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: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: use-after-free in ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1445 [inline]
BUG: KASAN: use-after-free in ocfs2_claim_suballoc_bits+0x10d3/0x2570 fs/ocfs2/suballoc.c:1982
Read of size 4 at addr ffff8880511fe000 by task syz.0.0/5323

CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1445 [inline]
 ocfs2_claim_suballoc_bits+0x10d3/0x2570 fs/ocfs2/suballoc.c:1982
 ocfs2_claim_new_inode+0x338/0x870 fs/ocfs2/suballoc.c:2267
 ocfs2_mknod_locked+0x17a/0x3b0 fs/ocfs2/namei.c:633
 ocfs2_mknod+0x17d4/0x2b40 fs/ocfs2/namei.c:379
 vfs_mknod+0x36d/0x3b0 fs/namei.c:4135
 do_mknodat+0x3ec/0x5b0
 __do_sys_mknodat fs/namei.c:4213 [inline]
 __se_sys_mknodat fs/namei.c:4210 [inline]
 __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4210
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f500557e719
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:00007f50063fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f5005735f80 RCX: 00007f500557e719
RDX: f0b9ce0949ff22d3 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f50055f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000701 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5005735f80 R15: 00007ffe178f8c48
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x511fe
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 ffffea0001447fc8 ffff88801fc44cb0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff8880511fdf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880511fdf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880511fe000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880511fe080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880511fe100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================