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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff88810477bb98 of 8 bytes by task 13735 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 0xffff88810477bb9f of 1 bytes by task 3219 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_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_preempt_deferred_qs kernel/rcu/tree_plugin.h:647 [inline]
 rcu_note_context_switch+0x119/0x8b0 kernel/rcu/tree_plugin.h:356
 __schedule+0x97/0xd20 kernel/sched/core.c:7138
 preempt_schedule_notrace+0x31/0x50 kernel/sched/core.c:7556
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 class_preempt_notrace_destructor include/linux/preempt.h:497 [inline]
 trace_event_raw_event_kmem_cache_alloc+0x17d/0x190 include/trace/events/kmem.h:12
 __do_trace_kmem_cache_alloc include/trace/events/kmem.h:12 [inline]
 trace_kmem_cache_alloc include/trace/events/kmem.h:12 [inline]
 kmem_cache_alloc_noprof+0x32b/0x3f0 mm/slub.c:5012
 alloc_filename fs/namei.c:147 [inline]
 do_getname+0x2e/0x1c0 fs/namei.c:187
 getname_flags+0x1d/0x30 fs/namei.c:230
 class_filename_flags_constructor include/linux/fs.h:2586 [inline]
 do_sys_openat2+0x6c/0x130 fs/open.c:1416
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1434
 x64_sys_call+0x1f72/0x2550 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0x2f -> 0x65

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3219 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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