In all coredumps collected by systemd-coredump and retrieved with coredumpctl, I fail to run gdb with: BFD: Warning: /home/giovanni/core is truncated: expected core file size >= 449388544, found: 25165824. And the resulting coredump is completely unusable (not even a backtrace or the failure signal). Looking at coredump.c, I see a maximum limit of 24M, which is not enough. This limit should increased, or at least made configurable.
The limits is now 768*1024*1024 bytes which should be enough for most cases. This is also what systemd-journald allows [1]. [1] http://cgit.freedesktop.org/systemd/systemd/commit/?id=c4aa09b
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