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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[-- Attachment #1 --] Hi all, I am having a Segmentation fault error and trying to use valgrind to help me find where the overflow occurs. I run valgrind on the prog.full version of the executable. I am running it as follows: $ valgrind --tool=memcheck ogit.full [arguments omitted] ==14457== Memcheck, a memory error detector ==14457== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. ==14457== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info ==14457== Command: ogit.full clone http://git.farhan.codes/farhan/opengit ==14457== ==14457== Conditional jump or move depends on uninitialised value(s) ==14457== at 0x49D1867: ??? (in /lib/libc.so.7) ==14457== by 0x7FF00051F: ??? ==14457== by 0x20DE7D: ??? (in /usr/home/farhan/opengit/ogit.full) ==14457== by 0x20ECE1: ??? (in /usr/home/farhan/opengit/ogit.full) ==14457== by 0x2054B5: ??? (in /usr/home/farhan/opengit/ogit.full) ==14457== by 0x20511A: ??? (in /usr/home/farhan/opengit/ogit.full) ==14457== by 0x4826FFF: ??? ==14457== [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= CFLAGS= -Wall -lmd -lz -lfetch PROG= ogit SRCS= ogit.c lib/ini.c lib/index.c lib/common.c lib/pack.c remote.c init.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+= ${PROG}.core .include <bsd.prog.mk> ------------------ 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=gnu99 -fstack-protector-strong -Qunused-arguments -c index-pack.c -o index-pack.o cc -Wall -lmd -lz -lfetch -g -std=gnu99 -fstack-protector-strong -Qunused-arguments -o ogit.full ogit.o lib/ini.o lib/index.o lib/common.o lib/pack.o remote.o init.o lib/zlib-handler.o lib/buffering.o lib/loose.o hash-object.o update-index.o cat-file.o log.o clone.o index-pack.o objcopy --only-keep-debug ogit.full ogit.debug objcopy --strip-debug --add-gnu-debuglink=ogit.debug ogit.full ogit ------------------ Am I missing a necessary compilation flag to have those symbols appear? I have "-g" turned on during compilation. Thanks, --- Farhan Khan PGP Fingerprint: 1312 89CE 663E 1EB2 179C 1C83 C41D 2281 F8DA C0DE [-- Attachment #2 --] -----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-----help
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