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BUG: KCSAN: data-race in __set_task_comm / strlen

write to 0xffff88810495ef60 of 8 bytes by task 6376 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 0xffff88810495ef60 of 1 bytes by task 6350 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_gp_kthread_wake kernel/rcu/tree.c:1125 [inline]
 rcu_report_qs_rsp kernel/rcu/tree.c:2350 [inline]
 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2454 [inline]
 rcu_preempt_deferred_qs_irqrestore+0x569/0x5a0 kernel/rcu/tree_plugin.h:571
 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]
 lruvec_unlock_irq include/linux/memcontrol.h:1530 [inline]
 evict_folios+0x1fcc/0x2d60 mm/vmscan.c:4829
 try_to_shrink_lruvec+0x74d/0x8b0 mm/vmscan.c:4983
 lru_gen_shrink_lruvec mm/vmscan.c:5128 [inline]
 shrink_lruvec+0x25e/0x1b60 mm/vmscan.c:5888
 shrink_node_memcgs mm/vmscan.c:6127 [inline]
 shrink_node+0x67c/0x1e30 mm/vmscan.c:6171
 shrink_zones mm/vmscan.c:6410 [inline]
 do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472
 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794
 mem_cgroup_resize_max+0x1cd/0x240 mm/memcontrol-v1.c:1522
 mem_cgroup_write+0x1ad/0x250 mm/memcontrol-v1.c:-1
 cgroup_file_write+0x197/0x350 kernel/cgroup/cgroup.c:4337
 kernfs_fop_write_iter+0x1d2/0x2e0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57d/0x990 fs/read_write.c:687
 ksys_write+0xdc/0x1a0 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:747
 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x75 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6350 Comm: syz.3.491 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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