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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff888129bfccd8 of 10 bytes by task 10078 on cpu 1:
 __set_task_comm+0x78/0x180 fs/exec.c:1102
 __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+0x2421/0x2550 arch/x86/include/generated/asm/syscalls_64.h:158
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888129bfccdf of 1 bytes by task 10072 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+0x5a/0x150 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:1416
 update_curr+0x1e/0x210 kernel/sched/fair.c:2040
 update_curr_eevdf kernel/sched/fair.c:7972 [inline]
 enqueue_task_fair+0x77/0x850 kernel/sched/fair.c:8002
 enqueue_task kernel/sched/core.c:2194 [inline]
 activate_task kernel/sched/core.c:2234 [inline]
 ttwu_do_activate+0xa7/0x230 kernel/sched/core.c:3834
 ttwu_queue kernel/sched/core.c:4087 [inline]
 try_to_wake_up+0x44f/0x6d0 kernel/sched/core.c:4425
 autoremove_wake_function+0x10/0x50 kernel/sched/wait.c:404
 __wake_up_common kernel/sched/wait.c:109 [inline]
 __wake_up_common_lock kernel/sched/wait.c:126 [inline]
 __wake_up_sync_key+0x52/0x80 kernel/sched/wait.c:193
 __unix_dgram_recvmsg+0x3a4/0x860 net/unix/af_unix.c:2615
 unix_dgram_recvmsg+0x7e/0x90 net/unix/af_unix.c:2689
 sock_recvmsg_nosec+0xc2/0xf0 net/socket.c:1151
 ____sys_recvmsg+0x26f/0x280 net/socket.c:2931
 ___sys_recvmsg+0x11f/0x3a0 net/socket.c:2975
 do_recvmmsg+0x1e5/0x560 net/socket.c:3070
 __sys_recvmmsg net/socket.c:3144 [inline]
 __do_sys_recvmmsg net/socket.c:3167 [inline]
 __se_sys_recvmmsg net/socket.c:3160 [inline]
 __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3160
 x64_sys_call+0x77f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x63 -> 0x34

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10072 Comm: syz.2.1459 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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