On Tue, Apr 05, 2005, Ladar Levison wrote: > Howdy gents. I wrote an SMTP server using OpenSSL, and it periodically > likes to segmentation fault. The core dumps are below. I can't seem to > get full stack traces, but I think that is related to the number threads > I am using. When I have 128 threads, I get no core dumps. When I have 16 > threads, I get the core dumps shown below. Any advice on how to get > better dumps would be appreciated. (I've already tried setrlimit.) > > The problem only seems be happening once a process has been running for > about 24 hours. The majority of the cores indicate a problem with > SSL_SESSION_list_remove. Googling doesn't yield any answers. > > The version is 0.9.7.f, compiled using ./configure threads -D_REENTRANT; > make install. > > The machine itself is RHEL3, running kernel 2.4.21-27.0.2.ELsmp. I'd be > happy to hear any theories people have. The only two I have are, a) that > its some sort of obscure stack smashing bug. Or b) there is a conflict > with the RHEL version of OpenSSL loaded on the machine. The ldd output > seems to indicate that /lib/libssl.so.4, etc, is linked in, when I know > for a fact I've compiled against the libssl.a in the /usr/local/ssl/lib > directory. This particular build has that linked in statically. (I think > the mysqlclient is linking in the other SSL lib, though it shouldn't > make a difference because I don't use it. > > > #0 0x080d64ee in CRYPTO_add_lock () > (gdb) quit >
Are you compiling OpenSSL with debugging symbols? Hard to tell for sure from that what the cause is. It could well be a problem with the locking callbacks though. A race condition might result in a reference count not being incremented properly: which would cause a crash in that function. Steve. -- Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage OpenSSL project core developer and freelance consultant. Funding needed! Details on homepage. Homepage: http://www.drh-consultancy.demon.co.uk ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
