Segmentation fault when trying to decompress

[Peter1339]

i'm trying to decompress a file but i was getting segment fault/killed by SIGSEGV, downloaded the latest version and tried again, also segfault, so i tried enabling debug..
moinakg-pcompress-c6e779c# ./config --enable-debug --enable-debug-stats --wavpack-dir=wavpack-4.80.0 ; make
and now i can decompress the file just fine :/, i would like to help you to find the bug but i don't know how to best do that, so let me know if i can do anything to help narrow down this bug..

[moinakg]

Hi,

Thanks a lot for reporting the problem and I apologise for the delayed
response. I was traveling with little email access.
So this issue looks like an optimization problem. I would need a stack
trace to debug it. Can you please do the following and report back:

1. Install gdb (GNU Debugger) if not already installed
2. In the pcompress directory dump the file named "pcompress":
   cat ./pcompress

You should see something like this:
PC_PATH="/home/<your username>/pcompress"
LD_LIBRARY_PATH="${PC_PATH}"
export LD_LIBRARY_PATH

exec ${PC_PATH}/buildtmp/pcompress "$@"

Now set the same environment settings directly in your shell:
export LD_LIBRARY_PATH="/home/<your username>/pcompress"

3. Load pcompress binary with gdb:
   gdb ./buildtmp/pcompress

You will see something line this (I am running Ubuntu):
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
....
....
Reading symbols from ./buildtmp/pcompress...(no debugging symbols

found)...done.
(gdb)

4. Run with the arguments that you would pass to pcompress:
   (gdb) run

5. When the program crashes it will come back to "(gdb)" prompt. At that
   point run the bt command:
   (gdb) bt

Copy the output of bt command and send it to me.

Hope you got all this :)

Regards,
Moinak.

On Sat, Apr 16, 2016 at 10:28 PM, Peter1339 notifications@github.com
wrote:

i'm trying to decompress a file but i was getting segment fault/killed by
SIGSEGV, downloaded the latest version and tried again, also segfault, so i
tried enabling debug..
moinakg-pcompress-c6e779c# ./config --enable-debug --enable-debug-stats
--wavpack-dir=wavpack-4.80.0 ; make
and now i can decompress the file just fine :/, i would like to help you
to find the bug but i don't know how to best do that, so let me know if i
can do anything to help narrow down this bug..

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[Peter1339]

GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
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Reading symbols from /root/pcompress/buildtmp/pcompress...(no debugging symbols found)...done.
(gdb) run -d /silo/wildfire/wildfire-home_28-May.pz
Starting program: /root/moinakg-pcompress-c6e779c/buildtmp/pcompress -d /silo/wildfire/wildfire-home_28-May.pz
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Using /silo/wildfire/wildfire-home_28-May.pz.out for output file name.
Scaling to 4 threads
[New Thread 0x7fffef4f0700 (LWP 17463)]
[New Thread 0x7fffe87ee700 (LWP 17464)]
[New Thread 0x7fffe1aec700 (LWP 17465)]
[New Thread 0x7fffdadea700 (LWP 17466)]
[New Thread 0x7fffda5e9700 (LWP 17467)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdadea700 (LWP 17466)]
0x00007ffff6abc2b9 in bsc_lzp_decode_block () from /root/pcompress/libpcompress.so.1
(gdb) bt
#0 0x00007ffff6abc2b9 in bsc_lzp_decode_block () from /root/pcompress/libpcompress.so.1
#1 0x00007ffff6abcae6 in lzp_decompress () from /root/pcompress/libpcompress.so.1
#2 0x00007ffff6a97646 in preproc_decompress () from /root/pcompress/libpcompress.so.1
#3 0x00007ffff6a97ee8 in perform_decompress () from /root/pcompress/libpcompress.so.1
#4 0x00007ffff5da50a4 in start_thread (arg=0x7fffdadea700) at pthread_create.c:309
#5 0x00007ffff5ada87d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb)