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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff88810497bba0 of 8 bytes by task 5546 on cpu 0:
 __set_task_comm+0x92/0x180 fs/exec.c:1100
 begin_new_exec+0xeb4/0x1210 fs/exec.c:1257
 load_elf_binary+0x64a/0x1a30 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1694 [inline]
 exec_binprm fs/exec.c:1726 [inline]
 bprm_execve+0x45c/0x9b0 fs/exec.c:1778
 kernel_execve+0x5e0/0x630 fs/exec.c:1922
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:109
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88810497bba0 of 1 bytes by task 5543 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+0x59/0x140 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:1375
 update_curr+0x29/0x210 kernel/sched/fair.c:2001
 enqueue_entity kernel/sched/fair.c:6121 [inline]
 enqueue_task_fair+0x144/0xab0 kernel/sched/fair.c:7857
 enqueue_task kernel/sched/core.c:2184 [inline]
 activate_task kernel/sched/core.c:2224 [inline]
 ttwu_do_activate+0xa7/0x230 kernel/sched/core.c:3824
 ttwu_queue kernel/sched/core.c:4077 [inline]
 try_to_wake_up+0x44a/0x6c0 kernel/sched/core.c:4415
 swake_up_locked kernel/sched/swait.c:30 [inline]
 swake_up_one+0x31/0x70 kernel/sched/swait.c:53
 __rcu_report_exp_rnp+0x109/0x110 kernel/rcu/tree_exp.h:210
 rcu_report_exp_cpu_mult+0xcd/0x100 kernel/rcu/tree_exp.h:261
 rcu_report_exp_rdp kernel/rcu/tree_exp.h:275 [inline]
 rcu_preempt_deferred_qs_irqrestore+0x14c/0x5a0 kernel/rcu/tree_plugin.h:521
 rcu_read_unlock_special+0x9f/0x200 kernel/rcu/tree_plugin.h:772
 __rcu_read_unlock+0x6b/0x70 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 pte_unmap include/linux/pgtable.h:117 [inline]
 do_anonymous_page mm/memory.c:5383 [inline]
 do_pte_missing mm/memory.c:4564 [inline]
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x2d65/0x2da0 mm/memory.c:6686
 do_user_addr_fault+0x634/0x1060 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

value changed: 0x75 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5543 Comm: sed Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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