INFO: task syz-executor:7846 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:21096 pid:7846  tgid:7846  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: 0033:0x7f9e8998ff17
RSP: 002b:00007fffa7bc1ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9e89a11c05 RCX: 00007f9e8998ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffa7bc1f80
RBP: 00007fffa7bc1f80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffa7bc3010
R13: 00007f9e89a11c05 R14: 0000000000025b3f R15: 00007fffa7bc3050
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff8880288f70a0 (&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/7846:
 #0: ffff888116a820e0 (&type->s_umount_key#68){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.3.749/8599:
 #0: ffff888116a820e0 (&type->s_umount_key#68){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/9370:
 #0: ffff8881163ac0e0 (&type->s_umount_key#82){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56e108 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz.8.1342/10881:
 #0: ffff88811189e0e0 (&type->s_umount_key#80/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
 #1: ffffffff8e56e108 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520

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

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: 10031 Comm: kworker/u9:9 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
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:lock_release+0x63/0x3e0
Code: 00 89 c0 48 0f a3 05 4c 1e 06 0e 73 16 e8 45 f1 08 00 84 c0 75 0d f6 05 2e 04 f0 0d 01 0f 84 ad 02 00 00 83 3d 5d 4f 06 0e 00 <0f> 84 44 02 00 00 65 8b 05 20 24 03 11 85 c0 0f 85 35 02 00 00 65
RSP: 0018:ffffc90003eff470 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90324001 RCX: b7c7292cd4562600
RDX: ffffc90003eff501 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: dffffc0000000000 R08: ffffc90003efff48 R09: 0000000000000000
R10: ffffc90003eff5f8 R11: fffff520007dfec1 R12: ffffc90003efff58
R13: ffffffff8172c195 R14: ffffffff8e139ee0 R15: ffffffff8172c195
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e406ff8 CR3: 000000010fcc8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/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
 nsim_dev_trap_report_work+0x7cf/0xb80
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
