Hi,there's a bug in the current 2.4.x branch of httpd which leads to crashes for SSL renegotiations.
The variable "ctx" is always NULL in ssl_engine_kernel.c, ssl_hook_Access_classic(), and it's used here:
if (!(cert_store || (cert_store = SSL_CTX_get_cert_store(ctx)))) ...In trunk, this bug has been fixed in r1828793. Please backport this for 2.4.37.