------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:2880!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5326 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+0x250d/0x2780 fs/ocfs2/suballoc.c:2880
Code: fe e9 3e f3 ff ff e8 72 b2 f7 fd 48 c7 c7 60 4a ef 8e 48 8b 74 24 68 4c 89 fa e8 8e a3 22 01 e9 4c f3 ff ff e8 54 b2 f7 fd 90 <0f> 0b e8 4c b2 f7 fd 90 0f 0b 4c 89 7c 24 08 65 8b 1d 31 d1 6b 0f
RSP: 0018:ffffc9000e027440 EFLAGS: 00010293
RAX: ffffffff83ce1eec RBX: 00000000ffffffff RCX: ffff888040662500
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000e0276a8 R08: 0000000000000020 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2061b3f R12: ffff88804854ebf0
R13: ffff88801ccbd058 R14: ffff888055926e00 R15: 1ffff92001c04e9c
FS:  00007f7582de76c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f111bc39000 CR3: 000000001fdd5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 _ocfs2_free_clusters+0x5c2/0xa80 fs/ocfs2/suballoc.c:2998
 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5988 [inline]
 __ocfs2_flush_truncate_log+0x768/0x1240 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+0x132/0xbf0 fs/ocfs2/super.c:616
 reconfigure_super+0x227/0x8a0 fs/super.c:1080
 do_remount fs/namespace.c:3400 [inline]
 path_mount+0xdc5/0x10e0 fs/namespace.c:4146
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7581f9e04a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7582de6e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7582de6ea0 RCX: 00007f7581f9e04a
RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000f40 R08: 00007f7582de6ea0 R09: 0000000001a4a438
R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007f7582de6e60 R14: 0000000000000000 R15: 0000200000000100
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_ocfs2_free_suballoc_bits+0x250d/0x2780 fs/ocfs2/suballoc.c:2880
Code: fe e9 3e f3 ff ff e8 72 b2 f7 fd 48 c7 c7 60 4a ef 8e 48 8b 74 24 68 4c 89 fa e8 8e a3 22 01 e9 4c f3 ff ff e8 54 b2 f7 fd 90 <0f> 0b e8 4c b2 f7 fd 90 0f 0b 4c 89 7c 24 08 65 8b 1d 31 d1 6b 0f
RSP: 0018:ffffc9000e027440 EFLAGS: 00010293
RAX: ffffffff83ce1eec RBX: 00000000ffffffff RCX: ffff888040662500
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000e0276a8 R08: 0000000000000020 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2061b3f R12: ffff88804854ebf0
R13: ffff88801ccbd058 R14: ffff888055926e00 R15: 1ffff92001c04e9c
FS:  00007f7582de76c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556abd79f168 CR3: 000000001fdd5000 CR4: 0000000000352ef0