INFO: task syz.1.842:14398 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.842       state:D stack:24696 pid:14398 tgid:14377 ppid:14176  task_flags:0x400040 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
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe19059cdd9
RSP: 002b:00007fe1913a8028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe190816180 RCX: 00007fe19059cdd9
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: ffffffff80000400
RBP: 00007fe190632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000240 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe190816218 R14: 00007fe190816180 R15: 00007ffde14170c8
 </TASK>
INFO: task syz.3.861:14528 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.861       state:D stack:25464 pid:14528 tgid:14527 ppid:14171  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x883/0x1080
 down_write+0x1bc/0x200
 super_lock+0x289/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f714b99cdd9
RSP: 002b:00007f714c7e5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f714bc15fa0 RCX: 00007f714b99cdd9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffff80000301
RBP: 00007f714ba32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f714bc16038 R14: 00007f714bc15fa0 R15: 00007ffcfe7967b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5440:
 #0: ffff8881759a00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900028382e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/11518:
2 locks held by syz-executor/11597:
2 locks held by syz-executor/12479:
1 lock held by syz.1.842/14398:
 #0: ffff8881a1bc40d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.861/14528:
 #0: ffff8881178fe0d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.9.893/14994:
 #0: ffff8881178fe0d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.1062/16520:
 #0: ffff8881b9bb00d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.1103/16924:
 #0: ffff8881178fe0d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
4 locks held by syz.1.1116/16979:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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: 69 Comm: kworker/u10:1 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
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lock_release+0x67/0x3c0
Code: 0f a3 05 8c c7 8e 0e 73 0d e8 45 f7 08 00 84 c0 0f 84 94 02 00 00 83 3d 46 fa 8e 0e 00 0f 84 1c 02 00 00 65 8b 05 29 46 97 11 <85> c0 0f 85 0d 02 00 00 65 4c 8b 3d 71 00 97 11 41 83 bf 8c 0b 00
RSP: 0018:ffffc9000179f558 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88823c63ae40 RCX: 0000000080000003
RDX: 0000000000000001 RSI: ffffffff8c28aa40 RDI: ffffffff8c28aa00
RBP: ffffc9000179f7c8 R08: ffff88816a423b13 R09: 1ffff1102d484762
R10: dffffc0000000000 R11: ffffed102d484763 R12: ffff88816e089d80
R13: ffffffff8ba8a3b2 R14: ffff88823c63aea0 R15: 1ffff110478c773c
FS:  0000000000000000(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3da9ff000 CR3: 00000001a4c5a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x1787/0x5680
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 on_each_cpu_cond_mask+0x7a/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
