================================================================== BUG: KCSAN: data-race in __io_cqring_fill_event / io_req_defer write to 0xffff888107554440 of 4 bytes by task 30873 on cpu 1: io_get_cqring fs/io_uring.c:1372 [inline] __io_cqring_fill_event+0x135/0x440 fs/io_uring.c:1511 io_req_complete_post+0x49/0x580 fs/io_uring.c:1551 io_issue_sqe+0x25ae/0x5650 fs/io_uring.c:1106 io_wq_submit_work+0x22d/0x440 fs/io_uring.c:6190 io_worker_handle_work+0x714/0xee0 fs/io-wq.c:450 io_wqe_worker+0x1ea/0x580 fs/io-wq.c:500 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888107554440 of 4 bytes by task 30869 on cpu 0: req_need_defer fs/io_uring.c:1185 [inline] io_req_defer+0x2f5/0x470 fs/io_uring.c:5951 io_queue_sqe+0x18/0x160 fs/io_uring.c:6358 io_submit_sqe+0x15a8/0x3140 fs/io_uring.c:6543 io_submit_sqes+0x609/0xab0 fs/io_uring.c:6657 __do_sys_io_uring_enter fs/io_uring.c:9203 [inline] __se_sys_io_uring_enter+0x21f/0xb10 fs/io_uring.c:9145 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9145 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 30869 Comm: syz-executor.5 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================