linux-kernel - Re: signals logged / [RFC] log out-of-virtual-memory events

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Message-ID: <20070521124734.GB14802@vanheusden.com>
Date:	Mon, 21 May 2007 14:47:34 +0200
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Andrea Righi <righiandr@...rs.sourceforge.net>,
	Andi Kleen <ak@...e.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: signals logged / [RFC] log out-of-virtual-memory events

> >What about the following enhancement: I check with sig_fatal if it would
> >kill the process and only then emit a message. So when an application
> >takes care itself of handling it nothing is printed.
> >+	/* emit some logging for unhandled signals
> >+	 */
> >+	if (sig_fatal(t, sig))
> Not unhandled_signal()?

Can we already use that one in send_signal? As the signal needs to be
send first I think before we know if it was handled or not? sig_fatal
checks if the handler is set to default - which is it is not taken care
of.

> >+	{
> if (sig_fatal(t, sig)) {
> >+		printk(KERN_WARNING "Sig %d send to %d owned by %d.%d (%s)\n",
> s/send/sent/;
> >+		sig, t -> pid, t -> uid, t -> gid, t -> comm);
> t->pid, t->uid, t->gid, t->comm);


Description:
This patch adds code to the signal-sender making it log a message when
an unhandled fatal signal will be delivered.

Signed-off by: Folkert van Heusden <folkert@...heusden.com>

--- kernel/signal.c.org	2007-05-20 22:47:13.000000000 +0200
+++ kernel/signal.c	2007-05-21 14:46:05.000000000 +0200
@@ -739,6 +739,12 @@
 	struct sigqueue * q = NULL;
 	int ret = 0;
 
+	/* unhandled fatal signals are logged */
+	if (sig_fatal(t, sig)) {
+		printk(KERN_WARNING "Sig %d sent to %d owned by %d.%d (%s)\n",
+		sig, t->pid, t->uid, t->gid, t->comm);
+	}
+
 	/*
 	 * fast-pathed signals for kernel-internal things like SIGSTOP
 	 * or SIGKILL.


Folkert van Heusden

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