syzbot

gfs2: fsid=syz:syz: Now mounting FS (format 1802)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 26 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4312 at fs/gfs2/rgrp.c:2638 gfs2_rbm_from_block fs/gfs2/rgrp.c:279 [inline]
WARNING: CPU: 1 PID: 4312 at fs/gfs2/rgrp.c:2638 gfs2_check_blk_type+0x418/0x660 fs/gfs2/rgrp.c:2637
Modules linked in:
CPU: 1 PID: 4312 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:gfs2_check_blk_type+0x418/0x660 fs/gfs2/rgrp.c:2638
Code: b6 04 28 84 c0 0f 85 f4 01 00 00 8b 1b 89 df 44 89 e6 e8 1b a1 06 fe 44 39 e3 76 24 e8 b1 9f 06 fe 31 db eb 72 e8 a8 9f 06 fe <0f> 0b bb f9 ff ff ff 49 bd 00 00 00 00 00 fc ff df e9 10 01 00 00
RSP: 0018:ffffc9000311f8a0 EFLAGS: 00010293
RAX: ffffffff83727002 RBX: 0000000000000000 RCX: ffff88802ab5bb80
RDX: 0000000000000000 RSI: 0000000000000012 RDI: 0000000000000013
RBP: ffffc9000311f9b0 R08: ffffc9000311f92f R09: 1ffff92000623f25
R10: dffffc0000000000 R11: fffff52000623f26 R12: 0000000000000012
R13: 0000000000000013 R14: ffff888077f8a028 R15: 1ffff1100eff1406
FS:  000055557a810500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f556f746000 CR3: 00000000224f3000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_inode_lookup+0x882/0xd30 fs/gfs2/inode.c:177
 gfs2_lookup_by_inum+0x4e/0xf0 fs/gfs2/inode.c:250
 gfs2_get_dentry fs/gfs2/export.c:139 [inline]
 gfs2_fh_to_dentry+0x12d/0x200 fs/gfs2/export.c:162
 exportfs_decode_fh_raw+0x173/0x630 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x36/0x70 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+0x401/0x840 fs/fhandle.c:223
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe87cb05cb9
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:00007ffd13e12438 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007fe87cd80fa0 RCX: 00007fe87cb05cb9
RDX: 0000000000000000 RSI: 0000200000012940 RDI: 0000000000000003
RBP: 00007fe87cb73bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe87cd80fac R14: 00007fe87cd80fa0 R15: 00007fe87cd80fa0
 </TASK>