INFO: task syz.1.402:8168 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.402       state:D stack:27032 pid:8168  tgid:8160  ppid:7684   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x149b/0x4fd0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x99/0x2e0
 lookup_slow+0x46/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x212/0x570
 user_path_at+0x3a/0x60
 __se_sys_fspick+0x10f/0x3d0
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f610a18f7c9
RSP: 002b:00007f610b03a038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b1
RAX: ffffffffffffffda RBX: 00007f610a3e6090 RCX: 00007f610a18f7c9
RDX: 0000000000000001 RSI: 0000200000000280 RDI: ffffffffffffff9c
RBP: 00007f610a1f297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f610a3e6128 R14: 00007f610a3e6090 R15: 00007fffc3addb48
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u9:7/1095:
 #0: ffff888103adf948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc9000826fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff8881133520e0 (&type->s_umount_key#75){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff888115bd01c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by kworker/u10:9/3715:
2 locks held by getty/5651:
 #0: ffff888113db30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
4 locks held by syz.1.402/8161:
1 lock held by syz.1.402/8168:
 #0: ffff888115bd0578 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: lookup_slow+0x46/0x70
6 locks held by syz.2.1087/12137:
1 lock held by syz.0.1090/12158:

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

NMI backtrace for cpu 0
CPU: 0 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+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x510/0xa50
 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: 12137 Comm: syz.2.1087 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:__lock_acquire+0x197c/0x2cf0
Code: 13 25 ff 0f 00 00 39 05 3e 9d e9 11 73 06 89 05 36 9d e9 11 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 b0 1a e1
RSP: 0018:ffffc90007fde510 EFLAGS: 00000006
RAX: ffffffff96146318 RBX: 00000000000003dd RCX: 00000000000002a9
RDX: ffffffff960b6098 RSI: ffff88810dc629d8 RDI: 00000000000003dd
RBP: 4c3f3dc91565fc80 R08: ffffc90007fde4d8 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819e5c10 R12: ffffffff9615e2c8
R13: ffffffff93290ee8 R14: ffff88810dc61d40 R15: 00000000000002a8
FS:  00007fc8a28aa6c0(0000) GS:ffff8882a9e21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2feddff8 CR3: 00000001764bc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x107/0x340
 psi_write_begin+0xab/0x160
 psi_account_irqtime+0x225/0x750
 __schedule+0x85b/0x4fd0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0x74/0x80
 __set_page_owner+0x329/0x4c0
 post_alloc_hook+0x234/0x290
 get_page_from_freelist+0x24e0/0x2580
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x86/0x3b0
 ___slab_alloc+0xe53/0x1820
 __slab_alloc+0x65/0x100
 kmem_cache_alloc_noprof+0x40f/0x710
 alloc_extent_state+0x22/0x2d0
 set_extent_bit+0x271/0x21f0
 btrfs_set_extent_bit+0x38/0x50
 btrfs_alloc_tree_block+0x964/0x1220
 btrfs_add_log_tree+0x160/0x890
 btrfs_log_inode_parent+0x731/0x1190
 btrfs_log_dentry_safe+0x62/0x80
 btrfs_sync_file+0xc33/0x1140
 btrfs_do_write_iter+0x689/0x820
 iter_file_splice_write+0x972/0x10b0
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x5a8/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc8a198f7c9
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:00007fc8a28aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc8a1be5fa0 RCX: 00007fc8a198f7c9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fc8a19f297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc8a1be6038 R14: 00007fc8a1be5fa0 R15: 00007ffef7abf748
 </TASK>
