** Also affects: linux (Ubuntu Trusty)
Importance: Medium
Assignee: Stefan Bader (smb)
Status: Confirmed
** Also affects: qemu-kvm (Ubuntu Trusty)
Importance: Medium
Status: Confirmed
** Changed in: qemu-kvm (Ubuntu Trusty)
Status: Confirmed = Invalid
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** Changed in: linux (Ubuntu Trusty)
Status: Confirmed = In Progress
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https://bugs.launchpad.net/bugs/1268906
Title:
cpu soft lockup running kvm
To manage
** Changed in: linux (Ubuntu Trusty)
Status: In Progress = Fix Committed
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https://bugs.launchpad.net/bugs/1268906
Title:
cpu soft lockup running kvm
To
This bug was fixed in the package linux - 3.13.0-22.44
---
linux (3.13.0-22.44) trusty; urgency=low
[ Tim Gardner ]
* Release Tracking Bug
- LP: #1301562
[ dann frazier ]
* [Config] enable linux-tools on arm64
Still a problem on 3.13.0-17-generic.
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https://bugs.launchpad.net/bugs/1268906
Title:
cpu soft lockup running kvm
To manage notifications about this bug go to:
I've had a number of lockups in the last 2 days since upgrading to
Trusty and trying to run a VM under kvm which look to match this issue.
System appears to become unresponsive/hang with what looks like some
kind of I/O lockup, cannot ls in a terminal etc before eventually
display freezes.
@Gareth,
I suspect yours is a different bug, so it would be best if you file a
new bug (so that people trying to debug *this* bug don't mix up symptoms
in their minds, which can wrongly make them rule out a proper cause for
the other bug) against both qemu and linux.
In that bug, please let us
This looks to be drilling down to a problem which seems to only affect
i386 for some reason. But basically the kvm/qemu process gets into a
situation where the thread_info says you have to reschedule but the
per-cpu counterpart prevents that. Now the kvm/qemu process runs wildly
around between
I wonder whether this could be remotely related to bug #1265841. I don'T have
any proof there. Just stumbled over some used_math check (followed by potential
init_fpu) right at the beginning of kvm_arch_vcpu_ioctl_run. There was a longer
thread on LKML about that ([PATCH] Make
OK, its not related to the eager fpu stuff. Just reproduced the same lockup
with a test kernel that contained some potential fixes from upstream. The
interesting part of the backtraces is that the EIP is changing and often not in
a function that should be able to block.
So something seems to
I think the switch to 3.13 may have borked kvm for me. I'll try to
confirm that tomorrow...
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Title:
cpu soft lockup running
Serge has just identified that the trigger for this bug is running kvm
with '-net user': without this option, no issues.
** Changed in: qemu-kvm (Ubuntu)
Status: New = Confirmed
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Latest series of oopses running on a fully updated trusty system.
** Attachment added: dmesg.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+attachment/3958887/+files/dmesg.txt
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Same problem running with -vnc :7
** Attachment added: dmesg.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+attachment/395/+files/dmesg.txt
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To be clear, my host system is a 64-bit capable first-gen i7, but is
actually running fully 32-bit.
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Title:
cpu soft lockup
Latest trusty desktop image (dated 24 Jan) results in the oops when
running with kvm as:
$ kvm --enable-kvm -cdrom ubuntu_trusty-desktop-i386.iso -boot d -m 1024
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On my AMD laptop (x130e thinkpad) with a uptodate trusty amd64 install,
I cannot reproduce this. After installing a 32-bit trusty image, I can
in fact reproduce it:
Jan 27 13:07:05 serge-ThinkPad-X130e kernel: [ 725.593411] kvm: zapping shadow
pages for mmio generation wraparound
Jan 27
Still a problem on 3.13.0-5-generic.
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Title:
cpu soft lockup running kvm
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dmesg from 3.13.0-5-generic kernel.
** Attachment added: dmesg.3.13.0-5-generic
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+attachment/3954151/+files/dmesg.3.13.0-5-generic
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Did this issue start happening after an update/upgrade? Was there a
kernel version where you were not having this particular problem? This
will help determine if the problem you are seeing is the result of the
introduction of a regression, and when this regression was introduced.
If this is a
Same problem with 3.13.0-4-generic. Any progress on this? kvm is
unusable due to this issue.
** Attachment added: dmesg-3.13.0-4-generic.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+attachment/3952909/+files/dmesg-3.13.0-4-generic.txt
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Same problem with 3.13.0-4-generic.
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Title:
cpu soft lockup running kvm
To manage notifications about this bug go to:
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided = Medium
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https://bugs.launchpad.net/bugs/1268906
Title:
cpu soft lockup running kvm
To manage
Alas, same issue using kernel 3.13.0-031300rc8-generic.
** Changed in: linux (Ubuntu)
Status: Incomplete = New
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Title:
See CurrentDmesg.txt for lots of errors such as:
[ 1688.474887] Call Trace:
[ 1688.474914] [f8bae0f3] kvm_vcpu_ioctl+0x433/0x4d0 [kvm]
[ 1688.474924] [c108064f] ? wake_up_state+0xf/0x20
[ 1688.474931] [c10b9795] ? wake_futex+0x65/0x90
[ 1688.474937] [c10babed] ? futex_wake+0x13d/0x160
[
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.13 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
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