Fixed in upstream commit:
commit 11f5efc3ab66284f7aaacc926e9351d658e2577b
Author: Steven Rostedt (VMware) <[email protected]>
Date: Wed May 6 10:36:18 2020 -0400
tracing: Add a vmalloc_sync_mappings() for safe measure
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https://bugs.launchpad.net/bugs/1875941
Title:
using perf can crash kernel with a stack overflow
Status in Linux:
Confirmed
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
New
Bug description:
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 <[email protected]>
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.
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