On Feb 10, 2026 / 11:44, Thomas Gleixner wrote:
> On Tue, Feb 10 2026 at 07:33, Shinichiro Kawasaki wrote:
[...]
> > [   65.768341] [   T1296] BUG: KASAN: slab-use-after-free in sched_mm_cid_exit+0x298/0x500
> 
> Can you please decode these symbols (file/line) so that we actually see
> which access is flagged by KASAN?

Sure, faddr2line points to the line the patch touched:

$ ./scripts/faddr2line vmlinux sched_mm_cid_exit+0x298/0x500
sched_mm_cid_exit+0x298/0x500:
arch_clear_bit at arch/x86/include/asm/bitops.h:79
(inlined by) clear_bit at include/asm-generic/bitops/instrumented-atomic.h:42
(inlined by) mm_drop_cid at kernel/sched/sched.h:3746
(inlined by) mm_drop_cid_on_cpu at kernel/sched/sched.h:3762
(inlined by) sched_mm_cid_exit at kernel/sched/core.c:10737

Quote from kernel/sched/core.c:
--------------------------------------------------------------------------------
 10735                                  * mm::mm_cid::lock. Drop it.                   |
 10736                                  */                                             |
 10737                                 mm_drop_cid_on_cpu(mm, this_cpu_ptr(mm->mm_cid.pcpu));
 10738                         }                                                       |
 10739                         mm_cid_fixup_cpus_to_tasks(mm);                         |
--------------------------------------------------------------------------------

> Also .config and compiler version would be helpful.

Please find the attached config file. Its first line records the compiler
version:

  CONFIG_CC_VERSION_TEXT="gcc (GCC) 15.1.1 20250425 (Red Hat 15.1.1-1)"

If I can provide any other clues, please let me know.