linux-kernel - Re: [PATCH 0/2]: Fixing unkillable processes caused by SIGHUP timers

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Message-ID: <CACT4Y+ZuJ5N03FsGn1cj9KUy6b_VZcNWfU3kFJFZugcyyi13zg@mail.gmail.com>
Date:   Thu, 7 Feb 2019 12:46:52 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        jolsa@...hat.com, Namhyung Kim <namhyung@...nel.org>,
        luca abeni <luca.abeni@...tannapisa.it>,
        syzkaller <syzkaller@...glegroups.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH 0/2]: Fixing unkillable processes caused by SIGHUP timers

On Thu, Feb 7, 2019 at 7:43 AM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
>
> Dmitry,
>
> Can you please verify the follow two patches.  The first one is a
> simplification of the one you have already tested and makes the
> processes killable.  The second patch improves our heuristic for
> detecting synchronous like SIGSEGV when the stack overflows allowing us
> to process them before SIGHUP.
>
> Eric W. Biederman (2):
>       signal: Always notice exiting tasks
>       signal: Better detection of synchronous signals

With these 2 patches applied the test program immediately exits with
"Segmentation fault".
Tested-by: Dmitry Vyukov <dvyukov@...gle.com>