root@snmp:~# stap web.stp  -v
Pass 1: parsed user script and 111 library script(s) using 109800virt/43780res/6180shr/37852data kb, in 110usr/20sys/125real ms.
semantic error: while resolving probe point: identifier 'process' at web.stp:23:7
        source: probe process(@httpd).mark("internal__redirect")  {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :28:7
        source: probe process(@httpd).mark("read__request__entry") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :32:7
        source: probe process(@httpd).mark("read__request__success") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :39:7
        source: probe process(@httpd).mark("process__request__entry") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :43:7
        source: probe process(@httpd).mark("process__request__return") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :48:7
        source: probe process(@libphp5).mark("request__startup"),
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :49:7
        source:       process(@libphp5).mark("request__shutdown") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :54:7
        source: probe process(@libphp5).mark("function__entry"),
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :55:7
        source:       process(@libphp5).mark("function__return") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :61:7
        source: probe process(@mysqld).mark("query__parse__start") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :65:7
        source: probe process(@mysqld).mark("query__parse__done") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :69:7
        source: probe process(@mysqld).mark("query__exec__start") {
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'process' at :73:7
        source: probe process(@mysqld).mark("query__exec__done") {
                      ^

semantic error: no match

Pass 2: analyzed script: 0 probe(s), 10 function(s), 0 embed(s), 2 global(s) using 110592virt/45976res/7332shr/38644data kb, in 0usr/0sys/5real ms.
Pass 2: analysis failed.  [man error::pass2]
Tip: /usr/share/doc/systemtap/README.Debian should help you get started.