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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff8881047accd8 of 8 bytes by task 9274 on cpu 1:
 __set_task_comm+0x78/0x180 fs/exec.c:1103
 begin_new_exec+0xee8/0x12b0 fs/exec.c:1297
 load_elf_binary+0x5e2/0x18f0 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1779 [inline]
 exec_binprm fs/exec.c:1811 [inline]
 bprm_execve+0x46b/0xa50 fs/exec.c:1867
 kernel_execve+0x5e0/0x630 fs/exec.c:2011
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:107
 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 0xffff8881047accd8 of 1 bytes by task 9271 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:1425
 update_curr+0x1e/0x210 kernel/sched/fair.c:2239
 update_curr_eevdf kernel/sched/fair.c:8196 [inline]
 enqueue_task_fair+0x77/0x850 kernel/sched/fair.c:8226
 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
 swake_up_locked kernel/sched/swait.c:30 [inline]
 swake_up_one+0x31/0x70 kernel/sched/swait.c:53
 rcu_gp_kthread_wake kernel/rcu/tree.c:1124 [inline]
 rcu_report_qs_rsp kernel/rcu/tree.c:2355 [inline]
 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2459 [inline]
 rcu_preempt_deferred_qs_irqrestore+0x56a/0x5a0 kernel/rcu/tree_plugin.h:571
 rcu_read_unlock_special+0xa0/0x210 kernel/rcu/tree_plugin.h:798
 __rcu_read_unlock+0x6b/0x70 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:882 [inline]
 pte_unmap include/linux/pgtable.h:117 [inline]
 wp_page_copy mm/memory.c:-1 [inline]
 do_wp_page+0x13b2/0x1ed0 mm/memory.c:4472
 handle_pte_fault mm/memory.c:6582 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0xe29/0x3bb0 mm/memory.c:6876
 do_user_addr_fault+0x636/0x1060 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: 0x6b -> 0x6d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9271 Comm: modprobe Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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