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ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: use-after-free in ocfs2_match fs/ocfs2/dir.c:334 [inline]
BUG: KASAN: use-after-free in ocfs2_search_dirblock+0x267/0x7f0 fs/ocfs2/dir.c:367
Read of size 1 at addr ffff88806cf2d964 by task syz.0.16/5039

CPU: 0 PID: 5039 Comm: syz.0.16 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 ocfs2_match fs/ocfs2/dir.c:334 [inline]
 ocfs2_search_dirblock+0x267/0x7f0 fs/ocfs2/dir.c:367
 ocfs2_find_entry_id fs/ocfs2/dir.c:414 [inline]
 ocfs2_find_entry+0x114b/0x26d0 fs/ocfs2/dir.c:1078
 ocfs2_find_files_on_disk+0xea/0x310 fs/ocfs2/dir.c:1982
 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2004
 ocfs2_lookup+0x27b/0x9f0 fs/ocfs2/namei.c:122
 lookup_one_qstr_excl+0x117/0x240 fs/namei.c:1563
 filename_create+0x293/0x530 fs/namei.c:3836
 do_mkdirat+0xb3/0x520 fs/namei.c:4080
 __do_sys_mkdir fs/namei.c:4110 [inline]
 __se_sys_mkdir fs/namei.c:4108 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4108
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fcd765efda9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcd75861038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fcd76808fa0 RCX: 00007fcd765efda9
RDX: 0000000000000000 RSI: 0000000000000044 RDI: 0000000020000180
RBP: 00007fcd766712a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcd76808fa0 R15: 00007ffd06f63b08
 </TASK>

The buggy address belongs to the page:
page:ffffea0001b3cb40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6cf2d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001b30d08 ffffea0001abc548 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 3836, ts 85045519160, free_ts 116602420945
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5465
 alloc_pages_vma+0x39a/0x800 mm/mempolicy.c:2146
 do_anonymous_page mm/memory.c:3836 [inline]
 handle_pte_fault mm/memory.c:4646 [inline]
 __handle_mm_fault mm/memory.c:4783 [inline]
 handle_mm_fault+0x2f49/0x5960 mm/memory.c:4881
 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline]
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433
 release_pages+0x1bb9/0x1f40 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:338
 unmap_region+0x304/0x350 mm/mmap.c:2657
 __do_munmap+0x130a/0x1710 mm/mmap.c:2887
 __do_sys_brk mm/mmap.c:254 [inline]
 __se_sys_brk+0x45a/0x6d0 mm/mmap.c:193
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff88806cf2d800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806cf2d880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806cf2d900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff88806cf2d980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806cf2da00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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