gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
------------[ cut here ]------------
gfs2_rbm_from_block(&rbm, bstart)
WARNING: fs/gfs2/rgrp.c:2267 at rgblk_free+0x147/0x750 fs/gfs2/rgrp.c:2267, CPU#0: syz.0.17/5787
Modules linked in:
CPU: 0 UID: 0 PID: 5787 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:rgblk_free+0x147/0x750 fs/gfs2/rgrp.c:2267
Code: de e8 7d 5a ac fd 39 dd 48 89 dd 4c 89 64 24 18 76 36 e8 ac 58 ac fd c7 44 24 14 00 00 00 00 e9 93 00 00 00 e8 9a 58 ac fd 90 <0f> 0b 65 48 8b 05 bf 31 db 0e 48 3b 84 24 80 00 00 00 0f 85 8d 05
RSP: 0018:ffffc90002fd7a60 EFLAGS: 00010293
RAX: ffffffff84182d87 RBX: ffff8880355e4000 RCX: ffff888033160000
RDX: 0000000000000000 RSI: 0000000000000927 RDI: 0000000025540013
RBP: 0000000000000927 R08: ffffffff8fef3e77 R09: 1ffffffff1fde7ce
R10: dffffc0000000000 R11: fffffbfff1fde7cf R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880355e4000 R15: 0000000025540013
FS:  00007f1b6f12b6c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f63fff CR3: 00000000424e6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_unlink_di+0x296/0x420 fs/gfs2/rgrp.c:2566
 gfs2_unlink_inode+0x11d/0x180 fs/gfs2/inode.c:1226
 gfs2_unlink+0x484/0x5d0 fs/gfs2/inode.c:1298
 vfs_rmdir+0x515/0x660 fs/namei.c:5245
 do_rmdir+0x278/0x470 fs/namei.c:5300
 __do_sys_rmdir fs/namei.c:5324 [inline]
 __se_sys_rmdir fs/namei.c:5322 [inline]
 __x64_sys_rmdir+0x47/0x50 fs/namei.c:5322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1b6e19af39
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:00007f1b6f12b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007f1b6e405fa0 RCX: 00007f1b6e19af39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f1b6e22fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1b6e406038 R14: 00007f1b6e405fa0 R15: 00007ffc686da958
 </TASK>