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Message #63382
[Bug 1322441] Re: QEMU Windows guest unstable after random amount of time
Tested with kernel - Linux 3.15.0-031500rc7-generic
After 24 hours there's no sign of the problem.
After watching numastat for a while I noticed that with the 3.13.0
kernel the allocated memory for qemu does a really sudden drop from 6GB
down to 2GB. QEMU then freezes with 100% CPU until the allocation goes
back up to 6GB again. On 3.15 the memory stays almost constant and is
migrated towards one numa node as you'd expect. Just speculating but
there must be some kind of page invalidation bug in the numa balancer.
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https://bugs.launchpad.net/bugs/1322441
Title:
QEMU Windows guest unstable after random amount of time
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Ubuntu 14.04, all updates done as of 23/5/2014
Kernel : Linux 3.13.0-24-generic
Qemu : 1.7.1 and 2.0.0 tested
Tested using both Xeon 5620 and 5520 processors, 48GB RAM.
Anywhere from 20 minutes for 3+ hours after booting Windows guests
become unstable. Guest appear to freeze intermittently (VNC console
unresponsive, network pings dropped to guest, frozen IO) for 20-60
seconds at a time which repeats constantly every few minutes and
guests do not recover unless QEMU is killed and the guest is started
again. Whilst the guest is frozen CPU usage of the QEMU process jumps
to 100-150%.
WORKAROUND: Disable automatic NUMA balancing:
echo 0 > /proc/sys/kernel/numa_balancing
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 May 24 01:25 seq
crw-rw---- 1 root audio 116, 33 May 24 01:25 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.14.1-0ubuntu3.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=38dc08b6-55f7-482d-8f82-f048b3dbad56
InstallationDate: Installed on 2013-03-21 (428 days ago)
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
MachineType: Supermicro X8DTT
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=UUID=386ad1f0-7ced-414f-9a09-4c078c36977c ro nomdmonddf nomdmonisw nomdmonddf nomdmonisw
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127.2
RfKill: Error: [Errno 2] No such file or directory
Tags: trusty
Uname: Linux 3.13.0-24-generic x86_64
UpgradeStatus: Upgraded to trusty on 2014-05-21 (2 days ago)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 05/20/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080016
dmi.board.asset.tag: 1234567890
dmi.board.name: X8DTT
dmi.board.vendor: Supermicro
dmi.board.version: 2.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080016:bd05/20/2010:svnSupermicro:pnX8DTT:pvr1234567890:rvnSupermicro:rnX8DTT:rvr2.0:cvnSupermicro:ct17:cvr1234567890:
dmi.product.name: X8DTT
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro
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