More problems self-hosting -current on RPi3

[tech-lists]

Hi,

On 31/03/2018 00:50, bob prohaska wrote:
> Here's a strange buildworld failure with -current on an RPI3. 
>  
> To set the stage, a make -j2 buildworld/buildkernel was run from a 
> clean (run make cleandir twice, rm -rf /usr/obj/usr/src) start. Kernel
> and sources were at, or close to, r331146.
>  
> Buildworld finished, but the kernel build failed on an error of long standing,
> something about mismatches between various versions of stdint.h in the file
> system. Svnlite update reported quite a bit of activity, so the world/kernel 
> build was restarted with -j2 and -DNO_CLEAN.
>  
> Some hours later, the system was found with all ssh sessions terminated
> and the top output recorded in the link below. It looks as if the system
> decided it was out of swap, and then went on a killing spree when lld.ld 
> didn't go away. Disregarding the stated swap usage, ld.lld was less than 
> 1.4 GB in size with 3 GB of swap.
> 
> Details are at http://www.zefox.net/~fbsd/rpi3/crashes/20180330/
> 
> It's worth noting that gstat reports write speeds of 2-3 MB/sec to
> the microSD card and USB flash, which does not seem much worse than
> mechanical hard disks. The system _does_ seem prone to a sort of
> "swap frenzy" when swap usage goes much over 10%, recovering at
> intervals when all the cores are busy. Some months ago it was at
> least occasionally possible to finish a -j4 buildworld, now even
> -j2 buildworld is extremely uncertain. 

Do you think the following might be related to the swap problems you've
been having:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221356

https://lists.freebsd.org/pipermail/freebsd-stable/2018-March/088467.html

-- 
J.