Date: Mon, 19 Sep 2011 12:57:19 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Unga <unga888@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: Segmentation fault, _malloc_prefork () - debugging help needed Message-ID: <20110919175719.GI9801@dan.emsphone.com> In-Reply-To: <1316347805.62034.YahooMailClassic@web160112.mail.bf1.yahoo.com> References: <1316347805.62034.YahooMailClassic@web160112.mail.bf1.yahoo.com>
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In the last episode (Sep 18), Unga said: > I'm developing an multi-threaded application on FreeBSD. > > When it is running for sometime, it develops a Segmentation fault. > > The ddd debugger shows following: > Program received signal SIGSEGV, Segmentation fault. > [Switching to Thread 296c6580 (LWP 100137)] > 0x28ee390e in _malloc_prefork () from /lib/libc.so.7 > > How could I know the exact line in source where this issue develops? If you have a full /usr/src tree extracted, you can edit /usr/src/lib/libc/Makefile and add DEBUG_FLAGS=-g at the top, then run "make obj && make depend && make && make install" to install the new libc with debugging symbols. Then your debugger will show more info for functions inside libc. If you don't have a source tree checked out yet, install the devel/subversion-freebsd port, cd into /usr/src/ and run svn co svn://svn.freebsd.org/base/stable/8 . (or base/release/8.2.0, or base/stable/7 or base/head, depending on which version you want; you can browse the branches at http://svnweb.freebsd.org/base/ before you checkout anything) -- Dan Nelson dnelson@allantgroup.com
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