================================================================== BUG: KCSAN: data-race in __io_cqring_fill_event / io_uring_poll write to 0xffff88812c856c80 of 4 bytes by task 16010 on cpu 1: io_get_cqring fs/io_uring.c:1379 [inline] __io_cqring_fill_event+0xfd/0x350 fs/io_uring.c:1561 io_req_complete_post+0x58/0x540 fs/io_uring.c:1585 __io_req_complete fs/io_uring.c:1640 [inline] __io_complete_rw+0x3b5/0x470 fs/io_uring.c:2490 io_complete_rw+0x1b/0x20 fs/io_uring.c:2497 io_rw_done fs/io_uring.c:2731 [inline] kiocb_done+0x1b0/0x420 fs/io_uring.c:2755 io_read fs/io_uring.c:3336 [inline] io_issue_sqe+0x36c5/0x6750 fs/io_uring.c:6115 __io_queue_sqe+0xe9/0x360 fs/io_uring.c:6414 io_queue_sqe fs/io_uring.c:6463 [inline] io_submit_sqe+0x1887/0x3360 fs/io_uring.c:6626 io_submit_sqes+0x5bd/0xbd0 fs/io_uring.c:6734 __do_sys_io_uring_enter fs/io_uring.c:9331 [inline] __se_sys_io_uring_enter+0x1e1/0xa80 fs/io_uring.c:9273 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9273 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812c856c80 of 4 bytes by task 16018 on cpu 0: __io_cqring_events fs/io_uring.c:1363 [inline] io_cqring_events fs/io_uring.c:2201 [inline] io_uring_poll+0xcf/0x160 fs/io_uring.c:8663 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:869 [inline] do_poll fs/select.c:917 [inline] do_sys_poll+0x622/0xc40 fs/select.c:1011 __do_sys_ppoll fs/select.c:1117 [inline] __se_sys_ppoll+0x169/0x1b0 fs/select.c:1097 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000237b -> 0x00002386 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 16018 Comm: syz-executor.3 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================