I've just reproduced this crash using the stock 3.2.0-24-39 kernel on
VirtualBox on OS X (Lion).
I created a 2-CPU VM using the latest VirtualBox (4.1.16 r78094), for
Ubuntu 64-bit, default 8GB disk. The steps I followed were:
* Install 64-bit 12.04 Server LTS, minimal install from ISO downloaded
It hopefully prints out the hex content of the data structure I want to
check. But that should all be in the crash console output. Apart from
that just the xen version is still the same 3.4.3-2.6.18 (preserve-AD)
as before.
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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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Bugs, w
We've also seen this on the -24.38 and -24.39 kernels now:
[56843.390534] BUG: unable to handle kernel NULL pointer dereference at
0010
[56843.390551] IP: [] rb_next+0x1/0x50
[56843.390566] PGD 1d20a7067 PUD 1d29a2067 PMD 0
[56843.390575] Oops: [#1] SMP
[56843.390583] CPU 1
[5
Excellent, thanks for that. I'll drop it on a box tomorrow (UK standard
time).
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https://bugs.launchpad.net/bugs/999755
Title:
Kernel crash on EC2 m1.large instances
To manage notifica
A first attempt to get more information can be found at
http://people.canonical.com/~smb/lp999755/ (I took the older -24.37
version as that at least is confirmed to be broken). Up to now I was not
able to cause a similar crash (or in fact any crash) locally. But then I
am not sure I how to get the
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
So from the disassembly and the registers of the crash, it is clear that both
variations at some point do a schedule which calls on to pick_next_task_fair().
As that calls into pick_next_entity() it can be assumed that (struct cfs_rq
*)->nr_running is not 0.
But then (struct cfs_rq *)->rb_leftmo
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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Writing that I noticed that the traces differ based on different
kernels. One set has -24.37 and the other -23.36. So that may just cause
a slightly different timing or location of certain things...
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Also I see that a new kernel has just been pushed out. It cannot hurt
doing tests running that (3.2.0-24.38).
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Title:
Kernel crash on EC2 m1.large
The Xen version is mostly to check for correlations. So far both times
those have been reported it seemed to be a 3.4.3 version (not sure
whether one can still hit other versions, but if then it would be great
to know whether those are affected the same way). I know its not
possible to know what on
Triggered this again by running ohai in a continuous loop, took about 24
hours to occur:
[18438803.627371] BUG: unable to handle kernel NULL pointer dereference at
0010
[18438803.627388] IP: [] rb_next+0x1/0x50
[18438803.627402] PGD 1d0efa067 PUD 1d232d067 PMD 0
[18438803.627411] Oo
BTW Xen version from dmesg is:
Xen version: 3.4.3-2.6.18 (preserve-AD)
This is on EC2 so we have no control over this.
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Title:
Kernel crash on
I've reproduced this by running the OHAI command from the OpsCode Chef
ohai gem (0.6.12) in a loop, although it took nearly 2 days before it
triggered. Basically I ran `gem install ohai; while true; do ohai; done`
in a screen session.
The stack trace is:
[18362917.357055] BUG: unable to handle k
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
The crash itself seems to point at a broken task structures tree while
scheduling during a pipe read. Though this is rather cause not reason. Right
now, nothing obvious strikes. There were a few Xen related patches waiting to
come in through stable but I am not sure those would help here.
Meanwh
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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Title:
Kernel crash on EC2 m1.large instances
To manage notifications about thi
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Title:
Kernel crash on EC2 m1.large instances
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