INFO: task syz.7.680:9236 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.680       state:D stack:25864 pid:9236  tgid:9235  ppid:8510   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
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4970b8ebe9
RSP: 002b:00007f4971a06038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f4970dc5fa0 RCX: 00007f4970b8ebe9
RDX: 2200000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f4970c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4970dc6038 R14: 00007f4970dc5fa0 R15: 00007fff577396c8
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by khungtaskd/34:
 #0: ffffffff8e33cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5673:
 #0: ffff8880295ee0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900028fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/6919:
5 locks held by udevd/8327:
1 lock held by syz.7.680/9236:
 #0: ffff88802ffe40e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.706/9373:
 #0: ffff88802ffe40e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/9562:
 #0: ffffffff8ea92a28 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x44a/0x690
 #1: ffffffff8e342700 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
1 lock held by syz.0.1110/11531:
2 locks held by syz.8.1112/11535:
3 locks held by syz.8.1112/11536:

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

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+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x47f/0x820
 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: 11535 Comm: syz.8.1112 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:__sanitizer_cov_trace_pc+0x31/0x70
Code: 24 65 48 8b 0c 25 08 60 c2 92 65 8b 15 38 94 01 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c <8b> 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48
RSP: 0018:ffffc900029f7598 EFLAGS: 00000246
RAX: ffffffff81fc378a RBX: dffffc0000000000 RCX: ffff88803d14b980
RDX: 0000000000000000 RSI: 0000000000000016 RDI: 000000000000001f
RBP: ffffc900029f7690 R08: ffffea0004d9fe77 R09: 1ffffd40009b3fce
R10: dffffc0000000000 R11: fffff940009b3fcf R12: 0000000000000001
R13: ffffea0004765000 R14: 0000000000000016 R15: 0000000000000017
FS:  00007fb6b52026c0(0000) GS:ffff8881a39fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6aa9ff000 CR3: 000000001e942000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 folios_put_refs+0x17a/0x670
 folio_batch_move_lru+0x39b/0x420
 __folio_batch_add_and_move+0x51c/0xc60
 shmem_alloc_and_add_folio+0xcb3/0xf60
 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/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6b438d69f
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:00007fb6b5201df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fb6b438d69f
RDX: 0000000001000000 RSI: 00007fb6a9a00000 RDI: 0000000000000029
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000597f
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000029
R13: 00007fb6b5201ef0 R14: 00007fb6b5201eb0 R15: 00007fb6a9a00000
 </TASK>
