------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:2902!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5333 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:_ocfs2_free_suballoc_bits+0x24f9/0x2760 fs/ocfs2/suballoc.c:2902
Code: fe e9 84 f3 ff ff e8 f6 ae d7 fd 48 c7 c7 00 b9 13 8f 48 8b 74 24 38 4c 89 e2 e8 b2 10 23 01 e9 8e f3 ff ff e8 d8 ae d7 fd 90 <0f> 0b e8 d0 ae d7 fd 90 0f 0b 65 8b 1d 2a cd 7e 0f bf 07 00 00 00
RSP: 0018:ffffc9000f887440 EFLAGS: 00010287
RAX: ffffffff83eed2f8 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 00000000000016c8 RDI: 00000000000016c9
RBP: ffffc9000f8876a8 R08: 0000000000000020 R09: 0000000000000013
R10: dffffc0000000000 R11: fffffbfff20af61f R12: ffff88801320b648
R13: 1ffff110026416c9 R14: 1ffff92001f10e9c R15: ffff888012592e00
FS:  00007fdd870c56c0(0000) GS:ffff88808c546000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ba63e1000 CR3: 000000001f9fb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 _ocfs2_free_clusters+0x5c6/0xa80 fs/ocfs2/suballoc.c:3020
 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5988 [inline]
 __ocfs2_flush_truncate_log+0x762/0x1230 fs/ocfs2/alloc.c:6071
 ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6093
 ocfs2_sync_fs+0x11c/0x340 fs/ocfs2/super.c:406
 sync_filesystem+0x1cf/0x230 fs/sync.c:66
 ocfs2_reconfigure+0x131/0xbd0 fs/ocfs2/super.c:616
 reconfigure_super+0x232/0x8f0 fs/super.c:1020
 do_remount fs/namespace.c:3407 [inline]
 path_mount+0xd4b/0x1040 fs/namespace.c:4153
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd8619de99
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:00007fdd870c4fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdd86426180 RCX: 00007fdd8619de99
RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000000
RBP: 00007fdd86233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002390024 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd86426218 R14: 00007fdd86426180 R15: 00007fff3e4ded88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_ocfs2_free_suballoc_bits+0x24f9/0x2760 fs/ocfs2/suballoc.c:2902
Code: fe e9 84 f3 ff ff e8 f6 ae d7 fd 48 c7 c7 00 b9 13 8f 48 8b 74 24 38 4c 89 e2 e8 b2 10 23 01 e9 8e f3 ff ff e8 d8 ae d7 fd 90 <0f> 0b e8 d0 ae d7 fd 90 0f 0b 65 8b 1d 2a cd 7e 0f bf 07 00 00 00
RSP: 0018:ffffc9000f887440 EFLAGS: 00010287
RAX: ffffffff83eed2f8 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 00000000000016c8 RDI: 00000000000016c9
RBP: ffffc9000f8876a8 R08: 0000000000000020 R09: 0000000000000013
R10: dffffc0000000000 R11: fffffbfff20af61f R12: ffff88801320b648
R13: 1ffff110026416c9 R14: 1ffff92001f10e9c R15: ffff888012592e00
FS:  00007fdd870c56c0(0000) GS:ffff88808c546000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f889e1ded50 CR3: 000000001f9fb000 CR4: 0000000000352ef0