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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff888101c8bb9a of 14 bytes by task 11019 on cpu 0:
 __set_task_comm+0x92/0x180 fs/exec.c:1104
 begin_new_exec+0xec6/0x1200 fs/exec.c:1292
 load_elf_binary+0x5e2/0x18f0 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1777 [inline]
 exec_binprm fs/exec.c:1809 [inline]
 bprm_execve+0x46b/0xa50 fs/exec.c:1865
 do_execveat_common+0x7b5/0x8b0 fs/exec.c:1963
 __do_sys_execve fs/exec.c:2036 [inline]
 __se_sys_execve fs/exec.c:2030 [inline]
 __x64_sys_execve+0x5f/0x80 fs/exec.c:2030
 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 0xffff888101c8bba6 of 1 bytes by task 10514 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/0x3b0 kernel/sched/fair.c:1369
 update_curr+0x1e/0x210 kernel/sched/fair.c:2183
 update_curr_eevdf kernel/sched/fair.c:8151 [inline]
 __dequeue_task+0x5a/0x840 kernel/sched/fair.c:8305
 detach_task+0x37/0x80 kernel/sched/fair.c:11262
 detach_tasks kernel/sched/fair.c:11402 [inline]
 sched_balance_rq+0x1b60/0x2470 kernel/sched/fair.c:13806
 sched_balance_newidle kernel/sched/fair.c:14934 [inline]
 pick_task_fair+0x2d7/0x4e0 kernel/sched/fair.c:10303
 __pick_next_task kernel/sched/core.c:6223 [inline]
 pick_next_task kernel/sched/core.c:6775 [inline]
 __schedule+0x37d/0xd40 kernel/sched/core.c:7294
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x5b/0xa0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x11/0x20 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x527/0xf60 kernel/locking/mutex.c:821
 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1164
 mutex_lock+0x83/0x90 kernel/locking/mutex.c:319
 xt_find_table_lock+0x83/0x2c0 net/netfilter/x_tables.c:1336
 xt_request_find_table_lock+0x24/0xa0 net/netfilter/x_tables.c:1378
 get_info net/ipv4/netfilter/ip_tables.c:961 [inline]
 do_ipt_get_ctl+0x5ff/0xcb0 net/ipv4/netfilter/ip_tables.c:1660
 nf_getsockopt+0x190/0x1b0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x137/0x180 net/ipv4/ip_sockglue.c:1785
 tcp_getsockopt+0xad/0xe0 net/ipv4/tcp.c:4873
 sock_common_getsockopt+0x60/0x70 net/core/sock.c:4098
 do_sock_getsockopt+0x2ce/0x350 net/socket.c:2505
 __sys_getsockopt net/socket.c:2536 [inline]
 __do_sys_getsockopt net/socket.c:2543 [inline]
 __se_sys_getsockopt net/socket.c:2540 [inline]
 __x64_sys_getsockopt+0x11d/0x1a0 net/socket.c:2540
 x64_sys_call+0x1032/0x2550 arch/x86/include/generated/asm/syscalls_64.h:56
 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: 0x6b -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10514 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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