Yet another crash in FreeBSD 5.1
Greg 'groggy' Lehey
grog at FreeBSD.org
Sat Aug 2 18:17:29 PDT 2003
On Saturday, 2 August 2003 at 17:56:49 -0700, Terry Lambert wrote:
> Greg 'groggy' Lehey wrote:
>>> You don't actually need a crash dump to debug a stack traceback.
>>
>> Great! So you know the answer? Please submit a patch.
>>
>> Seriously, this is nonsense. Yes, it's a null pointer dereference.
>> What?
>
> That is precisely what doing what I suggested discovers, Greg.
Yes, that's what you said already.
> If you haven't seen his response posting:
I saw it and explained why it didn't help.
> Clearly, bp2 or bp is NULL at the time of the dereference.
>
>> Why?
>
> Programmer error. Either bp2 or bp is a NULL pointer.
You're repeating yourself.
>> How do you fix it?
>
> It depends on the root cause.
*bingo* Here you are having found the first (obvious) step and acting
as if the problem has been solved.
> I really can't answer it
OK, why don't you either:
1. Find a way to answer it, or
2. Keep quiet.
You're just confusing the issue here.
>> Finding the first step doesn't solve the problem.
>
> No. Finding the first step is *necessary* to solving the problem,
> but you are entirely correct in pointing out that it's not in
> itself *sufficient*.
>
> But it's one step farther along than he was. I didn't see anyone
> else helping him take that first step, so I did.
Sorry, I don't hack in the middle of the night. If you had read the
documentation at your disposal, you'd have discovered a lot of help,
and also that this is a known problem that crops up sporadically, and
that so far we can't find out why.
Greg
--
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