mirror of
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4cafd1a21f
In the troff output, this doesn't seem to make any difference. But in the
html output, the whitespace is sometimes preserved, creating an additional
gap before the following content. Drop it everywhere to avoid this.
(cherry picked from commit fe45f8dc9b)
499 lines
24 KiB
XML
499 lines
24 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-coredump" conditional='ENABLE_COREDUMP'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-coredump</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-coredump</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-coredump</refname>
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<refname>systemd-coredump.socket</refname>
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<refname>systemd-coredump@.service</refname>
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<refpurpose>Acquire, save and process core dumps</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/systemd-coredump</filename></para>
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<para><filename>/usr/lib/systemd/systemd-coredump</filename> <option>--backtrace</option></para>
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<para><filename>systemd-coredump@.service</filename></para>
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<para><filename>systemd-coredump.socket</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-coredump@.service</filename> is a system service to process core dumps. It will
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log a summary of the event to
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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including information about the process identifier, owner, the signal that killed the process, and the
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stack trace if possible. It may also save the core dump for later processing. See the "Information about
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the crashed process" section below.</para>
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<para>The behavior of a specific program upon reception of a signal is governed by a few
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factors which are described in detail in
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<citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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In particular, the core dump will only be processed when the related resource limits are sufficient.
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</para>
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<para>Core dumps can be written to the journal or saved as a file. In both cases, they can be retrieved
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for further processing, for example in
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<citerefentry project='man-pages'><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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See <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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in particular the <command>list</command> and <command>debug</command> verbs.</para>
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<para>By default, <command>systemd-coredump</command> will log the core dump to the journal, including a
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backtrace if possible, and store the core dump (an image of the memory contents of the process) itself in
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an external file in <filename>/var/lib/systemd/coredump</filename>. These core dumps are deleted after a
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few days by default; see <filename>/usr/lib/tmpfiles.d/systemd.conf</filename> for details. Note that the
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removal of core files from the file system and the purging of journal entries are independent, and the
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core file may be present without the journal entry, and journal entries may point to since-removed core
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files. Some metadata is attached to core files in the form of extended attributes, so the core files are
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useful for some purposes even without the full metadata available in the journal entry.</para>
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<para>For further details see <ulink url="https://systemd.io/COREDUMP">systemd Coredump
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Handling</ulink>.</para>
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<refsect2>
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<title>Invocation of <command>systemd-coredump</command></title>
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<para>The <command>systemd-coredump</command> executable does the actual work. It is invoked twice:
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once as the handler by the kernel, and the second time in the
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<filename>systemd-coredump@.service</filename> to actually write the data to the journal and process
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and save the core file.</para>
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<para>When the kernel invokes <command>systemd-coredump</command> to handle a core dump, it runs in
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privileged mode, and will connect to the socket created by the
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<filename>systemd-coredump.socket</filename> unit, which in turn will spawn an unprivileged
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<filename>systemd-coredump@.service</filename> instance to process the core dump. Hence
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<filename>systemd-coredump.socket</filename> and <filename>systemd-coredump@.service</filename> are
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helper units which do the actual processing of core dumps and are subject to normal service
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management.</para>
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<para>It is also possible to invoke <command>systemd-coredump</command> with
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<option>--backtrace</option> option. In this case, <command>systemd-coredump</command> expects a
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journal entry in the journal
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<ulink url="https://systemd.io/JOURNAL_EXPORT_FORMATS#journal-export-format">Journal Export Format</ulink>
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on standard input. The entry should contain a <varname>MESSAGE=</varname> field and any additional
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metadata fields the caller deems reasonable. <command>systemd-coredump</command> will append additional
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metadata fields in the same way it does for core dumps received from the kernel. In this mode, no core
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dump is stored in the journal.</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Configuration</title>
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<para>For programs started by <command>systemd</command>, process resource limits can be set by directive
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<varname>LimitCORE=</varname>, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>In order to be used by the kernel to handle core dumps,
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<command>systemd-coredump</command> must be configured in
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<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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parameter <varname>kernel.core_pattern</varname>. The syntax of this parameter is explained in
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<citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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systemd installs the file <filename>/usr/lib/sysctl.d/50-coredump.conf</filename> which configures
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<varname>kernel.core_pattern</varname> accordingly. This file may be masked or overridden to use a different
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setting following normal
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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rules. If the sysctl configuration is modified, it must be updated in the kernel before it
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takes effect, see
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<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>systemd-sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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<para>In order to be used in the <option>--backtrace</option> mode, an appropriate backtrace
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handler must be installed on the sender side. For example, in case of
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<citerefentry project='die-net'><refentrytitle>python</refentrytitle><manvolnum>1</manvolnum></citerefentry>, this
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means a <varname>sys.excepthook</varname> must be installed, see
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<ulink url="https://github.com/systemd/systemd-coredump-python">systemd-coredump-python</ulink>.
