syzbot

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BUG: KCSAN: data-race in __set_task_comm / strlen

read to 0xffff8881048a2858 of 1 bytes by task 23464 on cpu 0:
 strlen+0x19/0x40 lib/string.c:420
 __fortify_strlen include/linux/fortify-string.h:266 [inline]
 trace_event_get_offsets_sched_stat_runtime include/trace/events/sched.h:553 [inline]
 do_perf_trace_sched_stat_runtime include/trace/events/sched.h:553 [inline]
 perf_trace_sched_stat_runtime+0x4f/0x170 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+0x133/0x160 kernel/sched/fair.c:1195
 update_curr+0x2c/0x140 kernel/sched/fair.c:1245
 dequeue_entity kernel/sched/fair.c:5346 [inline]
 dequeue_entities+0xb0/0x9b0 kernel/sched/fair.c:7020
 dequeue_task_fair+0xa9/0x1a0 kernel/sched/fair.c:7119
 detach_task+0x3f/0x90 kernel/sched/fair.c:9537
 detach_tasks kernel/sched/fair.c:9673 [inline]
 sched_balance_rq+0x179d/0x1e70 kernel/sched/fair.c:11875
 sched_balance_newidle kernel/sched/fair.c:12940 [inline]
 pick_next_task_fair+0x2d3/0x710 kernel/sched/fair.c:8971
 __pick_next_task kernel/sched/core.c:5926 [inline]
 pick_next_task kernel/sched/core.c:6465 [inline]
 __schedule+0x345/0xd40 kernel/sched/core.c:6848
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x5e/0xd0 kernel/sched/core.c:7004
 do_nanosleep+0x95/0x330 kernel/time/hrtimer.c:2124
 hrtimer_nanosleep+0x207/0x3e0 kernel/time/hrtimer.c:2171
 common_nsleep+0x62/0x80 kernel/time/posix-timers.c:1345
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1391 [inline]
 __se_sys_clock_nanosleep+0x223/0x260 kernel/time/posix-timers.c:1368
 __x64_sys_clock_nanosleep+0x55/0x70 kernel/time/posix-timers.c:1368
 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff8881048a2858 of 11 bytes by task 23482 on cpu 1:
 __set_task_comm+0x4d/0x150 fs/exec.c:1080
 __do_sys_prctl kernel/sys.c:2607 [inline]
 __se_sys_prctl+0xd3d/0x13f0 kernel/sys.c:2533
 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2533
 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23482 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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