INFO: task syz.1.7605:9785 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.7605      state:D stack:24568 pid:9785  tgid:9778  ppid:7983   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x883/0x1080
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 filename_mkdirat+0xd2/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f67d9cdd9
RSP: 002b:00007f5f65ff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5f68016090 RCX: 00007f5f67d9cdd9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f5f67e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f68016128 R14: 00007f5f68016090 R15: 00007fffec7778b8
 </TASK>
INFO: task syz.1.7605:9797 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.7605      state:D stack:25464 pid:9797  tgid:9778  ppid:7983   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x883/0x1080
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 filename_mkdirat+0xd2/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f67d9cdd9
RSP: 002b:00007f5f65fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5f68016180 RCX: 00007f5f67d9cdd9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f5f67e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f68016218 R14: 00007f5f68016180 R15: 00007fffec7778b8
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/1:1/31:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90000a67c40 ((work_completion)(&m->mpeg_thread)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5448:
 #0: ffff88816bf500a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: 
ffffc9000346b2e8
 (
&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
4 locks held by kworker/u9:6/10374:
 #0: ffff8881012d5940 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900047f7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: 
ffff88816b1380d8 (&type->s_umount_key#93){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: 
ffff88816d4280a8 (&tree->tree_lock/2){+.+.}-{4:4}, at: hfsplus_write_inode+0x54a/0x760
6 locks held by syz.1.7605/9779:
2 locks held by syz.1.7605/9785:
 #0: ffff88816b138410 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b34550e8 (&type->i_mutex_dir_key#19/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
2 locks held by syz.1.7605/9797:
 #0: ffff88816b138410 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b34550e8 (&type->i_mutex_dir_key#19/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
2 locks held by syz-executor/11921:
1 lock held by syz.5.8212/12450:
4 locks held by dhcpcd-run-hook/12460:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: 9779 Comm: syz.1.7605 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:io_serial_in+0x77/0xc0
Code: e8 5e ac 80 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ef 07 ec fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 ca 21 66 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90003cef198 EFLAGS: 00000006
RAX: 1ffffffff34f3e05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90003cef330 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8544f790 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff9a79f780 R15: 0000000000000000
FS:  00007f5f68b7b6c0(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0f85fea2f8 CR3: 00000001118e0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 serial8250_console_write+0x540/0x1ba0
 console_flush_all+0x718/0xb20
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 hfsplus_bnode_dump+0x189/0xa40
 hfsplus_brec_remove+0x617/0x700
 __hfsplus_delete_attr+0x1e0/0x420
 hfsplus_delete_all_attrs+0x1c8/0x360
 hfsplus_delete_cat+0xa49/0xee0
 hfsplus_unlink+0x361/0x930
 vfs_unlink+0x272/0x6c0
 filename_unlinkat+0x3cd/0x610
 __se_sys_unlinkat+0x83/0x1a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f67d9cdd9
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:00007f5f68b7b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f5f68015fa0 RCX: 00007f5f67d9cdd9
RDX: 0000000000000000 RSI: 0000200000000480 RDI: ffffffffffffff9c
RBP: 00007f5f67e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f68016038 R14: 00007f5f68015fa0 R15: 00007fffec7778b8
 </TASK>
