talloc & threads in rlm_eap

Arran Cudbard-Bell a.cudbardb at freeradius.org
Sat Jun 21 17:23:22 CEST 2014

On 21 Jun 2014, at 17:20, Arran Cudbard-Bell <a.cudbardb at freeradius.org> wrote:

> On 21 Jun 2014, at 12:13, Phil Mayers <p.mayers at imperial.ac.uk> wrote:
>> Something's still not quite right; I can still trigger a crash with my local config, though it's much much harder. Symptoms look similar i.e. heap corruption, though I've only triggered a few so far.
>> :o(
>> Can't seem to trigger one with a default config, so maybe it's a module I'm using, or maybe the combo of "real" options just makes it more likely and I didn't wait long enough.
>> Will keep poking to see if I can make it more readily reproducible.
> Double frees aren't always due to heap corruption, sometimes it's not reparenting attributes correctly into other contexts, so they get freed when their original parent does.
> If you can get the circular buffer debug stuff working, then you'll be able to see where the double freed VALUE_PAIR was allocated from originally, which will be a big clue.
> As a first diagnostic step i'd try getting rid of calls to rlm_cache and see if that helps. It's the module most likely to experience those kind of reparenting issues.

Ug, its rbtree was parented off its instance data too... just fixed that.

Arran Cudbard-Bell <a.cudbardb at freeradius.org>
FreeRADIUS Development Team

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