syzbot

==================================================================
BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888107b41870 of 4 bytes by task 4848 on cpu 1:
 io_get_sqe io_uring/io_uring.c:2276 [inline]
 io_submit_sqes+0x23f/0x1080 io_uring/io_uring.c:2327
 __do_sys_io_uring_enter io_uring/io_uring.c:3245 [inline]
 __se_sys_io_uring_enter+0x1c6/0x15a0 io_uring/io_uring.c:3182
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3182
 x64_sys_call+0x25ab/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107b41870 of 4 bytes by task 4847 on cpu 0:
 io_sqring_full io_uring/io_uring.h:285 [inline]
 io_uring_poll+0xcf/0x190 io_uring/io_uring.c:2739
 vfs_poll include/linux/poll.h:84 [inline]
 __io_arm_poll_handler+0x229/0xf30 io_uring/poll.c:622
 io_arm_poll_handler+0x411/0x5d0 io_uring/poll.c:756
 io_queue_async+0x89/0x320 io_uring/io_uring.c:1943
 io_queue_sqe io_uring/io_uring.c:1972 [inline]
 io_req_task_submit+0xb3/0xc0 io_uring/io_uring.c:1385
 io_handle_tw_list+0x1b9/0x200 io_uring/io_uring.c:1083
 tctx_task_work_run+0x6c/0x1b0 io_uring/io_uring.c:1155
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1173
 task_work_run+0x13a/0x1a0 kernel/task_work.c:180
 get_signal+0xeee/0x1080 kernel/signal.c:2681
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000003b7 -> 0x000003d5