linux-kernel - Re: [RFC][PATCH] detect & print stack overruns at oops time

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Message-ID: <46D8437B.3010705@redhat.com>
Date:	Fri, 31 Aug 2007 11:36:11 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	linux-kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] detect & print stack overruns at oops time

Randy Dunlap wrote:
> On Fri, 31 Aug 2007 00:28:58 -0500 Eric Sandeen wrote:
> 
>> Index: linux-2.6.22-rc4/arch/i386/mm/fault.c
>> ===================================================================
>> --- linux-2.6.22-rc4.orig/arch/i386/mm/fault.c
>> +++ linux-2.6.22-rc4/arch/i386/mm/fault.c
>> @@ -543,6 +545,27 @@ no_context:
>>  			printk(KERN_ALERT "BUG: unable to handle kernel paging"
>>  					" request");
>>  		printk(" at virtual address %08lx\n",address);
>> +
>> +		overrun = (unsigned long)stackend - (unsigned long)(&regs->esp);
>> +		if (overrun > 0) {
>> +			printk(KERN_ALERT "Thread overrunning stack by %d "
>> +							"bytes\n", overrun);
>> +		} else {
> 
> Hi,
> 
> Is there something that tells us what <Thread> is doing all of this
> bad juju?

Sure, the rest of the oops report will.

-Eric
-
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