REISERFS warning:  read_super_block: reiserfs filesystem is deprecated and scheduled to be removed from the kernel in 2025
REISERFS (device loop0): found reiserfs format "3.5" with non-standard journal
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
BUG: KASAN: use-after-free in search_by_entry_key+0x80a/0x940 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff888071eaf004 by task syz-executor101/5033

CPU: 0 PID: 5033 Comm: syz-executor101 Not tainted 6.5.0-rc3-next-20230728-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x80a/0x940 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x1dc/0xe70 fs/reiserfs/namei.c:322
 reiserfs_lookup+0x1f5/0x690 fs/reiserfs/namei.c:368
 __lookup_slow+0x24d/0x450 fs/namei.c:1690
 lookup_one_len+0x17d/0x1b0 fs/namei.c:2742
 reiserfs_lookup_privroot+0x94/0x200 fs/reiserfs/xattr.c:977
 reiserfs_fill_super+0x1ab6/0x3150 fs/reiserfs/super.c:2192
 mount_bdev+0x1f3/0x350 fs/super.c:1398
 legacy_get_tree+0x109/0x220 fs/fs_context.c:611
 vfs_get_tree+0x88/0x350 fs/super.c:1521
 do_new_mount fs/namespace.c:3335 [inline]
 path_mount+0x1492/0x1ed0 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff90ec32aaa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 3e 07 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc6fc44eb8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc6fc44ec0 RCX: 00007ff90ec32aaa
RDX: 0000000020000140 RSI: 0000000020000340 RDI: 00007ffc6fc44ec0
RBP: 0000000000000004 R08: 00007ffc6fc44f00 R09: 000000000000111a
R10: 000000000120c083 R11: 0000000000000286 R12: 00007ffc6fc44f00
R13: 0000000000000003 R14: 0000000000400000 R15: 0000000000000001
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c7abc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x71eaf
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0001c7ac08 ffff8880b98435a0 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 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 24956269710, free_ts 25984781224
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1569
 split_map_pages+0x1ff/0x520 mm/compaction.c:97
 isolate_freepages_range+0x31e/0x380 mm/compaction.c:774
 alloc_contig_range+0x32e/0x510 mm/page_alloc.c:6302
 __alloc_contig_pages mm/page_alloc.c:6325 [inline]
 alloc_contig_pages+0x30c/0x600 mm/page_alloc.c:6405
 debug_vm_pgtable_alloc_huge_page mm/debug_vm_pgtable.c:1095 [inline]
 init_args mm/debug_vm_pgtable.c:1277 [inline]
 debug_vm_pgtable+0x955/0x4090 mm/debug_vm_pgtable.c:1315
 do_one_initcall+0x117/0x630 init/main.c:1241
 do_initcall_level init/main.c:1303 [inline]
 do_initcalls init/main.c:1319 [inline]
 do_basic_setup init/main.c:1338 [inline]
 kernel_init_freeable+0x5bd/0x8f0 init/main.c:1555
 kernel_init+0x1c/0x2a0 init/main.c:1446
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1160 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2383
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2478
 free_contig_range+0xb6/0x190 mm/page_alloc.c:6427
 destroy_args+0x686/0x940 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x2363/0x4090 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x117/0x630 init/main.c:1241
 do_initcall_level init/main.c:1303 [inline]
 do_initcalls init/main.c:1319 [inline]
 do_basic_setup init/main.c:1338 [inline]
 kernel_init_freeable+0x5bd/0x8f0 init/main.c:1555
 kernel_init+0x1c/0x2a0 init/main.c:1446
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

Memory state around the buggy address:
 ffff888071eaef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888071eaef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888071eaf000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888071eaf080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888071eaf100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================