syzbot

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BUG: KCSAN: data-race in pollwake / pollwake

write to 0xffffc900014bf9d0 of 4 bytes by task 3675 on cpu 0:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xc1/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 anon_pipe_write+0x9df/0xb10 fs/pipe.c:595
 io_write+0x527/0xc90 io_uring/rw.c:1103
 __io_issue_sqe io_uring/io_uring.c:1737 [inline]
 io_issue_sqe+0x15f/0xb40 io_uring/io_uring.c:1756
 io_queue_sqe io_uring/io_uring.c:1975 [inline]
 io_submit_sqe io_uring/io_uring.c:2231 [inline]
 io_submit_sqes+0x67f/0x1050 io_uring/io_uring.c:2348
 __do_sys_io_uring_enter io_uring/io_uring.c:3400 [inline]
 __se_sys_io_uring_enter+0x1dc/0x1b50 io_uring/io_uring.c:3334
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3334
 x64_sys_call+0x26cb/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffffc900014bf9d0 of 4 bytes by task 3687 on cpu 1:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xc1/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 anon_pipe_write+0x9df/0xb10 fs/pipe.c:595
 io_write+0x527/0xc90 io_uring/rw.c:1103
 __io_issue_sqe io_uring/io_uring.c:1737 [inline]
 io_issue_sqe+0x15f/0xb40 io_uring/io_uring.c:1756
 io_queue_sqe io_uring/io_uring.c:1975 [inline]
 io_submit_sqe io_uring/io_uring.c:2231 [inline]
 io_submit_sqes+0x67f/0x1050 io_uring/io_uring.c:2348
 __do_sys_io_uring_enter io_uring/io_uring.c:3400 [inline]
 __se_sys_io_uring_enter+0x1dc/0x1b50 io_uring/io_uring.c:3334
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3334
 x64_sys_call+0x26cb/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3687 Comm: syz.7.11257 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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