loop0: detected capacity change from 0 to 32768
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:1391 [inline]
BUG: KASAN: use-after-free in ocfs2_claim_suballoc_bits+0x88c/0x1bfc fs/ocfs2/suballoc.c:1927
Read of size 4 at addr ffff0000e526f000 by task syz-executor223/4314

CPU: 1 PID: 4314 Comm: syz-executor223 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1391 [inline]
 ocfs2_claim_suballoc_bits+0x88c/0x1bfc fs/ocfs2/suballoc.c:1927
 ocfs2_claim_new_inode+0x2e8/0x700 fs/ocfs2/suballoc.c:2210
 ocfs2_mknod_locked+0xfc/0x228 fs/ocfs2/namei.c:635
 ocfs2_mknod+0xe64/0x1f18 fs/ocfs2/namei.c:381
 ocfs2_mkdir+0x19c/0x4f0 fs/ocfs2/namei.c:657
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4106
 do_mkdirat+0x1b4/0x3e0 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:00000000fc2da8a5 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12526f
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003949c08 ffff00019f751e20 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e526ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000e526ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e526f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e526f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e526f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
OCFS2: ERROR (device loop0): int ocfs2_validate_gd_self(struct super_block *, struct buffer_head *, int): Group descriptor #0 has bad signature 
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: File system is now read-only.
(syz-executor223,4314,1):ocfs2_search_chain:1761 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_search_chain:1871 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_claim_suballoc_bits:1940 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_claim_suballoc_bits:1983 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_claim_new_inode:2216 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_claim_new_inode:2231 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_mknod_locked:639 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_mknod:385 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_mknod:502 ERROR: status = -30
(syz-executor223,4314,1):ocfs2_mkdir:659 ERROR: status = -30