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https://bugs.launchpad.net/bugs/1771075
Title:
General Protection fault in inotify (fixed upstream)
Status in linux package in Ubuntu:
Incomplete
Bug description:
We've run into some issues where upgrading the kernel from a 4.10
series to a 4.13 series on Ubuntu 16.04 hosts that make heavy use of
inotify causes panics and lockups in the kernel in inotify-related
code. Our particular use case seemed to hit these at a rate of one
every 30 minutes or so when serving up production traffic.
Unfortunately, I have been unable to replicate the issue so far with a
simulated load-testing environment.
When the issue occurs, we get dmesg entries like "BUG: soft lockup -
CPU#0 stuck for 22s!" or "General protection fault: 0000 [#1] SMP
PTI". In the soft lockup case, the host is still up but all I/O
operations stall indefinitely (e.g. typing "sync" into the console
will hang forever). In the protection fault case, the system reboots.
I've attached dmesg output from the two cases to this bugreport.
We have noticed the issue with the following kernels:
- linux-image-4.13.0-1013-gcp
- linux-image-4.13.0-1015-gcp
- linux-image-4.13.0-36-generic
We did _not_ have the issue with
- linux-image-4.10.0-32-generic
I've submitted this bug report from a system which should be
configured identically to our production hosts that were having issue
(the affected hosts were immediately rolled back to 4.10).
This bug appears to have been fixed upstream as of 4.17-rc3 in this
commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d90a10e2444ba5a351fa695917258ff4c5709fa5
I would guess that perhaps this patch should be backported into both
the 4.13 HWE and GCP Ubuntu kernel series?
Thanks,
KJ
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-1013-gcp 4.13.0-1013.17
ProcVersionSignature: Ubuntu 4.13.0-1013.17-gcp 4.13.16
Uname: Linux 4.13.0-1013-gcp x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Mon May 14 07:58:29 2018
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-gcp
UpgradeStatus: No upgrade log present (probably fresh install)
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