REISERFS (device loop0): journal params: device ram0, size 127, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (ram0)
==================================================================
BUG: KASAN: use-after-free in init_inode fs/reiserfs/inode.c:1314 [inline]
BUG: KASAN: use-after-free in reiserfs_read_locked_inode+0x20ec/0x2170 fs/reiserfs/inode.c:1560
Read of size 4 at addr ffff8880754bd000 by task syz.0.8/5361

CPU: 0 UID: 0 PID: 5361 Comm: syz.0.8 Not tainted 6.12.0-rc1-syzkaller-00381-g2a130b7e1fcd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 init_inode fs/reiserfs/inode.c:1314 [inline]
 reiserfs_read_locked_inode+0x20ec/0x2170 fs/reiserfs/inode.c:1560
 reiserfs_fill_super+0x135e/0x31a0 fs/reiserfs/super.c:2070
 mount_bdev+0x1e6/0x2d0 fs/super.c:1679
 legacy_get_tree+0x10c/0x220 fs/fs_context.c:662
 vfs_get_tree+0x92/0x380 fs/super.c:1800
 do_new_mount fs/namespace.c:3507 [inline]
 path_mount+0x14e6/0x1f20 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount fs/namespace.c:4032 [inline]
 __x64_sys_mount+0x294/0x320 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f42b7f79a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2f438f4e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2f438f4ef0 RCX: 00007f2f42b7f79a
RDX: 0000000020001100 RSI: 0000000020001140 RDI: 00007f2f438f4eb0
RBP: 0000000020001100 R08: 00007f2f438f4ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020001140
R13: 00007f2f438f4eb0 R14: 00000000000010e8 R15: 0000000020001180
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7fc50c929 pfn:0x754bd
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d52f88 ffff8880b8644f30 0000000000000000
raw: 00000007fc50c929 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 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5222, tgid 5222 (syz-executor), ts 68962137643, free_ts 74748431333
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x223/0x25c0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
 folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2283
 vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2314
 folio_prealloc mm/memory.c:1062 [inline]
 alloc_anon_folio mm/memory.c:4721 [inline]
 do_anonymous_page mm/memory.c:4778 [inline]
 do_pte_missing+0x2010/0x3e50 mm/memory.c:3963
 handle_pte_fault mm/memory.c:5751 [inline]
 __handle_mm_fault+0x100a/0x2a10 mm/memory.c:5894
 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6062
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 5222 tgid 5222 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_folios+0x956/0x1310 mm/page_alloc.c:2686
 folios_put_refs+0x551/0x750 mm/swap.c:1007
 free_pages_and_swap_cache+0x36d/0x510 mm/swap_state.c:332
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu mm/mmu_gather.c:373 [inline]
 tlb_finish_mmu+0x168/0x7b0 mm/mmu_gather.c:465
 vms_clear_ptes+0x565/0x780 mm/vma.c:1096
 vms_complete_munmap_vmas+0x1d0/0x9a0 mm/vma.c:1140
 do_vmi_align_munmap+0x61b/0x890 mm/vma.c:1349
 do_vmi_munmap+0x20b/0x3e0 mm/vma.c:1397
 __vm_munmap+0x14f/0x340 mm/mmap.c:1600
 __do_sys_munmap mm/mmap.c:1617 [inline]
 __se_sys_munmap mm/mmap.c:1614 [inline]
 __x64_sys_munmap+0x61/0x90 mm/mmap.c:1614
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880754bcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880754bcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880754bd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880754bd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880754bd100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning (device loop0): vs-13075 reiserfs_read_locked_inode: dead inode read from disk [1 2 0x0 SD]. This is likely to be race with knfsd. Ignore
REISERFS warning (device loop0):  reiserfs_fill_super: corrupt root inode, run fsck