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+0x529/0x7a0 fs/reiserfs/objectid.c:165 Read of size 8188 at addr ffff8880518ce050 by task syz.0.184/5064 CPU: 0 PID: 5064 Comm: syz.0.184 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 reiserfs_release_objectid+0x529/0x7a0 fs/reiserfs/objectid.c:165 remove_save_link+0x2af/0x3e0 fs/reiserfs/super.c:542 reiserfs_evict_inode+0x3a8/0x4b0 fs/reiserfs/inode.c:91 evict+0x4b6/0x8b0 fs/inode.c:705 do_unlinkat+0x388/0x580 fs/namei.c:4405 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __x64_sys_unlinkat+0xd1/0xe0 fs/namei.c:4434 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f452699e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f452781e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007f4526c25fa0 RCX: 00007f452699e019 RDX: 0000000000000000 RSI: 0000200000000380 RDI: ffffffffffffff9c RBP: 00007f4526a3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4526c26038 R14: 00007f4526c25fa0 R15: 00007fff0bac2778 The buggy address belongs to the physical page: page:ffffea0001463380 refcount:2 mapcount:0 mapping:ffff888017883f00 index:0x10 pfn:0x518ce memcg:ffff888079408000 aops:def_blk_aops ino:700000 flags: 0xfff58000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff58000022056 ffffea0001463348 ffffea0001c53a88 ffff888017883f00 raw: 0000000000000010 ffff8880543fb658 00000002ffffffff ffff888079408000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5064, tgid 5061 (syz.0.184), ts 147645476209, free_ts 144895879446 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x480 mm/filemap.c:999 __filemap_get_folio+0x6ba/0xde0 mm/filemap.c:1993 pagecache_get_page+0x26/0x260 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:648 [inline] grow_dev_page fs/buffer.c:946 [inline] grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x2a0/0xa80 fs/buffer.c:1333 __bread_gfp+0x26/0x330 fs/buffer.c:1367 sb_bread include/linux/buffer_head.h:338 [inline] read_super_block+0x9e/0x7f0 fs/reiserfs/super.c:1604 reiserfs_fill_super+0x73e/0x20e0 fs/reiserfs/super.c:1966 mount_bdev+0x28a/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555 release_pages+0x20d1/0x2340 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x808/0x21d0 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x225/0x9f0 mm/shmem.c:1171 evict+0x4b6/0x8b0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x597/0x8b0 fs/file_table.c:328 task_work_run+0x1d0/0x260 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x9d5/0x2570 kernel/exit.c:887 do_group_exit+0x229/0x2e0 kernel/exit.c:1030 get_signal+0x1259/0x1340 kernel/signal.c:2880 arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871 Memory state around the buggy address: ffff8880518cff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880518cff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880518d0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880518d0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880518d0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================