Public bug reported:
running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent
5.4.0-25-generic kernel to lock up with no information on the console
showing where it is locked up.
Bisected this back to:
commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad)
Author: Joerg Roedel <jroe...@suse.de>
Date: Sat Mar 21 18:22:41 2020 -0700
x86/mm: split vmalloc_sync_all()
BugLink: https://bugs.launchpad.net/bugs/1869061
commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream.
** Affects: linux (Ubuntu)
Importance: Critical
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1875941
Title:
using perf as root locks up focal kernel
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