Having been poking at this in the background for a while I have some new
information.
Interestingly what tool chain is used to build the kernel appears to
affect the outcome, so this could either be a tool chain bug, or a
lingering kernel bug that has been masked by older versions of the tool
chain.
Added a task for gcc-15 to raise awareness and perhaps get some input
from the tool chain experts.
$ cat proc-version-good-1
Linux version 6.17.4-0-generic (root@nkbuild) (x86_64-linux-gnu-gcc (Ubuntu
13.3.0-6ubuntu2~24.04) 13.3.0, GNU ld (GNU Binutils for Ubuntu) 2.42) #0 SMP
PREEMPT_DYNAMIC Fri Nov 21 14:22:56 UTC 2025
$ cat proc-version-good-2
Linux version 6.17.4-0-generic (root@pkbuild) (x86_64-linux-gnu-gcc (Ubuntu
14.2.0-19ubuntu2) 14.2.0, GNU ld (GNU Binutils for Ubuntu) 2.44) #0 SMP
PREEMPT_DYNAMIC Fri Nov 21 17:18:26 UTC 2025
$ cat proc-version-bad-1
Linux version 6.17.4-0-generic (root@qkbuild) (x86_64-linux-gnu-gcc (Ubuntu
15.2.0-4ubuntu4) 15.2.0, GNU ld (GNU Binutils for Ubuntu) 2.45) #0 SMP
PREEMPT_DYNAMIC Fri Nov 21 15:11:09 UTC 2025
$ cat proc-version-bad-2
Linux version 6.17.4-0-generic (root@rkbuild) (x86_64-linux-gnu-gcc (Ubuntu
15.2.0-8ubuntu1) 15.2.0, GNU ld (GNU Binutils for Ubuntu) 2.45) #0 SMP
PREEMPT_DYNAMIC Fri Nov 21 14:31:56 UTC 2025
** Also affects: gcc-15 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2129580
Title:
[questing] kernel BUG at lib/string_helpers.c:1043!
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