pmap_fault: PT2MAP abort on rpi2 while building world

[Svatopluk Kraus]

(1) Well, for beginning, you could add more info to panic message.
This pmap_fault() is in pmap-v6.c file. The line before that panic is
the following:

6371 CTR4(KTR_PMAP, "%s: pmap %#x PT2MAP %#x far %#x",
6372     __func__, pmap, PT2MAP, far);
6373 panic("%s: PT2MAP abort", __func__);

The easiest way is to add the same things like in CTR4.

(2) According to console dump, there is an exception from userland
which leads to second exception in pmap_fault(). It would be
interesting to know at what place it generates the second exception,
which IMO should never happen in pmap_fault().

Svata


On Thu, Sep 21, 2017 at 3:56 AM, bob prohaska <fbsd at www.zefox.net> wrote:
> Several times now buildworld attempts have crashed with
>  pmap_fault: PT2MAP abort.
>
> It started several weeks ago and has been happening intermittently
> ever since. So far it's only occurred during buildworld, not other
> compilations such as firefox (which still fails from porting issues).
>
> I couldn't find any recent posts on this error, is it worth a bug
> report?
>
> The information I could gather from the latest crash is at
> http://www.zefox.net/~fbsd/rpi2/crashes/crash_9_20_17/
>
> Thanks for reading, and any guidance!
>
> bob prohaska
>
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