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Re: [PATCH] fix for Re: crash in gc with upside-down stack

From: Ludovic Courtès
Subject: Re: [PATCH] fix for Re: crash in gc with upside-down stack
Date: Fri, 14 Nov 2008 00:40:42 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux)


"Linas Vepstas" <address@hidden> writes:

> The patch below fixes a crash during garbage collection, where, during
> the mark-stack phase, the top and bottom of the stack are found to be
> in backwards order, typically because scm_with_guile() was called when
> the stack is much shorter than when a thread was first guilified. That
> is, the stack base pointer is stale, and can be inverted from the stack
> top. If GC runs due to activity in some other thread, the stale base
> pointer leads to the crash (as base-top is approximately 2^32 or 2^64).

Good catch!  I applied it, along with a test case that reproduced the



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