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Re: Is that supposed to happen?

From: Samuel Thibault
Subject: Re: Is that supposed to happen?
Date: Mon, 25 May 2009 12:01:48 +0200
User-agent: Mutt/1.5.12-2006-07-14


Roland McGrath, le Sat 11 Apr 2009 18:47:13 -0700, a écrit :
> vm_read should return a normal out-of-line page there--it's just an RPC
> stub.  So yes, there should be a mapping there.  Unless there is a race
> with a deallocation in another thread or exec, or something, that seems
> like a potential microkernel bug (unless it's a mig stub bug or something).

For the record, I've eventually found the issue: exec calls finish()
several times, but it wasn't idempotent, and that would double-free the
map buffer.  With bad luck, an allocation would happen in between.


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