------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:2584!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5675 Comm: syz-executor 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+0x1176/0x1330 fs/ocfs2/suballoc.c:2584
Code: e7 e8 1e ce 78 fe 49 8b 3c 24 4c 89 fe 4c 89 f2 48 8b 4c 24 48 4c 8b 44 24 20 e8 35 9f 00 00 e9 10 01 00 00 e8 1b 94 11 fe 90 <0f> 0b e8 13 94 11 fe 90 0f 0b f3 0f 1e fa 65 8b 1d a9 30 e3 0e bf
RSP: 0018:ffffc90002a0f700 EFLAGS: 00010293
RAX: ffffffff83aebf75 RBX: 00000000000005ab RCX: ffff888000e1a480
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 00000000000005ab
RBP: ffffc90002a0f8a8 R08: ffffffff8f9e3177 R09: 1ffffffff1f3c62e
R10: dffffc0000000000 R11: fffffbfff1f3c62f R12: ffff888041b58828
R13: dffffc0000000000 R14: 0000000000000400 R15: ffff8880366ccfb8
FS:  000055558b461500(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002369000 CR3: 000000004d6da000 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
 generic_shutdown_super+0x6f/0x2c0 fs/super.c:621
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23e6d7f227
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcd6114148 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f23e6df0a14 RCX: 00007f23e6d7f227
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcd6114200
RBP: 00007ffcd6114200 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcd6115280
R13: 00007f23e6df0a14 R14: 000000000002229b R15: 00007ffcd61152c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_ocfs2_free_suballoc_bits+0x1176/0x1330 fs/ocfs2/suballoc.c:2584
Code: e7 e8 1e ce 78 fe 49 8b 3c 24 4c 89 fe 4c 89 f2 48 8b 4c 24 48 4c 8b 44 24 20 e8 35 9f 00 00 e9 10 01 00 00 e8 1b 94 11 fe 90 <0f> 0b e8 13 94 11 fe 90 0f 0b f3 0f 1e fa 65 8b 1d a9 30 e3 0e bf
RSP: 0018:ffffc90002a0f700 EFLAGS: 00010293
RAX: ffffffff83aebf75 RBX: 00000000000005ab RCX: ffff888000e1a480
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 00000000000005ab
RBP: ffffc90002a0f8a8 R08: ffffffff8f9e3177 R09: 1ffffffff1f3c62e
R10: dffffc0000000000 R11: fffffbfff1f3c62f R12: ffff888041b58828
R13: dffffc0000000000 R14: 0000000000000400 R15: ffff8880366ccfb8
FS:  000055558b461500(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002369000 CR3: 000000004d6da000 CR4: 0000000000352ef0