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</para>
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<para>The behavior of <command>systemd-coredump</command> itself is configured through the configuration file
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<filename>/etc/systemd/coredump.conf</filename> and corresponding snippets
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<filename>/etc/systemd/coredump.conf.d/*.conf</filename>, see
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<citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. A new
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instance of <command>systemd-coredump</command> is invoked upon receiving every core dump. Therefore, changes
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in these files will take effect the next time a core dump is received.</para>
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<para>Resources used by core dump files are restricted in two ways. Parameters like maximum size of acquired
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core dumps and files can be set in files <filename>/etc/systemd/coredump.conf</filename> and snippets mentioned
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above. In addition the storage time of core dump files is restricted by <command>systemd-tmpfiles</command>,
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corresponding settings are by default in <filename>/usr/lib/tmpfiles.d/systemd.conf</filename>. The default is
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to delete core dumps after a few days; see the above file for details.</para>
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<refsect2>
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<title>Disabling coredump processing</title>
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<para>To disable potentially resource-intensive processing by <command>systemd-coredump</command>, set
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<programlisting>Storage=none
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ProcessSizeMax=0</programlisting> in
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<citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Information about the crashed process</title>
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<para><citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> can
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be used to retrieve saved core dumps independently of their location, to display information, and to
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process them e.g. by passing to the GNU debugger (gdb).</para>
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<para>Data stored in the journal can be also viewed with
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> as usual
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(or from any other process, using the
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<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry> API).
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The relevant messages have <constant>MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1</constant>:</para>
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<programlisting>$ journalctl MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1 -o verbose
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…
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MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1
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COREDUMP_PID=552351
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COREDUMP_UID=1000
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COREDUMP_GID=1000
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COREDUMP_SIGNAL_NAME=SIGSEGV
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COREDUMP_SIGNAL=11
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COREDUMP_TIMESTAMP=1614342930000000
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COREDUMP_COMM=Web Content
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COREDUMP_EXE=/usr/lib64/firefox/firefox
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COREDUMP_USER_UNIT=app-gnome-firefox-552136.scope
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COREDUMP_CMDLINE=/usr/lib64/firefox/firefox -contentproc -childID 5 -isForBrowser …
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COREDUMP_CGROUP=/user.slice/user-1000.slice/user@1000.service/app.slice/app-….scope
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COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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…
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</programlisting>
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<para>The following fields are saved (if known) with the journal entry</para>
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<variablelist class='journal-directives'>
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<varlistentry>
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<term><varname>COREDUMP_UID=</varname></term>
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<term><varname>COREDUMP_PID=</varname></term>
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<term><varname>COREDUMP_GID=</varname></term>
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<listitem><para>The process number (PID), owner user number (UID), and group number (GID) of the
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crashed process.</para>
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<para>When the crashed process was part of a container (or in a process or user namespace in
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general), those are the values as seen <emphasis>outside</emphasis>, in the namespace where
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<filename>systemd-coredump</filename> is running.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_TIMESTAMP=</varname></term>
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<listitem><para>The time of the crash as reported by the kernel (in μs since the epoch).</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_RLIMIT=</varname></term>
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<listitem><para>The core file size soft resource limit, see
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<citerefentry project='man-pages'><refentrytitle>getrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>.
