syzbot

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BUG: KCSAN: data-race in ep_poll_callback / ep_try_send_events

write to 0xffff88811c1eb6e8 of 4 bytes by task 11257 on cpu 0:
 ep_send_events fs/eventpoll.c:1832 [inline]
 ep_try_send_events+0x4f2/0x710 fs/eventpoll.c:1905
 ep_poll fs/eventpoll.c:1970 [inline]
 do_epoll_wait+0x371/0x940 fs/eventpoll.c:2461
 do_epoll_pwait+0x54/0x150 fs/eventpoll.c:2491
 __do_sys_epoll_pwait fs/eventpoll.c:2504 [inline]
 __se_sys_epoll_pwait fs/eventpoll.c:2498 [inline]
 __x64_sys_epoll_pwait+0x17d/0x1b0 fs/eventpoll.c:2498
 x64_sys_call+0x153d/0x3000 arch/x86/include/generated/asm/syscalls_64.h:282
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811c1eb6e8 of 4 bytes by task 11258 on cpu 1:
 ep_poll_callback+0x4a7/0x580 fs/eventpoll.c:1332
 __wake_up_common kernel/sched/wait.c:108 [inline]
 __wake_up_common_lock kernel/sched/wait.c:125 [inline]
 __wake_up+0x66/0xb0 kernel/sched/wait.c:146
 do_notify_pidfd kernel/signal.c:2157 [inline]
 do_notify_parent+0x18c/0x560 kernel/signal.c:2185
 exit_notify kernel/exit.c:758 [inline]
 do_exit+0xbbc/0x1590 kernel/exit.c:983
 __do_sys_exit kernel/exit.c:1079 [inline]
 __se_sys_exit kernel/exit.c:1077 [inline]
 __x64_sys_exit+0x1f/0x20 kernel/exit.c:1077
 x64_sys_call+0x2fe7/0x3000 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xe000203b -> 0xe0000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 11258 Comm: syz.1.3379 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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