Re: kern/45718: processes sometimes get stuck and spin in vm_map

[Chuck Silvers <chuq%chuq.com@localhost>]

The following reply was made to PR kern/45718; it has been noted by GNATS.

From: Chuck Silvers <chuq%chuq.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/45718: processes sometimes get stuck and spin in vm_map
Date: Sat, 1 Sep 2012 17:48:23 -0700

 On Sat, Sep 01, 2012 at 07:20:05PM +0000, Jonathan A. Kollasch wrote:
 >  I've been seeing the hangs of the exec_pool_alloc() variety in 6.0RC1 on
 >  i386.  Using  dd if=/dev/zero of=/dev/null count=1 bs=1G  (machine has
 >  about 2G of RAM, sometimes needs to be more than 1G though) tends to
 >  unwedge everything that gets stuck in vm_map wait channel here.
 
 this sounds like KVA exhaustion.  this was a problem on i386 some years ago
 and I don't remember whether it was ever really fixed.  I vaguely recall
 there was a particular PR that was the main means of tracking that issue
 but I can't find it now.
 
 -Chuck