loop0: detected capacity change from 0 to 32768
ocfs2: Readonly device (7,0) detected. Cluster services will not be used for this mount. Recovery will be skipped.
ocfs2: Mounting device (7,0) on (node local, slot 65535) with ordered data mode.
(syz.0.0,5319,0):ocfs2_get_dentry:64 ERROR: getting nfs sync lock(EX) failed -30
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#0: syz.0.0/5319
WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12e2/0x1550 kernel/locking/mutex.c:821, CPU#0: syz.0.0/5319
Modules linked in:
CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x12e9/0x1550 kernel/locking/mutex.c:821
Code: b8 7a 90 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d eb 76 90 04 00 75 13 48 8d 3d 6e 73 93 04 48 c7 c6 20 12 0d 8c <67> 48 0f b9 3a 90 e9 6b ee ff ff 90 0f 0b 90 e9 3e f2 ff ff 90 0f
RSP: 0018:ffffc9000f13f780 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc9000e762000 RSI: ffffffff8c0d1220 RDI: ffffffff907db510
RBP: ffffc9000f13f920 R08: ffffffff907ab883 R09: 1ffffffff20f5710
R10: dffffc0000000000 R11: fffffbfff20f5711 R12: ffff88803dca4de0
R13: 0000000000000000 R14: 1ffff92001e27f04 R15: 0000000000000000
FS:  00007f89a69f56c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564715859168 CR3: 000000001f8d0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_trim_fs_lock_res_init+0x33/0x1c0 fs/ocfs2/dlmglue.c:703
 ocfs2_trim_fs+0x13c/0x24d0 fs/ocfs2/alloc.c:7692
 ocfs2_ioctl+0x6bf/0x7e0 fs/ocfs2/ioctl.c:948
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89aa59e159
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:00007f89a69f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f89aa825fa0 RCX: 00007f89aa59e159
RDX: 00002000000004c0 RSI: 00000000c0185879 RDI: 0000000000000000
RBP: 00007f89aa63506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f89aa826038 R14: 00007f89aa825fa0 R15: 00007ffd88a03a78
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 7a 90 48 c1       	mov    $0xc148907a,%eax
   5:	e8 03 0f b6 04       	call   0x4b60f0d
   a:	18 84 c0 0f 85 47 02 	sbb    %al,0x247850f(%rax,%rax,8)
  11:	00 00                	add    %al,(%rax)
  13:	83 3d eb 76 90 04 00 	cmpl   $0x0,0x49076eb(%rip)        # 0x4907705
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d 6e 73 93 04 	lea    0x493736e(%rip),%rdi        # 0x4937391
  23:	48 c7 c6 20 12 0d 8c 	mov    $0xffffffff8c0d1220,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	90                   	nop
  30:	e9 6b ee ff ff       	jmp    0xffffeea0
  35:	90                   	nop
  36:	0f 0b                	ud2
  38:	90                   	nop
  39:	e9 3e f2 ff ff       	jmp    0xfffff27c
  3e:	90                   	nop
  3f:	0f                   	.byte 0xf