REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1) REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 5 0x0 SD] (nlink == 1) not found (pos 2) ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x66c/0xa14 fs/reiserfs/lbalance.c:-1 Write of size 4048 at addr ffff0000f1259030 by task syz.0.17/4515 CPU: 0 PID: 4515 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189 memcpy+0x60/0x90 mm/kasan/shadow.c:66 leaf_paste_in_buffer+0x66c/0xa14 fs/reiserfs/lbalance.c:-1 balance_leaf_paste_left_whole fs/reiserfs/do_balan.c:564 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:594 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x2658/0xd2f4 fs/reiserfs/do_balan.c:1409 do_balance+0x260/0x774 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x5b4/0x6d0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1444/0x3524 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x34c/0x13b8 fs/buffer.c:1991 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041 reiserfs_write_begin+0x328/0x71c fs/reiserfs/inode.c:2775 generic_perform_write+0x230/0x4e4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the physical page: page:00000000611e21cc refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131259 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003c49648 fffffc0003c49648 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f1258f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f1258f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000f1259000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000f1259080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f1259100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== REISERFS panic (device loop0): vs-12195 balance_leaf: CFR not initialized ------------[ cut here ]------------ kernel BUG at fs/reiserfs/prints.c:390! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4515 Comm: syz.0.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __reiserfs_panic+0x13c/0x140 fs/reiserfs/prints.c:384 lr : __reiserfs_panic+0x13c/0x140 fs/reiserfs/prints.c:384 sp : ffff8000213164c0 x29: ffff800021316560 x28: ffff800021316d60 x27: ffff800021316d78 x26: ffff0000f124a027 x25: dfff800000000000 x24: ffff800021316f00 x23: ffff8000213164e0 x22: ffff800011b5eba0 x21: ffff0000deb5c000 x20: ffff800011b5eb80 x19: ffff800014770cbe x18: ffff800011a5bd40 x17: 0000000000000040 x16: ffff800008042d90 x15: 0000000000000000 x14: 0000000000000040 x13: 01c51455521e0e00 x12: 0000000000ff0100 x11: ff0080000830b6e8 x10: 0000000000000000 x9 : 01c51455521e0e00 x8 : 01c51455521e0e00 x7 : 0000000000000000 x6 : ffff8000119d0a9c x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000852f9b8 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000049 Call trace: __reiserfs_panic+0x13c/0x140 fs/reiserfs/prints.c:384 balance_leaf+0xa0a8/0xd2f4 fs/reiserfs/do_balan.c:1439 do_balance+0x260/0x774 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x5b4/0x6d0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1444/0x3524 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x34c/0x13b8 fs/buffer.c:1991 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041 reiserfs_write_begin+0x328/0x71c fs/reiserfs/inode.c:2775 generic_perform_write+0x230/0x4e4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: 912d80a5 911aa2a1 aa1303e4 97ffe397 (d4210000) ---[ end trace 0000000000000000 ]---