Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe-6.5 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2063495
Title:
Kernel soft lockup occures in `fib6_select_path` function
Status in linux-signed-hwe-6.5 package in Ubuntu:
Confirmed
Bug description:
We operate a Linux-based cluster of edge routers within a highly
dynamic setting where BGP-advertised routes constantly evolve due to
new next hop destinations frequently appearing and disappearing. In
areas experiencing significant IPv6 traffic, we periodically face
kernel soft lockups. Upon investigation, these lockups seem to occur
during the traversal of the multipath circular linked-list, for
finding the optimal path, in the fib6_select_path function,
specifically while iterating through the siblings in the multipath
linked-list. The problem typically arises when the linked list is
unexpectedly deleted (its list-head reference count equals zero),
leading to an infinite loop. This results in a soft lockup that
triggers a system panic due to the watchdog timer.
It's worth noting that this is a longstanding issue we've been dealing
with for about a year. Despite switching between different kernel
versions, the problem persists.
Attached please find the `.crash` report generated by `apport-cli`.
Thanks,
Omid
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.5.0-26-generic 6.5.0-26.26~22.04.1
ProcVersionSignature: Ubuntu 6.5.0-26.26~22.04.1-generic 6.5.13
Uname: Linux 6.5.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Tue Apr 23 00:00:14 2024
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-hwe-6.5
UpgradeStatus: No upgrade log present (probably fresh install)
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