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Forums > CSDb Entries > Release id #154516 : Subsizer 0.5
2017-03-18 19:36
Compyx

Registered: Jan 2005
Posts: 216
Release id #154516 : Subsizer 0.5

Better to take this to the forum.

After adding some printf() statements to track the file open failure with "some demo.prg", the quoting of arguments works, but only sometimes. Which usually indicates a deeper problem somewhere.

Running through valgrind I get same nasty messages:
compyx@asus-p5k:~$ valgrind bin/subsizer "music demo.prg"
==25408== Memcheck, a memory error detector
==25408== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==25408== Using Valgrind-3.12.0.SVN and LibVEX; rerun with -h for copyright info
==25408== Command: bin/subsizer music\ demo.prg
==25408== 
argv[0] = 'bin/subsizer'
argv[1] = 'music demo.prg'
build matches...
==25408== Warning: set address range perms: large range [0x395f8040, 0x98bd9040) (undefined)
...0.49 s
optimizing matches...
==25408== Conditional jump or move depends on uninitialised value(s)
==25408==    at 0x10B6F4: cost_enc (in /home/compyx/bin/subsizer)
==25408==    by 0x10C020: crunch_normal_int.isra.1 (in /home/compyx/bin/subsizer)
==25408==    by 0x109818: main (in /home/compyx/bin/subsizer)
==25408== 
 5264 (left 70.84%)
0000113235660150,1112,1010122424555667,222233346666789A,132223234566679C
==25408== Conditional jump or move depends on uninitialised value(s)
==25408==    at 0x4C31CC2: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==25408==    by 0x10C4B4: crunch_normal_int.isra.1 (in /home/compyx/bin/subsizer)
==25408==    by 0x109818: main (in /home/compyx/bin/subsizer)
==25408== 
==25408== Conditional jump or move depends on uninitialised value(s)
==25408==    at 0x4C31CFD: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==25408==    by 0x10C4B4: crunch_normal_int.isra.1 (in /home/compyx/bin/subsizer)
==25408==    by 0x109818: main (in /home/compyx/bin/subsizer)
==25408== 
==25408== Conditional jump or move depends on uninitialised value(s)
==25408==    at 0x10C4B7: crunch_normal_int.isra.1 (in /home/compyx/bin/subsizer)
==25408==    by 0x109818: main (in /home/compyx/bin/subsizer)
==25408== 
 4899 (left 65.93%)
0000113235660150,1112,1010122332456667,222323346666789A,132223234566679C
 4897 (left 65.90%)
0000113235660150,1112,1010122332456667,222323346666789A,132223234566679C
==25408== Conditional jump or move depends on uninitialised value(s)
==25408==    at 0x4C31CD6: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==25408==    by 0x10C4B4: crunch_normal_int.isra.1 (in /home/compyx/bin/subsizer)
==25408==    by 0x109818: main (in /home/compyx/bin/subsizer)
==25408== 
...2.02 s
==25408== Warning: set address range perms: large range [0x395f8028, 0x98bd9058) (noaccess)
generating output...
...0.02 s
packed 7431 bytes into 4897 bytes
verifed 7431 bytes...ok
==25408== 
==25408== HEAP SUMMARY:
==25408==     in use at exit: 0 bytes in 0 blocks
==25408==   total heap usage: 101 allocs, 101 frees, 1,624,666,687 bytes allocated
==25408== 
==25408== All heap blocks were freed -- no leaks are possible
==25408== 
==25408== For counts of detected and suppressed errors, rerun with: -v
==25408== Use --track-origins=yes to see where uninitialised values come from
==25408== ERROR SUMMARY: 6 errors from 5 contexts (suppressed: 0 from 0)


I tried using --track-origins=yes, but that completely borked my system, that filled my memory and my swap space and made my system completely unresponsive, had to kill valgrind via a tty.


Is there bug a tracker somewhere for this?
 
... 18 posts hidden. Click here to view all posts....
 
2017-03-18 20:39
tlr

Registered: Sep 2003
Posts: 1118
I know it's ugly, but basically es gets memcpy'd to last_es for comparison so any uninitialized values are compared to themselves. It shouldn't (tm) affect operation.

I'll try to do something nicer in the future though.

Btw, I haven't really been able to reproduce anything special related to spaces in the filename. Any clues?
2017-03-18 20:41
Compyx

Registered: Jan 2005
Posts: 216
That didn't help. Maybe tomorrow when I have more time (hacking on my own stuff and VICE), I'll try to figure out where the uninitialized stuff comes from.
2017-03-18 20:46
tlr

Registered: Sep 2003
Posts: 1118
Ok, thanks. The valgrind errors completely disappeared on my test case here using this. Maybe it depends on the input file... Running Ubuntu 14.04 64-bit on an i5 here. I'd love a reproducible test case. PM if you like.
2017-03-18 20:56
Compyx

Registered: Jan 2005
Posts: 216
I simply used this: http://csdb.dk/release/download.php?id=191285, since it was something I downloaded recently and was small.

