INFO: task syz.1.1078:17297 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1078      state:D stack:25128 pid:17297 tgid:17296 ppid:17083  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b9018ebe9
RSP: 002b:00007f2b91068038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2b903c5fa0 RCX: 00007f2b9018ebe9
RDX: 0000000000000000 RSI: 0000200000000c80 RDI: ffffffff80000900
RBP: 00007f2b90211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b903c6038 R14: 00007f2b903c5fa0 R15: 00007ffe6ab12478
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u10:0/27:
 #0: ffff8881000e3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000060fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5671:
 #0: ffff88810f38a0a0 (&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
2 locks held by syz-executor/12832:
1 lock held by syz-executor/15780:
 #0: ffff88801bf820e0 (&type->s_umount_key#56){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.1.1078/17297:
 #0: ffff88810f0500e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.1262/18904:
 #0: ffff88810f0500e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/19048:
1 lock held by syz.5.1354/19973:
2 locks held by syz.2.1356/20005:

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

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: 19973 Comm: syz.5.1354 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+0x70/0x3e0
Code: e8 45 f1 08 00 84 c0 75 0d f6 05 b0 06 f0 0d 01 0f 84 ad 02 00 00 83 3d dd 52 06 0e 00 0f 84 44 02 00 00 65 8b 05 a0 51 03 11 <85> c0 0f 85 35 02 00 00 65 4c 8b 3c 25 08 80 a0 92 41 83 bf ec 0a
RSP: 0018:ffffc9000266f0f0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff903e2401 RCX: 429159c302923c00
RDX: ffffc9000266f201 RSI: ffffffff8be33860 RDI: ffffffff8be33820
RBP: dffffc0000000000 R08: ffffc9000266fbb0 R09: 0000000000000000
R10: ffffc9000266f278 R11: fffff520004cde51 R12: ffffc9000266fbc0
R13: ffffffff8172c195 R14: ffffffff8e139f20 R15: ffffffff8172c195
FS:  00007f9fb274f6c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2607bff000 CR3: 0000000133e60000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xdbd/0x1520
 folios_put_refs+0x559/0x640
 shmem_undo_range+0x49e/0x14b0
 shmem_evict_inode+0x272/0xa70
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 __fput+0x68e/0xa70
 fput_close_sync+0x119/0x200
 __x64_sys_close+0x7f/0x110
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9fb198d84a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007f9fb274ee00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f9fb198d84a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000010 R08: 0000000000000000 R09: 00000000000051a5
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000008
R13: 00007f9fb274eef0 R14: 00007f9fb274eeb0 R15: 00007f9fa7600000
 </TASK>
