We are currently experiencing a segfault with version 5.55 openssl version 1.1.0k and are trying to narrow down what the issue may be. The first 2 segfaults are about 10 mins apart. The below is from the stunnel log just before and then after the event. Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77582]: TLS state (accept): SSLv3/TLS write finished Sep 23 11:47:31 xxxx stunnel: LOG7[77582]: TLS state (accept): SSLv3/TLS read change cipher spec Sep 23 11:47:31 xxxx stunnel: LOG7[77582]: TLS state (accept): SSLv3/TLS read finished Sep 23 11:47:31 xxxx stunnel: LOG7[77580]: TLS state (accept): SSLv3/TLS write finished Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Deallocating application specific data for session connect address Sep 23 11:47:31 xxxx stunnel: LOG7[77581]: Remove session callback Sep 23 11:52:58 xxxx stunnel: LOG7[ui]: Clients allowed=62937 Sep 23 11:52:58 xxxx stunnel: LOG5[ui]: stunnel 5.55 on x86_64-pc-linux-gnu platform Sep 23 11:52:58 xxxx stunnel: LOG5[ui]: Compiled/running with OpenSSL 1.1.0k 28 May 2019 Sep 23 11:52:58 xxxx stunnel: LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,OCSP,PSK,SNI Sep 23 11:52:58 xxxx stunnel: LOG7[ui]: errno: (*__errno_location ())

The following is from the kernel log. stunnel[31253]: segfault at 0 ip 00007f91214cacea sp 00007f91205ea9f8 error 6 in libpthread-2.12.so[7f91214c0000+17000]

The kernel log after the second segfault- stunnel[1868]: segfault at 0 ip 00007f5b35398cea sp 00007f5b344c59f8 error 6 in libpthread-2.12.so[7f5b3538e000+17000]

This is all the information we have at the moment. --

Mark Brookes Loadbalancer.org Ltd. www.loadbalancer.org

+44 (0)330 380 1064 [email protected]