==================================================================
BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff88812df6aa62 of 6 bytes by task 31134 on cpu 0:
 __set_task_comm+0x92/0x180 fs/exec.c:1100
 __do_sys_prctl kernel/sys.c:2608 [inline]
 __se_sys_prctl+0xcb3/0x13b0 kernel/sys.c:2534
 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534
 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88812df6aa62 of 1 bytes by task 31133 on cpu 1:
 strlen+0x19/0x40 lib/string.c:402
 __fortify_strlen include/linux/fortify-string.h:218 [inline]
 trace_event_get_offsets_sched_stat_runtime include/trace/events/sched.h:560 [inline]
 do_trace_event_raw_event_sched_stat_runtime include/trace/events/sched.h:553 [inline]
 trace_event_raw_event_sched_stat_runtime+0x59/0x140 include/trace/events/sched.h:553
 __do_trace_sched_stat_runtime include/trace/events/sched.h:576 [inline]
 trace_sched_stat_runtime include/trace/events/sched.h:576 [inline]
 update_se+0x153/0x460 kernel/sched/fair.c:1375
 update_curr+0x29/0x210 kernel/sched/fair.c:2001
 enqueue_entity kernel/sched/fair.c:6121 [inline]
 enqueue_task_fair+0x144/0xab0 kernel/sched/fair.c:7857
 enqueue_task kernel/sched/core.c:2184 [inline]
 activate_task kernel/sched/core.c:2224 [inline]
 ttwu_do_activate+0xa7/0x230 kernel/sched/core.c:3824
 ttwu_queue kernel/sched/core.c:4077 [inline]
 try_to_wake_up+0x44a/0x6c0 kernel/sched/core.c:4415
 wake_up_process kernel/sched/core.c:4547 [inline]
 wake_up_q+0x48/0x80 kernel/sched/core.c:1173
 futex_wake+0x376/0x400 kernel/futex/waitwake.c:225
 do_futex+0x3f8/0x460 kernel/futex/syscalls.c:138
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex+0x2f6/0x370 kernel/futex/syscalls.c:191
 __x64_sys_futex+0x78/0x90 kernel/futex/syscalls.c:191
 x64_sys_call+0x24ab/0x3020 arch/x86/include/generated/asm/syscalls_64.h:203
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x6f -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 31133 Comm: syz.0.9412 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
==================================================================