Hello, syzbot found the following issue on: HEAD commit: a050a6d2 Merge tag 'perf-tools-fixes-for-v5.13-2021-05-24'.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13205087d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=3bcc8a6b51ef8094 dashboard link: https://syzkaller.appspot.com/bug?extid=73554e2258b7b8bf0bbf compiler: Debian clang version 11.0.1-2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+73554e2258b7b8bf0bbf@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __io_uring_cancel / io_uring_try_cancel_requests write to 0xffff88811d8df330 of 8 bytes by task 3709 on cpu 1: io_uring_clean_tctx fs/io_uring.c:9042 [inline] __io_uring_cancel+0x261/0x3b0 fs/io_uring.c:9136 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x185/0x1560 kernel/exit.c:781 do_group_exit+0xce/0x1a0 kernel/exit.c:923 get_signal+0xfc3/0x1610 kernel/signal.c:2835 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88811d8df330 of 8 bytes by task 6412 on cpu 0: io_uring_try_cancel_iowq fs/io_uring.c:8911 [inline] io_uring_try_cancel_requests+0x1ce/0x8e0 fs/io_uring.c:8933 io_ring_exit_work+0x7c/0x1110 fs/io_uring.c:8736 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x1d0/0x1f0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6412 Comm: kworker/u4:9 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound io_ring_exit_work ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
