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
gfs2: fsid=syz:syz.0: found 1 quota changes
capability: warning: `syz.0.0' uses deprecated v2 capabilities in a way that may be insecure
gfs2: fsid=syz:syz.0: fatal assertion failed
------------[ cut here ]------------
kernel BUG at fs/gfs2/quota.c:320!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5317 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:__qd_hold fs/gfs2/quota.c:320 [inline]
RIP: 0010:do_qc+0x5c1/0x5e0 fs/gfs2/quota.c:705
Code: 00 00 00 00 00 fc ff df 48 8b 0c 24 80 3c 01 00 74 0a 48 8b 7c 24 10 e8 dd e4 17 fe 48 8b 44 24 10 48 8b 38 e8 50 1e 14 fd 90 <0f> 0b e8 c8 0a ae fd 48 8b 7c 24 10 e8 3e 1e 14 fd 90 0f 0b 66 66
RSP: 0018:ffffc9000fca70e8 EFLAGS: 00010246
RAX: 000000000000002c RBX: 1ffff11008de260e RCX: 730791da45d23700
RDX: ffffc9000f3ea000 RSI: 00000000000cff3a RDI: 00000000000cff3b
RBP: 000000000000000e R08: ffffc9000fca6e67 R09: 1ffff92001f94dcc
R10: dffffc0000000000 R11: fffff52001f94dcd R12: ffff888046f13000
R13: ffff888046f13070 R14: ffff888046f13090 R15: 0000000000000000
FS:  00007f39b71e06c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000555000 CR3: 0000000011a93000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_quota_change+0x391/0x800 fs/gfs2/quota.c:1304
 gfs2_alloc_blocks+0x18ca/0x2090 fs/gfs2/rgrp.c:2494
 __gfs2_iomap_alloc+0x4d4/0x1ab0 fs/gfs2/bmap.c:708
 gfs2_iomap_begin_write fs/gfs2/bmap.c:1070 [inline]
 gfs2_iomap_begin+0xb24/0x11e0 fs/gfs2/bmap.c:1133
 iomap_iter+0x600/0xf30 fs/iomap/iter.c:110
 iomap_file_buffered_write+0x252/0xb30 fs/iomap/buffered-io.c:1187
 gfs2_file_buffered_write+0x4eb/0x870 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x976/0x1130 fs/gfs2/file.c:1166
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:686
 ksys_write+0x150/0x270 fs/read_write.c:738
 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: 0033:0x7f39b639acb9
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:00007f39b71e0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f39b6615fa0 RCX: 00007f39b639acb9
RDX: 000000000208e24b RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007f39b6408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39b6616038 R14: 00007f39b6615fa0 R15: 00007ffde3ac2bc8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__qd_hold fs/gfs2/quota.c:320 [inline]
RIP: 0010:do_qc+0x5c1/0x5e0 fs/gfs2/quota.c:705
Code: 00 00 00 00 00 fc ff df 48 8b 0c 24 80 3c 01 00 74 0a 48 8b 7c 24 10 e8 dd e4 17 fe 48 8b 44 24 10 48 8b 38 e8 50 1e 14 fd 90 <0f> 0b e8 c8 0a ae fd 48 8b 7c 24 10 e8 3e 1e 14 fd 90 0f 0b 66 66
RSP: 0018:ffffc9000fca70e8 EFLAGS: 00010246
RAX: 000000000000002c RBX: 1ffff11008de260e RCX: 730791da45d23700
RDX: ffffc9000f3ea000 RSI: 00000000000cff3a RDI: 00000000000cff3b
RBP: 000000000000000e R08: ffffc9000fca6e67 R09: 1ffff92001f94dcc
R10: dffffc0000000000 R11: fffff52001f94dcd R12: ffff888046f13000
R13: ffff888046f13070 R14: ffff888046f13090 R15: 0000000000000000
FS:  00007f39b71e06c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000555000 CR3: 0000000011a93000 CR4: 0000000000352ef0