loop0: detected capacity change from 0 to 32768
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 1 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
capability: warning: `syz.0.0' uses 32-bit capabilities (legacy support in use)
loop0: detected capacity change from 32768 to 64
Oops: stack segment: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5318 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~bpo12+1 04/01/2014
RIP: 0010:gfs2_glock_dq+0x60/0xb20 fs/gfs2/glock.c:1642
Code: 4c 89 ff e8 92 37 2a fe 4c 89 64 24 28 4c 89 7c 24 30 4d 8b 2f 4d 8d 7d 10 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <80> 7c 05 00 00 74 08 4c 89 ff e8 61 37 2a fe 49 8b 45 10 48 89 44
RSP: 0018:ffffc9000ecb7c00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc9000dc1a000 RSI: 0000000000000034 RDI: 0000000000000035
RBP: 0000000000000002 R08: ffff8880527874f3 R09: 1ffff1100a4f0e9e
R10: dffffc0000000000 R11: ffffed100a4f0e9f R12: 1ffff92001d96f9e
R13: 0000000000000000 R14: ffffc9000ecb7ce0 R15: 0000000000000010
FS:  00007f1aa76326c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68e9dd3000 CR3: 0000000041eb7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_glock_dq_uninit+0x25/0xb0 fs/gfs2/glock.c:1708
 gfs2_seek_data+0x16c/0x240 fs/gfs2/inode.c:2203
 gfs2_llseek+0x1a4/0x240 fs/gfs2/file.c:75
 vfs_llseek fs/read_write.c:389 [inline]
 ksys_lseek fs/read_write.c:402 [inline]
 __do_sys_lseek fs/read_write.c:412 [inline]
 __se_sys_lseek fs/read_write.c:410 [inline]
 __x64_sys_lseek+0x14f/0x1e0 fs/read_write.c:410
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1aa678efc9
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:00007f1aa7632038 EFLAGS: 00000246 ORIG_RAX: 0000000000000008
RAX: ffffffffffffffda RBX: 00007f1aa69e5fa0 RCX: 00007f1aa678efc9
RDX: 0000000000000003 RSI: 000000000ff8f9fe RDI: 0000000000000004
RBP: 00007f1aa6811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1aa69e6038 R14: 00007f1aa69e5fa0 R15: 00007ffe98d82768
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gfs2_glock_dq+0x60/0xb20 fs/gfs2/glock.c:1642
Code: 4c 89 ff e8 92 37 2a fe 4c 89 64 24 28 4c 89 7c 24 30 4d 8b 2f 4d 8d 7d 10 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <80> 7c 05 00 00 74 08 4c 89 ff e8 61 37 2a fe 49 8b 45 10 48 89 44
RSP: 0018:ffffc9000ecb7c00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc9000dc1a000 RSI: 0000000000000034 RDI: 0000000000000035
RBP: 0000000000000002 R08: ffff8880527874f3 R09: 1ffff1100a4f0e9e
R10: dffffc0000000000 R11: ffffed100a4f0e9f R12: 1ffff92001d96f9e
R13: 0000000000000000 R14: ffffc9000ecb7ce0 R15: 0000000000000010
FS:  00007f1aa76326c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1aa7610fc8 CR3: 0000000041eb7000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	4c 89 ff             	mov    %r15,%rdi
   3:	e8 92 37 2a fe       	call   0xfe2a379a
   8:	4c 89 64 24 28       	mov    %r12,0x28(%rsp)
   d:	4c 89 7c 24 30       	mov    %r15,0x30(%rsp)
  12:	4d 8b 2f             	mov    (%r15),%r13
  15:	4d 8d 7d 10          	lea    0x10(%r13),%r15
  19:	4c 89 fd             	mov    %r15,%rbp
  1c:	48 c1 ed 03          	shr    $0x3,%rbp
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	80 7c 05 00 00       	cmpb   $0x0,0x0(%rbp,%rax,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 61 37 2a fe       	call   0xfe2a379a
  39:	49 8b 45 10          	mov    0x10(%r13),%rax
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	44                   	rex.R