REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP ================================================================== BUG: KASAN: use-after-free in reiserfs_release_objectid+0x572/0x810 fs/reiserfs/objectid.c:165 Read of size 8188 at addr ffff888059ee4050 by task syz-executor/5765 CPU: 0 PID: 5765 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x241/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 reiserfs_release_objectid+0x572/0x810 fs/reiserfs/objectid.c:165 remove_save_link+0x2b3/0x3e0 fs/reiserfs/super.c:542 reiserfs_evict_inode+0x3b2/0x4c0 fs/reiserfs/inode.c:91 evict+0x4ca/0x8d0 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfe/0x1e0 fs/dcache.c:918 ovl_free_fs+0xf6/0x610 fs/overlayfs/params.c:731 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_anon_super+0x3b/0x70 fs/super.c:1303 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f55a999d9d7 Code: a2 c7 05 1c ed 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd4b52b078 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f55a999d9d7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd4b52b130 RBP: 00007ffd4b52b130 R08: 00007ffd4b52c130 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd4b52c220 R13: 00007f55a9a31f90 R14: 000000000001d7bb R15: 00007ffd4b52d2f0 The buggy address belongs to the physical page: page:ffffea000167b900 refcount:2 mapcount:0 mapping:ffff888148c158f8 index:0x10 pfn:0x59ee4 memcg:ffff888022dd8000 aops:def_blk_aops ino:700003 flags: 0xfff5800002822c(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff5800002822c ffffea0001640488 ffffea0001700048 ffff888148c158f8 raw: 0000000000000010 ffff8880769b1740 00000002ffffffff ffff888022dd8000 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 6392, tgid 6390 (syz.3.105), ts 119587078679, free_ts 119539810497 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581 prep_new_page mm/page_alloc.c:1588 [inline] get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500 folio_alloc+0x1e/0x30 mm/mempolicy.c:2291 filemap_alloc_folio+0xdf/0x490 mm/filemap.c:1004 __filemap_get_folio+0x3ea/0xbb0 mm/filemap.c:1962 grow_dev_page fs/buffer.c:1058 [inline] grow_buffers fs/buffer.c:1118 [inline] __getblk_slow fs/buffer.c:1145 [inline] __getblk_gfp+0x223/0x660 fs/buffer.c:1439 __bread_gfp+0x2a/0x330 fs/buffer.c:1473 sb_bread include/linux/buffer_head.h:326 [inline] read_super_block+0x91/0x7c0 fs/reiserfs/super.c:1604 reiserfs_fill_super+0x7ad/0x23b0 fs/reiserfs/super.c:1966 mount_bdev+0x221/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1181 [inline] free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2504 release_pages+0x1f7a/0x2200 mm/swap.c:1022 tlb_batch_pages_flush mm/mmu_gather.c:99 [inline] tlb_flush_mmu_free mm/mmu_gather.c:294 [inline] tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301 tlb_finish_mmu+0xf9/0x220 mm/mmu_gather.c:425 unmap_region+0x312/0x370 mm/mmap.c:2349 do_vmi_align_munmap+0x10dc/0x16d0 mm/mmap.c:2592 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660 __vm_munmap+0x1a2/0x3c0 mm/mmap.c:2961 __do_sys_munmap mm/mmap.c:2978 [inline] __se_sys_munmap mm/mmap.c:2975 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:2975 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888059ee4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888059ee4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888059ee5000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888059ee5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888059ee5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================