loop0: detected capacity change from 0 to 32768
ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback 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 ffff000100d69000 by task syz.0.345/8306

CPU: 0 UID: 0 PID: 8306 Comm: syz.0.345 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __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:637
 ocfs2_mknod+0xe38/0x1cf0 fs/ocfs2/namei.c:384
 ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x12d8/0x2c40 fs/namei.c:4043
 do_filp_open+0x18c/0x36c fs/namei.c:4073
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1461
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1d8b pfn:0x140d69
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc3c797c8 fffffdffc3e79008 0000000000000000
raw: 0000000000001d8b 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000100d68f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff000100d68f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff000100d69000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff000100d69080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff000100d69100: 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.0.345,8306,0):ocfs2_search_chain:1817 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_search_chain:1940 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_claim_suballoc_bits:2010 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_claim_suballoc_bits:2063 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_claim_new_inode:2298 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_claim_new_inode:2313 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_mknod_locked:641 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_mknod:388 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_mknod:505 ERROR: status = -30
(syz.0.345,8306,0):ocfs2_create:678 ERROR: status = -30