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</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_UNIT=</varname></term>
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<term><varname>COREDUMP_SLICE=</varname></term>
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<listitem><para>The system unit and slice names.</para>
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<para>When the crashed process was in container, those are the units names
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<emphasis>outside</emphasis>, in the main system manager.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_CGROUP=</varname></term>
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<listitem><para>The primary cgroup of the unit of the crashed process.</para>
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<para>When the crashed process was in a container, this is the full path, as seen outside of the
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container.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_PROC_CGROUP=</varname></term>
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<listitem><para>Control group information in the format used in
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<filename>/proc/self/cgroup</filename>. On systems with the unified cgroup hierarchy, this is a
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single path prefixed with <literal>0::</literal>, and multiple paths prefixed with controller numbers
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on legacy systems.</para>
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<para>When the crashed process was in a container, this is the full path, as seen outside of the
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container.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_OWNER_UID=</varname></term>
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<term><varname>COREDUMP_USER_UNIT=</varname></term>
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<term><varname>COREDUMP_SESSION=</varname></term>
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<listitem><para>The numerical UID of the user owning the login session or systemd user unit of the
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crashed process, the user manager unit, and the session identifier. All three fields are only present
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for user processes.</para>
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<para>When the crashed process was in container, those are the values <emphasis>outside</emphasis>,
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in the main system.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_SIGNAL_NAME=</varname></term>
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<term><varname>COREDUMP_SIGNAL=</varname></term>
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<listitem><para>The terminating signal name (with the <literal>SIG</literal> prefix
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<footnote><para><citerefentry
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project='man-pages'><refentrytitle>kill</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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expects signal names <emphasis>without</emphasis> the prefix; <citerefentry
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project='man-pages'><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry> uses
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the prefix; all systemd tools accept signal names both with and without the prefix.
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</para></footnote>) and numerical value. (Both are included because signal numbers vary by
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architecture.)</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_CWD=</varname></term>
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<term><varname>COREDUMP_ROOT=</varname></term>
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<listitem><para>The current working directory and root directory of the crashed process.</para>
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<para>When the crashed process is in a container, those paths are relative to the root of the
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container's mount namespace.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_OPEN_FDS=</varname></term>
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<listitem><para>Information about open file descriptors, in the following format:</para>
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<programlisting><replaceable>fd</replaceable>:<replaceable>/path/to/file</replaceable>
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pos: ...
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flags: ...
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...
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<replaceable>fd</replaceable>:<replaceable>/path/to/file</replaceable>
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pos: ...
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flags: ...
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...
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</programlisting>
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<para>The first line contains the file descriptor number <replaceable>fd</replaceable> and the path,
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while subsequent lines show the contents of
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<filename>/proc/<replaceable>pid</replaceable>/fdinfo/<replaceable>fd</replaceable></filename>.
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</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_EXE=</varname></term>
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<listitem><para>The destination of the <filename>/proc/<replaceable>pid</replaceable>/exe</filename>
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symlink.</para>
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<para>When the crashed process is in a container, that path is relative to the root of the
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container's mount namespace.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_CMDLINE=</varname></term>
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<term><varname>COREDUMP_COMM=</varname></term>
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<term><varname>COREDUMP_ENVIRON=</varname></term>
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<term><varname>COREDUMP_PROC_AUXV=</varname></term>
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<term><varname>COREDUMP_PROC_LIMITS=</varname></term>
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<term><varname>COREDUMP_PROC_MAPS=</varname></term>
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<term><varname>COREDUMP_PROC_MOUNTINFO=</varname></term>
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<term><varname>COREDUMP_PROC_STATUS=</varname></term>
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<listitem><para>Fields that map the per-process entries in the <filename>/proc/</filename>
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filesystem: <filename>/proc/<replaceable>pid</replaceable>/cmdline</filename> (the command line of
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the crashed process), <filename>/proc/<replaceable>pid</replaceable>/comm</filename> (the command
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name associated with the process), <filename>/proc/<replaceable>pid</replaceable>/environ</filename>
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(the environment block of the crashed process),
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<filename>/proc/<replaceable>pid</replaceable>/auxv</filename> (the auxiliary vector of the crashed
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process, see <citerefentry
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project='man-pages'><refentrytitle>getauxval</refentrytitle><manvolnum>3</manvolnum></citerefentry>),
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<filename>/proc/<replaceable>pid</replaceable>/limits</filename> (the soft and hard resource limits),
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<filename>/proc/<replaceable>pid</replaceable>/maps</filename> (memory regions visible to the process
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and their access permissions), <filename>/proc/<replaceable>pid</replaceable>/mountinfo</filename>
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(mount points in the process's mount namespace),
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<filename>/proc/<replaceable>pid</replaceable>/status</filename> (various metadata about the
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process).</para>
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<para>See
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<citerefentry project='man-pages'><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_HOSTNAME=</varname></term>
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<listitem><para>The system hostname.</para>
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<para>When the crashed process was in container, this is the container hostname.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_CONTAINER_CMDLINE=</varname></term>
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<listitem><para>For processes running in a container, the command line of the process spawning the
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container (the first parent process with a different mount namespace).</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP=</varname></term>
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<listitem><para>When the core is stored in the journal, the core image itself.</para>
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<xi:include href="version-info.xml" xpointer="v248"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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|
<term><varname>COREDUMP_FILENAME=</varname></term>
|
|
|
|
<listitem><para>When the core is stored externally, the path to the core file.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v248"/>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>COREDUMP_TRUNCATED=</varname></term>
|
|
|
|
<listitem><para>Set to <literal>1</literal> when the saved coredump was truncated. (A partial core
|
|
image may still be processed by some tools, though obviously not all information is available.)
