INFO: task syz.9.1060:14961 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1060      state:D stack:24696 pid:14961 tgid:14960 ppid:11648  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f0fd9cdd9
RSP: 002b:00007f3f10c05028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3f10015fa0 RCX: 00007f3f0fd9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f3f0fe32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f10016038 R14: 00007f3f10015fa0 R15: 00007ffd24525aa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5642:
 #0: ffff8881101330a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/10791:
1 lock held by syz.9.1060/14961:
 #0: ffff8881b6eec0d8 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/16020:
 #0: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by syz.3.1288/16910:
 #0: ffff8881b6eec0d8 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.1328/17153:
 #0: ffff8881b6eec0d8 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.9.1444/18057:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 18057 Comm: syz.9.1444 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:check_preemption_disabled+0x2a/0xe0
Code: 55 41 57 41 56 53 65 8b 05 b7 6f 89 07 65 8b 0d ac 6f 89 07 f7 c1 ff ff ff 7f 74 0c 5b 41 5e 41 5f 5d e9 09 d5 02 00 cc 9c 59 <f7> c1 00 02 00 00 74 ea 65 4c 8b 3d 5e 6f 89 07 41 f6 47 2f 04 74
RSP: 0018:ffffc90007bff7e0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff8881026b4600 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8bdcc600 RDI: ffffffff8c2892e0
RBP: 1ffffd4000d62d18 R08: ffffffff903339f7 R09: 1ffffffff206673e
R10: dffffc0000000000 R11: fffffbfff206673f R12: ffff8881026b4600
R13: 0000000000000246 R14: ffffea0006b168c0 R15: 0000000000000001
FS:  00007f431a4a96c0(0000) GS:ffff8882a9225000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0c9bfcb0 CR3: 00000001b85ec000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 memcg1_commit_charge+0xd8/0x290
 __mem_cgroup_charge+0x11f/0x1e0
 shmem_alloc_and_add_folio+0x7cd/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f431955d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f431a4a8da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f431a4a96c0 RCX: 00007f431955d60e
RDX: 0000000000200000 RSI: 00007f430f200000 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00007f431a4a8ee0 R14: 00007f431a4a8ea0 R15: 00007f430f200000
 </TASK>
