syzbot

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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff88813e41d310 of 4 bytes by task 9923 on cpu 0:
 io_get_cqe_overflow io_uring/io_uring.h:113 [inline]
 io_get_cqe io_uring/io_uring.h:125 [inline]
 __io_fill_cqe_req+0x6d/0x4d0 io_uring/io_uring.h:138
 io_fill_cqe_req io_uring/io_uring.h:166 [inline]
 __io_req_complete_post+0x67/0x7b0 io_uring/io_uring.c:933
 io_req_complete_post io_uring/io_uring.c:970 [inline]
 io_issue_sqe+0x319/0x660 io_uring/io_uring.c:1863
 io_wq_submit_work+0x1ef/0x340 io_uring/io_uring.c:1927
 io_worker_handle_work+0x532/0xaf0 io_uring/io-wq.c:587
 io_wqe_worker+0x1e9/0x770 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88813e41d310 of 4 bytes by task 9916 on cpu 1:
 __io_cqring_events io_uring/io_uring.c:178 [inline]
 io_cqring_events io_uring/io_uring.c:1498 [inline]
 io_uring_poll+0xcb/0x1a0 io_uring/io_uring.c:2793
 vfs_poll include/linux/poll.h:88 [inline]
 __io_arm_poll_handler+0x205/0xe30 io_uring/poll.c:598
 io_arm_poll_handler+0x472/0x5d0 io_uring/poll.c:722
 io_queue_async+0x85/0x4a0 io_uring/io_uring.c:2001
 io_queue_sqe io_uring/io_uring.c:2032 [inline]
 io_submit_sqe io_uring/io_uring.c:2284 [inline]
 io_submit_sqes+0xa44/0x1030 io_uring/io_uring.c:2395
 __do_sys_io_uring_enter io_uring/io_uring.c:3343 [inline]
 __se_sys_io_uring_enter+0x1e7/0x1680 io_uring/io_uring.c:3275
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00001be0 -> 0x00001bf9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9916 Comm: syz-executor.0 Not tainted 6.2.0-rc8-syzkaller-00002-gb408817d4884-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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