INFO: task syz-executor:6566 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:21744 pid:6566  tgid:6566  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: 0033:0x7f071538ff57
RSP: 002b:00007fff8f283188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f0715411c2d RCX: 00007f071538ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff8f283240
RBP: 00007fff8f283240 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff8f2842d0
R13: 00007f0715411c2d R14: 0000000000020b4a R15: 00007fff8f284310
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by klogd/5286:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
2 locks held by getty/5678:
 #0: ffff88810f4d50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
6 locks held by kworker/1:4/5886:
 #0: ffff88801b7ebd48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900033efbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888022f25198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88810e0aa198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff888122b4d160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #5: ffff8881351380d0 (&d->usb_mutex){+.+.}-{4:4}, at: rtl28xxu_ctrl_msg+0x56/0x640
4 locks held by udevd/5966:
 #0: ffff888028c56b08 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff888025136888 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff88811ffe85a8 (kn->active#30){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff88810e0aa198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
1 lock held by syz-executor/6566:
 #0: ffff888125d600e0 (&type->s_umount_key#85){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0

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

NMI backtrace for cpu 1
CPU: 1 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+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9754 Comm: syz.5.853 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:__pte_offset_map_lock+0xb7/0x210
Code: 34 24 48 89 44 24 18 80 3c 0e 00 74 0c 48 c7 c7 78 a4 bd 8d e8 3a 26 13 00 4c 8b 3d ab 9f ad 0b 48 8b 6c 24 30 31 ff 48 89 ee <e8> 94 ad af ff 48 85 ed 41 0f 95 c5 48 89 ee 48 83 e6 01 41 0f 94
RSP: 0000:ffffc9000448fb88 EFLAGS: 00000246
RAX: ffff888022d49118 RBX: ffff888128f6f790 RCX: dffffc0000000000
RDX: 000ffffffffff000 RSI: 0000000022d49067 RDI: 0000000000000000
RBP: 0000000022d49067 R08: 0000000000000000 R09: ffffffff820ffe59
R10: ffffc9000448fd0c R11: fffff52000891faa R12: 1ffff110251edef2
R13: ffff888107136610 R14: ffffc9000448fd40 R15: ffffea0000000000
FS:  00007fd6262286c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd61e423000 CR3: 000000012b36c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __handle_mm_fault+0x2327/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fd625250ca6
Code: f0 72 6e 48 63 cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01
RSP: 002b:00007fd6262274a0 EFLAGS: 00010206
RAX: 0000000003423001 RBX: 00007fd626227540 RCX: 0000000000000045
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fd6262275e0
RBP: 0000000000000102 R08: 00007fd61b000000 R09: 0000000003423000
R10: 0000000000000000 R11: 00007fd626227550 R12: 0000000000000001
R13: 00007fd62542da20 R14: 0000000000000000 R15: 00007fd6262275e0
 </TASK>
