INFO: task syz-executor:7201 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21224 pid:7201  tgid:7201  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 v9fs_evict_inode+0x170/0x320
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 shrink_dcache_for_umount+0xa0/0x170
 generic_shutdown_super+0x67/0x2c0
 kill_anon_super+0x3b/0x70
 v9fs_kill_super+0x4c/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f225278ff17
RSP: 002b:00007ffd3e04ee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2252811c05 RCX: 00007f225278ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd3e04ef10
RBP: 00007ffd3e04ef10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd3e04ffa0
R13: 00007f2252811c05 R14: 0000000000021173 R15: 00007ffd3e04ffe0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5672:
 #0: ffff888020ed70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900028b82f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
7 locks held by kworker/1:4/5899:
 #0: ffff88801a481948 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000470fbc0 (serio_event_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8efa1ea8 (serio_mutex){+.+.}-{4:4}, at: serio_handle_event+0x2f/0x8d0
 #3: ffff8881216182e8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff8881216181d8 (&serio->drv_mutex){+.+.}-{4:4}, at: serio_driver_probe+0x58/0xd0
 #5: ffffffff8efb1928 (psmouse_mutex){+.+.}-{4:4}, at: psmouse_connect+0x9a/0x14a0
 #6: ffff88811dfc5080 (&ps2dev->cmd_mutex){+.+.}-{4:4}, at: ps2_command+0x70/0xe0
1 lock held by syz-executor/7201:
 #0: ffff888039dc40e0 (&type->s_umount_key#103){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.7.2030/11139:
 #0: ffff888039dc40e0 (&type->s_umount_key#103){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.2352/11947:
 #0: ffffffff8efa1ea8 (serio_mutex){+.+.}-{4:4}, at: serio_unregister_port+0x2f/0x190

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12030 Comm: syz.2.2377 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:validate_chain+0x0/0x2140
Code: 44 89 e6 4c 89 ff 29 f5 0f 82 91 fe ff ff eb b3 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 55 41 54 53 48 81 ec e0 00 00 00 49 89 cf 65 48
RSP: 0000:ffffc90004e8fb50 EFLAGS: 00000086
RAX: ffffffff93497380 RBX: 0000000000000000 RCX: dccfe6a69997a60d
RDX: 0000000000000001 RSI: ffff88810791e130 RDI: ffff88810791d640
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff818ffa9a
R10: dffffc0000000000 R11: fffffbfff1f47207 R12: 000000000000003f
R13: ffff88810791e130 R14: ffff88810791e130 R15: dccfe6a69997a60d
FS:  000055558c90c500(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555748a9608 CR3: 000000010839a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock_nested+0x32/0x50
 raw_spin_rq_lock_nested+0x2a/0x140
 __schedule+0x36b/0x4cc0
 schedule+0x165/0x360
 irqentry_exit_to_user_mode+0x5d/0x120
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0033:0x7fa68324d9f3
Code: 00 00 00 0f 1f 40 00 41 89 fb 44 8d 56 04 4c 8d 0d 22 46 36 00 89 f0 4c 8d 05 19 26 36 00 89 c2 81 e2 ff 1f 00 00 49 8b 0c d1 <48> 39 f1 74 28 48 85 c9 74 29 45 38 1c 10 75 23 83 c0 01 44 39 d0
RSP: 002b:00007ffc40ccf348 EFLAGS: 00000202
RAX: 00000000822e45f8 RBX: 00007fa6840f5720 RCX: 0000000000000000
RDX: 00000000000005f8 RSI: ffffffff822e45f8 RDI: 0000000000000004
RBP: ffffffff822e45f8 R08: 00007fa6835b0000 R09: 00007fa6835b2000
R10: 00000000822e45fc R11: 0000000000000004 R12: 0000000000000004
R13: 0000000000000000 R14: ffffffff822e45f8 R15: 00000000000000e3
 </TASK>
