INFO: task syz.5.345:10310 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.345       state:D stack:25656 pid:10310 tgid:10309 ppid:10067  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x153c/0x4fe0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x516/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b3559acb9
RSP: 002b:00007f0b36521028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f0b35815fa0 RCX: 00007f0b3559acb9
RDX: 0000000000000000 RSI: 0000200000005bc0 RDI: ffffffff80000800
RBP: 00007f0b35608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b35816038 R14: 00007f0b35815fa0 R15: 00007ffced220a58
 </TASK>
INFO: task syz.5.345:10311 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.345       state:D stack:26376 pid:10311 tgid:10309 ppid:10067  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x153c/0x4fe0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x516/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b3559acb9
RSP: 002b:00007f0b36500028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f0b35816090 RCX: 00007f0b3559acb9
RDX: 0000000000000000 RSI: 0000200000005bc0 RDI: ffffffff80000800
RBP: 00007f0b35608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b35816128 R14: 00007f0b35816090 R15: 00007ffced220a58
 </TASK>
INFO: task syz.4.359:10543 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.359       state:D stack:26200 pid:10543 tgid:10542 ppid:10207  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x153c/0x4fe0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x382/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa27c59acb9
RSP: 002b:00007fa27d3fe028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa27c815fa0 RCX: 00007fa27c59acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fa27c608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa27c816038 R14: 00007fa27c815fa0 R15: 00007ffdc1737058
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e33f020 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5636:
 #0: ffff8881136fe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/7688:
1 lock held by syz.5.345/10310:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.345/10311:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.359/10543:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.517/12345:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.547/12778:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.547/12779:
 #0: ffff8881707ae0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by dhcpcd/12817:
 #0: ffff888178ff1908 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x89/0x250
 #1: ffffffff8e344638 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz-executor/13748:
4 locks held by syz.4.703/13966:
1 lock held by cmp/14007:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xe83/0xed0
 kthread+0x388/0x470
 ret_from_fork+0x51b/0xa40
 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: 13966 Comm: syz.4.703 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:trace_hardirqs_off+0x2f/0x40
Code: 48 8b 5c 24 08 48 89 df e8 0e e3 ae 09 65 8b 05 87 c3 f9 10 85 c0 74 07 5b c3 cc cc cc cc cc 65 c7 05 71 c3 f9 10 01 00 00 00 <48> 89 df 5b e9 b8 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc900041d77d8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff82314b67 RCX: 0000000000000046
RDX: 0000000000000003 RSI: ffffffff8d9c4cf5 RDI: ffffffff8be097e0
RBP: 0000000000000cc0 R08: ffffffff82332169 R09: ffffffff8e33f020
R10: dffffc0000000000 R11: fffff94000195001 R12: 0000000000000246
R13: 1ffffd4000195007 R14: ffffea0000ca8000 R15: ffffea0000ca8038
FS:  00007f25362a16c0(0000) GS:ffff88818e3f4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000a6f000 CR3: 00000001ba6a3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 memcg1_commit_charge+0x27/0x1b0
 charge_memcg+0x10b/0x180
 __mem_cgroup_charge+0x25/0x80
 shmem_alloc_and_add_folio+0x7d0/0xf80
 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+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f253539acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f25362a1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2535615fa0 RCX: 00007f253539acb9
RDX: 00000000ffffffaf RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f2535408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2535616038 R14: 00007f2535615fa0 R15: 00007fffbdec2758
 </TASK>
