loop9: detected capacity change from 0 to 32768
ocfs2: Mounting device (7,9) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: use-after-free in ocfs2_find_smallest_chain fs/ocfs2/suballoc.c:413 [inline]
BUG: KASAN: use-after-free in ocfs2_block_group_alloc_contig fs/ocfs2/suballoc.c:430 [inline]
BUG: KASAN: use-after-free in ocfs2_block_group_alloc fs/ocfs2/suballoc.c:699 [inline]
BUG: KASAN: use-after-free in ocfs2_reserve_suballoc_bits+0xb28/0x3b9c fs/ocfs2/suballoc.c:834
Read of size 4 at addr ffff000100571004 by task syz.9.310/8964

CPU: 1 UID: 0 PID: 8964 Comm: syz.9.310 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_smallest_chain fs/ocfs2/suballoc.c:413 [inline]
 ocfs2_block_group_alloc_contig fs/ocfs2/suballoc.c:430 [inline]
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:699 [inline]
 ocfs2_reserve_suballoc_bits+0xb28/0x3b9c fs/ocfs2/suballoc.c:834
 ocfs2_reserve_new_metadata_blocks+0x368/0x810 fs/ocfs2/suballoc.c:984
 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2845 [inline]
 ocfs2_extend_dir+0x970/0x3964 fs/ocfs2/dir.c:3207
 ocfs2_prepare_dir_for_insert+0x281c/0x4664 fs/ocfs2/dir.c:4312
 ocfs2_symlink+0x62c/0x1ff8 fs/ocfs2/namei.c:1875
 vfs_symlink+0x138/0x288 fs/namei.c:4817
 do_symlinkat+0x17c/0x360 fs/namei.c:4843
 __do_sys_symlinkat fs/namei.c:4859 [inline]
 __se_sys_symlinkat fs/namei.c:4856 [inline]
 __arm64_sys_symlinkat+0x9c/0xb4 fs/namei.c:4856
 __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:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 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:0x569 pfn:0x140571
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc4015c88 fffffdffc38cc9c8 0000000000000000
raw: 0000000000000569 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000100570f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff000100570f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff000100571000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff000100571080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff000100571100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
OCFS2: ERROR (device loop9): 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.9.310,8964,1):ocfs2_search_chain:1817 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_search_chain:1940 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_claim_suballoc_bits:2010 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_claim_suballoc_bits:2063 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_claim_metadata:2088 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_claim_metadata:2101 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_dx_dir_attach_index:2336 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_expand_inline_dir:3029 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_extend_dir:3211 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_prepare_dir_for_insert:4316 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_symlink:1879 ERROR: status = -30
(syz.9.310,8964,1):ocfs2_symlink:2080 ERROR: status = -30