syzbot

gfs2: fsid=loop0.0: first mount done, others may mount
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WARNING: CPU: 1 PID: 3499 at fs/gfs2/rgrp.c:2638 gfs2_rbm_from_block fs/gfs2/rgrp.c:279 [inline]
WARNING: CPU: 1 PID: 3499 at fs/gfs2/rgrp.c:2638 gfs2_check_blk_type+0x441/0x670 fs/gfs2/rgrp.c:2637
Modules linked in:
CPU: 0 PID: 3499 Comm: syz-executor912 Not tainted 5.15.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
RIP: 0010:gfs2_check_blk_type+0x441/0x670 fs/gfs2/rgrp.c:2638
Code: 85 d2 01 00 00 8b 1b 89 df 44 89 f6 e8 e8 ce f0 fd 4c 89 74 24 10 44 39 f3 76 21 e8 79 cd f0 fd 45 31 ed eb 6e e8 6f cd f0 fd <0f> 0b 41 bf f9 ff ff ff 48 8b 5c 24 18 e9 46 01 00 00 e8 58 cd f0
RSP: 0018:ffffc90002c9f8a0 EFLAGS: 00010293
RAX: ffffffff838f33e0 RBX: ffff88801abd8028 RCX: ffff88807965d940
RDX: 0000000000000000 RSI: 0000000000000012 RDI: 0000000000000013
RBP: ffffc90002c9f9b0 R08: ffffffff838f33d6 R09: fffff52000593f26
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100357b006
R13: ffff88801abd8000 R14: 0000000000000012 R15: 0000000000000013
FS:  0000555556e11380(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559f07d8f0a0 CR3: 000000001f96d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_inode_lookup+0x5be/0xd10 fs/gfs2/inode.c:177
 gfs2_lookup_by_inum+0x4d/0xe0 fs/gfs2/inode.c:250
 gfs2_get_dentry fs/gfs2/export.c:139 [inline]
 gfs2_fh_to_dentry+0x131/0x1f0 fs/gfs2/export.c:162
 exportfs_decode_fh_raw+0x140/0x590 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x38/0x70 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x44c/0x970 fs/fhandle.c:223
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f30b337a609
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff8e108638 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007fff8e108808 RCX: 00007f30b337a609
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f30b3400610 R08: 0000000000012527 R09: 00007fff8e108808
R10: 00007fff8e1084f0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff8e1087f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>