linux-kernel - Re: SIGCHLD signal sometimes sent with si

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Message-ID: <87v9ls51gk.fsf@x220.int.ebiederm.org>
Date:   Tue, 21 Apr 2020 09:59:39 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Christof Meerwald <cmeerw@...erw.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: SIGCHLD signal sometimes sent with si_pid==0 (Linux 5.6.5)

Christof Meerwald <cmeerw@...erw.org> writes:

> Hi,
>
> this is probably related to commit
> 7a0cf094944e2540758b7f957eb6846d5126f535 (signal: Correct namespace
> fixups of si_pid and si_uid).
>
> With a 5.6.5 kernel I am seeing SIGCHLD signals that don't include a
> properly set si_pid field - this seems to happen for multi-threaded
> child processes.

Christof I want to say very good spotting and reporting of this issue.

Thank you.
Eric