INFO: task syz-executor:5851 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:18856 pid:5851  tgid:5851  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: 0033:0x7ff7ba58ff17
RSP: 002b:00007ffee6bcd928 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff7ba611c05 RCX: 00007ff7ba58ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffee6bcd9e0
RBP: 00007ffee6bcd9e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffee6bcea70
R13: 00007ff7ba611c05 R14: 0000000000014134 R15: 00007ffee6bceab0
 </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
5 locks held by kworker/1:1/47:
2 locks held by getty/5678:
 #0: ffff88802272d0a0 (&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/5851:
 #0: ffff8881188b20e0 (&type->s_umount_key#77){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.3.260/6713:
 #0: ffff8881188b20e0 (&type->s_umount_key#77){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
3 locks held by syz.5.1524/10253:
1 lock held by syz.4.1527/10258:
 #0: ffff88802919d7e0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0
2 locks held by syz.4.1527/10259:
 #0: ffff88802919d7e0 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x14c/0x2d0
 #1: ffffffff8e1fe3e8 (lock#3){+.+.}-{4:4}, at: __lru_add_drain_all+0x66/0x5e0

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

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: 10253 Comm: syz.5.1524 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:lock_release+0x7/0x3e0
Code: 8b 3c 24 e9 08 fa ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 30 49 89 f5 49 89 fe 65 48 8b 05 60
RSP: 0018:ffffc90002a6f858 EFLAGS: 00000286
RAX: ffffffff82010481 RBX: ffff888118840d10 RCX: 0000000000080000
RDX: ffffc90029603000 RSI: ffffffff8201048b RDI: ffff888118840d28
RBP: ffffc90002a6f9d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200054df00 R12: ffff888118840ec0
R13: ffffea000485a600 R14: 0000000000002cb4 R15: ffff8881188411c0
FS:  00007fb83fbcd6c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb83c9ff000 CR3: 000000011dc2c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_unlock+0x16/0x50
 shmem_alloc_and_add_folio+0xcab/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb83ed8d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fb83fbccdf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000008000000 RCX: 00007fb83ed8d69f
RDX: 0000000008000000 RSI: 00007fb834a00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000002044c
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fb83fbccef0 R14: 00007fb83fbcceb0 R15: 00007fb834a00000
 </TASK>
