source: mod_gnutls/test/suppressions.valgrind @ 10100a2

# The first call to gnutls_rng in a new thread causes a "possible
# loss" setting up thread-local storage (TLS). According to search
# results that seems to be a common issue with glibc.
{
   gnutls_rng_init
   Memcheck:Leak
   match-leak-kinds: possible
   fun:malloc
   ...
   fun:__tls_get_addr
   ...
   fun:gnutls_rnd
   fun:gnutls_ocsp_req_randomize_nonce
   ...
   fun:mgs_async_ocsp_update
   fun:*
   fun:start_thread
   fun:clone
}

# Whatever mod_watchdog does setting up its threads, it involves
# thread-local storage, too.
{
   watchdog_child_thread_init
   Memcheck:Leak
   match-leak-kinds: possible
   fun:calloc
   fun:allocate_dtv
   fun:_dl_allocate_tls
   fun:allocate_stack
   fun:pthread_create@*
   obj:/usr/sbin/apache2
   ...
   fun:ap_run_child_init
   obj:/usr/lib/apache2/modules/mod_mpm_*.so
   ...
   obj:/usr/lib/apache2/modules/mod_mpm_*.so
   fun:ap_run_mpm
   ...
}

# mod_http2 needs thread-local storage, too.
{
   http2_child_thread_init
   Memcheck:Leak
   match-leak-kinds: possible
   fun:calloc
   fun:allocate_dtv
   fun:_dl_allocate_tls
   fun:allocate_stack
   fun:pthread_create@*
   obj:/usr/lib/apache2/modules/mod_http2.so
   ...
   obj:/usr/lib/apache2/modules/mod_http2.so
   fun:ap_run_child_init
   obj:/usr/lib/apache2/modules/mod_mpm_*.so
   ...
}

# There's a bunch of reports of leaks from getaddrinfo, but outside
# the scope of mod_gnutls to fix.
{
   apr_getaddrinfo_leak
   Memcheck:Leak
   match-leak-kinds: definite
   fun:malloc
   ...
   fun:getaddrinfo
   obj:/usr/lib/*/libapr-1.so.*
   ...
}

# Whatever OpenSSL does to initialize its DRBG, this happens when
# using SoftHSM.
{
   libcrypto_drbg_init
   Memcheck:Value8
   obj:/usr/lib/*/libcrypto.so.*
   fun:AES_encrypt
   obj:/usr/lib/*/libcrypto.so.*
   ...
   obj:/usr/lib/*/libcrypto.so.*
   fun:RAND_DRBG_instantiate
   obj:/usr/lib/*/libcrypto.so.*
   obj:/usr/lib/*/libcrypto.so.*
}