* [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes
@ 2012-06-14 15:51 Richard W.M. Jones
2012-06-19 10:16 ` [Qemu-devel] [Bug 1013241] " Richard W.M. Jones
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Richard W.M. Jones @ 2012-06-14 15:51 UTC (permalink / raw)
To: qemu-devel
Public bug reported:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1013241
Title:
qemu-system-ppc64 hanging occasionally in disk writes
Status in QEMU:
New
Bug description:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions
^ permalink raw reply [flat|nested] 6+ messages in thread* [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
2012-06-14 15:51 [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes Richard W.M. Jones
@ 2012-06-19 10:16 ` Richard W.M. Jones
2012-06-19 10:42 ` Benjamin Herrenschmidt
2012-06-19 10:54 ` Richard W.M. Jones
` (2 subsequent siblings)
3 siblings, 1 reply; 6+ messages in thread
From: Richard W.M. Jones @ 2012-06-19 10:16 UTC (permalink / raw)
To: qemu-devel
I switched to using virtio-scsi (instead of virtio-blk). This appears to have solved
this problem, although it brings another problem. I also tried vscsi, which fixes
both problems.
Therefore I will (not definitively) claim that the problem lies somewhere in virtio-blk,
but a workaround seems to be available.
--
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https://bugs.launchpad.net/bugs/1013241
Title:
qemu-system-ppc64 hanging occasionally in disk writes
Status in QEMU:
New
Bug description:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
2012-06-19 10:16 ` [Qemu-devel] [Bug 1013241] " Richard W.M. Jones
@ 2012-06-19 10:42 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 6+ messages in thread
From: Benjamin Herrenschmidt @ 2012-06-19 10:42 UTC (permalink / raw)
To: Bug 1013241; +Cc: qemu-devel
On Tue, 2012-06-19 at 10:16 +0000, Richard W.M. Jones wrote:
> I switched to using virtio-scsi (instead of virtio-blk). This appears to have solved
> this problem, although it brings another problem. I also tried vscsi, which fixes
> both problems.
>
> Therefore I will (not definitively) claim that the problem lies somewhere in virtio-blk,
> but a workaround seems to be available.
What was the virtio-scsi problem ? (Other than SLOF doesn't know about
it yet :-) I haven't audited/tested it so it might have endian issues...
I have reproduced a similar hang with vscsi in full emulation, I haven't
observed your problem with virtio-blk, I plan to spend more time doing
some torture testing & debugging this week see if I can find out what's
going on.
BTW. What was your guest kernel version ?
Cheers,
Ben.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
2012-06-14 15:51 [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes Richard W.M. Jones
2012-06-19 10:16 ` [Qemu-devel] [Bug 1013241] " Richard W.M. Jones
@ 2012-06-19 10:54 ` Richard W.M. Jones
2018-04-13 21:28 ` Thomas Huth
2018-06-13 4:17 ` Launchpad Bug Tracker
3 siblings, 0 replies; 6+ messages in thread
From: Richard W.M. Jones @ 2012-06-19 10:54 UTC (permalink / raw)
To: qemu-devel
The problem with virtio-scsi is only a single disk shows up:
https://bugs.launchpad.net/qemu/+bug/1013691
I've been using guest kernels 3.3.4 and 3.5.0-rc2+ (ie. Linus git), and
both behave the same way.
--
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1013241
Title:
qemu-system-ppc64 hanging occasionally in disk writes
Status in QEMU:
New
Bug description:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions
^ permalink raw reply [flat|nested] 6+ messages in thread* [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
2012-06-14 15:51 [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes Richard W.M. Jones
2012-06-19 10:16 ` [Qemu-devel] [Bug 1013241] " Richard W.M. Jones
2012-06-19 10:54 ` Richard W.M. Jones
@ 2018-04-13 21:28 ` Thomas Huth
2018-06-13 4:17 ` Launchpad Bug Tracker
3 siblings, 0 replies; 6+ messages in thread
From: Thomas Huth @ 2018-04-13 21:28 UTC (permalink / raw)
To: qemu-devel
Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?
** Changed in: qemu
Status: New => Incomplete
--
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1013241
Title:
qemu-system-ppc64 hanging occasionally in disk writes
Status in QEMU:
Incomplete
Bug description:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions
^ permalink raw reply [flat|nested] 6+ messages in thread* [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
2012-06-14 15:51 [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes Richard W.M. Jones
` (2 preceding siblings ...)
2018-04-13 21:28 ` Thomas Huth
@ 2018-06-13 4:17 ` Launchpad Bug Tracker
3 siblings, 0 replies; 6+ messages in thread
From: Launchpad Bug Tracker @ 2018-06-13 4:17 UTC (permalink / raw)
To: qemu-devel
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1013241
Title:
qemu-system-ppc64 hanging occasionally in disk writes
Status in QEMU:
Expired
Bug description:
I found last week that qemu-system-ppc64 (from git) hangs occasionally
under load, and I have a reproducer for it now. Unfortunately the
reproducer really takes a long time to run -- usually I can get a hang
in under 12 hours.
Here is the reproducer case:
https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
Notes:
(1) Verified by one other person (other than me). Happens on both
ppc64 and x86-64 host.
(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
3.5.0 that I compiled myself. The test case above contains 3.3.4-5.
(3) Seems to be a problem in qemu, not the guest. The reason I think
this is because I tried to capture a backtrace of the hang using
remote gdb, but gdb just hung when trying to connect to qemu
(gdb connects fine before the bug happens).
(4) Judging by guest messages, appears to be happening when writing
to the disk.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-06-13 4:30 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2012-06-14 15:51 [Qemu-devel] [Bug 1013241] [NEW] qemu-system-ppc64 hanging occasionally in disk writes Richard W.M. Jones
2012-06-19 10:16 ` [Qemu-devel] [Bug 1013241] " Richard W.M. Jones
2012-06-19 10:42 ` Benjamin Herrenschmidt
2012-06-19 10:54 ` Richard W.M. Jones
2018-04-13 21:28 ` Thomas Huth
2018-06-13 4:17 ` Launchpad Bug Tracker
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