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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff888103d25e1b of 13 bytes by task 30630 on cpu 0:
 __set_task_comm+0x92/0x180 fs/exec.c:1103
 begin_new_exec+0xee8/0x12b0 fs/exec.c:1296
 load_elf_binary+0x5e2/0x18f0 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1778 [inline]
 exec_binprm fs/exec.c:1810 [inline]
 bprm_execve+0x46b/0xa50 fs/exec.c:1866
 do_execveat_common+0x7a4/0x8a0 fs/exec.c:1964
 __do_sys_execve fs/exec.c:2037 [inline]
 __se_sys_execve fs/exec.c:2031 [inline]
 __x64_sys_execve+0x5f/0x80 fs/exec.c:2031
 x64_sys_call+0x1cd2/0x2550 arch/x86/include/generated/asm/syscalls_64.h:60
 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 0xffff888103d25e21 of 1 bytes by task 30623 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+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/0x450 kernel/sched/fair.c:1425
 update_curr+0x1e/0x210 kernel/sched/fair.c:2048
 update_curr_eevdf kernel/sched/fair.c:7980 [inline]
 enqueue_task_fair+0x77/0x850 kernel/sched/fair.c:8010
 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:3847
 ttwu_queue kernel/sched/core.c:4100 [inline]
 try_to_wake_up+0x44f/0x6d0 kernel/sched/core.c:4438
 __mutex_unlock_slowpath+0x217/0x370 kernel/locking/mutex.c:1077
 mutex_unlock+0x81/0x90 kernel/locking/mutex.c:582
 synchronize_rcu_expedited+0x6ba/0x770 kernel/rcu/tree_exp.h:-1
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3411
 tcx_entry_sync include/net/tcx.h:53 [inline]
 tcx_link_release+0x20f/0x3b0 kernel/bpf/tcx.c:191
 tcx_link_detach+0x15/0x20 kernel/bpf/tcx.c:285
 link_detach+0x123/0x170 kernel/bpf/syscall.c:6001
 __sys_bpf+0x96c/0xc30 kernel/bpf/syscall.c:6464
 __do_sys_bpf kernel/bpf/syscall.c:6489 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6486 [inline]
 __x64_sys_bpf+0x69/0x80 kernel/bpf/syscall.c:6486
 x64_sys_call+0xf26/0x2550 arch/x86/include/generated/asm/syscalls_64.h:322
 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: 0x6e -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 30623 Comm: syz.0.7073 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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