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Re: how does one debug a SEGV in scm_threads_prehistory?

From: Neil Jerram
Subject: Re: how does one debug a SEGV in scm_threads_prehistory?
Date: Thu, 19 Jun 2008 14:14:39 +0100

2008/6/18 Bruce Korb <address@hidden>:
> Our main development server was "upgraded" to 64 bits, but mostly
> still runs 32 bit software,
> so this is from a 32 bit build on a 64 bit platform.  Naturally, this
> all works on 32 on 32 and
> on 64 on 64.  But with 32 on 64, not so well:
> Program received signal SIGSEGV, Segmentation fault.
> 0xb7f482fe in scm_threads_prehistory () from /usr/lib/
> (gdb) bt
> #0  0xb7f482fe in scm_threads_prehistory () from /usr/lib/
> #1  0xb7f4834b in scm_i_thread_sleep_for_gc () from /usr/lib/
> #2  0xb7f48375 in scm_i_thread_put_to_sleep () from /usr/lib/
> #3  0xb7f2f3e4 in scm_i_string_writable_chars () from /usr/lib/
> #4  0xb7f2f53d in scm_c_string_set_x () from /usr/lib/
> #5  0xb7f23839 in scm_read_token () from /usr/lib/

There's definitely something very odd here, because
scm_threads_prehistory() should only be called as part of Guile's
start of day (once-only) initialization.

You could focus on debugging why this happens, using GDB: set a
breakpoint on scm_threads_prehistory, then work out who calls it and
why.  I doubt that will reveal the underlying problem here, but it may
give you (us) a clue about it.


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