REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x615/0xab0 fs/reiserfs/lbalance.c:-1 Write of size 480 at addr ffff888071f2ce20 by task syz.2.271/5130 CPU: 0 PID: 5130 Comm: syz.2.271 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 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 leaf_paste_in_buffer+0x615/0xab0 fs/reiserfs/lbalance.c:-1 leaf_copy_boundary_item+0xc75/0x2190 fs/reiserfs/lbalance.c:199 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0x85f/0xe00 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xb9/0x450 fs/reiserfs/lbalance.c:750 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x2c21/0x10ec0 fs/reiserfs/do_balan.c:1409 do_balance+0x318/0x930 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x6dd/0x810 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1c3a/0x42a0 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012 reiserfs_write_begin+0x34b/0x810 fs/reiserfs/inode.c:2790 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x240/0x3a0 fs/read_write.c:1025 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: 0033:0x7f15a0a68e59 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:00007f159ecc2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f15a0ce1fa0 RCX: 00007f15a0a68e59 RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000005 RBP: 00007f15a0afed6f R08: 0000000000000009 R09: 0000000000000004 R10: 0000000000800fff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f15a0ce2038 R14: 00007f15a0ce1fa0 R15: 00007ffc9808b598 The buggy address belongs to the page: page:ffffea0001c7cb00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x71f2c flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001c7c8c8 ffffea0001c7ca08 0000000000000000 raw: 0000000000000001 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 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 5140, ts 110803243084, free_ts 110845635445 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146 wp_page_copy+0x21e/0x2050 mm/memory.c:3051 handle_pte_fault mm/memory.c:4668 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1f06/0x4410 mm/memory.c:4883 do_user_addr_fault+0x489/0xc80 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_list+0x119/0x820 mm/page_alloc.c:3433 release_pages+0x186c/0x1be0 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:241 [inline] tlb_flush_mmu mm/mmu_gather.c:248 [inline] tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371 exit_mmap+0x3d0/0x640 mm/mmap.c:3218 __mmput+0x115/0x3b0 kernel/fork.c:1127 exit_mm+0x5f7/0x770 kernel/exit.c:551 do_exit+0x5a9/0x20c0 kernel/exit.c:871 do_group_exit+0x12e/0x300 kernel/exit.c:998 get_signal+0x6d6/0x12d0 kernel/signal.c:2900 arch_do_signal_or_restart+0xe7/0x12c0 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 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888071f2cd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888071f2cd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888071f2ce00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888071f2ce80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888071f2cf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================