REISERFS (device loop0): journal params: device loop0, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 0, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
==================================================================
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+0x776/0x980 fs/reiserfs/namei.c:164
Read of size 4 at addr ffff888032f21014 by task syz-executor.0/5890

CPU: 0 PID: 5890 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x9a/0xcc lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x776/0x980 fs/reiserfs/namei.c:164
 reiserfs_find_entry.part.0+0x133/0xcb0 fs/reiserfs/namei.c:321
 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline]
 reiserfs_lookup+0x1ff/0x3e0 fs/reiserfs/namei.c:367
 __lookup_slow+0x1fe/0x3c0 fs/namei.c:1544
 lookup_one_len+0x11f/0x150 fs/namei.c:2565
 reiserfs_lookup_privroot+0x8d/0x260 fs/reiserfs/xattr.c:979
 reiserfs_fill_super+0x1c20/0x2670 fs/reiserfs/super.c:2176
 mount_bdev+0x2cb/0x3b0 fs/super.c:1366
 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:592
 vfs_get_tree+0x7f/0x2c0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x7f3/0x1b30 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3409
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f06c590863a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 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:00007f06c507bf88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 00007f06c590863a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f06c507bfe0
RBP: 00007f06c507c020 R08: 00007f06c507c020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f06c507bfe0 R15: 0000000020000580

The buggy address belongs to the page:
page:00000000a51ceb13 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x32f21
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea0000cbc888 ffff8880b9e56068 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 9, migratetype Movable, gfp_mask 0x3d24ca(GFP_TRANSHUGE|__GFP_NORETRY|__GFP_THISNODE), pid 5321, ts 30982313698
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x144/0x1c0 mm/page_alloc.c:2297
 prep_new_page mm/page_alloc.c:2306 [inline]
 get_page_from_freelist+0x1c6e/0x3f80 mm/page_alloc.c:3945
 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4995
 __alloc_pages include/linux/gfp.h:511 [inline]
 __alloc_pages_node include/linux/gfp.h:524 [inline]
 alloc_pages_vma+0x44f/0x5d0 mm/mempolicy.c:2211
 do_huge_pmd_anonymous_page+0x2b5/0x1c70 mm/huge_memory.c:761
 create_huge_pmd mm/memory.c:4269 [inline]
 __handle_mm_fault mm/memory.c:4493 [inline]
 handle_mm_fault+0x2620/0x4520 mm/memory.c:4620
 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393
 handle_page_fault arch/x86/mm/fault.c:1450 [inline]
 exc_page_fault+0x60/0xc0 arch/x86/mm/fault.c:1506
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1271 [inline]
 __free_pages_ok+0x4da/0xed0 mm/page_alloc.c:1536
 release_pages+0x4b7/0x1400 mm/swap.c:909
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu mm/mmu_gather.c:249 [inline]
 tlb_finish_mmu+0x127/0x790 mm/mmu_gather.c:328
 exit_mmap+0x265/0x4c0 mm/mmap.c:3222
 __mmput+0xeb/0x3e0 kernel/fork.c:1082
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0x9e9/0x2570 kernel/exit.c:812
 do_group_exit+0xe7/0x290 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x35/0x40 kernel/exit.c:931
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Memory state around the buggy address:
 ffff888032f20f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888032f20f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888032f21000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff888032f21080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888032f21100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================