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

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Message-ID: <CAOUHufaxubu3_Ee-G8q3o02fkRoTf6M7-5=85_B_PUtsWbNa8Q@mail.gmail.com>
Date:   Sat, 16 Jul 2022 23:57:18 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Liam Howlett <liam.howlett@...cle.com>
Cc:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH v11 00/69] Introducing the Maple Tree

On Sat, Jul 16, 2022 at 10:20 PM Andrew Morton
<akpm@...ux-foundation.org> wrote:
>
> On Sun, 17 Jul 2022 02:46:32 +0000 Liam Howlett <liam.howlett@...cle.com> 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