Re: [LTP] [PATCH v2 1/1] kill11: Skip pipe-based core dumps per signal

[Andrea Cervesato via ltp <ltp@lists.linux.it>]

> Hi!
> > > Well either we do that, or we skip the signals that dump core when we
> > > are dumping into the pipe.
> > 
> > To me it looks good to skip the signals which are not allowing child
> > to be killed after coredump. It's a systemd feature we can't workaround
> > in this case.
> 
> Thinking of it once more, I wonder what exactly fails in the
> systemd-coredump case. I guess that it may delay the test execution a
> bit but the crashed process should eventualy quit and the test wait()
> call should collect it. If that wasn't the case systemd-coredump would
> break one of the fundamentals of UNIX process management.

Let's forget about systemd for a second.

The problem is that by using `pause()` that is not draining the buffer we
never ends the piped user-space helper. The default behaviour for a piped
helper is that kernel collect the coredump until helper drains the pipe.

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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