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<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>Hello all!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'> Recently I came across a problem that CPU
100% when nginx upstream were trying to SSL handshake to the web sever.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'> the pass_proxy url is
https://www.salesforce.com/export/login-messages/common/css/images/login/bk_promo_overlay3.png;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'> maybe the slow https web site has the
same problem.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>The
debug log:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: posted event 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 delete posted event 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL handshake handler: 1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL_do_handshake: -1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL_get_error: 2<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: posted event 00000000<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: worker cycle<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:6 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:3 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:7 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:7 wr:1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: max_fd: 7<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select timer: 46801<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select ready 1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select write 7<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 post event 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: timer delta: 0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: posted events 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: posted event 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 delete posted event 100232FC<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL handshake handler: 1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=DA style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL_do_handshake: -1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: *1 SSL_get_error: 2<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: posted event 00000000<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: worker cycle<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:6 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:3 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:7 wr:0<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: select event: fd:7 wr:1<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>2013/01/30
11:06:23 [debug] 19604#0: max_fd: 7<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>we
can see the write handler will repeat again and again until the
SSL_do_handshake return 1.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>i
just repear the problem in select I/O multiplexing.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>Can
you help me to fix this bug?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd'><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>Thanks<o:p></o:p></span></font></p>
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