linux-kernel - Re: [PATCH 1/8] signal: Make SIGKILL during coredumps an explicit special case

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Message-ID: <57dfc87c7dd5a2f9f9841bba1185336016595ef7.camel@trillion01.com>
Date:   Mon, 10 Jan 2022 18:00:07 -0500
From:   Olivier Langlois <olivier@...llion01.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "<linux-arch@...r.kernel.org>" <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Alexey Gladkov <legion@...nel.org>,
        Kyle Huey <me@...ehuey.com>, Oleg Nesterov <oleg@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [PATCH 1/8] signal: Make SIGKILL during coredumps an explicit
 special case

On Mon, 2022-01-10 at 15:11 -0600, Eric W. Biederman wrote:
> 
> 
> I have been able to confirm that changing wait_event_interruptible to
> wait_event_killable was the culprit.  Something about the way
> systemd-coredump handles coredumps is not compatible with
> wait_event_killable.

This is my experience too that systemd-coredump is doing something
unexpected. When I tested the patch:
https://lore.kernel.org/lkml/cover.1629655338.git.olivier@trillion01.com/

to make sure that the patch worked, sending coredumps to systemd-
coredump was making systemd-coredump, well, core dump... Not very
useful...

Sending the dumps through a pipe to anything else than systemd-coredump
was working fine.