loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
ocfs2: Slot 0 on device (7,0) was already allocated to this node!
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1443!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5340 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~bpo12+1 04/01/2014
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x241f/0x2430 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 e2 99 11 fe 90 0f 0b e8 da 99 11 fe 90 0f 0b e8 d2 99 11 fe 90 0f 0b e8 ca 99 11 fe 90 0f 0b e8 c2 99 11 fe 90 <0f> 0b e8 ba 99 11 fe 90 0f 0b 0f 1f 80 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc9000d53f260 EFLAGS: 00010283
RAX: ffffffff83af5cce RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000002e7b RDI: 0000000000002e7c
RBP: ffffc9000d53f4f0 R08: ffffc9000d53f580 R09: 0000000000000000
R10: ffffc9000d53f580 R11: fffff52001aa7eb5 R12: ffff88800b551308
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff110016aa261
FS:  00007ffafe1b26c0(0000) GS:ffff88808d6ba000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20c0311380 CR3: 000000001253a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_claim_new_inode+0x332/0x7a0 fs/ocfs2/suballoc.c:2292
 ocfs2_mknod_locked+0x100/0x250 fs/ocfs2/namei.c:637
 ocfs2_mknod+0x10a5/0x2030 fs/ocfs2/namei.c:384
 ocfs2_mkdir+0x181/0x420 fs/ocfs2/namei.c:659
 vfs_mkdir+0x512/0x5b0 fs/namei.c:5130
 do_mkdirat+0x276/0x4b0 fs/namei.c:5164
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffafd38df17
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007ffafe1b1e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffafe1b1ef0 RCX: 00007ffafd38df17
RDX: 00000000000001ff RSI: 0000200000000680 RDI: 00000000ffffff9c
RBP: 0000200000000080 R08: 0000200000000d40 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000200000000680
R13: 00007ffafe1b1eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x241f/0x2430 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 e2 99 11 fe 90 0f 0b e8 da 99 11 fe 90 0f 0b e8 d2 99 11 fe 90 0f 0b e8 ca 99 11 fe 90 0f 0b e8 c2 99 11 fe 90 <0f> 0b e8 ba 99 11 fe 90 0f 0b 0f 1f 80 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc9000d53f260 EFLAGS: 00010283
RAX: ffffffff83af5cce RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000002e7b RDI: 0000000000002e7c
RBP: ffffc9000d53f4f0 R08: ffffc9000d53f580 R09: 0000000000000000
R10: ffffc9000d53f580 R11: fffff52001aa7eb5 R12: ffff88800b551308
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff110016aa261
FS:  00007ffafe1b26c0(0000) GS:ffff88808d6ba000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a49e56dc78 CR3: 000000001253a000 CR4: 0000000000352ef0