Hello, We're using OpenSSl 1.1.1b on WIN64 and are facing a (rare but strange) core-dump when doing the following:
After successful TLS1.3 handshake we're calling SSL_read() to get the first 2 Bytes of PDU data from the new connection (ASN.1 TAG + length). SSL_read() returns 0 According to OpenSSL 1.1.1 documentation: For SSL_read() and SSL_peek() the following return values can occur: <= 0 The read operation was not successful, because either the connection was closed, an error occurred or action must be taken by the calling process. Call SSL_get_error(3)<https://www.openssl.org/docs/man1.1.1/man3/SSL_get_error.html> with the return value ret to find out the reason. We follow and call SSL_get_error() which crashes with debugger output (only topmost frame is shown here) LIBSSL!SSL_get_error(struct ssl_st * s = 0x00000000`05be9a00, int i = <Value unavailable error>)+0x18c [d:\data\openssl\64\openssl-1.1.1b\ssl\ssl_lib.c @ 3560] The OpenSSL source at this reported line looks like: if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) && (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY)) return SSL_ERROR_ZERO_RETURN; when we inspect the session "s" in the debugger, we find that s->shutdown == 3 and s->s3 == NULL which finally causes the crash It looks like a bug in OpenSSL....??? So far it happened only once in our LAB (after some hours of heavy SSL load testing with thousands of SSL connections created/deleted....) we're currently not able to reproduce it..... Any comments/ideas/fixes would be appreciated...... Gerhard Jahn Senior Developer IAM - AITs GER BDS CySP DIRX PDM T +49 (0) 211 399 33276 T +49 (0) 211 399 22891 gerhard.j...@atos.net<mailto:gerhard.j...@atos.net> Atos Information Technology GmbH Otto-Hahn-Ring 6 81739 Munich, Germany atos.net<http://de.atos.net/>/de << OLE Object: Picture (Device Independent Bitmap) >> Atos Information Technology GmbH Managing Directors: Ursula Morgenstern, Udo Littke; Chairman of the Supervisory Board: Eric Grall; Registered office: Munich; Commercial register of the local court of Munich, HRB 235509