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man: clarify what is inside/outside the container in coredump info
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@ -178,7 +178,12 @@ COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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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) and owner (UID and GID) of the crashed process.</para>
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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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</listitem>
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</varlistentry>
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@ -199,6 +204,9 @@ COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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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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</listitem>
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</varlistentry>
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@ -207,7 +215,11 @@ COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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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></listitem>
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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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</listitem>
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</varlistentry>
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<varlistentry>
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@ -215,7 +227,11 @@ COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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<term><varname>COREDUMP_USER_UNIT=</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, and the user manager unit. Both fields are only present for user processes.
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</para></listitem>
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</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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</listitem>
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</varlistentry>
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<varlistentry>
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@ -232,6 +248,9 @@ COREDUMP_FILENAME=/var/lib/systemd/coredump/core.Web….552351.….zst
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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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</listitem>
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</varlistentry>
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@ -257,8 +276,17 @@ flags: ...
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_COMM=</varname></term>
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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></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COREDUMP_COMM=</varname></term>
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<term><varname>COREDUMP_PROC_STATUS=</varname></term>
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<term><varname>COREDUMP_PROC_MAPS=</varname></term>
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<term><varname>COREDUMP_PROC_LIMITS=</varname></term>
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@ -284,7 +312,10 @@ flags: ...
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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></listitem>
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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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</listitem>
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</varlistentry>
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<varlistentry>
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