Date: Mon, 4 Oct 2021 12:00:38 +0300 From: Yuri <yuri@aetern.org> To: questions <questions@freebsd.org> Subject: Re: How do I get a coredump file from an application? Message-ID: <f355b1bf-2c27-201f-3eaf-fd9e13e58f3c@aetern.org> In-Reply-To: <CAAdA2WPSfnbWLi3FZYmqONCYGg_7wgEObq8TzKbaY-cd8G13yw@mail.gmail.com> References: <CAAdA2WPSfnbWLi3FZYmqONCYGg_7wgEObq8TzKbaY-cd8G13yw@mail.gmail.com>
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Odhiambo Washington wrote: > Hi > > root@gw:/var/log/exim # freebsd-version -kru > 13.0-RELEASE-p4 > 13.0-RELEASE-p4 > 13.0-RELEASE-p4 > > > I have my MTA (Exim) crushing, with the following message in its panic.log: > > 2021-10-01 04:10:58 SIGSEGV (maybe attempt to write to immutable memory) > 2021-10-01 04:11:26 SIGSEGV (maybe attempt to write to immutable memory) > 2021-10-01 04:11:30 SIGSEGV (maybe attempt to write to immutable memory) > 2021-10-01 04:11:35 SIGSEGV (maybe attempt to write to immutable memory) > > I need to obtain a coredump file from the crashing process for debugging > purposes. > > I have manually compiled the application with the following option: > CC=clang -ggdb > CXX=clang++ > CPP=clang-cpp Don't. Use the following knob documented in ports(7) and (somewhat more verbose) in /usr/ports/Mk/bsd.port.mk: # WITH_DEBUG - If set, debugging flags are added to CFLAGS and the # binaries don't get stripped by INSTALL_PROGRAM or # INSTALL_LIB. Besides, individual ports might # add their specific to produce binaries for debugging # purposes. You can override the debug flags that are # passed to the compiler by setting DEBUG_FLAGS. It is # set to "-g" at default. > With the hopes that the binary will then come with debugging symbols. > > Additionally, I have done the following: > > mkdir -p /var/coredumps > chmod 1777 /var/coredumps > > Added the following to /etc/sysctl.conf: > > kern.corefile=/var/coredumps/%U/%N.core > kern.coredump=1 > > And finally: > > sysctl -w kern.coredump=1 > sysctl -w kern.corefile=/var/coredumps/%U/%N.core > sysctl -w kern.sugid_coredump=1 (this actually seems to be the default) > > Is this all that I need to do or am I missing something crucial in this > endeavor? Never used exim so guessing - you likely need to tell exim to actually dump the core.
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