R10: 0000000020000100 R11: 0000000000000206 R12: 0000000020005000 R13: 0000000020003000 R14: 0000000020000140 R15: 0000000020000100 ------------[ cut here ]------------ percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free! WARNING: CPU: 0 PID: 8920 at lib/percpu-refcount.c:382 percpu_ref_kill_and_confirm+0x169/0x1d0 lib/percpu-refcount.c:382 Modules linked in: CPU: 0 PID: 8920 Comm: syz-executor.2 Not tainted 5.10.0-next-20201218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:percpu_ref_kill_and_confirm+0x169/0x1d0 lib/percpu-refcount.c:382 Code: 5d 08 48 8d 7b 08 48 89 fa 48 c1 ea 03 80 3c 02 00 75 68 48 8b 53 08 48 c7 c6 e0 54 bf 89 48 c7 c7 00 54 bf 89 e8 15 ed 09 05 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 RSP: 0018:ffffc9001693fe10 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff888013b74a80 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815b95f5 RDI: fffff52002d27fb4 RBP: ffff88802fde4000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815b7a4b R11: 0000000000000000 R12: 0000000000000212 R13: 0000000000000000 R14: 0000000000000002 R15: ffff88805474bd60 FS: 00007f3806e01700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052e7cc CR3: 0000000046283000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: percpu_ref_kill include/linux/percpu-refcount.h:149 [inline] io_ring_ctx_wait_and_kill+0x31/0x560 fs/io_uring.c:8645 io_uring_release+0x3e/0x50 fs/io_uring.c:8685 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e149 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3806e00be8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: fffffffffffffff4 RBX: 0000000020000080 RCX: 000000000045e149 RDX: 0000000020005000 RSI: 0000000020000080 RDI: 0000000000004dea RBP: 00007f3806e00ca0 R08: 0000000020000140 R09: 0000000020000140 R10: 0000000020000100 R11: 0000000000000206 R12: 0000000020005000 R13: 0000000020003000 R14: 0000000020000140 R15: 0000000020000100