systemd Developer Zbigniew Jędrzejewski-Szmek zbyszek@in.waw.pl coredumpctl 1 coredumpctl Retrieve and process saved core dumps and metadata coredumpctl OPTIONS COMMAND PID|COMM|EXE|MATCH coredumpctl is a tool that can be used to retrieve and process core dumps and metadata which were saved by systemd-coredump8. The following options are understood: --no-legend Do not print column headers. -1 Show information of a single core dump only, instead of listing all known core dumps. -S --since Only print entries which are since the specified date. -U --until Only print entries which are until the specified date. -r --reverse Reverse output so that the newest entries are displayed first. -F FIELD --field=FIELD Print all possible data values the specified field takes in matching core dump entries of the journal. -o FILE --output=FILE Write the core to FILE. -D DIR --directory=DIR Use the journal files in the specified DIR. -q --quiet Suppresses info messages about lack of access to journal files and possible in-flight coredumps. The following commands are understood: list List core dumps captured in the journal matching specified characteristics. If no command is specified, this is the implied default. The output is designed to be human readable and contains list contains a table with the following columns: TIME The timestamp of the crash, as reported by the kernel. PID The identifier of the process that crashed. UID GID The user and group identifiers of the process that crashed. SIGNAL The signal that caused the process to crash, when applicable. COREFILE Information whether the coredump was stored, and whether it is still accessible: none means the the core was not stored, - means that it was not available (for example because the process was not terminated by a signal), present means that the core file is accessible by the current user, journal means that the core was stored in the journal, truncated is the same as one of the previous two, but the core was too large and was not stored in its entirety, error means that the core file cannot be accessed, most likely because of insufficient permissions, and missing means that the core was stored in a file, but this file has since been removed. EXE The full path to the executable. For backtraces of scripts this is the name of the interpreter. It's worth noting that different restrictions apply to data saved in the journal and core dump files saved in /var/lib/systemd/coredump, see overview in systemd-coredump8. Thus it may very well happen that a particular core dump is still listed in the journal while its corresponding core dump file has already been removed. info Show detailed information about core dumps captured in the journal. dump Extract the last core dump matching specified characteristics. The core dump will be written on standard output, unless an output file is specified with --output=. gdb Invoke the GNU debugger on the last core dump matching specified characteristics. A match can be: PID Process ID of the process that dumped core. An integer. COMM Name of the executable (matches COREDUMP_COMM=). Must not contain slashes. EXE Path to the executable (matches COREDUMP_EXE=). Must contain at least one slash. MATCH General journalctl predicate (see journalctl1). Must contain an equals sign (=). On success, 0 is returned; otherwise, a non-zero failure code is returned. Not finding any matching core dumps is treated as failure. # coredumpctl list foo # coredumpctl gdb # coredumpctl info 6654 # coredumpctl -o bar.coredump dump /usr/bin/bar systemd-coredump8, coredump.conf5, systemd-journald.service8, gdb1