The pv_get_buffer() return the pointer of the allocated buffer, which should be aligned:

3593		p = pv_get_buffer();
3594		memcpy(p, in->s, in->len);

That means there is a buffer overflow/memory overwrite in one of the components you use. If you can narrow it down to a minimal config, it would help a lot. Also, knowing if default kamailio.cfg + append_hf_value() works or not would help to rule out many modules.

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