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Message-ID: <YVifGtn3LctrWOwg@zeniv-ca.linux.org.uk>
Date: Sat, 2 Oct 2021 18:04:10 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Alexander Popov <alex.popov@...ux.com>
Cc: Jonathan Corbet <corbet@....net>, Paul McKenney <paulmck@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
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Subject: Re: [PATCH] Introduce the pkill_on_warn boot parameter
On Wed, Sep 29, 2021 at 09:58:23PM +0300, Alexander Popov wrote:
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -53,6 +53,7 @@ static int pause_on_oops_flag;
> static DEFINE_SPINLOCK(pause_on_oops_lock);
> bool crash_kexec_post_notifiers;
> int panic_on_warn __read_mostly;
> +int pkill_on_warn __read_mostly;
> unsigned long panic_on_taint;
> bool panic_on_taint_nousertaint = false;
>
> @@ -610,6 +611,9 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
>
> print_oops_end_marker();
>
> + if (pkill_on_warn && system_state >= SYSTEM_RUNNING)
> + do_group_exit(SIGKILL);
> +
Wait a sec... do_group_exit() is very much not locking-neutral.
Aren't you introducing a bunch of potential deadlocks by adding
that?
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