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From: José Luis González <[EMAIL PROTECTED]>
Subject: gcc-3.0: Weird SegFault on exit()
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Date: Sun, 02 Dec 2001 16:26:52 +0100
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Package: gcc-3.0
Version: 1:3.0.2-3
Severity: normal
Weird reproducible bug for gcc-3.0 on i386 (I have not checked other
architectures).
The program runs correctly, but when exiting, it segfaults. Doing a
backtrace reveals the segfault was out of the program, on system
libraries. This seems to be a libc bug, but it does not happen with
gcc 2.95.4.
I have placed a program that reproduces this bug on
http://garfield.asoc.euitt.upm.es/~jlg/debfiles.c
Removing function "position" the segfault does not happen, which
makes this bug even more obscure because "position" does not
touch the C library nor modifies external data (it's just a binary
search on an array of strings. The same program without "position"
(it is replaced with a macro function returning always -1 (not found):
http://garfield.asoc.euitt.upm.es/~jlg/debfiles2.c
Running the program without arguments is enough to get the bug.
The backtrace from debfiles.c:
(gdb) run
Starting program: /home/jl/debfiles
Program received signal SIGSEGV, Segmentation fault.
0x40117922 in __deregister_frame_info_bases () from /lib/libc.so.6
(gdb) where
#0 0x40117922 in __deregister_frame_info_bases () from /lib/libc.so.6
#1 0x40119b55 in __umoddi3 () from /lib/libc.so.6
#2 0x4000b4c6 in _dl_fini () from /lib/ld-linux.so.2
#3 0x4004afa3 in exit () from /lib/libc.so.6
#4 0x40038665 in __libc_start_main () from /lib/libc.so.6
-- System Information
Debian Release: testing/unstable
Kernel Version: Linux caballero 2.4.16 #2 mié nov 28 20:28:55 CET 2001 i586
unknown
Versions of the packages gcc-3.0 depends on:
ii binutils 2.11.92.0.10-4 The GNU assembler, linker and binary utiliti
ii cpp-3.0 3.0.2-3 The GNU C preprocessor.
ii gcc-3.0-base 3.0.2-3 The GNU Compiler Collection (base package).
ii libc6 2.2.4-5 GNU C Library: Shared libraries and Timezone
ii libgcc1 3.0.2-3 GCC support library.
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Thu, 30 May 2002 00:13:09 +0200
To: =?iso-8859-1?Q?Jos=E9_Luis_Gonz=E1lez_Gonz=E1lez?= <[EMAIL PROTECTED]>,
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Subject: Re: Bug#122114: feedback wanted on your Debian report #122114
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Jos=E9 Luis Gonz=E1lez Gonz=E1lez writes:
> > Please could you recheck with gcc-3.0.4 and gcc-3.1 (in unstable) a=
nd
> > send the arguments you pass to reproduce the segfault? which comman=
d
> > line do you use for compiling?
>=20
> I have checked with gcc 3.0.4 and it does not trigger the bug. Moreov=
er,
> I have checked with the binary that gave me the segfault (compiled wi=
th
> 3.0.2 or 3.0.3) and it doesn't segfault anymore.
>=20
> I'm sorry I can't test with 3.1. Anyway, it seems the bug was elsewhe=
re,
> probably on glibc, as the same binary that segfaulted on two machines=
> now works fine, and also freshly compiled binaries don't reproduce it=
