dd segfaults (amd64)

[Miek Gieben]

Binary package hint: coreutils

Didn't even know dd /could/ segfault, but here it is:
% dd if=/dev/zero of=/dev/null bs=1 count=40 skip=52
40+0 records in
40+0 records out
zsh: segmentation fault dd if=/dev/zero of=/dev/null bs=1 count=40 skip=52

[Miek Gieben (miek)]

On i386 nothing happens

[Vassilis Pandis (pandisv)]

Thanks for reporting this. With what version of dd is this? Can you please try to get a backtrace by following http://wiki.ubuntu.com/DebuggingProgramCrash ? Also try running 'export LANG=C' before dd. If this fixes the problem, please paste the output of 'echo $LANG' . Thanks in advance.

[Miek Gieben (miek)]

[On 23 Sep, @17:37, Vassilis Pandis wrote in "[Bug 62034] Re: dd segfaults ( ..."]
> Thanks for reporting this. With what version of dd is this? Can you

sorry, the version in dapper: Version: 5.93-5ubuntu4

> please try to get a backtrace by following
> http://wiki.ubuntu.com/DebuggingProgramCrash ? Also try running 'export

Core was generated by `./dd if /dev/zero of /dev/null bs 1 count 40 skip 52'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/librt.so.1...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
#0 0x00002aaaaad3afc0 in strlen () from /lib/libc.so.6
(gdb) where
#0 0x00002aaaaad3afc0 in strlen () from /lib/libc.so.6
#1 0x00002aaaaad0d7e7 in vfprintf () from /lib/libc.so.6
#2 0x00002aaaaad0a1a9 in cuserid () from /lib/libc.so.6
#3 0x00002aaaaad0a389 in vfprintf () from /lib/libc.so.6
#4 0x00002aaaaad12db6 in fprintf () from /lib/libc.so.6
#5 0x0000000000401d6f in print_stats () at dd.c:553
#6 0x000000000040372f in main (argc=6, argv=0x7fffffc8e868) at dd.c:600

I've edited the file so I'm not really to sure about that
line number.

> LANG=C' before dd. If this fixes the problem, please paste the output of
> 'echo $LANG' . Thanks in advance.

Yep, right on target, now it works:
% LANG=C dd if=/dev/zero of=/dev/null bs=1 count=40 skip=52
40+0 records in
40+0 records out
40 bytes (40 B) copied, 5.3e-05 seconds, 755 kB/s

--
grtz,
  - Miek

  http://www.miek.nl
  PGP: 6A3C F450 6D4E 7C6B C23C F982 258B 85CF 3880 D0F6

[Vassilis Pandis (pandisv)]

Thanks for the bug report. This particular bug has already been
reported into our bug tracking system, but please feel free to report
any further bugs which you find.