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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff888104b5bba0 of 8 bytes by task 5905 on cpu 1:
 __set_task_comm+0x92/0x180 fs/exec.c:1100
 begin_new_exec+0xeb4/0x1210 fs/exec.c:1257
 load_elf_binary+0x64a/0x1a30 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1694 [inline]
 exec_binprm fs/exec.c:1726 [inline]
 bprm_execve+0x45c/0x9b0 fs/exec.c:1778
 kernel_execve+0x5e0/0x630 fs/exec.c:1922
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:109
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888104b5bba3 of 1 bytes by task 5873 on cpu 0:
 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
 dequeue_entity kernel/sched/fair.c:6239 [inline]
 dequeue_entities+0xb6/0xca0 kernel/sched/fair.c:7951
 dequeue_task_fair+0x4a/0xb0 kernel/sched/fair.c:8046
 detach_task+0x37/0x80 kernel/sched/fair.c:10852
 detach_tasks kernel/sched/fair.c:10992 [inline]
 sched_balance_rq+0x1a34/0x20a0 kernel/sched/fair.c:13349
 sched_balance_newidle kernel/sched/fair.c:14433 [inline]
 pick_task_fair+0x2a7/0x4b0 kernel/sched/fair.c:9948
 __pick_next_task kernel/sched/core.c:6144 [inline]
 pick_next_task kernel/sched/core.c:6674 [inline]
 __schedule+0x37b/0xd10 kernel/sched/core.c:7149
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x5a/0xa0 kernel/sched/core.c:7326
 do_nanosleep+0xc5/0x360 kernel/time/hrtimer.c:2399
 hrtimer_nanosleep+0xf2/0x290 kernel/time/hrtimer.c:2445
 common_nsleep+0x62/0x80 kernel/time/posix-timers.c:1360
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1406 [inline]
 __se_sys_clock_nanosleep+0x223/0x260 kernel/time/posix-timers.c:1383
 __x64_sys_clock_nanosleep+0x55/0x70 kernel/time/posix-timers.c:1383
 x64_sys_call+0x146e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:231
 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: 0x32 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5873 Comm: syz.3.9496 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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