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 3 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
------------[ cut here ]------------
kernel BUG at fs/gfs2/quota.c:331!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5359 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~bpo12+1 04/01/2014
RIP: 0010:qd_put+0x18a/0x190 fs/gfs2/quota.c:331
Code: e7 e8 6a da 27 fe e9 ee fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 7c 83 48 89 ef e8 41 db 27 fe e9 76 ff ff ff e8 57 de c2 fd 90 <0f> 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d457d08 EFLAGS: 00010287
RAX: ffffffff83fcec49 RBX: ffff888044286000 RCX: 0000000000100000
RDX: ffffc9000e1c2000 RSI: 0000000000001a5b RDI: 0000000000001a5c
RBP: 00000000ffffff80 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001a8af88 R12: ffff888044286070
R13: ffff888053386800 R14: ffff888044286030 R15: 1ffff11008850c0e
FS:  00007f125afe36c0(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f125afc1fc8 CR3: 0000000043ebf000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_quota_sync+0x3c4/0x460 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x4c/0xb0 fs/gfs2/super.c:658
 __iterate_supers+0x13a/0x290 fs/super.c:924
 ksys_sync+0xa3/0x150 fs/sync.c:103
 __ia32_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f125a18eec9
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:00007f125afe3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f125a3e5fa0 RCX: 00007f125a18eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f125a3e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f125a3e6038 R14: 00007f125a3e5fa0 R15: 00007ffd03e81228
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qd_put+0x18a/0x190 fs/gfs2/quota.c:331
Code: e7 e8 6a da 27 fe e9 ee fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 7c 83 48 89 ef e8 41 db 27 fe e9 76 ff ff ff e8 57 de c2 fd 90 <0f> 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d457d08 EFLAGS: 00010287
RAX: ffffffff83fcec49 RBX: ffff888044286000 RCX: 0000000000100000
RDX: ffffc9000e1c2000 RSI: 0000000000001a5b RDI: 0000000000001a5c
RBP: 00000000ffffff80 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001a8af88 R12: ffff888044286070
R13: ffff888053386800 R14: ffff888044286030 R15: 1ffff11008850c0e
FS:  00007f125afe36c0(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f125afc1fc8 CR3: 0000000043ebf000 CR4: 0000000000352ef0