GNU bug report logs - #25479
memory leaks in dfa

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From: Norihiro Tanaka <noritnk <at> kcn.ne.jp>
To: Arnold Robbins <arnold <at> skeeve.com>
Cc: bug-gnulib <at> gnu.org, 25479 <at> debbugs.gnu.org
Subject: bug#25479: memory leaks in dfa
Date: Thu, 19 Jan 2017 07:56:40 +0900

[Message part 1 (text/plain, inline)]

On Wed, 18 Jan 2017 23:11:28 +0200
Arnold Robbins <arnold <at> skeeve.com> wrote:

> Hi Grep Guys.
> 
> Please:
> 
> 	clone gawk repo
> 	cd gawk
> 	./bootstrap.sh && ./configure && make -j
> 	make valgrind
> 
> Look at the 'definitely lost' lines.  For example:
> 
> ==30472== 240 bytes in 2 blocks are definitely lost in loss record 128 of 170
> ==30472==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64
> -linux.so)
> ==30472==    by 0x44D42A: emalloc_real (awk.h:1923)
> ==30472==    by 0x44D42A: xmalloc (gawkmisc.c:57)
> ==30472==    by 0x468806: xnmalloc (xalloc.h:134)
> ==30472==    by 0x468806: alloc_position_set (dfa.c:2057)
> ==30472==    by 0x468D93: epsclosure (dfa.c:2272)
> ==30472==    by 0x468D93: dfaanalyze (dfa.c:2601)
> ==30472==    by 0x46CA84: dfacomp (dfa.c:3531)
> ==30472==    by 0x463284: make_regexp (re.c:231)
> ==30472==    by 0x414548: make_regnode (awkgram.y:5005)
> ==30472==    by 0x416A33: yyparse (awkgram.y:505)
> ==30472==    by 0x41C9E3: parse_program (awkgram.y:2580)
> ==30472==    by 0x40D373: main (main.c:459)
> 
> There may be other paths as well.
> 
> Can y'all track this down and fix?
> 
> Thanks,
> 
> Arnold

Thanks for the report.  It is caused by temporarily allocated memory not
freed.

[0001-dfa-fix-memory-leak-in-parse.patch (text/plain, attachment)]

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