INFO: task syz-executor:29266 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-08685-g260f6f4fda93 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21944 pid:29266 tgid:29266 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: 0033:0x7fe8f398fe97
RSP: 002b:00007ffcadea4728 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fe8f3a11bdd RCX: 00007fe8f398fe97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcadea47e0
RBP: 00007ffcadea47e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcadea5870
R13: 00007fe8f3a11bdd R14: 00000000000c233a R15: 00007ffcadea58b0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139de0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:1/47:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000075fbc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88803d830240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
2 locks held by getty/5650:
 #0: ffff888021c110a0 (&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
3 locks held by kworker/0:7/6372:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000363fbc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8e13f878 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by syz.0.7948/25718:
1 lock held by syz-executor/29266:
 #0: ffff8880327820e0 (&type->s_umount_key#80){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-08685-g260f6f4fda93 #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: 25718 Comm: syz.0.7948 Not tainted 6.16.0-syzkaller-08685-g260f6f4fda93 #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:lock_release+0x3a/0x3e0
Code: ec 30 49 89 f5 49 89 fe 65 48 8b 05 80 1b fd 10 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 83 1b fd 10 83 f8 08 0f 83 9a 02 00 00 <89> c0 48 0f a3 05 6c 1d 03 0e 73 16 e8 05 e1 08 00 84 c0 75 0d f6
RSP: 0018:ffffc90002f0f7a8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888109d10000
RDX: 0000000000000000 RSI: ffffffff822bd8ee RDI: ffffffff8e139de0
RBP: ffff88801c565c04 R08: ffff88801c565bc7 R09: 1ffff110038acb78
R10: dffffc0000000000 R11: ffffed10038acb79 R12: 000000000003c78d
R13: ffffffff822bd8ee R14: ffffffff8e139de0 R15: ffff88801c565c10
FS:  00007f833985e6c0(0000) GS:ffff8880b8679000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83396e7d60 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __update_page_owner_free_handle+0x452/0x470
 __reset_page_owner+0x85/0x1f0
 __free_frozen_pages+0xc71/0xe70
 vfree+0x25a/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83389c1425
Code: Unable to access opcode bytes at 0x7f83389c13fb.
RSP: 002b:00007f833985df80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f8338bb5fa0 RCX: 00007f83389c1425
RDX: 00007f833985dfc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8338a11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f8338bb5fa0 R15: 00007ffe8fad3518
 </TASK>
