Re: /proc/*/maps broken on nommu

[Randy Dunlap]

On 9/17/23 04:38, Max Filippov wrote:
> Hello,
> 
> As of v6.5 cat /proc/*/maps produces empty output on nommu xtensa systems.
> Bisection points to the commit 0c563f148043 ("proc: remove VMA rbtree
> use from nommu").
> It looks like the issue may be not in the m_start (where find_vma(mm,
> addr) returns
> NULL), but in the nommu version of find_vma itself. I've tried replacing nommu
> find_vma implementation with an implementation of the MMU version and it
> fixes the /proc/*/maps output. Kind of (it works as expected on one of
> my systems,
> but consistently locks up on the other).
> 
> Any suggestions of what might be wrong/how to fix it properly?
> 

Hi Max,

There is already a proposed patch and some discussion:

https://lore.kernel.org/lkml/20230915160055.971059-2-ben.wolsieffer@xxxxxxxxxxx/

-- 
~Randy