Date: Wed, 5 Jun 2019 05:54:12 -0400 From: Farhan Khan <farhan@farhan.codes> To: freebsd-hackers@freebsd.org Subject: Valgrind memcheck showing question marks Message-ID: <20190605095411.GA8120@pc.farhan.codes>
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--PNTmBPCT7hxwcZjr Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi all, I am having a Segmentation fault error and trying to use valgrind to help m= e find where the overflow occurs. I run valgrind on the prog.full version o= f the executable. I am running it as follows: $ valgrind --tool=3Dmemcheck ogit.full [arguments omitted] =3D=3D14457=3D=3D Memcheck, a memory error detector =3D=3D14457=3D=3D Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward = et al. =3D=3D14457=3D=3D Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyr= ight info =3D=3D14457=3D=3D Command: ogit.full clone http://git.farhan.codes/farhan/o= pengit =3D=3D14457=3D=3D=20 =3D=3D14457=3D=3D Conditional jump or move depends on uninitialised value(s) =3D=3D14457=3D=3D at 0x49D1867: ??? (in /lib/libc.so.7) =3D=3D14457=3D=3D by 0x7FF00051F: ??? =3D=3D14457=3D=3D by 0x20DE7D: ??? (in /usr/home/farhan/opengit/ogit.ful= l) =3D=3D14457=3D=3D by 0x20ECE1: ??? (in /usr/home/farhan/opengit/ogit.ful= l) =3D=3D14457=3D=3D by 0x2054B5: ??? (in /usr/home/farhan/opengit/ogit.ful= l) =3D=3D14457=3D=3D by 0x20511A: ??? (in /usr/home/farhan/opengit/ogit.ful= l) =3D=3D14457=3D=3D by 0x4826FFF: ??? =3D=3D14457=3D=3D=20 [snippet] Please note that the stack trace does not show the function names, which I = need. How do I enable those symbols? The Makefile is as follows: ------------------ MAN=3D CFLAGS=3D -Wall -lmd -lz -lfetch =20 PROG=3D ogit SRCS=3D ogit.c lib/ini.c lib/index.c lib/common.c lib/pack.c remote.c ini= t.c \ lib/zlib-handler.c lib/buffering.c lib/loose.c \ hash-object.c update-index.c cat-file.c log.c clone.c index-pack.c CLEANFILES+=3D ${PROG}.core =20 =2Einclude <bsd.prog.mk>=20 ------------------ An example compilation line and the ending is as follows. The first line is= for "index-pack.c", but there are others as the SRCS line shows. ------------------ cc -Wall -lmd -lz -lfetch -g -MD -MF.depend.index-pack.o -MTindex-pack.= o -std=3Dgnu99 -fstack-protector-strong -Qunused-arguments -c index-pac= k.c -o index-pack.o cc -Wall -lmd -lz -lfetch -g -std=3Dgnu99 -fstack-protector-strong -Qunused= -arguments -o ogit.full ogit.o lib/ini.o lib/index.o lib/common.o lib/pac= k.o remote.o init.o lib/zlib-handler.o lib/buffering.o lib/loose.o hash-obj= ect.o update-index.o cat-file.o log.o clone.o index-pack.o =20 objcopy --only-keep-debug ogit.full ogit.debug objcopy --strip-debug --add-gnu-debuglink=3Dogit.debug ogit.full ogit ------------------ Am I missing a necessary compilation flag to have those symbols appear? I h= ave "-g" turned on during compilation. Thanks, --- Farhan Khan PGP Fingerprint: 1312 89CE 663E 1EB2 179C 1C83 C41D 2281 F8DA C0DE --PNTmBPCT7hxwcZjr Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEEG8zEBbZbSkdr8t3eZNYqKtDTorUFAlz3kUMACgkQZNYqKtDT orW/BAwAqMNEN/RO6fnErjKbb3PvwI9TB1xgi0zYgY2tKz01zY7KAqvqR/sA9ldn Yxa5Yaj8hRSvJBHsaUzkbu45JCHfbYmvCLmFb5VLy7Ho26TrePDQS+WXU2Hyd76M SDaEtQ7JR2zWSM9Zq7ZloXBB3Ak1eUUX+xU5Pe137mUi3AGVsqUTELbv4+a7ijV2 RV8PYfPEv+FdXV5OeKUW9rJ1eQ5p4zOAuZuloJvEozmmbuGap8AsmVFLgUpJLvKc yCEfbN3rFRTcPGnETDzldaQslGaW1QM2VFVWdv84j6duPZ6g09lxDvh1jcPaQf29 uLXhgVsPdyeUAHZuMqOo+7NdaUtANfz8IMvqkWchSQ91+N2/gC5AUPRyjH/m24mQ DUyYfy2ndM0Z84NPS8XEg2c5faqH6TCiAKtqKnE5cVOmktHOtxji23aF5hJKtWDW k7f/KNi98O0cPNeXjKMaqs6q1aR7uoCEhGRta7R6g9kZhbUilamDaiEr4zQhrVIC jjGY0Dve =sa2f -----END PGP SIGNATURE----- --PNTmBPCT7hxwcZjr--
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