New: kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
https://bugzilla.kernel.org/show_bug.cgi?id=92291
Bug ID: 92291
Summary: kvm/guest crashes when smp > 1 with AMD FX8300; with
host kernel oops from abrt as well
Product: Virtualization
Version: unspecified
Kernel Version: 3.18.3-201.fc21.x86_64 [host], 3.13.0-39-generic
[ubuntu guest]
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: kvm
Assignee: [email protected]
Reporter: [email protected]
Regression: NoCreated attachment 165171
--> https://bugzilla.kernel.org/attachment.cgi?id=165171&action=edit
kvm register dumps
Overview
========
Whenever I launch a kvm guest in qemu-system-x86_64 with -smp > 1 [-cpu host -enable-kvm of course], the guest kernel crashes at some stage; I've seen the kernel crash before completing boot-up, giving the recognizable kernel crash trace, as well as during 'normal' operation when the guest simply 'freezes'. The host kernel gives me an oops as well, although abrt won't let me report it now as I've got Nvidia proprietary drivers 'tainting' the kernel The bug seems non-specific to guest OS, though mainly it's been *buntu guests, with various different kernels including lowlatency, I even think I've seen the bug with a Windows guest. I've tried building qemu from git sources, no particularly noticeable difference;
Steps to reproduce
==================
1) Start linux guest on a multicore system [AMD FX8* series CPU?] with
$ qemu-system-x86_64 -m 2G -cpu host -smp 4 -enable-kvm -hda [image_file] -vga vmware
2) wait until the guest kernel crashes; virtually every time in less than 10 minutes
Actual results
==============
guest kernel crashes, host kernel gives an oops too, presumably as a result of kvm passthrough
Expected results
================
guest virtual machine should work normally then keep working normally
it would be good to try to pipe dmesg from the guest to the host serial connection, in case that would assist?
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #1 from Mark <[email protected]> --- Created attachment 165181
--> https://bugzilla.kernel.org/attachment.cgi?id=165181&action=edit
serial log during bug; when smp > 1
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #2 from Mark <[email protected]> --- Created attachment 165191
--> https://bugzilla.kernel.org/attachment.cgi?id=165191&action=edit
serial log when no smp
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #3 from Mark <[email protected]> --- Created attachment 165201
--> https://bugzilla.kernel.org/attachment.cgi?id=165201&action=edit
host cpuinfo
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #4 from Mark <[email protected]> --- I should just add that that 'code' segment in the kvm dump is identical every time, I'd be happy to try to track what is causing it, providing someone could give me some pointers to debugging that kind of stuff in more detail
Code=00 01 48 c7 c0 8a b0 00 00 31 db 0f b7 0c 01 b8 05 00 00 00 <0f> 01 c1 0f 1f 44 00 00 5b 41 5c 41 5d 41 5e 5d c3 89 f0 31 c9 f0 0f b0 0d fb 26 e6 00 40
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #5 from Mark <[email protected]> --- Created attachment 166021
--> https://bugzilla.kernel.org/attachment.cgi?id=166021&action=edit
result of guest lsmod; identical for mono-cpu / multi-cpu
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
Alan <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
CC| |[email protected]--- Comment #6 from Alan <[email protected]> --- Can you reproduce it without the Nvidia blob loaded on the host ?
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
Paolo Bonzini <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #7 from Paolo Bonzini <[email protected]> ---
Your guest is probably missing commit c1118b3602c2329671ad5ec8bdf8e374323d6343.
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #8 from Mark <[email protected]> --- Created attachment 166461
--> https://bugzilla.kernel.org/attachment.cgi?id=166461&action=edit
dmesg
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #9 from Mark <[email protected]> --- I'll try both of your suggestions, thanks
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[Bug 92291] kvm/guest crashes when smp > 1 with AMD FX8300; with host kernel oops from abrt as well
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=92291
--- Comment #10 from Mark <[email protected]> --- well thanks very much guys, I'll cautiously say that a patched guest kernel seems to resolve it :-)
the bug seemed to appear even when the host is untainted; serial log says
[ 375.989736] divide error: 0000 [#1] SMP
that's a Kubuntu partition that manages without the proprietary drivers while Fedora won't seem to give graphics properly with nouveau;
not entirely satisfactory of course given that I've now had to modify a virtual machine that it was important to try to avoid modifying for testing purposes; although definitely better than crashing :-)
do we keep the bug report open so that the host kvm handling bug gets fixed too / is this the right place to report that?
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