Re: [PATCH] emit logging when a process receives a fatal signal

[Oleg Verych <olecom@flower.upol.cz>]

On 2006-11-18, Folkert van Heusden wrote:
> Hi,
>
> I found that sometimes processes disappear on some heavily used system
> of mine without any logging. So I've written a patch against 2.6.18.2
> which emits logging when a process emits a fatal signal.

Why not to patch default signal handlers in glibc, to have not only
stderr, but syslog, or /dev/kmsg copy of fatal messages?

> Signed-off-by: Folkert van Heusden <folkert@vanheusden.com>
>
> --- linux-2.6.18.2/kernel/signal.c	2006-11-04 02:33:58.000000000 +0100
> +++ linux-2.6.18.2.new/kernel/signal.c	2006-11-17 15:59:13.000000000 +0100
> @@ -706,6 +706,15 @@
>  	struct sigqueue * q = NULL;
>  	int ret = 0;
>  
> +	if (sig == SIGQUIT || sig == SIGILL  || sig == SIGTRAP ||
> +	    sig == SIGABRT || sig == SIGBUS  || sig == SIGFPE  ||
> +	    sig == SIGSEGV || sig == SIGXCPU || sig == SIGXFSZ ||
> +	    sig == SIGSYS  || sig == SIGSTKFLT)
> +	{
> +		printk(KERN_WARNING "Sig %d send 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
>
> www.vanheusden.com/multitail - multitail is tail on steroids. multiple
>                windows, filtering, coloring, anything you can think of
> ----------------------------------------------------------------------
> Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com