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>COREDUMP_PACKAGE_NAME=</varname></term>
|
|
<term><varname>COREDUMP_PACKAGE_VERSION=</varname></term>
|
|
<term><varname>COREDUMP_PACKAGE_JSON=</varname></term>
|
|
|
|
<listitem><para>If the executable contained .package metadata ELF notes, they will be
|
|
parsed and attached. The <varname>package</varname> and <varname>packageVersion</varname>
|
|
of the 'main' ELF module (ie: the executable) will be appended individually. The
|
|
JSON-formatted content of all modules will be appended as a single JSON object, each with
|
|
the module name as the key. For more information about this metadata format and content, see
|
|
<ulink url="https://systemd.io/COREDUMP_PACKAGE_METADATA/">the coredump metadata spec</ulink>.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v249"/>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>MESSAGE=</varname></term>
|
|
|
|
<listitem><para>The message generated by <command>systemd-coredump</command> that includes the
|
|
backtrace if it was successfully generated. When <command>systemd-coredump</command> is invoked with
|
|
<option>--backtrace</option>, this field is provided by the caller.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
<para>Various other fields exist in the journal entry, but pertain to the logging process,
|
|
i.e. <command>systemd-coredump</command>, not the crashed process. See
|
|
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
|
|
</para>
|
|
|
|
<para>The following fields are saved (if known) with the external file listed in
|
|
<varname>COREDUMP_FILENAME=</varname> as extended attributes:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><varname>user.coredump.pid</varname></term>
|
|
<term><varname>user.coredump.uid</varname></term>
|
|
<term><varname>user.coredump.gid</varname></term>
|
|
<term><varname>user.coredump.signal</varname></term>
|
|
<term><varname>user.coredump.timestamp</varname></term>
|
|
<term><varname>user.coredump.rlimit</varname></term>
|
|
<term><varname>user.coredump.hostname</varname></term>
|
|
<term><varname>user.coredump.comm</varname></term>
|
|
<term><varname>user.coredump.exe</varname></term>
|
|
|
|
<listitem><para>Those are the same as <varname>COREDUMP_PID=</varname>,
|
|
<varname>COREDUMP_UID=</varname>, <varname>COREDUMP_GID=</varname>,
|
|
<varname>COREDUMP_SIGNAL=</varname>, <varname>COREDUMP_TIMESTAMP=</varname>,
|
|
<varname>COREDUMP_RLIMIT=</varname>, <varname>COREDUMP_HOSTNAME=</varname>,
|
|
<varname>COREDUMP_COMM=</varname>, and <varname>COREDUMP_EXE=</varname>, described above.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
<para>Those can be viewed using
|
|
<citerefentry project='man-pages'><refentrytitle>getfattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
|
|
For the core file described in the journal entry shown above:
|
|
<programlisting>$ getfattr --absolute-names -d /var/lib/systemd/coredump/core.Web….552351.….zst
|
|
# file: /var/lib/systemd/coredump/core.Web….552351.….zst
|
|
user.coredump.pid="552351"
|
|
user.coredump.uid="1000"
|
|
user.coredump.gid="1000"
|
|
user.coredump.signal="11"
|
|
user.coredump.timestamp="1614342930000000"
|
|
user.coredump.comm="Web Content"
|
|
user.coredump.exe="/usr/lib64/firefox/firefox"
|
|
…
|
|
</programlisting>
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><ulink url="https://systemd.io/COREDUMP">systemd Coredump Handling</ulink></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
</refentry>
|