[SOLVED] Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

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claresco-ops
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[SOLVED] Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by claresco-ops » 2018/08/18 02:53:24

Hi,
We updated our lab VM host, running 2.6.32-754.2.1 ( 6.10 ) and libvirt-0.10.2-64/qemu-kvm-0.12.1.2-2.506 to kernel 2.6.32-754.3.5.

Reboot was normal, save for the following messages:
Aug 17 18:54:49 gratiano kernel: ioatdma 0000:00:0f.0: channel enumeration error
Aug 17 18:54:49 gratiano kernel: ioatdma 0000:00:0f.0: Intel(R) I/OAT DMA Engine init failed
Aug 17 18:54:49 gratiano kernel: ioatdma 0000:00:0f.0: PCI INT A disabled

However, upon issuing the commend "virsh start <name-of-guest>" we immediately get kernel panic.

I was only able to capture a photo of part of the output, and so far dmesg and /var/log/* have not revealed the output from any of the kernel panics.

I'll attempt to transcribe a portion here ( if it helps, I can upload the image; or if someone could kindly walk me through capturing the terminal output to text file, that would be better ):

...
RIP [<ffffffffa05232ad>] vmx_vcpu_run+0xebd/0xef0 [kvm_intel]
RSP <ffff800fe4a8fbc8>
CRS: 0000000000000000
---[ end trace e0379b55f6369a31 ]---
Kernel panic - not syncing: Fatal exception
PID: 3021, com: qemu-kvm Tainted: G D I-- ---------- 2.6.32.754.3.5.el6.x86_64 #1
Call Trace:
....

I am attaching current dmidecode output ( in 3 parts ). If there's anything else that could be of help, let me know.
Attachments
grat.dmi-3.txt
(3.24 KiB) Downloaded 44 times
grat.dmi-2.txt
(6.86 KiB) Downloaded 29 times
grat.dmi-1.txt
(7.16 KiB) Downloaded 33 times

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TrevorH
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Re: Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by TrevorH » 2018/08/18 09:52:46

That's a known problem I suspect. Reported by someone else with a processor from that generation - an x5460 and an E5410 and also an even older xeon. It's been reported to RH via https://bugzilla.redhat.com/show_bug.cgi?id=1616384 (private bz since it's a kernel bug). For now I believe your only choice is to stay on the older kernel until this gets fixed in a newer one.
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claresco-ops
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Re: Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by claresco-ops » 2018/09/18 13:31:42

Have not seen any new kernel patches since. Is there any update from upstream on this? ( We don't have access to the redhat bug )

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TrevorH
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Re: Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by TrevorH » 2018/09/18 16:11:06

Only the reporter of a bug has access to it if it is marked as "private" and all kernel related bugzilla entries are marked private by default. The reporter can add other email addresses to the bug and they can get access that way but otherwise you have to talk to RH. I happen to have access to that bz and can see that it hasn't been updated since Aug 22 when someone reported back that the "test kernel provided" works. And no, I don't have access to that either :-)
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claresco-ops
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Re: Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by claresco-ops » 2018/10/11 17:21:27

Thanks!

Good news, I was able to apply the most recent package, kernel-2.6.32-754.6.3.el6.x86_64.rpm, as per
https://access.redhat.com/errata/RHSA-2018:2846 and can confirm the presenting issue is resolved.

Although I don't have access to all the KB articles or BZ entries, the errata specifically references
https://bugzilla.redhat.com/show_bug.cgi?id=1616397, which in turn subsumed https://bugzilla.redhat.com/show_bug.cgi?id=1616384 ( https://bugzilla.redhat.com/show_bug.cgi?id=1616397#c7 )

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TrevorH
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Re: [SOLVED] Kernel 2.6.32-754.3.5 .el6 - Kernel Panic running qemu-kvm guests

Post by TrevorH » 2018/10/11 17:37:50

Yes, the latest kernel for el6 fixes this issue that happened only on older processors.
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