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Re: PCI arbiter crash on last qemu image

From: Damien Zammit
Subject: Re: PCI arbiter crash on last qemu image
Date: Mon, 17 Aug 2020 09:51:26 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0

Hi there,

On 17/8/20 1:04 am, Joan Lledó wrote:
> I found the same issue, investigating a bit more I found that in
> func_files.c:201[1], the value of region->memory is 0x0, so reading from
> there raises a segfault. That pointer should be filled in libpciacces,
> at x86_pci.c:601[2] during the startup, but for some reason it seems it
> doesn't. Regrettably I don't have the time to go further right know.
> Could it be some issue with /dev/mem?

It's probably due to this patch:


(We are not using master of pciaccess).

I removed the mapping and set it to NULL because there was a bug that caused
the initial mapping within "probe" to prevent further mappings of the same 
region later on.

Perhaps a better way to fix the mapping problem I encountered
is by removing the check for previous mappings when trying to map regions,
but no one commented on my PR upstream (yet).


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