Re: Need advice on how to debug

On 23 Jan 2004, at 15:07, Henrik Nordstrom <hno@squid-cache.org> wrote:

> On Fri, 23 Jan 2004, Andres Kroonmaa wrote:
>
> > This works with 3.0 only. But for fun, I tried to extract latest probe
> > trace from a core I had. After some scripting, you'd get something like
> > this, which is intact even when stack is completely smashed.
>
> Cool.
>
> It would be quite interesting to add something like this in the SEGV
> handler of Squid-3.

 Is it worth the effort? have core and with scripts its easier.
 I think for more general approach, it would make sense to arrange ifdefed
 code that creates some global ringbuffer, global counter, and debug() macros
 to do something like: array[index++ & 0xff] = __FUNCTION__ besides other stuff.

 This would leave more precise and verbose trace of last N^2 debug statements
 that have been passed. After you identify the function that crashes, you
 can take approach I suggested initially to catch the crash with gdb and
 have full backtrace just before stack gets smashed.

------------------------------------
 Andres Kroonmaa <andre@online.ee>
 CTO, Microlink Data AS
 Tel: 6501 731, Fax: 6501 725
 Pärnu mnt. 158, Tallinn
 11317 Estonia
Received on Fri Jan 23 2004 - 08:34:54 MST