REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 UNKNOWN] (nlink == 1) not found (pos 2) REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP ================================================================== BUG: KASAN: use-after-free in reiserfs_release_objectid+0x521/0x780 fs/reiserfs/objectid.c:165 Read of size 8188 at addr ffff88805a771050 by task syz.0.35/4438 CPU: 1 PID: 4438 Comm: syz.0.35 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 reiserfs_release_objectid+0x521/0x780 fs/reiserfs/objectid.c:165 remove_save_link+0x2b6/0x3c0 fs/reiserfs/super.c:542 reiserfs_evict_inode+0x393/0x490 fs/reiserfs/inode.c:91 evict+0x485/0x870 fs/inode.c:647 do_unlinkat+0x3d8/0x6f0 fs/namei.c:4355 __do_sys_unlinkat fs/namei.c:4391 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xd1/0xe0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f14f8e0fec9 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:00007f14f7056038 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007f14f9067090 RCX: 00007f14f8e0fec9 RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007f14f8e92f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f14f9067128 R14: 00007f14f9067090 R15: 00007ffd8ec99e78 The buggy address belongs to the page: page:ffffea000169dc40 refcount:2 mapcount:0 mapping:ffff888145fe4f30 index:0x10 pfn:0x5a771 memcg:ffff88807edac000 aops:def_blk_aops ino:700000 flags: 0xfff00000022036(referenced|uptodate|lru|active|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000022036 ffffea00017512c8 ffffea0001cb9248 ffff888145fe4f30 raw: 0000000000000010 ffff8880757e9570 00000002ffffffff ffff88807edac000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 4426, ts 77372173124, free_ts 77367643838 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 __page_cache_alloc+0xd2/0x3f0 mm/filemap.c:1022 pagecache_get_page+0x986/0xef0 mm/filemap.c:1940 find_or_create_page include/linux/pagemap.h:420 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x249/0xb70 fs/buffer.c:1336 __bread_gfp+0x28/0x380 fs/buffer.c:1381 sb_bread include/linux/buffer_head.h:337 [inline] read_super_block+0x91/0x7a0 fs/reiserfs/super.c:1606 reiserfs_fill_super+0x787/0x23e0 fs/reiserfs/super.c:1968 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3025 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433 release_pages+0x184b/0x1bb0 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+0xc5/0x170 mm/mmu_gather.c:247 zap_pte_range mm/memory.c:1456 [inline] zap_pmd_range mm/memory.c:1505 [inline] zap_pud_range mm/memory.c:1534 [inline] zap_p4d_range mm/memory.c:1555 [inline] unmap_page_range+0x2096/0x2520 mm/memory.c:1576 unmap_vmas+0x11b/0x230 mm/memory.c:1653 exit_mmap+0x38f/0x5f0 mm/mmap.c:3216 __mmput+0x115/0x3b0 kernel/fork.c:1127 exit_mm+0x567/0x6c0 kernel/exit.c:550 do_exit+0x5a1/0x20a0 kernel/exit.c:870 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 Memory state around the buggy address: ffff88805a771f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805a771f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805a772000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805a772080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805a772100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================