INFO: task syz-executor:16961 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:18856 pid:16961 tgid:16961 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: 0033:0x7f818298ff17
RSP: 002b:00007ffd1c5549d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f8182a11c05 RCX: 00007f818298ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd1c554a90
RBP: 00007ffd1c554a90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd1c555b20
R13: 00007f8182a11c05 R14: 0000000000071953 R15: 00007ffd1c555b60
 </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/5667:
 #0: ffff888107b340a0 (&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
5 locks held by kworker/1:8/12736:
 #0: ffff88801b7cf148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900065b7bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888136472998 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff8880303c9198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff8880303ca160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
1 lock held by syz-executor/16961:
 #0: ffff888031ede0e0 (&type->s_umount_key#118){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
2 locks held by syz.0.6844/24315:
 #0: ffffffff8f534688 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x331/0x710
 #1: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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: 23409 Comm: kworker/u8:4 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_softirqs_on+0x148/0x1c0
Code: 48 c7 c7 d0 ac 00 8e 4c 89 fe e8 f3 4c 61 03 eb c3 48 c7 c7 cb 33 ba 8d e8 f5 6a db 09 b8 ff ff ff ff 65 0f c1 05 98 b8 02 11 <83> f8 01 75 4d 65 48 8b 05 7b 78 02 11 48 3b 44 24 08 75 5b 48 83
RSP: 0018:ffffc900091378b0 EFLAGS: 00000057
RAX: 0000000000000001 RBX: ffff888109ef3980 RCX: ead9d0c033b22300
RDX: 0000000000000000 RSI: ffffffff8dba33cb RDI: ffffffff8be32600
RBP: ffffc90009137978 R08: ffffffff8fa34237 R09: 1ffffffff1f46846
R10: dffffc0000000000 R11: fffffbfff1f46847 R12: ffffffff8b469198
R13: dffffc0000000000 R14: ffffffff8b469198 R15: 1ffff92001226f1c
FS:  0000000000000000(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32916ff8 CR3: 0000000040aa4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __local_bh_enable_ip+0xe9/0x1c0
 batadv_nc_purge_paths+0x318/0x3b0
 batadv_nc_worker+0x369/0x610
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
vkms_vblank_simulate: vblank timer overrun
