INFO: task syz.6.754:13402 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.754       state:D stack:28184 pid:13402 tgid:13354 ppid:11961  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 path_openat+0xb4c/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_creat+0x8f/0xc0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb6519c799
RSP: 002b:00007fbb65f8c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fbb65416090 RCX: 00007fbb6519c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000e00
RBP: 00007fbb65232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb65416128 R14: 00007fbb65416090 R15: 00007ffe521f2a78
 </TASK>
INFO: task syz.6.754:13404 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.754       state:D stack:28832 pid:13404 tgid:13354 ppid:11961  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 filename_symlinkat+0xf7/0x410
 __se_sys_symlinkat+0x4e/0x2b0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb6519c799
RSP: 002b:00007fbb633f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007fbb65416180 RCX: 00007fbb6519c799
RDX: 0000200000000240 RSI: ffffffffffffff9c RDI: 0000200000000140
RBP: 00007fbb65232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb65416218 R14: 00007fbb65416180 R15: 00007ffe521f2a78
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:2/33:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:5/1095:
 #0: ffff8881626f6948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006aafc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888172a640e0 (&type->s_umount_key#93){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881a58ab8b8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5635:
 #0: ffff888172be60a0 (&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
4 locks held by syz.6.754/13356:
2 locks held by syz.6.754/13402:
 #0: ffff888172a64420 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881a58abc68 (&type->i_mutex_dir_key#14){++++}-{4:4}, at: path_openat+0xb4c/0x3860
2 locks held by syz.6.754/13404:
 #0: ffff888172a64420 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881a58abc68 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
1 lock held by syz.6.939/15517:
 #0: ffff888172a640e0 (&type->s_umount_key#93){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz-executor/16418:
 #0: ffff8881b98160e0 (&type->s_umount_key#93){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.5.1022/16687:
 #0: ffff888172a640e0 (&type->s_umount_key#93){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by dhcpcd/17130:
 #0: ffff8881186c6208 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
2 locks held by dhcpcd/17318:
 #0: ffff888118655008 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.6.1082/17630:
 #0: ffff888172a640e0 (&type->s_umount_key#93){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by dhcpcd-run-hook/18282:

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

NMI backtrace for cpu 1
CPU: 1 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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 13356 Comm: syz.6.754 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+0x5c/0x70
Code: 80 16 00 00 83 fa 02 75 21 48 8b 91 88 16 00 00 48 8b 32 48 8d 7e 01 8b 89 84 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> cc cc cc cc cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900066ff280 EFLAGS: 00000293
RAX: ffffffff835cabcf RBX: 0000000000000004 RCX: ffff88816c6957c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000ff
RBP: 0000000000000000 R08: 0000000200000000 R09: 0000000000000000
R10: 0030000000000000 R11: 000007ff00000020 R12: dffffc0000000000
R13: ffff88811fc3b000 R14: 0000000000000000 R15: 1ffff11023f87602
FS:  00007fbb65fad6c0(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558dea4fd680 CR3: 000000019c2ee000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dtSplitRoot+0x77f/0x16c0
 dtInsert+0xf19/0x5f10
 jfs_create+0x75b/0xb10
 path_openat+0x1395/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_creat+0x8f/0xc0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb6519c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb65fad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fbb65415fa0 RCX: 00007fbb6519c799
RDX: 0000000000000000 RSI: 0000000000000088 RDI: 00002000000001c0
RBP: 00007fbb65232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb65416038 R14: 00007fbb65415fa0 R15: 00007ffe521f2a78
 </TASK>
