Re: [PATCH v11 00/69] Introducing the Maple Tree

[Yu Zhao]

On Sat, Jul 16, 2022 at 10:20 PM Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Sun, 17 Jul 2022 02:46:32 +0000 Liam Howlett <liam.howlett@xxxxxxxxxx> wrote:
...
>         gap = mas.index;
>         gap += (info->align_offset - gap) & info->align_mask;
> -       VM_BUG_ON(gap + info->length > info->high_limit);
> -       VM_BUG_ON(gap + info->length > mas.last);

These VM_BUG_ONs are new, and I hit the second one quickly:

  kernel BUG at mm/mmap.c:1631!
  RIP: 0010:vm_unmapped_area+0xdb/0x1c0
  Call Trace:
   <TASK>
   arch_get_unmapped_area+0x1ee/0x220
   arch_get_unmapped_area_topdown+0x25a/0x290
   get_unmapped_area+0x92/0x100
   do_mmap+0x13f/0x560
   vm_mmap_pgoff+0xcd/0x170