 10.04. I think the OpenVZ kernel blocks access to this syslog facility for guests. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Upgraded from 10.04 LTS to 12.04 LTS, and I was surprised to see my load average at = 2.00 for days. OpenVZ virtual private server `lsb_release -a |grep Desc`:Ubuntu 12.04.1 LTS `uname -a`: Linux 2.6.32-042stab057.1 x86_64 `dpkg -l rsyslog`: 5.8.6-1ubuntu8 I used the solution suggested in comment #49 above by sdeziel; after disabling that module, rsyslogd is no longer hoarding CPU time, and load average has dropped. big question: after disabling 'imklog', is rsyslog now acquring *less* information than the Ubuntu 10.04 version? I'd like to know what I'm missing out on, if anything. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
same problem here :/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I am still experiencing this on 12.04 (rackspace hosting) $lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description:Ubuntu 12.04.1 LTS Release:12.04 Codename: precise $uname -a Linux ex-test 2.6.32.1-rscloud #15 SMP Mon Feb 22 13:22:15 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux $aptitude show rsyslog | grep Version Version: 5.8.6-1ubuntu8 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
For those running OpenVZ/Proxmox containers, one simple workaround is to disable the imklog module using this : sed -i -e 's/^\$ModLoad imklog/#\$ModLoad imklog/g' /etc/rsyslog.conf This fixes the 100% CPU usage of rsyslog in Natty, Oneiric and Precise containers. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I had what I believe to be the same issue on 12.04 Precise 2.6.32-12-pve x86_64 running in a Proxmox container. I downloaded http://archive.ubuntu.com/ubuntu/pool/main/r/rsyslog/rsyslog_4.2.0-2ubuntu8_amd64.deb, installed, and now the error messages are no longer appearing. Does this bug need to be re-opened? A new bug filed? It's showing fix- released but apparently the issue (or a variation) still exists. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I just upgraded from 10.04 to 12.04 and encountered this problem. As it turns out I was still using the 10.04 kernel and my Grub menu was woefully out of date and so was my kernel. I ran apt-get install grub2 and that fixed my loader problems and also fixed the rsyslogd issue. I assume that the loader was expected to have upgraded between my release revisions but was not upgraded as part of the script or some such issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Still happens when running 11.10 on Proxmox VE 2.0-beta1 in an OpenVZ container: Linux lorentz-s19 2.6.32-7-pve #1 SMP Thu Feb 16 09:00:32 CET 2012 i686 athlon i386 GNU/Linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
same problem under debian squeeze 64bit xen kernel: Linux oneiric 2.6.32-5-xen-amd64 #1 SMP Thu Nov 3 05:42:31 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux fixed with: wget http://mirror.netcologne.de/ubuntu/pool/main/r/rsyslog/rsyslog_4.2.0-2ubuntu8_amd64.deb -O /tmp/rsyslog_4.2.0-2ubuntu8_amd64.deb dpkg -i /tmp/rsyslog_4.2.0-2ubuntu8_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
it happens to me on a VPS with : Linux x.santrex.net 2.6.31.6 #3 SMP Mon May 3 19:58:57 UTC 2010 i686 i686 i386 GNU/Linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
This is still active in 11.04. I am running this under a VPS, running kernel 2.6.32.19-0.2.99.17.22250fd-xen -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I see this issue running 11.10; kernel 2.6.32.33-kvm-i386-20110317-dirty. Temporary workaround was to downgrade to maverick's rsyslogd via: apt-get install rsyslog=4.2.0-2ubuntu8 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
the -rt kernel is still based on 2.6.33. a natty-based system with the -rt kernel is still prone to this issue -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Just to add another option in the spirit of #39. I couldn't find a simple solution and ended up solving this issue by removing rsyslog entirely and now use syslog-ng which does everything I need (only issue when installing was to chown a few logs to root.adm). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/523610 Title: rsyslogd spins CPU on some kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/523610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I solved this issue for me (no kernel hacker) with going back to the last Version 4.2.0-2ubuntu5. (Just want to mention this for other newbies like my) -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Right, that's my understanding as well The design of rsyslog made it very hard to fall back to not de-rooting in the case of an unpatched kernel -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
** Changed in: rsyslog (Ubuntu Lucid) Status: Fix Released = Confirmed -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
I confirm Gianvito's findings with 2.6.33.2, ie that the problem is NOT
resolved. rsyslog isn't using up CPU cycles, but it is failing to read
kmsg.
