------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:2568!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 12 Comm: kworker/u4:0 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
Workqueue: ocfs2_wq ocfs2_truncate_log_worker
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 7f 99 78 fe e9 40 fc ff ff e8 45 4b 11 fe 90 <0f> 0b e8 3d 4b 11 fe 90 0f 0b f3 0f 1e fa 65 44 8b 25 12 48 c0 0e
RSP: 0018:ffffc900001e74e0 EFLAGS: 00010293
RAX: ffffffff83aec80b RBX: 00000000ffffffff RCX: ffff88801bedc900
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc900001e7688 R08: 0000000000007000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1efa1cf R12: ffff888054a98e00
R13: dffffc0000000000 R14: 0000000000007000 R15: ffff888042e3cfb8
FS:  0000000000000000(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff1f4398fb8 CR3: 000000004201e000 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 fs/ocfs2/alloc.c:6084 [inline]
 ocfs2_truncate_log_worker+0xa2/0x190 fs/ocfs2/alloc.c:6097
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 7f 99 78 fe e9 40 fc ff ff e8 45 4b 11 fe 90 <0f> 0b e8 3d 4b 11 fe 90 0f 0b f3 0f 1e fa 65 44 8b 25 12 48 c0 0e
RSP: 0018:ffffc900001e74e0 EFLAGS: 00010293
RAX: ffffffff83aec80b RBX: 00000000ffffffff RCX: ffff88801bedc900
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc900001e7688 R08: 0000000000007000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1efa1cf R12: ffff888054a98e00
R13: dffffc0000000000 R14: 0000000000007000 R15: ffff888042e3cfb8
FS:  0000000000000000(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005569ec81e5d0 CR3: 000000004201e000 CR4: 0000000000352ef0