Date: Mon, 14 May 2001 18:38:07 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.ORG> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: freebsd-current@FreeBSD.ORG Subject: Re: pgm to kill 4.3 via vm Message-ID: <Pine.NEB.3.96L.1010514183649.77894A-100000@fledge.watson.org> In-Reply-To: <200105142005.QAA29504@khavrinen.lcs.mit.edu>
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On Mon, 14 May 2001, Garrett Wollman wrote: > <<On Thu, 10 May 2001 12:40:42 -0400 (EDT), Robert Watson <rwatson@FreeBSD.ORG> said: > > > The process and signal-related structures may be inconsistent if the > > debugger disregards existing locks held over those structures. It does > > not matter if code is currently still executing, it matters that > > preemption can occur. The choices appear to be: > > Preemption should never occur while the debugger is running. If those > structures are in an inconsistent state, it *should* be visible to the > debugger. Yes, exactly. The debugger my preempt, and the structures may be in an inconsistent state. Therefor, caution must be used when making use of functions that assume a consistent state, or attempt to make use of locks which may already be held but cannot be released. Robert N M Watson FreeBSD Core Team, TrustedBSD Project robert@fledge.watson.org NAI Labs, Safeport Network Services To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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