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 REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: out-of-bounds in leaf_paste_in_buffer+0x1e7/0xaf0 fs/reiserfs/lbalance.c:1017 Read of size 18446744073709551233 at addr ffff888065d4f000 by task syz-executor.0/4479 CPU: 0 PID: 4479 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x250 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+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 leaf_paste_in_buffer+0x1e7/0xaf0 fs/reiserfs/lbalance.c:1017 balance_leaf_new_nodes_paste_whole fs/reiserfs/do_balan.c:1171 [inline] balance_leaf_new_nodes_paste fs/reiserfs/do_balan.c:1215 [inline] balance_leaf_new_nodes fs/reiserfs/do_balan.c:1246 [inline] balance_leaf+0x748f/0x10ec0 fs/reiserfs/do_balan.c:1450 do_balance+0x318/0x930 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x744/0x7f0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1c3d/0x4360 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012 reiserfs_write_begin+0x353/0x820 fs/reiserfs/inode.c:2790 generic_cont_expand_simple+0xf0/0x1a0 fs/buffer.c:2362 reiserfs_setattr+0x3f5/0x10d0 fs/reiserfs/inode.c:3319 notify_change+0xbc6/0xee0 fs/attr.c:505 do_truncate+0x1ac/0x240 fs/open.c:65 do_sys_ftruncate+0x31b/0x3d0 fs/open.c:193 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: 0033:0x7f4e9c933079 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 d0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4e9bcc40b8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007f4e9ca71f80 RCX: 00007f4e9c933079 RDX: 0000000000000000 RSI: 0000000002007fff RDI: 0000000000000005 RBP: 00007f4e9c994498 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4e9ca71f80 R15: 00007ffd8e4c9288 The buggy address belongs to the page: page:ffffea00019753c0 refcount:1 mapcount:1 mapping:0000000000000000 index:0x7f4e9ca6e pfn:0x65d4f memcg:ffff8880197b8000 anon flags: 0xfff00000080014(uptodate|lru|swapbacked|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000080014 ffffea000198cb88 ffff88807786c000 ffff88802c2cc221 raw: 00000007f4e9ca6e 0000000000000000 0000000100000000 ffff8880197b8000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x1100cca(GFP_HIGHUSER_MOVABLE), pid 4477, ts 69016846376, free_ts 15733787878 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_pages_vma+0x2bc/0x790 mm/mempolicy.c:2146 wp_page_copy+0x252/0x2090 mm/memory.c:3056 handle_pte_fault mm/memory.c:4668 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1fbd/0x4440 mm/memory.c:4883 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355 handle_page_fault arch/x86/mm/fault.c:1443 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 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+0x8f/0x2a0 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9428 destroy_args+0xef/0xa00 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x272/0x730 init/main.c:1315 do_initcall_level+0x13d/0x1f0 init/main.c:1388 do_initcalls+0x4b/0x90 init/main.c:1404 kernel_init_freeable+0x3d5/0x560 init/main.c:1628 kernel_init+0x19/0x1b0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888065d4ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888065d4ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888065d4f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888065d4f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888065d4f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================