------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:2568!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5320 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:_ocfs2_free_suballoc_bits+0x107c/0x1330 fs/ocfs2/suballoc.c:2568
Code: 89 f1 e9 8f fa ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 4d fc ff ff 4c 89 f7 e8 3f bc 78 fe e9 40 fc ff ff e8 b5 7c 11 fe 90 <0f> 0b e8 ad 7c 11 fe 90 0f 0b f3 0f 1e fa 65 44 8b 25 a2 46 c0 0e
RSP: 0000:ffffc9000d3e7520 EFLAGS: 00010293
RAX: ffffffff83ae997b RBX: 0000000000000001 RCX: ffff8880317b4900
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d3e76c8 R08: 0000000000000020 R09: 0000000000000008
R10: dffffc0000000000 R11: fffffbfff1ef9f6f R12: ffff8880528c4e00
R13: dffffc0000000000 R14: 0000000000000020 R15: ffff888000904fb8
FS:  00007fdb5b4366c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff470091b45 CR3: 0000000012647000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 _ocfs2_free_clusters+0x5e4/0xa70 fs/ocfs2/suballoc.c:2672
 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5979 [inline]
 __ocfs2_flush_truncate_log+0x706/0x10e0 fs/ocfs2/alloc.c:6062
 ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6084
 ocfs2_sync_fs+0x116/0x310 fs/ocfs2/super.c:406
 sync_filesystem+0x1cf/0x230 fs/sync.c:66
 ocfs2_reconfigure+0x139/0xb90 fs/ocfs2/super.c:616
 reconfigure_super+0x227/0x890 fs/super.c:1076
 do_remount fs/namespace.c:3279 [inline]
 path_mount+0xd1a/0xfe0 fs/namespace.c:4029
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4215
 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: 0033:0x7fdb5a59076a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fdb5b435e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdb5b435ef0 RCX: 00007fdb5a59076a
RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000f40 R08: 00007fdb5b435ef0 R09: 0000000001a4a438
R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007fdb5b435eb0 R14: 0000000000000000 R15: 0000200000000100
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_ocfs2_free_suballoc_bits+0x107c/0x1330 fs/ocfs2/suballoc.c:2568
Code: 89 f1 e9 8f fa ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 4d fc ff ff 4c 89 f7 e8 3f bc 78 fe e9 40 fc ff ff e8 b5 7c 11 fe 90 <0f> 0b e8 ad 7c 11 fe 90 0f 0b f3 0f 1e fa 65 44 8b 25 a2 46 c0 0e
RSP: 0000:ffffc9000d3e7520 EFLAGS: 00010293
RAX: ffffffff83ae997b RBX: 0000000000000001 RCX: ffff8880317b4900
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d3e76c8 R08: 0000000000000020 R09: 0000000000000008
R10: dffffc0000000000 R11: fffffbfff1ef9f6f R12: ffff8880528c4e00
R13: dffffc0000000000 R14: 0000000000000020 R15: ffff888000904fb8
FS:  00007fdb5b4366c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd4dd7a340 CR3: 0000000012647000 CR4: 0000000000352ef0