ocfs2: Mounting device (7,6) 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+0x950/0x1e0c fs/ocfs2/suballoc.c:1982
Read of size 4 at addr ffff0000ffcc8000 by task syz.6.114/7546

CPU: 0 UID: 0 PID: 7546 Comm: syz.6.114 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0
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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x198/0x550 mm/kasan/report.c:521
 kasan_report+0xd8/0x138 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:1445 [inline]
 ocfs2_claim_suballoc_bits+0x950/0x1e0c fs/ocfs2/suballoc.c:1982
 __ocfs2_claim_clusters+0x2a0/0x8a8 fs/ocfs2/suballoc.c:2395
 ocfs2_claim_clusters fs/ocfs2/suballoc.c:2432 [inline]
 ocfs2_block_group_alloc_contig fs/ocfs2/suballoc.c:432 [inline]
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:699 [inline]
 ocfs2_reserve_suballoc_bits+0xd44/0x4254 fs/ocfs2/suballoc.c:832
 ocfs2_reserve_new_metadata_blocks+0x384/0x848 fs/ocfs2/suballoc.c:982
 ocfs2_mknod+0xdc8/0x2438 fs/ocfs2/namei.c:347
 ocfs2_create+0x194/0x4d4 fs/ocfs2/namei.c:673
 lookup_open fs/namei.c:3651 [inline]
 open_last_lookups fs/namei.c:3750 [inline]
 path_openat+0x13ec/0x2b1c fs/namei.c:3986
 do_filp_open+0x1e8/0x404 fs/namei.c:4016
 do_sys_openat2+0x124/0x1b8 fs/open.c:1428
 do_sys_open fs/open.c:1443 [inline]
 __do_sys_openat fs/open.c:1459 [inline]
 __se_sys_openat fs/open.c:1454 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454
 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 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:0xffff7f64a pfn:0x13fcc8
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc3ed38c8 fffffdffc3ff3248 0000000000000000
raw: 0000000ffff7f64a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ffcc7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000ffcc7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000ffcc8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff0000ffcc8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000ffcc8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
OCFS2: ERROR (device loop6): 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: Returning error to the calling process.
(syz.6.114,7546,1):ocfs2_search_chain:1814 ERROR: status = -5
(syz.6.114,7546,1):ocfs2_search_chain:1926 ERROR: status = -5
(syz.6.114,7546,1):ocfs2_claim_suballoc_bits:1995 ERROR: status = -5
(syz.6.114,7546,1):ocfs2_claim_suballoc_bits:2038 ERROR: status = -5
(syz.6.114,7546,0):__ocfs2_claim_clusters:2412 ERROR: status = -5
(syz.6.114,7546,0):__ocfs2_claim_clusters:2420 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_block_group_alloc_contig:437 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_block_group_alloc:709 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_block_group_alloc:762 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_reserve_suballoc_bits:837 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_reserve_suballoc_bits:854 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_reserve_new_metadata_blocks:994 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_reserve_new_metadata_blocks:1017 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_mknod:350 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_mknod:502 ERROR: status = -5
(syz.6.114,7546,0):ocfs2_create:675 ERROR: status = -5