INFO: task syz.6.1627:15770 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1627      state:D stack:24744 pid:15770 tgid:15769 ppid:15296  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa34218f6c9
RSP: 002b:00007fa3403f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa3423e5fa0 RCX: 00007fa34218f6c9
RDX: 0000000000000000 RSI: 0000200000002080 RDI: ffffffff80000201
RBP: 00007fa342211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa3423e6038 R14: 00007fa3423e5fa0 R15: 00007fffe10b6008
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8df3d6e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by dhcpcd/5558:
 #0: ffffffff8f332490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8f2cc608 (rtnl_mutex){+.+.}-{4:4}, at: nl80211_pre_doit+0x5f/0x930
2 locks held by getty/5644:
 #0: ffff8881736780a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/1:5/6904:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000866fba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88811140f240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1f7/0x3b0
2 locks held by syz-executor/11606:
3 locks held by kworker/u8:4/15168:
 #0: ffff88810caf6948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004d57ba0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f2cc608 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0
1 lock held by syz.6.1627/15770:
 #0: ffff88811af2a0e0 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.6.1855/17900:
 #0: ffff88811af2a0e0 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz-executor/18265:
 #0: ffff888118d4c0e0 (&type->s_umount_key#94){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz-executor/19002:
 #0: ffffffff8f2cc608 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8e9/0x1c80
3 locks held by syz-executor/19049:
 #0: ffffffff8f2cc608 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8e9/0x1c80
 #1: ffff88811ac74d38 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: do_setlink+0x388/0x41c0
 #2: ffffffff8df43178 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
7 locks held by syz-executor/19072:
 #0: ffff888173d2a420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff8881735fbc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540
 #2: ffff88816ddcbd28 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540
 #3: ffffffff8eb63f88 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd1/0x360
 #4: ffff8881ae89d0e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x800
 #5: ffff8881ae89a250 (&devlink->lock_key#35){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8df43040 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570

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

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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 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: 11606 Comm: syz-executor 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:do_raw_spin_lock+0xdd/0x290
Code: 8b 0c 25 08 80 6e 92 48 89 4c 24 10 48 39 c8 0f 84 07 01 00 00 4c 8d 6b 08 4d 89 ef 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 07 84 c0 0f 85 58 01 00 00 41 8b 45 00 65 8b 0d 8f 89
RSP: 0018:ffffc900080af800 EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: ffff888120be4bf0 RCX: ffff88811f2d5700
RDX: 0000000000000000 RSI: ffffffff8d8f579b RDI: ffff888120be4bf0
RBP: ffffc900080af8b0 R08: 0000000000000000 R09: ffffffff84100d5a
R10: dffffc0000000000 R11: ffffed102417ca1c R12: ffff888120be4c00
R13: ffff888120be4bf8 R14: 1ffff1102417c980 R15: 1ffff1102417c97f
FS:  00005555789c5500(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcaec89ff4 CR3: 000000011901e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 f2fs_write_checkpoint+0xa9a/0x2440
 kill_f2fs_super+0x2cc/0x6d0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02c45909f7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc9434b958 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f02c4611d7d RCX: 00007f02c45909f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc9434ba10
RBP: 00007ffc9434ba10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc9434caa0
R13: 00007f02c4611d7d R14: 000000000004b802 R15: 00007ffc9434cae0
 </TASK>
hpet_rtc_timer_reinit: 14 callbacks suppressed
hpet: Lost 6 RTC interrupts
