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COREDUMPCTL(1) coredumpctl COREDUMPCTL(1)

NAME

coredumpctl - Retrieve and process saved core dumps and metadata

SYNOPSIS

coredumpctl [OPTIONS...] {COMMAND} [PID|COMM|EXE|MATCH...]

DESCRIPTION

coredumpctl is a tool that can be used to retrieve and process core dumps and metadata which were saved by systemd-coredump(8).

OPTIONS

The following options are understood:
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
--no-legend
Do not print column headers.
--no-pager
Do not pipe output into a pager.
-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.

COMMANDS

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 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-coredump(8). 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.

MATCHING

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 journalctl(1)). Must contain an equals sign ("=").

EXIT STATUS

On success, 0 is returned; otherwise, a non-zero failure code is returned. Not finding any matching core dumps is treated as failure.

EXAMPLES

Example 1. List all the core dumps of a program named foo
 
# coredumpctl list foo
Example 2. Invoke gdb on the last core dump
 
# coredumpctl gdb
Example 3. Show information about a process that dumped core, matching by its PID 6654
 
# coredumpctl info 6654
Example 4. Extract the last core dump of /usr/bin/bar to a file named bar.coredump
 
# coredumpctl -o bar.coredump dump /usr/bin/bar

SEE ALSO

systemd-coredump(8), coredump.conf(5), systemd-journald.service(8), gdb(1)
systemd 235