** Changed in: linux (Ubuntu)
Assignee: Chris J Arges (arges) => (unassigned)
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https://bugs.launchpad.net/bugs/1508767
Title:
IBM POWER8 unhandled
Marking UCA bug task as Invalid; is this an ongoing issue still? the bug
has not been updated in 10 months so I'm assuming either something got
fixed, or everyone has moved onto something else.
** Changed in: cloud-archive
Status: New => Invalid
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** Tags removed: kernel-key
** Tags added: kernel-da-key
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Title:
IBM POWER8 unhandled signal 11 / SEGV
Status in
So just to reiterate, I'd like to see a core file. Can you run the following
before you run your workload (as root):
Obviously change the directory to some place you'll retain these core files.
echo "/home/ubuntu/core.%e.%p.%h.%t" > /proc/sys/kernel/core_pattern
ulimit -c unlimited
Then run the
** Tags added: kernel-key
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Title:
IBM POWER8 unhandled signal 11 / SEGV
Status in Ubuntu Cloud Archive:
New
Another potentially related issue:
https://bugs.launchpad.net/ubuntu/+source/python-greenlet/+bug/1446974
I just tried comment #26 w/ -O0 and I could get a segfault.
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This is another bug that produces segvs on power8 (could be related, not sure
yet):
https://bugzilla.redhat.com/show_bug.cgi?id=1180633
I was able to reproduce this on wily/4.2 ppc64el machine trivially, and got the
following output:
gcc -g test.c -O2 -o test -fgnu-tm -lpthread
ulimit -c
Ok, at the moment it sounds like getting this to repo in a non-
production environment would be helpful. This way we can do experiments
like running a newer kernel, getting core dumps properly, and running an
instrumented kernel that will dump on _exception with code 30001. I'm
trying on my end to
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-meta-lts-vivid (Ubuntu)
Status: New => Confirmed
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Disabling KSM doesn't seem to have helped. Ryan's
(http://launchpad.net/~fo0bar) been working on getting hwe-w installed
on these compute nodes to see if a more recent kernel will help.
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A full rebuild is in progress at the moment, and nova-compute segfaulted
yesterday, so it doesn't look as though disabling KSM was enough.
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** Also affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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Title:
IBM POWER8 unhandled signal
1) Can you test an lts-wily kernel which is in our CKT PPA:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+packages
2) How many times a day does this actually occur? Does this only occur
on nova nodes? Are they fairly loaded in terms of memory when this
occurs?
3) Another
** Changed in: apparmor (Ubuntu)
Status: New => Invalid
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Title:
IBM POWER8 unhandled signal 11 / SEGV
7 day log rotate:
| hloeung@floette:~$ zgrep -h SEGV /var/log/syslog*
| Oct 28 14:46:34 floette kernel: [1351174.845829] init: rsyslog main process
(2652) killed by SEGV signal
| hloeung@bagon:~$ zgrep -h SEGV /var/log/syslog*
| Nov 2 22:17:03 bagon kernel: [2401829.665556] init:
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