Re: gdb 5.1 dumped core on me [was: Emacs abort under gdb]

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Article #2808

#2808

From: Michael Snyder
Date: Sat, 26 Jan 2002 03:26

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Eli Zaretskii wrote:
> 
> > From: Francesco Potorti` <pot@gnu.org>
> > Date: Tue, 22 Jan 2002 12:27:11 +0100
> >
> > (gdb) p/x current_buffer->auto_save_file_name
> > $59 = 0x1827b31c
> > (gdb) xstring
> > $60 = (struct Lisp_String *) 0x827b31c
> > Segmentation fault (core dumped)
> 
> Does GDB's core file say something interesting about where did GDB
> crash?
> 
> Anyway, since no one responded, let me rephrase the (implicit)
> question in Francesco's report: Is GDB supposed to handle invalid
> memory accesses gracefully?  That is, if the user asks GDB to access
> the inferior's memory via an invalid pointer, does GDB protect itself
> against SIGSEGV and other related calamities?

An illegal memory access in the child will not cause a signal in the
parent.
If GDB gets a segv, it is because of some bad pointer or data structure
within GDB, not because of accessing a bad address in the child.

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<E16LkEc-0007YI-00@pot.cnuce.cnr.it> <200201030031.g030V6n03535@aztec.santafe.edu> <E16NaIT-0005W4-00@pot.cnuce.cnr.it> <200201080630.g086Upf05212@aztec.santafe.edu> <E16SeTn-0003nm-00@pot.cnuce.cnr.it> <200201220539.g0M5dC814870@aztec.santafe.edu> <E16Sz55-0003jb-00@pot.cnuce.cnr.it> <200201240740.JAA16532@is.elta.co.il>

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From: msnyder@redhat.com (Michael Snyder)
Subject: Re: gdb 5.1 dumped core on me [was: Emacs abort under gdb]
Date: Fri, 25 Jan 2002 19:26:28 -0800
Organization: Red Hat, Inc.
Message-ID: <3C5221E4.90160A45@redhat.com>
References: <E16LkEc-0007YI-00@pot.cnuce.cnr.it>
 <200201030031.g030V6n03535@aztec.santafe.edu>
 <E16NaIT-0005W4-00@pot.cnuce.cnr.it>
 <200201080630.g086Upf05212@aztec.santafe.edu>
 <E16SeTn-0003nm-00@pot.cnuce.cnr.it>
 <200201220539.g0M5dC814870@aztec.santafe.edu>
 <E16Sz55-0003jb-00@pot.cnuce.cnr.it>
 <200201240740.JAA16532@is.elta.co.il>
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