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dd Segmentation Fault

From: Richard Hirner
Subject: dd Segmentation Fault
Date: Thu, 14 Sep 2006 13:48:39 +0200


I'm using Ubuntu 6.06 (Linux 2.6.15-26-k7 #1 SMP PREEMPT) with coreutils
5.93 and discovered that dd crashes when I want to make an ISO file from
a cd-rom:

dd if=/dev/cdrom of=cd1.iso
[xxx records in/out]
Segmentation fault

This also happens if I read only one block:
dd if=/dev/cdrom of=cd1.iso count=1
1+0 records in
1+0 records out
Segmentation fault

So I downloaded the newest coreutils 5.97, compiled it with debug info
and got a gdb stacktrace:

address@hidden:~/tmp$ gdb coreutils-5.97/src/dd
GNU gdb 6.4-debian
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
welcome to change it and/or distribute copies of it under certain
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
This GDB was configured as "i486-linux-gnu"...Using host libthread_db
library "/lib/tls/i686/cmov/libthread_db.so.1".

(gdb) run if=/dev/cdrom of=cd1.iso count=1
Starting program: /home/richard/tmp/coreutils-5.97/src/dd if=/dev/cdrom
of=cd1.iso count=1
[Thread debugging using libthread_db enabled]
[New Thread -1209837344 (LWP 29256)]
1+0 records in
1+0 records out

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1209837344 (LWP 29256)]
0xb7eb22a3 in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) thread apply all bt

Thread 1 (Thread -1209837344 (LWP 29256)):
#0  0xb7eb22a3 in strlen () from /lib/tls/i686/cmov/libc.so.6
#1  0xb7e862e4 in vfprintf () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7e82d7c in buffered_vfprintf () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e82fbb in vfprintf () from /lib/tls/i686/cmov/libc.so.6
#4  0xb7e8b6af in fprintf () from /lib/tls/i686/cmov/libc.so.6
#5  0x080497b2 in print_stats () at dd.c:553
#6  0x0804b3fa in main (argc=4, argv=0xbf9a0824) at dd.c:600

Richard <address@hidden>

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