option from the mount to silence this warning.
=======================================================
ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode.
Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5467 Comm: syz.0.17 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_bg_discontig_add_extent fs/ocfs2/suballoc.c:335 [inline]
RIP: 0010:ocfs2_block_group_fill+0x5bd/0xa70 fs/ocfs2/suballoc.c:386
Code: 34 1a 49 81 c6 50 01 00 00 45 0f b7 3f 49 83 c5 02 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 eb 03 00 00 44 89 f8 31 d2 <66> 41 f7 75 00 0f b7 d8 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0
RSP: 0018:ffffc90002b2f080 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888000dba480
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002b2f188 R08: 00313050554f5247 R09: 00313050554f5247
R10: dffffc0000000000 R11: ffffed1009f9b801 R12: dffffc0000000000
R13: ffff88804fcc24c2 R14: ffff88804fcdc150 R15: 0000000000000000
FS: 000055558f3fe500(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd63fff CR3: 00000000431d7000 CR4: 0000000000352ef0
Call Trace:
<TASK>
ocfs2_block_group_alloc_discontig fs/ocfs2/suballoc.c:634 [inline]
ocfs2_block_group_alloc fs/ocfs2/suballoc.c:703 [inline]
ocfs2_reserve_suballoc_bits+0x20a6/0x4640 fs/ocfs2/suballoc.c:834
ocfs2_reserve_new_inode+0x4f4/0xcc0 fs/ocfs2/suballoc.c:1074
ocfs2_mknod+0x83c/0x2050 fs/ocfs2/namei.c:306
ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:659
vfs_mkdir+0x306/0x510 fs/namei.c:4453
do_mkdirat+0x247/0x590 fs/namei.c:4486
__do_sys_mkdirat fs/namei.c:4503 [inline]
__se_sys_mkdirat fs/namei.c:4501 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501
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: 0033:0x7f3f05d8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdff269308 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f3f05fe5fa0 RCX: 00007f3f05d8efc9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f3f05e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f05fe5fa0 R14: 00007f3f05fe5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_bg_discontig_add_extent fs/ocfs2/suballoc.c:335 [inline]
RIP: 0010:ocfs2_block_group_fill+0x5bd/0xa70 fs/ocfs2/suballoc.c:386
Code: 34 1a 49 81 c6 50 01 00 00 45 0f b7 3f 49 83 c5 02 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 eb 03 00 00 44 89 f8 31 d2 <66> 41 f7 75 00 0f b7 d8 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0
RSP: 0018:ffffc90002b2f080 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888000dba480
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002b2f188 R08: 00313050554f5247 R09: 00313050554f5247
R10: dffffc0000000000 R11: ffffed1009f9b801 R12: dffffc0000000000
R13: ffff88804fcc24c2 R14: ffff88804fcdc150 R15: 0000000000000000
FS: 000055558f3fe500(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd63fff CR3: 00000000431d7000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 34 1a xor $0x1a,%al
2: 49 81 c6 50 01 00 00 add $0x150,%r14
9: 45 0f b7 3f movzwl (%r15),%r15d
d: 49 83 c5 02 add $0x2,%r13
11: 4c 89 e8 mov %r13,%rax
14: 48 c1 e8 03 shr $0x3,%rax
18: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
1d: 84 c0 test %al,%al
1f: 0f 85 eb 03 00 00 jne 0x410
25: 44 89 f8 mov %r15d,%eax
28: 31 d2 xor %edx,%edx
* 2a: 66 41 f7 75 00 divw 0x0(%r13) <-- trapping instruction
2f: 0f b7 d8 movzwl %ax,%ebx
32: 4c 89 f0 mov %r14,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
3e: 84 c0 test %al,%al