syzbot

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BUG: KCSAN: data-race in io_wq_worker_running / io_wqe_activate_free_worker

write to 0xffff888124e55b44 of 4 bytes by task 30962 on cpu 0:
 io_wq_worker_running+0x60/0xa0 fs/io-wq.c:691
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1935
 io_wqe_worker+0x396/0x940 fs/io-wq.c:659
 ret_from_fork+0x1f/0x30

read to 0xffff888124e55b44 of 4 bytes by task 30946 on cpu 1:
 io_wqe_get_acct fs/io-wq.c:173 [inline]
 io_wqe_activate_free_worker+0xf8/0x2b0 fs/io-wq.c:272
 io_wqe_enqueue+0x2f0/0x500 fs/io-wq.c:940
 io_wq_enqueue+0x31/0x40 fs/io-wq.c:973
 io_queue_iowq+0x215/0x370 fs/io_uring.c:2037
 io_queue_sqe_fallback+0x84/0xe0 fs/io_uring.c:8741
 io_submit_sqe+0x3718/0x3ac0 fs/io_uring.c:8963
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9079
 __do_sys_io_uring_enter fs/io_uring.c:12008 [inline]
 __se_sys_io_uring_enter+0x2d9/0xdd0 fs/io_uring.c:11934
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x0000000d -> 0x0000000b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30946 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-10037-g7e284070abe5-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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