INFO: task syz.2.732:9236 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.732       state:D stack:25304 pid:9236  tgid:9229  ppid:8822   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 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: 0033:0x7fd71c59acb9
RSP: 002b:00007fd71d4b6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd71c815fa0 RCX: 00007fd71c59acb9
RDX: 0000000000000000 RSI: 0000200000002540 RDI: ffffffff80000800
RBP: 00007fd71c608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd71c816038 R14: 00007fd71c815fa0 R15: 00007ffd5af92db8
 </TASK>
INFO: task syz.0.804:9523 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.804       state:D stack:28728 pid:9523  tgid:9517  ppid:9055   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 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
 ksys_sync+0xa0/0x170
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d5f39acb9
RSP: 002b:00007f5d60274028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5d5f616090 RCX: 00007f5d5f39acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5d5f616090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d5f616128 R14: 00007f5d5f616090 R15: 00007ffe99236de8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:2/45:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000b57bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881b20a5240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
2 locks held by getty/5636:
 #0: ffff888112b360a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/5823:
1 lock held by syz.2.732/9236:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.804/9523:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.841/9840:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.930/10544:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.995/10989:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.1016/11034:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.1096/11665:
 #0: ffff888114fb80e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz-executor/12788:
 #0: ffffffff8f7a9ec8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
 #1: ffff888175e154e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420
 #2: ffffffff8e360c78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 5248 Comm: klogd 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: 0033:0x7f6b52261772
Code: 00 48 39 c3 75 18 45 85 e4 78 17 41 01 dc 71 12 48 8b 05 a9 a6 14 00 64 c7 00 4b 00 00 00 41 83 cc ff 44 89 e0 5a 5b 41 5c c3 <41> 56 55 48 63 e9 53 48 83 ec 10 85 ed 79 1f 48 8d 0d b8 4f 11 00
RSP: 002b:00007ffdd43512e8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000064 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 00007ffdd43517bf RDI: 000055a3b94c4910
RBP: 000055a3b94c4910 R08: 00007ffdd43517bf R09: 00007ffdd43513d8
R10: 000000000000020f R11: 0000000000000000 R12: 00007ffdd4351808
R13: 00007ffdd43517bf R14: 0000000000000000 R15: 0000000000000001
FS:  00007f6b5217d380 GS:  0000000000000000
