IPVS: ftp: loaded support on port[0] = 21
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS...
gfs2: fsid=syz:syz.s: first mount done, others may mount
BUG: unable to handle kernel NULL pointer dereference at 00000000000000f8
PGD 22d8f4067 P4D 22d8f4067 PUD 22b0d8067 PMD 0 
Oops: 0000 [#1] SMP
CPU: 1 PID: 2922 Comm: syz-executor.0 Not tainted 4.19.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:gfs2_rgrp_dump+0xb/0x140 fs/gfs2/rgrp.c:2260
Code: 83 bf 68 04 00 00 00 74 12 55 48 81 c7 58 04 00 00 48 89 e5 e8 96 6d fe ff 5d c3 c3 0f 1f 00 55 48 89 e5 41 56 41 55 41 54 53 <48> 8b 9e f8 00 00 00 48 85 db 0f 84 e1 00 00 00 8b 43 78 48 c7 c6
RSP: 0018:ffffc90001387948 EFLAGS: 00010246
RAX: 0000000000000808 RBX: ffff8802303110c0 RCX: ffffffff82827951
RDX: ffffffff82457040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90001387968 R08: 0000000000000332 R09: ffff8802374036c0
R10: 0000000000001000 R11: 0000000000001000 R12: ffff8802284a8000
R13: ffffffff82457040 R14: ffffffff82827951 R15: 0000000000000332
FS:  00007ff49843c6c0(0000) GS:ffff880237b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000f8 CR3: 000000022da32000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 gfs2_consist_rgrpd_i+0x28/0x50 fs/gfs2/util.c:186
 compute_bitstructs fs/gfs2/rgrp.c:818 [inline]
 read_rindex_entry+0x41a/0x450 fs/gfs2/rgrp.c:919
 gfs2_ri_update+0x1f/0xb0 fs/gfs2/rgrp.c:996
 gfs2_rindex_update+0x13d/0x150 fs/gfs2/rgrp.c:1042
 init_inodes+0x691/0x7c0 fs/gfs2/ops_fstype.c:815
 fill_super+0x84e/0xb10 fs/gfs2/ops_fstype.c:1149
 gfs2_mount+0x22a/0x249 fs/gfs2/ops_fstype.c:1302
 mount_fs+0x34/0x10f fs/super.c:1261
 vfs_kern_mount.part.11+0x58/0x160 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2457 [inline]
 do_mount+0x20e/0xdc0 fs/namespace.c:2787
 ksys_mount+0xb1/0xd0 fs/namespace.c:3003
 __do_sys_mount fs/namespace.c:3017 [inline]
 __se_sys_mount fs/namespace.c:3014 [inline]
 __x64_sys_mount+0x20/0x30 fs/namespace.c:3014
 do_syscall_64+0x63/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff4988baf5a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff49843bee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff49843bf80 RCX: 00007ff4988baf5a
RDX: 00000000200124c0 RSI: 0000000020000000 RDI: 00007ff49843bf40
RBP: 00000000200124c0 R08: 00007ff49843bf80 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000020000000
R13: 00007ff49843bf40 R14: 0000000000012517 R15: 0000000020000100
Modules linked in:
CR2: 00000000000000f8
---[ end trace ca79a58fa27f3344 ]---
RIP: 0010:gfs2_rgrp_dump+0xb/0x140 fs/gfs2/rgrp.c:2260
Code: 83 bf 68 04 00 00 00 74 12 55 48 81 c7 58 04 00 00 48 89 e5 e8 96 6d fe ff 5d c3 c3 0f 1f 00 55 48 89 e5 41 56 41 55 41 54 53 <48> 8b 9e f8 00 00 00 48 85 db 0f 84 e1 00 00 00 8b 43 78 48 c7 c6
RSP: 0018:ffffc90001387948 EFLAGS: 00010246
RAX: 0000000000000808 RBX: ffff8802303110c0 RCX: ffffffff82827951
RDX: ffffffff82457040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90001387968 R08: 0000000000000332 R09: ffff8802374036c0
R10: 0000000000001000 R11: 0000000000001000 R12: ffff8802284a8000
R13: ffffffff82457040 R14: ffffffff82827951 R15: 0000000000000332
FS:  00007ff49843c6c0(0000) GS:ffff880237b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000f8 CR3: 000000022da32000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	83 bf 68 04 00 00 00 	cmpl   $0x0,0x468(%rdi)
   7:	74 12                	je     0x1b
   9:	55                   	push   %rbp
   a:	48 81 c7 58 04 00 00 	add    $0x458,%rdi
  11:	48 89 e5             	mov    %rsp,%rbp
  14:	e8 96 6d fe ff       	call   0xfffe6daf
  19:	5d                   	pop    %rbp
  1a:	c3                   	ret
  1b:	c3                   	ret
  1c:	0f 1f 00             	nopl   (%rax)
  1f:	55                   	push   %rbp
  20:	48 89 e5             	mov    %rsp,%rbp
  23:	41 56                	push   %r14
  25:	41 55                	push   %r13
  27:	41 54                	push   %r12
  29:	53                   	push   %rbx
* 2a:	48 8b 9e f8 00 00 00 	mov    0xf8(%rsi),%rbx <-- trapping instruction
  31:	48 85 db             	test   %rbx,%rbx
  34:	0f 84 e1 00 00 00    	je     0x11b
  3a:	8b 43 78             	mov    0x78(%rbx),%eax
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7
  3f:	c6                   	.byte 0xc6