INFO: task syz-executor.4:17663 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27256 pid:17663 ppid: 8381 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 io_uring_cancel_files fs/io_uring.c:8714 [inline] io_uring_cancel_task_requests+0x1774/0x1a90 fs/io_uring.c:8754 __io_uring_files_cancel+0x102/0x320 fs/io_uring.c:8840 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x258/0x2340 kernel/exit.c:780 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 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+0xac/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x48/0x180 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f6ba775e188 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: fffffffffffffffc RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 00000000200007c0 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffea3f277cf R14: 00007f6ba775e300 R15: 0000000000022000 INFO: task syz-executor.4:17734 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28544 pid:17734 ppid: 8381 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 io_uring_cancel_files fs/io_uring.c:8714 [inline] io_uring_cancel_task_requests+0x1774/0x1a90 fs/io_uring.c:8754 __io_uring_files_cancel+0x102/0x320 fs/io_uring.c:8840 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x258/0x2340 kernel/exit.c:780 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 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+0xac/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x48/0x180 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f6ba771c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000056c0b8 RCX: 0000000000465f69 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056c0bc RBP: 000000000056c0b0 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c0bc R13: 00007ffea3f277cf R14: 00007f6ba771c300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1627: #0: ffffffff8c70f900 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 3 locks held by kworker/u4:5/3117: 1 lock held by in:imklog/8060: #0: ffff888011b825f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 2 locks held by agetty/8097: #0: ffff888021747098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:266 #1: ffffc9000109c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x659/0x1c00 drivers/tty/n_tty.c:2178 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1627 Comm: khungtaskd Not tainted 5.12.0-rc1-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+0x125/0x19e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 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: 4829 Comm: systemd-journal Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:40 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:75 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:107 [inline] RIP: 0010:lock_is_held_type+0x62/0x160 kernel/locking/lockdep.c:5545 Code: 85 d7 00 00 00 65 4c 8b 2c 25 80 ef 01 00 41 83 bd 8c 09 00 00 00 0f 85 c0 00 00 00 41 89 f6 49 89 ff 9c 8f 04 24 4c 8b 24 24 48 c7 c7 60 73 ae 89 e8 21 10 00 00 65 ff 05 ca 33 b2 76 41 83 RSP: 0018:ffffc900010cf968 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c70f860 RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1b6ae7e R10: fffffbfff1b6ae7e R11: 0000000000000000 R12: 0000000000000246 R13: ffff888011841bc0 R14: 00000000ffffffff R15: ffffffff8c70f860 FS: 00007fb9e1d818c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9df29b000 CR3: 0000000025e9a000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_is_held include/linux/lockdep.h:278 [inline] rcu_read_lock_sched_held+0x41/0xb0 kernel/rcu/update.c:125 trace_lock_release+0x61/0x140 include/trace/events/lock.h:58 lock_release+0x27/0x6b0 kernel/locking/lockdep.c:5521 dput+0x281/0x6f0 include/linux/rcupdate.h:710 __traverse_mounts fs/namei.c:1309 [inline] traverse_mounts+0x407/0x690 fs/namei.c:1354 handle_mounts fs/namei.c:1463 [inline] step_into+0x146/0x1e70 fs/namei.c:1769 walk_component+0x2b7/0x6b0 fs/namei.c:1945 link_path_walk+0x62f/0xcb0 fs/namei.c:2262 path_lookupat+0xab/0x9b0 fs/namei.c:2419 filename_lookup+0x1b0/0x5e0 fs/namei.c:2453 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x39d/0x890 fs/open.c:425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb9e103c9c7 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:00007ffd04a81cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffd04a84d00 RCX: 00007fb9e103c9c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000563666e5b9a3 RBP: 00007ffd04a81e20 R08: 0000563666e513e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000563667d728a0 R15: 00007ffd04a82310