gfs2: fsid=statfs_quantum: Now mounting FS (format 1801)...
gfs2: fsid=statfs_quantum.s: journal 0 mapped with 16 extents in 0ms
gfs2: fsid=statfs_quantum.s: first mount done, others may mount
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5755 at fs/gfs2/rgrp.c:2628 gfs2_check_blk_type+0x403/0x650 fs/gfs2/rgrp.c:2628
Modules linked in:
CPU: 0 UID: 0 PID: 5755 Comm: syz.0.15 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_check_blk_type+0x403/0x650 fs/gfs2/rgrp.c:2628
Code: 04 28 84 c0 0f 85 f5 01 00 00 8b 1b 89 df 44 89 e6 e8 31 da bb fd 44 39 e3 76 26 e8 67 d8 bb fd 31 db eb 74 e8 5e d8 bb fd 90 <0f> 0b 90 bb f9 ff ff ff 49 bd 00 00 00 00 00 fc ff df e9 1c 01 00
RSP: 0018:ffffc9000297f820 EFLAGS: 00010293
RAX: ffffffff84043aac RBX: 0000000000000000 RCX: ffff888000b60000
RDX: 0000000000000000 RSI: 0000000000000012 RDI: 0000000000000013
RBP: ffffc9000297f930 R08: ffff88804178c647 R09: 1ffff110082f18c8
R10: dffffc0000000000 R11: ffffed10082f18c9 R12: 0000000000000012
R13: 0000000000000013 R14: ffff888058fa4028 R15: 1ffff1100b1f4806
FS:  00007f77dbf586c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2df5ffff CR3: 000000004e6da000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_inode_lookup+0x9c5/0xb10 fs/gfs2/inode.c:178
 gfs2_lookup_by_inum+0x52/0x100 fs/gfs2/inode.c:251
 gfs2_get_dentry fs/gfs2/export.c:139 [inline]
 gfs2_fh_to_dentry+0x136/0x1f0 fs/gfs2/export.c:160
 exportfs_decode_fh_raw+0x178/0x6e0 fs/exportfs/expfs.c:456
 do_handle_to_path+0xa4/0x1a0 fs/fhandle.c:276
 handle_to_path fs/fhandle.c:400 [inline]
 do_handle_open+0x6b4/0x8f0 fs/fhandle.c:415
 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: 0033:0x7f77db17e719
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:00007f77dbf58038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007f77db335f80 RCX: 00007f77db17e719
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007f77db1f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f77db335f80 R15: 00007fffef1ca4d8
 </TASK>