** Changed in: linux (Ubuntu Xenial)
Status: Triaged => Fix Committed
** Changed in: linux (Ubuntu Cosmic)
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/1824687
Title:
4.4.0-145-generic Kernel Panic ip6_expire_frag_queue
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Status in linux source package in Disco:
Triaged
Bug description:
[SRU Justification]
== Impact ==
Since 05c0b86b96 "ipv6: frags: rewrite ip6_expire_frag_queue()" the
16.04/4.4 kernel crashes whenever that functions gets called (on busy
systems this can be every 3-4 hours). While this potentially affects
Cosmic and later, too, the fix differs on later kernels (Bionic is not
yet affected as it does not yet carry updates to the frags handling).
== Fix ==
For Xenial and Cosmic, the proposed fix would be additional changes to
ip6_expipre_frag_queue(), taken from follow-up changes to ip_expire().
For Disco, I would hold back because we have a backlog of stable patches
there and depending on what got backported to 5.0.y there would be a simpler
fix.
For current development kernels, one just needs to ensure that the following
upstream change is included: 47d3d7fdb10a "ip6: fix skb leak in
ip6frag_expire_frag_queue()".
== Testcase ==
Unfortunately this could not be re-created locally. But a test kernel
which had the proposed fix applied was showing good testing (see
comment #37 and #38).
== Risk of Regression ==
The modified function is only called in rare cases and the positive
testing in production would cover this. So I would consider it low.
---
Description: Ubuntu 16.04.6 LTS
Release: 16.04
After upgrading our server to this Kernel we experience frequent Kernel
panics (Attachment).
Every 3 hours.
Our machine has a throuput of about 600 Mbits/s
The Panics are around the area of ip6_expire_frag_queue.
__pskb_pull_tail
ip6_dst_lookup_tail
_decode_session6
__xfrm_decode_session
icmpv6_route_lookup
icmp6_send
It seems similar to Bug Report in Debian.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=922488
According to the bug finder of above bug it also occurred after using a
Kernel with the change of
rewrite ip6_expire_frag_queue()
Intermediate solution. We disabled IPv6 on this machine to avoid further
Panics.
Please let me know what information is missing. The ubuntu-bug linux was
send. And I hope it is attached to this report.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-145-generic 4.4.0-145.171
ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
Uname: Linux 4.4.0-145-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Sun Apr 14 11:40:11 2019
InstallationDate: Installed on 2018-03-18 (391 days ago)
InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64
(20180228)
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed
UpgradeStatus: Upgraded to xenial on 2018-10-21 (174 days ago)
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Apr 12 21:04 seq
crw-rw---- 1 root audio 116, 33 Apr 12 21:04 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.18
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:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/tor3--vg-swap_1
InstallationDate: Installed on 2018-03-18 (393 days ago)
InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64
(20180228)
IwConfig: Error: [Errno 2] No such file or directory
Lsusb:
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-145-generic
root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
RelatedPackageVersions:
linux-restricted-modules-4.4.0-145-generic N/A
linux-backports-modules-4.4.0-145-generic N/A
linux-firmware 1.157.21
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial xenial
Uname: Linux 4.4.0-145-generic x86_64
UpgradeStatus: Upgraded to xenial on 2018-10-21 (176 days ago)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 10/08/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.0c
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
dmi.board.vendor: Supermicro
dmi.board.version: 1.2
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1.0c:bd10/08/2012:svnSupermicro:pnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:pvr0123456789:rvnSupermicro:rnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:rvr1.2:cvnSupermicro:ct3:cvr0123456789:
dmi.product.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
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