** Changed in: linux (Ubuntu)
Status: Triaged = Invalid
** Changed in: linux (Ubuntu Precise)
Status: Triaged = Invalid
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Title:
@Colin,
Yes this is fixed now
** Changed in: checkbox
Status: New = Fix Released
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM
@Brendan, do the fixes to the script resolve this problem?
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
@Brendan the reason why it fails on machines with 10 or more CPUs is
because one is grep'ing for cpu1 which matches on CPU10, CPU11, CPU12,
CPU13, CPU14, CPU15 on the 16 CPU machine. So the script is broken.
It looks like /proc/interrupts CPU* headed columns end with trailing
spaces, so we could
@Colin,
Yes, I had this same thought yesterday. To make the grep do what it's
supposed to do I can just use the '-w' option, meaning it will only
match on word boundaries, so CPU1 won't match CPU11. Along with the
robustness enhancements suggested, I'll be making these changes and
resubmitting.
** Branch linked: lp:~brendan-donegan/checkbox/bug926136_cpu_offlining
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline
** Tags removed: kernel-key
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
exercising frequency governors
To
** Tags removed: blocks-hwcert
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
exercising frequency governors
So this bug isn't a kernel issue at all. the culprit is the following
script:
http://bazaar.launchpad.net/~checkbox-
dev/checkbox/trunk/view/head:/scripts/cpu_offlining
This offlines CPU1, and then tries to grep for cpu1 in /proc/interrupts
for some reason that completely escapes me at the
Just to say, this is one of those issues where bailing out of a
situation early without restoring the state gets us in one big hole. The
script offlines a CPU, then bails out. When detecting any error
condition, code should try to restore back to the proper pre-test state
where possible, e.g.
Back to comment #1, offlining and already offlined CPU is giving you an
invalid argument error. Likewise, onlining and already onlined CPU will
do the same.
The semantics of the interface may have changed between releases, but I
don't think we should class this as a bug since these interfaces do
My intuition is telling me once we have the script fixed it won't be
offlining CPU1 and bailing out and hence we won't see this problem.
Lets get the script sorted out and then re-test.
Incidentally, the semantics of the /sys/devices/system/cpu/cpu*/online
are such that offlining an already
I'll fix up the script so that it:
a.) Avoids offlining CPUs which already are (and vice versa)
b.) Doesn't bail out and leave things in an indeterminate state
I *still* don't understand how this wouldn't impact any system though,
and this bug is only being seen on some.
** Changed in: linux
@Brendan, ping me when you have some results, I will dig into this
deeper if we trip the problem.
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Title:
CPU1 on Dell PowerEdge M610, R715 and
Just for the record, I think the test script needs some more bullet-
proofing.
1. The echos to /sys/devices/system/cpu/$cpu_num/online should be
followed by checks afterwards to make sure EINVAL errors aren't returned
by the kernel. Just a simple bit of sanity checking can't harm.
2. It is
@Brendan, can I get access to this machine so I can debug it further?
Also, we haven't got anything like powernap running during theses tests
have we?
** Changed in: linux (Ubuntu Precise)
Assignee: (unassigned) = Colin King (colin-king)
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Colin: Replied directly via email with connection info.
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
@Colin, I will get this setup. Ping me in the morning to make sure I've
done it.
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes
Is any more information needed here?
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
exercising frequency
Could you also point us to a copy of the cpu_frequency_governors test?
Thanks.
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes
@Leann:
The test in question is checkbox's cpu_scaling_test, the job definition
shows it runs as:
sudo nice -n -20 cpu_scaling_test
this would be located in /usr/share/checkbox/scripts in an installed
system, or you can look at the latest version from trunk here:
Could we confirm if this is still present with Beta-2 images. If so
could you get dmesg and cat /sys/devices/system/cpu/online for the
failed boot. The dmesg should contain information on whether we brought
the cpu up ever.
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Please remember that as mentioned in comment #17 this happens after the
cpu_frequency_governors test is run. This plays around with the
governors used by the CPUs so this might not be getting handled
properly.
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I can get a copy of dmesg after frequency governors is run as well, but
it should be similar to the one attached to the report.
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Title:
CPU1 on
You must mean Beta-1. Yeah, it still happens. Dmesg attached and the
output of the cat command is:
ubuntu@ubuntu:~$ cat /sys/devices/system/cpu/online
0,2-15
** Attachment added: dmesg for Dell M610 after CPU going offline
** Changed in: linux (Ubuntu Precise)
Status: Incomplete = Triaged
** Tags added: kernel-key
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Title:
CPU1 on Dell PowerEdge M610, R715
I can't reproduce this problem except on first boot, so I'm unable to
install new kernels and test them. It's still present in Precise Beta 1
though.
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** Tags removed: bot-stop-nagging
** Also affects: linux (Ubuntu Precise)
Importance: Medium
Status: Incomplete
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Title:
CPU1 on Dell
Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
Hi Joseph,
The problem I have is that if I reboot the system then the problem goes
away and even doesn't reoccur when I run the script which triggers it.
If I could get an ISO that uses the mainline kernel or whichever kernel
you want me to test with then I could be sure it does or doesn't fix
Hi Brendan,
So just to confirm, this issue does not happen in Oneiric. Were you
able to test with the latest 3.3 kernel[0], or are you unable to run
your cpu_frequency_governers test against the mainline kernel?
[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc2-precise/
** Changed
Hi Brendan,
There is no iso for the mainline kernel that I know of. Only the .deb files,
which are available at:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc2-precise/
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Also not the case in the mainline kernel it seems.
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Title:
CPU1 on Dell PowerEdge M610, R715 and IBM X3500 M3 goes offline after
exercising
So, if I reboot the system then all the CPUs are online again.
Furthermore if I rerun cpu_frequency_governors then CPU1 has not gone
offline (all of this with the 3.2.0-12.21 kernel) after it finishes.
This makes it difficult to determine if the problem is really gone in
the mainline kernel. I
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