[sac-dev] Bugs found

[Kuang He]

Hi,

I'm using SAC v101.1 on a linux box (Ubuntu 8.04), and the glibc
version is 2.7 (2.7-10ubuntu3, to be exact).

$ uname -a
Linux ....... 2.6.24-19-generic #1 SMP Fri Jul 11 23:41:49 UTC 2008
i686 GNU/Linux

Bug 1: Trying to use Ctrl+D to quit SAC instead of using the command
`quit' will always cause a segmentation fault.

$ sac
SAC> [Press CTRL+D]
Segmentation fault

Bug 2: Putting a space after the comma in something like "&1,DIST"
will _sometimes_ cause SAC to suddenly abort, with a message from
glibc indicating possible double free. Below is an example of a case
where this problem does not show up and another case where the problem
does show up.

$ sac
SAC> r vel.sac
SAC> evaluate to dist &1,dist
SAC> evaluate to dist &1, dist
 ERROR interpreting command:  evaluate to dist '           dist
 ILLEGAL OPTION:

$ sac
SAC> r vel.sac
SAC> evaluate to dist1 &1,dist
SAC> message %dist1
 2.84897$
SAC> evaluate to dist1 &1, dist
*** glibc detected *** /usr/local/sac/bin/sac: double free or
corruption (!prev): 0x0843f020 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7c9ba85]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb7c9f4f0]
/usr/local/sac/bin/sac[0x805d749]
/usr/local/sac/bin/sac[0x80c81fe]
/usr/local/sac/bin/sac[0x804e60f]
/usr/local/sac/bin/sac[0x804b991]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb7c46450]
/usr/local/sac/bin/sac[0x804b5b1]
======= Memory map: ========
08048000-08197000 r-xp 00000000 08:01 1309634    /usr/local/sac/bin/sac
08197000-0819d000 rw-p 0014e000 08:01 1309634    /usr/local/sac/bin/sac
0819d000-08443000 rw-p 0819d000 00:00 0          [heap]
b7a00000-b7a21000 rw-p b7a00000 00:00 0
b7a21000-b7b00000 ---p b7a21000 00:00 0
b7c0c000-b7c0d000 rw-p b7c0c000 00:00 0
b7c0d000-b7c11000 r-xp 00000000 08:01 671763     /usr/lib/libXdmcp.so.6.0.0
b7c11000-b7c12000 rw-p 00003000 08:01 671763     /usr/lib/libXdmcp.so.6.0.0
b7c12000-b7c14000 r-xp 00000000 08:01 671752     /usr/lib/libXau.so.6.0.0
b7c14000-b7c15000 rw-p 00001000 08:01 671752     /usr/lib/libXau.so.6.0.0
b7c15000-b7c2c000 r-xp 00000000 08:01 671564     /usr/lib/libxcb.so.1.0.0
b7c2c000-b7c2d000 rw-p 00016000 08:01 671564     /usr/lib/libxcb.so.1.0.0
b7c2d000-b7c2e000 r-xp 00000000 08:01 671723     /usr/lib/libxcb-xlib.so.0.0.0
b7c2e000-b7c2f000 rw-p 00000000 08:01 671723     /usr/lib/libxcb-xlib.so.0.0.0
b7c2f000-b7c30000 rw-p b7c2f000 00:00 0
b7c30000-b7d79000 r-xp 00000000 08:01 2812605    /lib/tls/i686/cmov/libc-2.7.so
b7d79000-b7d7a000 r--p 00149000 08:01 2812605    /lib/tls/i686/cmov/libc-2.7.so
b7d7a000-b7d7c000 rw-p 0014a000 08:01 2812605    /lib/tls/i686/cmov/libc-2.7.so
b7d7c000-b7d7f000 rw-p b7d7c000 00:00 0
b7d7f000-b7dac000 r-xp 00000000 08:01 2779973    /lib/libncurses.so.5.6
b7dac000-b7daf000 rw-p 0002c000 08:01 2779973    /lib/libncurses.so.5.6
b7daf000-b7dd2000 r-xp 00000000 08:01 2812613    /lib/tls/i686/cmov/libm-2.7.so
b7dd2000-b7dd4000 rw-p 00023000 08:01 2812613    /lib/tls/i686/cmov/libm-2.7.so
b7dd4000-b7dd6000 r-xp 00000000 08:01 2812611    /lib/tls/i686/cmov/libdl-2.7.so
b7dd6000-b7dd8000 rw-p 00001000 08:01 2812611    /lib/tls/i686/cmov/libdl-2.7.so
b7ddb000-b7de5000 r-xp 00000000 08:01 2779880    /lib/libgcc_s.so.1
b7de5000-b7de6000 rw-p 0000a000 08:01 2779880    /lib/libgcc_s.so.1
b7de6000-b7de8000 rw-p b7de6000 00:00 0
b7de8000-b7ecc000 r-xp 00000000 08:01 672597     /usr/lib/libX11.so.6.2.0
b7ecc000-b7ecf000 rw-p 000e4000 08:01 672597     /usr/lib/libX11.so.6.2.0
b7ecf000-b7ed0000 rw-p b7ecf000 00:00 0
b7ed0000-b7ee5000 r-xp 00000000 08:01 670455     /usr/lib/libICE.so.6.3.0
b7ee5000-b7ee6000 rw-p 00014000 08:01 670455     /usr/lib/libICE.so.6.3.0
b7ee6000-b7ee8000 rw-p b7ee6000 00:00 0
b7ee8000-b7eef000 r-xp 00000000 08:01 671742     /usr/lib/libSM.so.6.0.0
b7eef000-b7ef0000 rw-p 00006000 08:01 671742     /usr/lib/libSM.so.6.0.0
b7ef0000-b7ef2000 rw-p b7ef0000 00:00 0
b7ef2000-b7ef3000 r-xp b7ef2000 00:00 0          [vdso]
b7ef3000-b7f0d000 r-xp 00000000 08:01 2779919    /lib/ld-2.7.so
b7f0d000-b7f0f000 rw-p 00019000 08:01 2779919    /lib/ld-2.7.so
bf86b000-bf880000 rw-p bffeb000 00:00 0          [stack]
Aborted

The file vel.sac used above can be found at:

http://maxwell.phys.uconn.edu/~icrazy/sac/vel.sac


Best regards,

-- 
Kuang He
Department of Physics
University of Connecticut
Storrs, CT 06269-3046

Tel: +1.860.486.4919
Web: http://www.phys.uconn.edu/~he/