INFO: task kworker/u10:4:82 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:4   state:D stack:22504 pid:82    tgid:82    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn
 (flush-7:4)
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 hfsplus_write_inode+0x505/0x700
 __writeback_single_inode+0x6ac/0xf90
 writeback_sb_inodes+0x9de/0x1b00
 __writeback_inodes_wb+0x114/0x240
 wb_writeback+0x42f/0xad0
 wb_workfn+0xc92/0x10f0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8eb59c20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u12:0/54:
 #0: ffff888104751140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000be7c40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by kworker/u13:0/55:
 #0: ffff888104751140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000bf7c40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
4 locks held by kworker/u10:4/82:
 #0: ffff88816269f140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000231fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff888109fe20d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881bd94c0a8 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_write_inode+0x505/0x700
2 locks held by getty/5426:
 #0: ffff888113e180a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
12 locks held by syz.4.2277/11585:
1 lock held by syz.3.3800/15452:
 #0: ffff888115da4378 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0
1 lock held by syz.3.3800/15461:
1 lock held by syz.3.3800/15462:
1 lock held by syz.6.3802/15456:
 #0: ffff88801bc133f8 (mapping.invalidate_lock
#2){++++}-{4:4}, at: raw_spin_rq_lock_nested+0x2d/0x160
1 lock held by syz.6.3802/15457:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 15457 Comm: syz.6.3802 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:post_alloc_hook+0x102/0x250
Code: f4 4c 2b 25 60 8f 28 0c 49 c1 e4 06 48 c7 c0 00 af 4e 8e 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 00 af 4e 8e e8 ee e7 0e 00 <4c> 03 25 27 8f 28 0c 44 89 f9 48 c1 e1 0c 31 c0 4c 89 e7 48 c1 e9
RSP: 0018:ffffc90003f5f360 EFLAGS: 00000246
RAX: 1ffffffff1c9d5e0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed102e32de00
RBP: 0000000000440dc0 R08: ffffffff90571d37 R09: 0000000000000000
R10: ffffed102e32dc00 R11: fffffbfff20ae3a7 R12: 000000017196e000
R13: dffffc0000000000 R14: ffffea0005c65b80 R15: 0000000000000001
FS:  00007f120ccda6c0(0000) GS:ffff8882a8f5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f120bdeb7c0 CR3: 000000019d308000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 get_page_from_freelist+0x2205/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 alloc_pages_mpol+0x21e/0x390
 alloc_pages_noprof+0xac/0x2a0
 pte_alloc_one+0x22/0x370
 do_pte_missing+0x13c8/0x34b0
 handle_mm_fault+0x1a53/0x3750
 __get_user_pages+0x1675/0x2750
 populate_vma_page_range+0x2be/0x3c0
 __mm_populate+0x25f/0x390
 vm_mmap_pgoff+0x353/0x4e0
 ksys_mmap_pgoff+0x4dc/0x760
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f120bd9e0d9
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:00007f120ccda028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f120c025fa0 RCX: 00007f120bd9e0d9
RDX: 000000000000000a RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f120be35024 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f120c026038 R14: 00007f120c025fa0 R15: 00007ffcb05754e8
 </TASK>
