INFO: task syz.7.649:11097 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.649       state:D stack:25592 pid:11097 tgid:11096 ppid:10586  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16f9/0x5500
 rt_mutex_schedule+0x76/0xf0
 __rt_mutex_slowlock_locked+0x1f28/0x2550
 __rwbase_read_lock+0xc3/0x180
 down_read+0x132/0x200
 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: 0033:0x7f6d5f5ecdd9
RSP: 002b:00007f6d5d846028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f6d5f865fa0 RCX: 00007f6d5f5ecdd9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffff80000801
RBP: 00007f6d5f682d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000400 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d5f866038 R14: 00007f6d5f865fa0 R15: 00007ffd39865548
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/42:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:4/73:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc9000179fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by dhcpcd/5333:
 #0: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_deladdr+0x1c1/0x790
2 locks held by getty/5417:
 #0: ffff888173db70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90003f062e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0
6 locks held by kworker/u8:3/5650:
 #0: ffff8881012ad938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc9000593fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xe5/0x9e0
 #4: ffffffff8de5f380 (local_bh){.+.+}-{1:3}, at: unwind_next_frame+0xa6/0x2550
 #5: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x10c/0x2b0
5 locks held by syz-executor/6314:
 #0: ffff888179e1a0d0 (&type->s_umount_key#56){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff88810a464348 (&sbi->cp_global_sem_key){+.+.}-{4:4}, at: f2fs_write_checkpoint+0x2ed/0x26a0
 #2: ffff88810a465220 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: f2fs_write_checkpoint+0xb3b/0x26a0
 #3: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
 #4: ffff888116a89428 (&sb->s_type->i_lock_key#39){+.+.}-{3:3}, at: igrab+0x2d/0x1e0
5 locks held by syz-executor/10207:
 #0: ffff88811332a0d0 (&type->s_umount_key#56){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888115878348 (&sbi->cp_global_sem_key#2){+.+.}-{4:4}, at: f2fs_write_checkpoint+0x2ed/0x26a0
 #2: ffff888115879220 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: f2fs_write_checkpoint+0xb3b/0x26a0
 #3: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
 #4: ffff88818d281428 (&sb->s_type->i_lock_key#39){+.+.}-{3:3}, at: igrab+0x2d/0x1e0
1 lock held by syz.7.649/11097:
 #0: ffff888179e1a0d0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/11787:
 #0: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x41/0x1c0
7 locks held by syz-executor/11801:
 #0: ffff888174512480 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0
 #1: ffff88811c5ef878 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1df/0x540
 #2: ffff88816cedfe18 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x540
 #3: ffffffff8ebe8758 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x13c/0x710
 #4: ffff88823c428960 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffff88818d734310 (&devlink->lock_key#27){+.+.}-{4:4}, at: nsim_drv_probe+0xc9/0xc30
 #6: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x88/0x290
2 locks held by syz-executor/12066:
 #0: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x60
2 locks held by syz-executor/12076:
 #0: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x88/0x290
2 locks held by syz-executor/12089:
 #0: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x88/0x290

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 42 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(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: 10207 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_is_held_type+0x3f/0x150
Code: 86 57 62 04 00 0f 84 e4 00 00 00 65 8b 05 e9 cd 47 07 85 c0 0f 85 d5 00 00 00 65 4c 8b 2d 71 88 47 07 41 83 bd f4 0b 00 00 00 <0f> 85 bf 00 00 00 89 f5 49 89 fe 9c 41 5c fa 48 c7 c7 fb 01 64 8d
RSP: 0018:ffffc90005baf6f0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffff888172168000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8dfc8300
RBP: ffffc90005baf830 R08: ffffffff842f6deb R09: ffff888115879220
R10: dffffc0000000000 R11: ffffed1022b0f303 R12: ffff888172168000
R13: ffff888172168000 R14: ffff8881158791c8 R15: ffff8881721684c4
FS:  000055557aa26500(0000) GS:ffff8882a9f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005614231ef680 CR3: 000000016fee6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __might_resched+0x37/0x480
 rt_spin_lock+0xc2/0x400
 f2fs_write_checkpoint+0xb3b/0x26a0
 kill_f2fs_super+0x314/0x730
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6cb5ee017
Code: a2 c7 05 dc 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd8514be48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fd6cb682120 RCX: 00007fd6cb5ee017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd8514bf00
RBP: 00007ffd8514bf00 R08: 00007ffd8514cf00 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd8514cf90
R13: 00007fd6cb682120 R14: 00000000000aaf24 R15: 00007ffd8514cfd0
 </TASK>
