We verified the patched kernel does not exhibit the crashing behavior
over a week-long run of Ohai loops on an EC2 large instance. It also
behaves correctly on 2-core a VirtualBox running Ohai loops.
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** Tags removed: verification-needed-precise
** Tags added: verification-done-precise
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https://bugs.launchpad.net/bugs/999755
Title:
Kernel crash in rb_next doing ohai loops
To manage
Awesome, thanks for the nice explanation and the dedication to working
this out. We'll try out the patch on our several test setups as well.
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Title
Stefan, our experience is that it also does not ever happen on just a
single core so it's definitely some scheduler interaction on a multi-
core box. You probably could get a 4 core to do it as well if the
process list were more heavily loaded.
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Ok, that is "good" news. Happy to help with further testing.
** Description changed:
Testcase:
1. apt-get install build-essential ruby-1.9.3 screen
2. gem install chef
- 3. in screen session: while true; oahi; done
+ 3. in screen session: while true; ohai; done
---
We have a numbe
We have had a crash with Stefan's debugging kernel running. Here is the
output (doesn't look like it contains any more information).
[248587.286290] [ cut here ]
[248587.286765] kernel BUG at
/home/smb/precise-amd64/ubuntu-2.6/kernel/sched_fair.c:1239!
[248587.286775] inv
We have the debugging kernel installed on a box that has been happily
crashing for the last few days. We'll see if we can get a good debug
for you from it. What would you like us to gather the next time it
crashes?
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Excellent, thanks for that. I'll drop it on a box tomorrow (UK standard
time).
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Title:
Kernel crash on EC2 m1.large instances
To manage notifica
Stefan, if you have a kernel build with memory dumps to help debug this,
I'm happy to try it.
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Title:
Kernel crash on EC2 m1.large instances
To m
Thanks, we're running tests on the 3.2.0-24.38 kernel now to see if we
can get it to crash in the same way. Yes, this affected both the
previous versions: -24.37 and -23.36.
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Forgot to post this earlier. Re: Brad's request for crash logs.
apport-cli says "No pending crash reports. Try --help for more
information."
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Here's another one if it helps:
[848423.023156] BUG: unable to handle kernel NULL pointer dereference at
0010
[848423.023180] IP: [] rb_next+0x1/0x50
[848423.023194] PGD 18ad83067 PUD 18ad82067 PMD 0
[848423.023203] Oops: [#1] SMP
[848423.023210] CPU 1
[848423.023213] Modules
Hi Stefan, OK. Here's another stack trace:
[47708.053788] BUG: unable to handle kernel NULL pointer dereference at
0010
[47708.053810] IP: [] rb_next+0x1/0x50
[47708.053824] PGD 1d0b83067 PUD 1d0e64067 PMD 0
[47708.053833] Oops: [#1] SMP
[47708.053840] CPU 1
[47708.053843] Mo
Public bug reported:
We have a number of small and large instances running the release
version of 12.04. The small instances have been completely stable.
However, every large instance we have has crashed at a seemingly random
interval. This is repeatable on individual systems, though not within
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https://bugs.launchpad.net/bugs/999755
Title:
Kernel crash on EC2 m1.large instances
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