INFO: task syz-executor.2:10810 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26536 pid:10810 ppid: 8431 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 io_uring_cancel_files fs/io_uring.c:8699 [inline] io_uring_cancel_task_requests+0x9d9/0xc40 fs/io_uring.c:8730 __io_uring_files_cancel+0x110/0x1b0 fs/io_uring.c:8816 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 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+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007fbfb7bd4188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000302 RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000000 RSI: 0000000000000302 RDI: 0000000000000004 RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffea33af7f R14: 00007fbfb7bd4300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:1/25: 1 lock held by khungtaskd/1624: #0: ffffffff8bf71760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8108: #0: ffff888024734d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1624 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4825 Comm: systemd-journal Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:437 [inline] RIP: 0010:lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4166 [inline] RIP: 0010:lockdep_hardirqs_on_prepare+0x188/0x400 kernel/locking/lockdep.c:4117 Code: 01 00 00 8b 85 70 09 00 00 85 c0 0f 85 0f 01 00 00 48 c7 c7 e0 7e 6b 89 e8 55 db ab 07 b8 ff ff ff ff 65 0f c1 05 38 c5 a9 7e <83> f8 01 0f 85 ff 00 00 00 5b 5d c3 9c 58 f6 c4 02 0f 85 59 01 00 RSP: 0018:ffffc900018df9a0 EFLAGS: 00000057 RAX: 0000000000000001 RBX: ffff8880151e81c0 RCX: 1ffffffff1b8ac69 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880151e81c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8178c438 R11: 0000000000000000 R12: 0000000000000200 R13: ffff88801d9499a0 R14: 0000000000010000 R15: ffff88801d949990 FS: 00007f7d647a78c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7d61bda018 CR3: 0000000013621000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x5b/0x1c0 kernel/trace/trace_preemptirq.c:49 seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] __follow_mount_rcu fs/namei.c:1424 [inline] handle_mounts fs/namei.c:1455 [inline] step_into+0x13dc/0x1c80 fs/namei.c:1769 walk_component+0x171/0x6a0 fs/namei.c:1945 link_path_walk.part.0+0x712/0xc90 fs/namei.c:2266 link_path_walk fs/namei.c:2190 [inline] path_lookupat+0xb7/0x830 fs/namei.c:2419 filename_lookup+0x19f/0x560 fs/namei.c:2453 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x127/0x850 fs/open.c:425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7d63a629c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffcf66bab48 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffcf66bdb70 RCX: 00007f7d63a629c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000555da842e9a3 RBP: 00007ffcf66bac90 R08: 0000555da84243e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000555da95168c0 R15: 00007ffcf66bb180