# Use of uninitialised value by /\\s/u

**URL:** <https://www.ruby-forum.com/t/use-of-uninitialised-value-by-s-u/107931>\
**Category:** Development\
**Created:** [June 27, 2007, 5:44pm UTC](https://www.ruby-forum.com/t/use-of-uninitialised-value-by-s-u/107931 "2007-06-27T17:44:21Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [June 27, 2007, 5:44pm UTC](https://www.ruby-forum.com/t/use-of-uninitialised-value-by-s-u/107931/1 "2007-06-27T17:44:21Z")

</div>

valgrind e$B$N7k2L$r$^$?D4$Y$k$H!"e(B/\s/u e$B$GL$=i4|2=%a%b%j$r;HMQe(B  
e$B$9$k$h$&$G$9!#e(B

% valgrind ./ruby -ve ‘/\s/u’  
==13719== Memcheck, a memory error detector.  
==13719== Copyright © 2002-2006, and GNU GPL’d, by Julian Seward et  
al.  
==13719== Using LibVEX rev 1658, a library for dynamic binary  
translation.  
==13719== Copyright © 2004-2006, and GNU GPL’d, by OpenWorks LLP.  
==13719== Using valgrind-3.2.1-Debian, a dynamic binary instrumentation  
framework.  
==13719== Copyright © 2000-2006, and GNU GPL’d, by Julian Seward et  
al.  
==13719== For more details, rerun with: -v  
==13719==  
–13719-- DWARF2 CFI reader: unhandled CFI instruction 0:50  
–13719-- DWARF2 CFI reader: unhandled CFI instruction 0:50  
–13719-- DWARF2 CFI reader: unhandled CFI instruction 0:50  
–13719-- DWARF2 CFI reader: unhandled CFI instruction 0:50  
ruby 1.9.0 (2007-06-27 patchlevel 0) [i686-linux]  
==13719== Use of uninitialised value of size 4  
==13719== at 0x80C3A6B: st\_add\_direct (st.c:301)  
==13719== by 0x80BB407: parse\_exp (regparse.c:5046)  
==13719== by 0x80BB9E4: parse\_branch (regparse.c:5223)  
==13719== by 0x80BBB3B: parse\_subexp (regparse.c:5260)  
==13719== by 0x80BBCDC: parse\_regexp (regparse.c:5304)  
==13719== by 0x80BBD8E: onig\_parse\_make\_tree (regparse.c:5331)  
==13719== by 0x80A7B89: onig\_compile (regcomp.c:5364)  
==13719== by 0x809A50F: make\_regexp (re.c:711)  
==13719== by 0x809BF34: rb\_reg\_initialize (re.c:1489)  
==13719== by 0x809C0CD: rb\_reg\_compile (re.c:1527)  
==13719== by 0x8086D46: ruby\_yyparse (parse.y:3601)  
==13719== by 0x8088AD6: yycompile (parse.y:4626)  
==13719==  
==13719== Use of uninitialised value of size 4  
==13719== at 0x80C3A84: st\_add\_direct (st.c:301)  
==13719== by 0x80BB407: parse\_exp (regparse.c:5046)  
==13719== by 0x80BB9E4: parse\_branch (regparse.c:5223)  
==13719== by 0x80BBB3B: parse\_subexp (regparse.c:5260)  
==13719== by 0x80BBCDC: parse\_regexp (regparse.c:5304)  
==13719== by 0x80BBD8E: onig\_parse\_make\_tree (regparse.c:5331)  
==13719== by 0x80A7B89: onig\_compile (regcomp.c:5364)  
==13719== by 0x809A50F: make\_regexp (re.c:711)  
==13719== by 0x809BF34: rb\_reg\_initialize (re.c:1489)  
==13719== by 0x809C0CD: rb\_reg\_compile (re.c:1527)  
==13719== by 0x8086D46: ruby\_yyparse (parse.y:3601)  
==13719== by 0x8088AD6: yycompile (parse.y:4626)  
warning: useless use of a literal in void context  
==13719==  
==13719== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 19 from  
1)  
==13719== malloc/free: in use at exit: 881,991 bytes in 7,040 blocks.  
==13719== malloc/free: 7,136 allocs, 96 frees, 888,749 bytes allocated.  
==13719== For counts of detected errors, rerun with: -v  
==13719== searching for pointers to 7,040 not-freed blocks.  
==13719== checked 649,916 bytes.  
==13719==  
==13719== LEAK SUMMARY:  
==13719== definitely lost: 0 bytes in 0 blocks.  
==13719== possibly lost: 68 bytes in 1 blocks.  
==13719== still reachable: 881,923 bytes in 7,039 blocks.  
==13719== suppressed: 0 bytes in 0 blocks.  
==13719== Reachable blocks (those to which a pointer was found) are not  
shown.  
==13719== To see them, rerun with: --show-reachable=yes