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Message #144664
[Bug 1512185] Re: qemu-nbd on ARM64 deadlock? Stuck in rt_sigtimedwait([BUS ALRM IO], ..) and futex(0x7f749ec230, FUTEX_WAIT, ...)
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: qemu (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1512185
Title:
qemu-nbd on ARM64 deadlock? Stuck in rt_sigtimedwait([BUS ALRM IO],
..) and futex(0x7f749ec230, FUTEX_WAIT, ...)
Status in linux package in Ubuntu:
Incomplete
Status in linux-meta-lts-vivid package in Ubuntu:
Confirmed
Status in qemu package in Ubuntu:
Confirmed
Bug description:
Hi,
We're seeing this often on our HP Moonshot ARM64 nova-compute nodes
where qemu-nbd processes would lock up. At the same time, there's also
a bunch of kernel spew as follows:
| [605282.018238] block nbd3: Attempted send on closed socket
| [605282.018242] block nbd3: Attempted send on closed socket
| [605282.018245] block nbd3: Attempted send on closed socket
| [605282.018249] block nbd3: Attempted send on closed socket
swirlix01:
| hloeung@swirlix01:~$ uname -a
| Linux swirlix01 3.19.0-30-generic #34~14.04.1-Ubuntu SMP Fri Oct 2 22:15:46 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux
| hloeung@swirlix01:~$ ps afx | grep qe\\mu-nbd
| 27782 ? Ssl 0:00 /usr/bin/qemu-nbd -c /dev/nbd10 /var/lib/nova/instances/ba50751e-56d7-4bc4-8742-1193fe7a138e/disk
| hloeung@swirlix01:~$ sudo cat /proc/$(ps afx | grep qe\\mu-nbd | awk '{ print $1 }')/stack
| [<ffffffc0000875b0>] __switch_to+0x74/0x8c
| [<ffffffc000125dac>] futex_wait_queue_me+0xf4/0x184
| [<ffffffc0001268b4>] futex_wait+0x154/0x24c
| [<ffffffc000128638>] do_futex+0x1a0/0x9ec
| [<ffffffc000128f1c>] SyS_futex+0x98/0x1cc
| [<ffffffc00008642c>] el0_svc_naked+0x20/0x28
| [<ffffffffffffffff>] 0xffffffffffffffff
swirlix08:
| hloeung@swirlix08:~$ uname -a
| Linux swirlix08 3.19.0-31-generic #36~14.04.1-Ubuntu SMP Thu Oct 8 10:50:10 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux
| hloeung@swirlix08:~$ ps afx | grep qe\\mu-nbd
| 31976 ? Ssl 0:00 /usr/bin/qemu-nbd -c /dev/nbd6 /var/lib/nova/instances/92ceb061-2ea4-4212-be20-ab0ded6eb3cd/disk
| hloeung@swirlix08:~$ sudo cat /proc/$(ps afx | grep qe\\mu-nbd | awk '{ print $1 }')/stack
| [<ffffffc0000875b0>] __switch_to+0x74/0x8c
| [<ffffffc000125d6c>] futex_wait_queue_me+0xf4/0x184
| [<ffffffc000126874>] futex_wait+0x154/0x24c
| [<ffffffc0001285f8>] do_futex+0x1a0/0x9ec
| [<ffffffc000128edc>] SyS_futex+0x98/0x1cc
| [<ffffffc00008642c>] el0_svc_naked+0x20/0x28
| [<ffffffffffffffff>] 0xffffffffffffffff
swirlix11:
| hloeung@swirlix11:~$ uname -a
| Linux swirlix11 3.19.0-31-generic #36~14.04.1-Ubuntu SMP Thu Oct 8 10:50:10 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux
| hloeung@swirlix11:~$ ps afx | grep qe\\mu-nbd
| 18149 ? Ssl 0:00 /usr/bin/qemu-nbd -c /dev/nbd3 /var/lib/nova/instances/84cac137-c1e4-46ac-894a-efcd55ef7e05/disk
| hloeung@swirlix11:~$ sudo cat /proc/$(ps afx | grep qe\\mu-nbd | awk '{ print $1 }'/stack
| hloeung@swirlix11:~$ sudo cat /proc/$(ps afx | grep qe\\mu-nbd | awk '{ print $1 }')/stack
| [<ffffffc0000875b0>] __switch_to+0x74/0x8c
| [<ffffffc000125d6c>] futex_wait_queue_me+0xf4/0x184
| [<ffffffc000126874>] futex_wait+0x154/0x24c
| [<ffffffc0001285f8>] do_futex+0x1a0/0x9ec
| [<ffffffc000128edc>] SyS_futex+0x98/0x1cc
| [<ffffffc00008642c>] el0_svc_naked+0x20/0x28
| [<ffffffffffffffff>] 0xffffffffffffffff
| hloeung@swirlix11:~$ sudo strace -f -p 18149
| Process 18149 attached with 3 threads
| [pid 18150] rt_sigtimedwait([BUS ALRM IO], NULL, NULL, 8 <unfinished ...>
| [pid 18149] futex(0x7f749ec230, FUTEX_WAIT, 18152, NULL
| ... (hangs here) ...
We're using the QEMU package backported from Vivid as per LP:1457639
| hloeung@swirlix11:~$ apt-cache policy qemu-utils
| qemu-utils:
| Installed: 1:2.2+dfsg-5expubuntu9.5+bug1457639~ubuntu14.04.1
| Candidate: 1:2.2+dfsg-5expubuntu9.5+bug1457639~ubuntu14.04.1
| Version table:
| *** 1:2.2+dfsg-5expubuntu9.5+bug1457639~ubuntu14.04.1 0
| 500 http://ppa.launchpad.net/canonical-is-sa/arm64-infra-workarounds/ubuntu/ trusty/main arm64 Packages
I'm also not sure if this is related to LP:1505564, which is for amd64/x86_64.
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 25 17:42 seq
crw-rw---- 1 root audio 116, 33 Oct 25 17:42 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.14.1-0ubuntu3.18
Architecture: arm64
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
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
Package: qemu (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: console=ttyS0,9600n8r ro
ProcVersionSignature: Ubuntu 3.19.0-31.36~14.04.1-generic 3.19.8-ckt7
RfKill: Error: [Errno 2] No such file or directory
Tags: trusty uec-images trusty uec-images
Uname: Linux 3.19.0-31-generic aarch64
UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm
_MarkForUpload: True
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