Re: [PATCH 0/3] mm/vmalloc: fix vmalloc_dump_obj VA lookup

[Andrew Morton]

On Wed, 16 Sep 2026 16:25:27 +0800 Ye Liu <ye.liu@xxxxxxxxx> wrote:

> vmalloc_dump_obj() has two bugs that cause it to miss vmalloc
> allocations, plus a minor optimization opportunity:
> 
>   1. PAGE_ALIGN() rounds up, pushing last-page addresses to va_end
>      and outside the VA lookup range.
> 
>   2. The function searches only one vmap node, but allocations
>      larger than 64 KiB may span multiple vmap zones whose VA
>      is stored in a different node's rb-tree.
> 
> Patch 1 fixes the alignment, patch 2 fixes the cross-zone search,
> patch 3 adds an early is_vmalloc_addr() check to skip non-vmalloc
> addresses without traversing all nodes.
> 

Thanks.  Sashiko asked a thing:
	https://sashiko.dev/#/patchset/20260916-vmalloc_dump_obj-v1-0-7aa402d224df@xxxxxxxxx