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BUG: KCSAN: data-race in __set_task_comm / strlen

read to 0xffff888101d32a58 of 1 bytes by task 2981 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+0x14f/0x3b0 kernel/sched/fair.c:1368
 update_curr+0x1e/0x210 kernel/sched/fair.c:2182
 update_curr_eevdf kernel/sched/fair.c:8150 [inline]
 enqueue_task_fair+0x77/0x850 kernel/sched/fair.c:8180
 enqueue_task kernel/sched/core.c:2197 [inline]
 activate_task kernel/sched/core.c:2237 [inline]
 ttwu_do_activate+0xa7/0x230 kernel/sched/core.c:3897
 ttwu_queue kernel/sched/core.c:4150 [inline]
 try_to_wake_up+0x3f1/0x660 kernel/sched/core.c:4488
 ep_autoremove_wake_function+0x2c/0xb0 fs/eventpoll.c:2212
 __wake_up_common kernel/sched/wait.c:108 [inline]
 __wake_up_common_lock kernel/sched/wait.c:125 [inline]
 __wake_up_sync_key kernel/sched/wait.c:188 [inline]
 __wake_up_sync+0x4f/0x80 kernel/sched/wait.c:212
 ep_poll_callback+0x42d/0x590 fs/eventpoll.c:1562
 __wake_up_common kernel/sched/wait.c:108 [inline]
 __wake_up_common_lock kernel/sched/wait.c:125 [inline]
 __wake_up_sync_key+0x52/0x80 kernel/sched/wait.c:188
 sock_def_readable+0x70/0x170 net/core/sock.c:3739
 __netlink_sendskb net/netlink/af_netlink.c:1280 [inline]
 netlink_sendskb+0xc1/0x150 net/netlink/af_netlink.c:1286
 netlink_unicast+0x36a/0x740 net/netlink/af_netlink.c:1378
 netlink_sendmsg+0x5ef/0x740 net/netlink/af_netlink.c:1920
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54a/0x590 net/socket.c:2715
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2804
 x64_sys_call+0x22ab/0x2550 arch/x86/include/generated/asm/syscalls_64.h:47
 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

write to 0xffff888101d32a58 of 10 bytes by task 21605 on cpu 1:
 __set_task_comm+0x78/0x180 fs/exec.c:1103
 __do_sys_prctl kernel/sys.c:2611 [inline]
 __se_sys_prctl+0xc97/0x13a0 kernel/sys.c:2537
 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2537
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 21605 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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