Fixing cpu hog with all upstream servers marked "down". The following configuration causes nginx to hog cpu due to infinite loop in ngx_http_upstream_get_peer(): upstream backend { server 127.0.0.1:8080 down; server 127.0.0.1:8080 down; } server { ... location / { proxy_pass http://backend; } } Make sure we don't loop infinitely in ngx_http_upstream_get_peer() but stop after resetting peer weights once. Return 0 if we are stuck. This is guaranteed to work as peer 0 always exists, and eventually ngx_http_upstream_get_round_robin_peer() will do the right thing falling back to backup servers or returning NGX_BUSY.

X:stylesheet {

X:template = "directive" {
    <a name="{@name}" /> <center><h4> !{@name} </h4></center>
    !! "syntax";
    !! "default";
    !! "context";
    !! "para";
}

X:template = "syntax" { X:text {syntax: } !!; <br/> }
X:template = "default" { X:text {default: } !!; <br/> }
X:template = "context" { X:text {context: } !!; <br/> }

}