CPU 100% Upstream SSL handshake

[彭谦(研六 福州)]

Hello all!
   Recently I came across a problem that CPU 100% when nginx upstream were trying to SSL handshake to the web sever.
   the pass_proxy url is https://www.salesforce.com/export/login-messages/common/css/images/login/bk_promo_overlay3.png;
   maybe the slow https web site has the same problem.

The debug log:
2013/01/30 11:06:23 [debug] 19604#0: posted event 100232FC
2013/01/30 11:06:23 [debug] 19604#0: *1 delete posted event 100232FC
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL handshake handler: 1
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL_do_handshake: -1
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL_get_error: 2
2013/01/30 11:06:23 [debug] 19604#0: posted event 00000000
2013/01/30 11:06:23 [debug] 19604#0: worker cycle
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:6 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:3 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:7 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:7 wr:1
2013/01/30 11:06:23 [debug] 19604#0: max_fd: 7
2013/01/30 11:06:23 [debug] 19604#0: select timer: 46801
2013/01/30 11:06:23 [debug] 19604#0: select ready 1
2013/01/30 11:06:23 [debug] 19604#0: select write 7
2013/01/30 11:06:23 [debug] 19604#0: *1 post event 100232FC
2013/01/30 11:06:23 [debug] 19604#0: timer delta: 0
2013/01/30 11:06:23 [debug] 19604#0: posted events 100232FC
2013/01/30 11:06:23 [debug] 19604#0: posted event 100232FC
2013/01/30 11:06:23 [debug] 19604#0: *1 delete posted event 100232FC
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL handshake handler: 1
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL_do_handshake: -1
2013/01/30 11:06:23 [debug] 19604#0: *1 SSL_get_error: 2
2013/01/30 11:06:23 [debug] 19604#0: posted event 00000000
2013/01/30 11:06:23 [debug] 19604#0: worker cycle
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:6 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:3 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:7 wr:0
2013/01/30 11:06:23 [debug] 19604#0: select event: fd:7 wr:1
2013/01/30 11:06:23 [debug] 19604#0: max_fd: 7

we can see the write handler will repeat again and again until the SSL_do_handshake return 1.
i just repear the problem in select I/O multiplexing.
Can you help me to fix this bug?

Thanks
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