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

[Eric Sandeen <sandeen@redhat.com>]

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