loop0: detected capacity change from 0 to 32768
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 1 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
------------[ 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.0.0/5314
Modules linked in:
CPU: 0 UID: 0 PID: 5314 Comm: syz.0.0 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 0d 12 a1 fd 39 dd 48 89 dd 4c 89 64 24 18 76 36 e8 3c 10 a1 fd c7 44 24 14 00 00 00 00 e9 93 00 00 00 e8 2a 10 a1 fd 90 <0f> 0b 65 48 8b 05 ef e4 f7 0e 48 3b 84 24 80 00 00 00 0f 85 8d 05
RSP: 0018:ffffc9000f727a20 EFLAGS: 00010287
RAX: ffffffff84248a57 RBX: ffff8880493c9b28 RCX: 0000000000100000
RDX: ffffc9000ed9a000 RSI: 0000000000000773 RDI: 0000000000000774
RBP: 00000000000033b0 R08: ffffffff9011a5b7 R09: 1ffffffff20234b6
R10: dffffc0000000000 R11: fffffbfff20234b7 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880493c9b28 R15: ff7f000000000044
FS:  00007fb16ed826c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000101000 CR3: 0000000033535000 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_unlink+0x272/0x6c0 fs/namei.c:5470
 filename_unlinkat+0x3cd/0x610 fs/namei.c:5540
 __do_sys_unlink fs/namei.c:5575 [inline]
 __se_sys_unlink+0x2e/0x140 fs/namei.c:5572
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb16df9c799
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:00007fb16ed82028 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fb16e215fa0 RCX: 00007fb16df9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007fb16e032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb16e216038 R14: 00007fb16e215fa0 R15: 00007ffca64c05d8
 </TASK>