[OpenSIPS-Devel] [opensips] SIGSEGV in pkg_malloc/fm_malloc (#721)

[Răzvan Crainea]

As detailed in #722, the ```->prev``` should never be ```NULL```, otherwise the fragment is in use by somebody else and cannot be in the ```qm->free_hash``` hash.
Here we seem to have a situation where the memory allocator sees the fragment as being free and tries to use it, but in the same time somebody else comes and takes it. Unfortunately we did not solved this concurrency issue yet, but we are tracking it.

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