Date: Mon, 18 Nov 2002 10:47:59 +0100 From: Cinek <cinekcvs@gmx.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: i386/45391: /usr/bin/cmp coredumps while reading a faulty CD-R Message-ID: <200211181047.59311.cinekcvs@gmx.net>
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>Number: 45391
>Category: i386
>Synopsis: /usr/bin/cmp coredumps while reading a faulty CD-R
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 18 01:50:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Cinek
>Release: FreeBSD 4.7-RELEASE i386
>Organization:
none
>Environment:
System: FreeBSD natalia 4.7-RELEASE FreeBSD 4.7-RELEASE #1: Fri Nov 8 17:=
45:30=20
CET 2002
Machine: Intel P3-500MHz
OS: FreeBSD 4.7
>Description:
When using the command /usr/bin/cmp from the default
FreeBSD-4.7 package, it is possible to produce a coredump.
It seems, there is a problem in handling errors while
reading faulty files. It happened to me while I was comparing
two files which I suspected to be dupes on my CD-Rs.
I guess it will not help much when I post the output
from gdb without symbol tables, but let's try at least:
----------------------------------------------------------------------
GNU gdb 4.18 (FreeBSD)
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you =
are
welcome to change it and/or distribute copies of it under certain conditi=
ons.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for detail=
s.
This GDB was configured as "i386-unknown-freebsd"...
(no debugging symbols found)...
Core was generated by `cmp'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libc.so.4...(no debugging symbols found)...=
done.
Reading symbols from /usr/libexec/ld-elf.so.1...(no debugging symbols=20
found)...
done.
#0 0x8048e17 in open ()
(gdb) bt
#0 0x8048e17 in open ()
#1 0xbfbffb0d in ?? ()
#2 0x8048bc1 in open ()
#3 0x8048731 in open ()
(gdb) info frame
Stack level 0, frame at 0xbfbff840:
eip =3D 0x8048e17 in open; saved eip 0x8048bc1
(FRAMELESS), called by frame at 0xbfbff840
Arglist at 0xbfbff840, args:
Locals at 0xbfbff840, Previous frame's sp is 0x0
Saved registers:
ebp at 0xbfbff840, eip at 0xbfbff844
(gdb) info sharedlibrary
=46rom To Syms Read Shared Object Library
0x28067000 0x280fec78 Yes /usr/lib/libc.so.4
0x2804a000 0x2805e210 Yes /usr/libexec/ld-elf.so.1
----------------------------------------------------------------------
>How-To-Repeat:
1) You need two copies of files. One on Your hard-disk,
the other one on a _almost_ unreadable CD(R).
(That might be somehow difficult.)
2) Start the following command:
cmp locally_stored_file same_file_on_unreadable_cd
>Fix:
There is no fix.
>Release-Note:
>Audit-Trail:
>Unformatted:
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