INFO: task syz.4.710:13693 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.710       state:D stack:26088 pid:13693 tgid:13672 ppid:13219  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write_nested+0x1b5/0x200
 filename_create+0x1f8/0x3c0
 do_mknodat+0x184/0x4d0
 __x64_sys_mknodat+0xa7/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd1d38ebe9
RSP: 002b:00007fbd1e193038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007fbd1d5b6090 RCX: 00007fbd1d38ebe9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fbd1d411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbd1d5b6128 R14: 00007fbd1d5b6090 R15: 00007fff7a1ea318
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
 #0: ffff888108af7148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900000f7bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0
6 locks held by kworker/u8:1/13:
 #0: ffff88801b2f7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90000107bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52b9f0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: wiphy_unregister+0x244/0xae0
 #4: ffff888024c78768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: wiphy_unregister+0x24e/0xae0
 #5: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u9:5/3609:
 #0: ffff8881012a6948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000648fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88801c3440e0 (&type->s_umount_key#105){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff88803c5de730 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
1 lock held by dhcpcd/5591:
 #0: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70
2 locks held by getty/5673:
 #0: ffff888020a7f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/11189:
4 locks held by syz.4.710/13673:
2 locks held by syz.4.710/13693:
 #0: ffff88801c344428 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88803c5deae0 (&type->i_mutex_dir_key#23/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0
1 lock held by syz.1.931/15381:
 #0: ffff88803e7920e0 (&type->s_umount_key#72){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/16238:
 #0: ffffffff8fa3d368 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70

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

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+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 13673 Comm: syz.4.710 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:__sanitizer_cov_trace_pc+0x37/0x70
Code: 08 50 a0 92 65 8b 15 88 a4 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c
RSP: 0018:ffffc900034df6a0 EFLAGS: 00000246
RAX: ffffffff833ff066 RBX: 0000000000000004 RCX: ffff8880296c0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000ff
RBP: ffff88803a445000 R08: 00000000000001ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff11007488a00 R14: 0000000000000000 R15: 1ffff11007488a02
FS:  00007fbd1e1b46c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003b1b6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dtSplitRoot+0x7a6/0x16c0
 dtInsert+0xef8/0x5f40
 jfs_symlink+0x715/0xe60
 vfs_symlink+0x143/0x2f0
 do_symlinkat+0x1b1/0x3f0
 __x64_sys_symlink+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd1d38ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbd1e1b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007fbd1d5b5fa0 RCX: 00007fbd1d38ebe9
RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 000020000000a900
RBP: 00007fbd1d411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbd1d5b6038 R14: 00007fbd1d5b5fa0 R15: 00007fff7a1ea318
 </TASK>
