INFO: task syz-executor:5852 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:21376 pid:5852  tgid:5852  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: 0033:0x7f46f098ff17
RSP: 002b:00007ffd76e8f198 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f46f0a11c05 RCX: 00007f46f098ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd76e8f250
RBP: 00007ffd76e8f250 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd76e902e0
R13: 00007f46f0a11c05 R14: 0000000000015ef6 R15: 00007ffd76e90320
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ea0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5674:
 #0: ffff888022fe10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz-executor/5852:
 #0: ffff8880328ea0e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
4 locks held by udevd/5859:
 #0: ffff88803054b8b8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff888121ba7488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x55/0x3c0
 #2: ffff8881271325a8 (kn->active#30){.+.+}-{0:0}, at: kernfs_seq_start+0x75/0x3c0
 #3: ffff88803d579198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by kworker/1:3/5877:
 #0: ffff888104b23148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900037efbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888023caf198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88803d579198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400

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

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+0x3fc/0x770
 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: 5858 Comm: udevd 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:unwind_next_frame+0x34e/0x2390
Code: 8f 0f 83 48 11 00 00 48 c7 c0 90 76 b1 8f 49 29 c5 48 c7 c6 d8 7b 2a 90 49 c1 fd 02 4a 8d 14 6d 00 00 00 00 4c 01 ea 48 01 d2 <48> 01 f2 48 bd 00 00 00 00 00 fc ff df 0f 84 37 01 00 00 4c 8d 62
RSP: 0018:ffffc9000363f378 EFLAGS: 00000246
RAX: ffffffff8fb6b5c0 RBX: ffffffff8fb6b5c4 RCX: ffffffff8fb6b5c8
RDX: 0000000000000000 RSI: ffffffff90325aa6 RDI: ffffffff8be332a0
RBP: ffffffff8fb6b5c8 R08: 0000000000000001 R09: ffffffff8172c195
R10: ffffc9000363f4f8 R11: fffff520006c7ea1 R12: ffffffff816999c3
R13: 0000000000000000 R14: ffffc9000363f4a8 R15: ffffffff8fb6b5c4
FS:  00007f8d45fcfc80(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b20ff8 CR3: 0000000110180000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 netlink_recvmsg+0x5b2/0xa30
 sock_recvmsg+0x22c/0x270
 ____sys_recvmsg+0x1c9/0x460
 ___sys_recvmsg+0x1b5/0x510
 __x64_sys_recvmsg+0x198/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d45b2491e
Code: ff 89 ef 48 89 04 24 e8 4f 57 f9 ff 48 8b 04 24 48 83 c4 30 5d c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 21 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 70 48 8b 15 db c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd4d53d838 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8d45b2491e
RDX: 0000000000000000 RSI: 00007ffd4d53d868 RDI: 000000000000000c
RBP: 00005603eb848240 R08: 0000000000000007 R09: 13be5a894958349b
R10: 00000000ffffffff R11: 0000000000000246 R12: 00005603eb848240
R13: 00007ffd4d53d928 R14: 0000000000000000 R15: 00005603e37c54df
 </TASK>
