INFO: task syz.1.1456:15836 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1456      state:D stack:25624 pid:15836 tgid:15815 ppid:15278  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: 0033:0x7fa4d719cdd9
RSP: 002b:00007fa4d80a7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa4d7416090 RCX: 00007fa4d719cdd9
RDX: ffffffffffffffff RSI: 0000200000000040 RDI: ffffffff80000702
RBP: 00007fa4d7232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4d7416128 R14: 00007fa4d7416090 R15: 00007ffe586c1968
 </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/5641:
 #0: ffff888179dfd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by syz-executor/5745:
3 locks held by kworker/0:9/9867:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000432fc40 ((work_completion)(&(&devlink->rwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
3 locks held by syz-executor/10510:
2 locks held by syz-executor/11813:
2 locks held by syz-executor/12965:
1 lock held by syz-executor/14321:
2 locks held by dhcpcd/14990:
 #0: ffff88811beb7a40 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.1.1456/15836:
 #0: ffff8881b7be20d8 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.1590/17008:
 #0: ffff8881745860d8 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x289/0x3d0
2 locks held by syz.3.1730/18875:
 #0: ffff88811b224410 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff8881b7be20d8 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
7 locks held by syz-executor/19204:
3 locks held by cmp/19554:

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

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: 18217 Comm: kworker/u10:7 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 nsim_dev_trap_report_work
RIP: 0010:lock_release+0x11c/0x3c0
Code: 8d 1c ad 00 00 00 00 4c 01 eb 48 8d 6c dd 00 48 89 ef 4c 89 f6 e8 64 3c 14 0a 44 89 64 24 14 45 89 e5 85 c0 0f 84 d7 00 00 00 <48> 85 ed 0f 84 13 01 00 00 83 7d 24 00 0f 85 d6 01 00 00 8b 45 20
RSP: 0018:ffffc9000ab374b0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000014 RCX: 0000000080000001
RDX: ffffc9000ab37601 RSI: ffffffff8e95cce0 RDI: ffff8881b771e4b0
RBP: ffff8881b771e4b0 R08: ffffc9000ab37710 R09: 0000000000000000
R10: ffffc9000ab37638 R11: fffff52001566ec9 R12: 0000000000000004
R13: 0000000000000004 R14: ffffffff8e95cce0 R15: ffff8881b771d880
FS:  0000000000000000(0000) GS:ffff8882a9225000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555c2fb3d5b0 CR3: 0000000112f82000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x1bba/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x182/0x650
 nsim_dev_trap_report_work+0x7cf/0xb80
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
