INFO: task syz-executor:6522 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22640 pid:6522  tgid:6522  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 bit_wait+0x11/0xd0
 __wait_on_bit+0xac/0x300
 out_of_line_wait_on_bit+0x13b/0x190
 gfs2_glock_wait+0xbd/0x2a0
 __gfs2_lookup+0x131/0x2b0
 __lookup_slow+0x1fb/0x2f0
 lookup_slow+0x53/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x265/0x5d0
 user_path_at+0x40/0x160
 __x64_sys_umount+0xf6/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1b9c79f397
RSP: 002b:00007ffc87532b68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f1b9c8344bb RCX: 00007f1b9c79f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc87532c20
RBP: 00007ffc87532c20 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc87533d10
R13: 00007f1b9c8344bb R14: 000000000001762b R15: 00007ffc87535ed0
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#0:
 #0: ffffffff8ed5c920 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by kworker/0:2/805: 2, last CPU#0:
 #0: ffff888117edc940 ((wq_completion)wg-crypt-wg2#12){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90004bbfc40 ((work_completion)(&peer->transmit_packet_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by getty/5423: 2, on CPU#0:
 #0: ffff888118a860a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by syz-executor/6522: 1, on CPU#1:
 #0: ffff8881a4e48140 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: lookup_slow+0x46/0x70
locks held by syz.4.690/12098: 3, last CPU#1:
 #0: ffff8881012f8460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff88810c396910 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120
 #2: ffffffff8ed5c920 (rcu_read_lock){....}-{1:3}, at: filemap_get_entry+0xcd/0x3f0
locks held by syz.7.691/12100: 2, last CPU#0:
 #0: ffff8881012f8460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff8881ba2e3ed8 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120

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

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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 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: 12098 Comm: syz.4.690 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:preempt_count_add+0x0/0x140
Code: be e0 0e 00 00 e8 90 f8 a2 00 e9 70 ff ff ff e9 d3 fe ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df 48 63 c7
RSP: 0018:ffffc90003167708 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88810c3969f0 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8c6dae60 RDI: 0000000000000001
RBP: ffffc90003167870 R08: ffffffff907a5a7f R09: 1ffffffff20f4b4f
R10: dffffc0000000000 R11: fffffbfff20f4b50 R12: ffffea0006841748
R13: ffffc900031677c0 R14: 0000000000000000 R15: ffffea0006841758
FS:  00007fca2fdd56c0(0000) GS:ffff8882a8ccb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa166b72000 CR3: 00000001100b6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 _raw_spin_lock_irq+0x21/0x50
 shmem_add_to_page_cache+0x7b2/0xd40
 shmem_alloc_and_add_folio+0x854/0xf60
 shmem_get_folio_gfp+0x5da/0x16d0
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2d5/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca2ef5e98e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fca2fdd4da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fca2fdd56c0 RCX: 00007fca2ef5e98e
RDX: 0000000001000000 RSI: 00007fca24c00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fca2fdd4ee0 R14: 00007fca2fdd4ea0 R15: 00007fca24c00000
 </TASK>
