Bug#248352: marked as done (seed48: segfaults, seems to expect nonstandard argument type)
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>From arthur@korn.ch Mon May 10 11:16:47 2004
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To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: seed48: segfaults, seems to expect nonstandard argument type
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Date: Mon, 10 May 2004 20:16:49 +0200
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Package: libc6
Version: 2.3.2.ds1-12
Severity: critical
Tags: sid
Justification: breaks unrelated software
Hi
Attached you find a testcase, I stumbled over this when compiling
afbackup.
The gdb output that lead me to my conclusion that libc6 seems to expect
another argument type (and size ...) than seed48() normaly does:
(gdb) run
Starting program: /home/twoflower/arthur/doc/sp/afbackup/a.out
Program received signal SIGSEGV, Segmentation fault.
__seed48_r (seed16v=0x94b0, buffer=0x40149f48) at seed48_r.c:33
33 seed48_r.c: No such file or directory.
in seed48_r.c
(gdb) bt
#0 __seed48_r (seed16v=0x94b0, buffer=0x40149f48) at seed48_r.c:33
#1 0x400449c9 in seed48 (seed16v=0x40149f48) at seed48.c:27
#2 0x08048384 in main (argc=1, argv=0xbffff9e4) at seed48-testcase.c:7
(gdb) ptype buffer
type = struct drand48_data {
short unsigned int __x[3];
short unsigned int __old_x[3];
short unsigned int __c;
short unsigned int __init;
long long unsigned int __a;
} *
As you see are the adresses of seed48's seed16v and __seed48_r's buffer the
same, so probably the unsigned short[3] that seed48 get's passed is being
casted to drand48_data (which is by far larger).
Sorry I can't help any more. I nonetheless hope this helps fixing some
of the breakage in other apps that seems to be taking place.
Thanks for your work!
ciao, 2ri
*** doc/sp/afbackup/seed48-testcase.c
#include <stdlib.h>
unsigned short seed[3] = {0x7d1b, 0xa934, 0xbf10};
int main(int argc, char** argv)
{
seed48(seed);
}
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (50, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.4
Locale: LANG=de_CH, LC_CTYPE=de_CH
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
-- no debconf information
---------------------------------------
Received: (at 248352-done) by bugs.debian.org; 15 May 2004 15:15:38 +0000
>From gotom@debian.or.jp Sat May 15 08:15:38 2004
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Date: Sun, 16 May 2004 00:15:37 +0900
Message-ID: <81hduhzppi.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: "Arthur Korn" <arthur@korn.ch>, 248352-done@bugs.debian.org
Subject: Re: Bug#248352: seed48: segfaults, seems to expect nonstandard argument type
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<[🔎] 8165b38lbh.wl@omega.webmasters.gr.jp>
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At Tue, 11 May 2004 16:38:58 +0900,
GOTO Masanori wrote:
> At Mon, 10 May 2004 20:16:49 +0200,
> Arthur Korn wrote:
> > Severity: critical
>
> > *** doc/sp/afbackup/seed48-testcase.c
> > #include <stdlib.h>
> >
> > unsigned short seed[3] = {0x7d1b, 0xa934, 0xbf10};
> >
> > int main(int argc, char** argv)
> > {
> > seed48(seed);
> > }
>
> It works OK for me...
I don't think it's bug. Tomas' example showed us that his program was
just worked without problem, and he did not got sigsegv. This problem
is yours. Please recheck your environment. I close this bug.
Regards,
-- gotom
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