Zero length message leads to an empty skb
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.s: fatal: filesystem consistency error - inode = 1 34, function = gfs2_dinode_in, file = fs/gfs2/glops.c, line = 457
gfs2: fsid=syz:syz.s: G:  s:SH n:2/22 f:aqobnN t:SH d:EX/0 a:0 v:0 r:2 m:20 p:1
gfs2: fsid=syz:syz.s:  H: s:SH f:eEcH e:0 p:5332 [syz.0.0] init_journal+0x17f8/0x2260 fs/gfs2/ops_fstype.c:793
gfs2: fsid=syz:syz.s:  I: n:1/34 t:8 f:0x00 d:0x00000200 s:8388608 p:0
gfs2: fsid=syz:syz.s: about to withdraw this file system
------------[ cut here ]------------
kernel BUG at fs/gfs2/util.c:340!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5332 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00005-g488ef3560196 #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_withdraw+0x1463/0x14f0 fs/gfs2/util.c:340
Code: ff ff 48 8b 4c 24 10 80 e1 07 80 c1 03 38 c1 0f 8c 31 f9 ff ff 48 8b 7c 24 10 e8 d8 c4 2a fe e9 22 f9 ff ff e8 8e 4d c7 fd 90 <0f> 0b 48 8b 4c 24 10 80 e1 07 80 c1 03 38 c1 0f 8c 83 f9 ff ff 48
RSP: 0018:ffffc9000d1673e0 EFLAGS: 00010283
RAX: ffffffff83f91162 RBX: ffffc9000d1674a0 RCX: 0000000000100000
RDX: ffffc9000df6a000 RSI: 000000000000e0eb RDI: 000000000000e0ec
RBP: ffffc9000d167570 R08: ffffc9000d167107 R09: 1ffff92001a2ce20
R10: dffffc0000000000 R11: fffff52001a2ce21 R12: dffffc0000000000
R13: 1ffff92001a2ce90 R14: 1ffff11007834015 R15: 0000000000000004
FS:  00007f2e5a8cd6c0(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f660680a000 CR3: 0000000043231000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_dinode_in fs/gfs2/glops.c:-1 [inline]
 gfs2_inode_refresh fs/gfs2/glops.c:482 [inline]
 inode_go_instantiate+0xb77/0x1150 fs/gfs2/glops.c:503
 gfs2_instantiate+0x165/0x220 fs/gfs2/glock.c:468
 gfs2_glock_holder_ready fs/gfs2/glock.c:1333 [inline]
 gfs2_glock_wait+0x1d4/0x2a0 fs/gfs2/glock.c:1353
 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline]
 check_journal_clean+0x11c/0x310 fs/gfs2/util.c:61
 init_journal+0x17f8/0x2260 fs/gfs2/ops_fstype.c:793
 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
 gfs2_fill_super+0x1939/0x20e0 fs/gfs2/ops_fstype.c:1253
 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1679
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
 vfs_get_tree+0x92/0x2b0 fs/super.c:1802
 do_new_mount+0x24a/0xa40 fs/namespace.c:3885
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4410
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e599900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f2e5a8cce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2e5a8ccef0 RCX: 00007f2e599900ca
RDX: 000020000001f680 RSI: 000020000001f6c0 RDI: 00007f2e5a8cceb0
RBP: 000020000001f680 R08: 00007f2e5a8ccef0 R09: 0000000000000084
R10: 0000000000000084 R11: 0000000000000246 R12: 000020000001f6c0
R13: 00007f2e5a8cceb0 R14: 000000000001f789 R15: 0000200000000080
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gfs2_withdraw+0x1463/0x14f0 fs/gfs2/util.c:340
Code: ff ff 48 8b 4c 24 10 80 e1 07 80 c1 03 38 c1 0f 8c 31 f9 ff ff 48 8b 7c 24 10 e8 d8 c4 2a fe e9 22 f9 ff ff e8 8e 4d c7 fd 90 <0f> 0b 48 8b 4c 24 10 80 e1 07 80 c1 03 38 c1 0f 8c 83 f9 ff ff 48
RSP: 0018:ffffc9000d1673e0 EFLAGS: 00010283
RAX: ffffffff83f91162 RBX: ffffc9000d1674a0 RCX: 0000000000100000
RDX: ffffc9000df6a000 RSI: 000000000000e0eb RDI: 000000000000e0ec
RBP: ffffc9000d167570 R08: ffffc9000d167107 R09: 1ffff92001a2ce20
R10: dffffc0000000000 R11: fffff52001a2ce21 R12: dffffc0000000000
R13: 1ffff92001a2ce90 R14: 1ffff11007834015 R15: 0000000000000004
FS:  00007f2e5a8cd6c0(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005631fe595c38 CR3: 0000000043231000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400