What I suspect is happening is that attempting a zero-byte read from
ksmg always succeeds, so rsyslog is using the wrong test, eg:
sudo python
import os
f=open('/proc/kmsg')
os.seteuid(1000)
f.read(0)
''
f.read(1)
Traceback (most recent call last):
File stdin, line 1, in module
IOError: [Errno 1] Operation not permitted
ie rsyslog should try and read at least one byte for its test whether
the user can read /proc/kmsg.
Oddly, it looks like the patch (see comment 1 in bug #515623) to allow
user read file access to /proc/kmsg is incorporated in 2.6.33.2, but
it simply isn't working.
--
rsyslogd spins CPU on some kernels
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Re: [Bug 523610] Re: rsyslogd spins CPU on some kernels
On Sat, 2010-04-17 at 06:18 +, Rocko wrote: I confirm Gianvito's findings with 2.6.33.2, ie that the problem is NOT resolved. rsyslog isn't using up CPU cycles, but it is failing to read kmsg. Then this isn't the reported bug! status fixreleased Note that the fact it doesn't read kmsg on older kernels is *DELIBERATE* and will not be fixed. Scott -- Scott James Remnant sc...@ubuntu.com -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Apologies, I'll report it as another bug then. Is it also the intention that rsyslog won't read kmsg on newer kernels? (2.6.33 is a newer kernel, not an older kernel). -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
** Changed in: rsyslog (Ubuntu Lucid) Status: Confirmed = Fix Released -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Just to correct an earlier comment I made: that patch in bug #515623 (comment 1) ISN'T in 2.6.33.2. I applied it to 2.6.33.2 and kernel logging now works again. It looks like the patch will be in the vanilla 2.6.34, though. So hopefully 2.6.33 will be the only newer kernel that doesn't allow kernel logging in Lucid. -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
This bug still persist on Lucid: localhost kernel: imklog: Cannot read proc file system, 1. I have a kernel vanilla 2.6.33.2 without patches and rsyslog 4.2.0-2ubuntu8. -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
@Scott Just to check --- is there a risk that the patch to rsyslog will in effect disable kernel logging on any final lucid release, bearing in mind that not all the kernels are in sync (particularly armel imx51) That would surely be bad, but I've probably misunderstood here... -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Something like this seems the sanest approach. After opening /proc/kmsg, attempt a zero-byte read from it - if that fails with EPERM then we don't load the klog module ** Attachment added: deroot.patchpatch http://launchpadlibrarian.net/39737237/deroot.patchpatch -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
That patch isn't right, needs to seteuid() around the read() call, but the module doesn't know what the uid is going to be; wondering whether hard-coding some number in there will upset pitti -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 523610] Re: rsyslogd spins CPU on some kernels
why not upgrade rsyslogd? Using debian testing's 4.4.2 package fixed it for me. On Wed, Feb 24, 2010 at 12:41 PM, Scott James Remnant sc...@canonical.com wrote: Something like this seems the sanest approach. After opening /proc/kmsg, attempt a zero-byte read from it - if that fails with EPERM then we don't load the klog module ** Attachment added: deroot.patchpatch http://launchpadlibrarian.net/39737237/deroot.patchpatch -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a direct subscriber of a duplicate bug. -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Better version of the patch ** Attachment added: deroot.patchpatch http://launchpadlibrarian.net/39737922/deroot.patchpatch -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Gary: because upgrading doesn't actually fix the problem - if you use Debian's package, your rsyslog is running as *root* - the whole point of this exercise is to make it not need to. If we were to merge rsyslog, we'd still use our deroot.patch, so would still hit the same bug -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
This bug was fixed in the package rsyslog - 4.2.0-2ubuntu8 --- rsyslog (4.2.0-2ubuntu8) lucid; urgency=low * debian/patches/deroot.patch: - After opening /proc/kmsg, set the effective user to an unprivileged one and attempt a zero-byte read from the file. If this succeeds, we know that this will work de-rooted; if this fails, we don't enable kernel-message logging. LP: #523610. -- Scott James Remnant sc...@ubuntu.com Wed, 24 Feb 2010 18:21:54 + ** Changed in: rsyslog (Ubuntu Lucid) Status: Triaged = Fix Released -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
** Tags added: iso-testing -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Same here on 2.6.33-020633rc8-generic; downgrading to 4.2.0-2ubuntu5 fixes it. I'd say 2.6.33 isn't an older kernel... ** Summary changed: - rsyslogd spins CPU on older kernels + rsyslogd spins CPU on some kernels -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 523610] Re: rsyslogd spins CPU on some kernels
Yeah, same here. I have the problem with 2.6.33 as well. -- rsyslogd spins CPU on some kernels https://bugs.launchpad.net/bugs/523610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
