mutex lock and session cache problem

Hello,

I have a problem with mod_ssl running apache 2.0.36 on Linux Debian.
The ssl server hangs after couple of HTTPS requests and i have to restart
it.

In log file I get these two warnings when the connection hangs:

[warn] Failed to acquire global mutex lock
[warn] Failed to release global mutex lock

I found out that if I change the settings in ssl.conf from
SSLSessionCache dbm:logs/ssl_scache
SSLSessionCacheTimeout 30

to
SSLSessionCache none

then everything works OK.


Can anyone help me with this problem?

Thank you,
Rok





Log file when connection works OK

[info] Connection to child 4 established (server, client)
[info] Seeding PRNG with 136 bytes of entropy
[trace] OpenSSL: Handshake: start
[trace] OpenSSL: Loop: before/accept initialization
[trace] OpenSSL: Loop: SSLv3 read client hello A
[trace] OpenSSL: Loop: SSLv3 write server hello A
[trace] OpenSSL: Loop: SSLv3 write certificate A
[trace] OpenSSL: Loop: SSLv3 write server done A
[trace] OpenSSL: Loop: SSLv3 flush data
[trace] OpenSSL: Loop: SSLv3 read client key exchange A
[trace] OpenSSL: Loop: SSLv3 read finished A
[trace] OpenSSL: Loop: SSLv3 write change cipher spec A
[trace] OpenSSL: Loop: SSLv3 write finished A
[trace] OpenSSL: Loop: SSLv3 flush data
[trace] OpenSSL: Handshake: done
[info] Connection: Client IP: 194.249.3.75, Protocol: SSLv3, Cipher:
RC4-MD5 (128/128 bits)
[info] Initial (No.1) HTTPS request received for child 4 (server)
[info] Connection to child 4 closed with unclean shutdown(server, client)


Log file when connection hangs:


[info] Connection to child 4 established (server, client)
[info] Seeding PRNG with 136 bytes of entropy
[trace] OpenSSL: Handshake: start
[trace] OpenSSL: Loop: before/accept initialization
*****[warn] Failed to acquire global mutex lock
*****[warn] Failed to release global mutex lock
[trace] Inter-Process Session Cache (DBM) Expiry: old: 1, new: 0, removed: 1
[trace] Inter-Process Session Cache: request=GET status=MISSED
id=CBDD0F6495EE486FCAED56F8E6B1E8A19E1C27CF1F74C008CFB79D844 1CCC532 (session
renewal)
[trace] OpenSSL: Loop: SSLv3 read client hello A
[trace] OpenSSL: Loop: SSLv3 write server hello A
[trace] OpenSSL: Loop: SSLv3 write certificate A
[trace] OpenSSL: Loop: SSLv3 write server done A
[trace] OpenSSL: Loop: SSLv3 flush data
[trace] OpenSSL: Loop: SSLv3 read client key exchange A
[trace] OpenSSL: Loop: SSLv3 read finished A
[trace] OpenSSL: Loop: SSLv3 write change cipher spec A
[trace] OpenSSL: Loop: SSLv3 write finished A
[trace] OpenSSL: Loop: SSLv3 flush data

And here it stops and I have to restart it.




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