The filename stuff happens randomly, when I added some printf()'s to see what was going on, it disappeared for a while, but then came back. So that might indicate stack corruption somewhere.

But so far, that file has given me consistent errors with valgrind. I'm running Debian Stretch 64-bit here, on an old Core Duo box. GCC is 6.3.0, valgrind is 3.12.0.SVN.
2017-03-18 21:03
tlr

Registered: Sep 2003
Posts: 1118
Gaah... Maybe I shouldn't have done as many kludges when coding this. :/

I'm sure there is some stack corruption problem but not easily reproducible here unfortunately. Will clean up some nastyness for the next release.
tlr@pinecone:subsizer$ valgrind subsizer -x "tests/Ninth.prg"
==13935== Memcheck, a memory error detector
==13935== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==13935== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==13935== Command: subsizer -x tests/Ninth.prg
==13935== 
read 'tests/Ninth.prg' $0801-$7400.
detected sys: $4000
build matches...
==13935== Warning: set address range perms: large range [0x3a048040, 0x99629040) (undefined)
...6.48 s
optimizing matches...
 7139 (left 25.82%)
1110334466621000,1012,0000001022345657,02112344560678AD,02103434555789AF
 6677 (left 24.15%)
1110334465462410,1012,0000001022345657,02112344560678AD,02103434555789AF
 6682 (left 24.17%)
1110334465462410,1012,0000001022345657,02112344560678AD,02103434555789AF
...6.69 s
==13935== Warning: set address range perms: large range [0x3a048028, 0x99629058) (noaccess)
generating output...
...0.02 s
safe = 2
packed 27647 bytes (109 blocks) into 6974 bytes (28 blocks)
==13935== 
==13935== HEAP SUMMARY:
==13935==     in use at exit: 0 bytes in 0 blocks
==13935==   total heap usage: 100 allocs, 100 frees, 1,624,919,704 bytes allocated
==13935== 
==13935== All heap blocks were freed -- no leaks are possible
==13935== 
==13935== For counts of detected and suppressed errors, rerun with: -v
==13935== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
tlr@pinecone:subsizer$ 
2017-03-18 21:09
soci

Registered: Sep 2003
Posts: 323
Works fine here, also for spaced filenames. Similar system but 32 bit so I had to adjust the following hack otherwise the allocation didn't succeed with valgrind:
safe_malloc(200000000 * sizeof(Match), "matches");
2017-03-18 21:15
tlr

Registered: Sep 2003
Posts: 1118
Interesting! What version of gcc?

I have:
tlr@pinecone:subsizer$ gcc --version
gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

tlr@pinecone:subsizer$
2017-03-18 21:23
soci

Registered: Sep 2003
Posts: 323
gcc (Debian 6.3.0-8) 6.3.0 20170221

There are some harmless warnings with it:
fold.c: In function ‘fold’:
fold.c:339:12: warning: unused variable ‘n’ [-Wunused-variable]
     size_t n = low_limit - sa;
            ^
At top level:
fold.c:142:13: warning: ‘dump_rle_entries’ defined but not used [-Wunused-function]
 static void dump_rle_entries(void)
             ^~~~~~~~~~~~~~~~
In file included from fold.c:15:0:
decrunchers.h:277:18: warning: ‘fs_list_header’ defined but not used [-Wunused-variable]
 static FixStruct fs_list_header[] = {
                  ^~~~~~~~~~~~~~
decrunchers.h:270:18: warning: ‘fs_list_tail’ defined but not used [-Wunused-variable]
 static FixStruct fs_list_tail[] = {
                  ^~~~~~~~~~~~
decrunchers.h:263:18: warning: ‘fs_list_decruncher’ defined but not used [-Wunused-variable]
 static FixStruct fs_list_decruncher[] = {
                  ^~~~~~~~~~~~~~~~~~
2017-03-21 19:51
tlr

Registered: Sep 2003
Posts: 1118
update: Subsizer 0.5.1
subsizer 0.5.1, 2017-03-21
  - added LICENSE.txt
  - give error if no end marker can be found.
  - got rid of a few warnings as reported by soci.
  - fixed issue with uninitialized memory as reported by compyx.
  - added decruncher source due to popular demand.  well, only bitbreaker. :)
    (caution: encoding may change between versions)
2017-03-24 05:01
ChristopherJam

Registered: Aug 2004
Posts: 586
Has anyone tested this on the Pearl for Pigs corpus?

I'm writing a benchmarks page at codebase ( http://www.codebase64.org/doku.php?id=base:compression_benchmar.. ), and would be interesting to see where Subsizer fits in the big picture

I'll add a scatter plot soonish.
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