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

Eric Sandeen
2007-08-31T16:36:22Z

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