Re: port-evbarm/55639: Assertion "anon != NULL && anon->an_ref != 0" fails on evbarm-earmv7hf

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR port-evbarm/55639; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-evbarm/55639: Assertion "anon != NULL && anon->an_ref != 0"
 fails on evbarm-earmv7hf
Date: Thu, 3 Sep 2020 09:00:46 +0200

 On Thu, Sep 03, 2020 at 06:55:00AM +0000, Andreas Gustafsson wrote:
 > Since there have been some random successful runs, it is not 100%
 > certain that this commit is the cause, but given that both the commit
 > and the panic are uvm related, it does seems likely.
 
 Several of my ARM boards suffer some kind of "UVM amap corruption" and
 the cubietruck (evbarmv7) is the one that shows it most prominently.
 Symptoms (with unpatched) kernel vary, from silent hang to assertions
 like this.
 
 With a debug patch from Chuck they all show amap corruption (but the patch
 slows things down and the races are less often won/lost).
 
 I marked these machines/test results in the releng status page for -10.
 Interesting that it now also shows up in emulation.
 
 Martin