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Re: kern/45718: processes sometimes get stuck and spin in vm_map
The following reply was made to PR kern/45718; it has been noted by GNATS.
From: Chuck Silvers <chuq%chuq.com@localhost>
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.
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