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.
---
Reply to this email directly or view it on GitHub:
https://github.com/OpenSIPS/opensips/issues/721#issuecomment-163245165
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