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:1447 [inline]
BUG: KASAN: use-after-free in ocfs2_claim_suballoc_bits+0xb34/0x1e00 fs/ocfs2/suballoc.c:1996
Read of size 4 at addr ffff0000e5619000 by task syz.0.16/7037

CPU: 1 UID: 0 PID: 7037 Comm: syz.0.16 Not tainted 6.15.0-syzkaller-10769-g7d4e49a77d99 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0x8c/0x238 mm/kasan/report.c:408
 print_report+0x50/0x68 mm/kasan/report.c:521
 kasan_report+0xb0/0x110 mm/kasan/report.c:634
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1447 [inline]
 ocfs2_claim_suballoc_bits+0xb34/0x1e00 fs/ocfs2/suballoc.c:1996
 ocfs2_claim_new_inode+0x2f4/0x710 fs/ocfs2/suballoc.c:2292
 ocfs2_mknod_locked+0xfc/0x228 fs/ocfs2/namei.c:634
 ocfs2_mknod+0xe38/0x1cf0 fs/ocfs2/namei.c:381
 ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:656
 vfs_mkdir+0x284/0x424 fs/namei.c:4366
 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
 __do_sys_mkdirat fs/namei.c:4416 [inline]
 __se_sys_mkdirat fs/namei.c:4414 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffab337 pfn:0x125619
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc394d308 fffffdffc3958748 0000000000000000
raw: 0000000ffffab337 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e5618f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000e5618f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e5619000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e5619080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e5619100: 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.0.16,7037,0):ocfs2_search_chain:1817 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_search_chain:1940 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_claim_suballoc_bits:2010 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_claim_suballoc_bits:2063 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_claim_new_inode:2298 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_claim_new_inode:2313 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_mknod_locked:638 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_mknod:385 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_mknod:502 ERROR: status = -30
(syz.0.16,7037,0):ocfs2_mkdir:658 ERROR: status = -30