Re: tcp_test.stp failed to run in my IA64 box

[David Smith <dsmith at redhat dot com>]

On Thu, 2006-07-20 at 19:45 +0800, bibo,mao wrote:
> hi, 
>    tcp_test.stp failed to run in my IA64 box, it can not resolve $return variant.
> I simplified the test case like this
> probe kernel.function("tcp_sendmsg").return {
>         size = $return
>         if (size > 0) {
>                 send_bytes += size
>         }
> }
> 
> The following the error compiling message.
> 
> Pass 1: parsed user script and 39 library script(s) in 463usr/4sys/468real ms.
> parsed 'tcp_sendmsg' -> func 'tcp_sendmsg'
> pattern 'kernel' matches module 'kernel'
> focused on module 'kernel' = [a000000100000000-a0000001018f6f28, bias 0]
> pattern 'tcp_sendmsg' matches function 'tcp_sendmsg'
> selected function tcp_sendmsg
> prologue searching function 'tcp_sendmsg' 0xa0000001004d51a0-0xa0000001004d7b60@net/ipv4/tcp.c:788
> checking line record 0xa0000001004d51a0@net/ipv4/tcp.c:788
> checking line record 0xa0000001004d51a1@net/ipv4/tcp.c:788
> checking line record 0xa0000001004d51a2@net/ipv4/tcp.c:788
> checking line record 0xa0000001004d51b0@net/ipv4/tcp.c:788
> checking line record 0xa0000001004d51b1@net/ipv4/tcp.c:797
> prologue found function 'tcp_sendmsg' = 0xa0000001004d51b1
> literal_stmt_for_return: finding return value for tcp_sendmsg(net/ipv4/tcp.c)
> literal_stmt_for_return: finding return value for tcp_sendmsg(net/ipv4/tcp.c)
> probe tcp_sendmsg@net/ipv4/tcp.c:788 pc=0xa0000001004d51a0
> pattern 'kernel' matches module 'kernel'
> keeping expression operator '=' at 1.stp:2:7 because it writes: size and/or embedded: 0
> keeping expression operator '+=' at 1.stp:4:14 because it writes: send_bytes and/or embedded: 0
> semantic error: unresolved target-symbol expression: identifier '$return' at 1.stp:2:9
> semantic error: unresolved target-symbol expression: identifier '$return' at 1.stp:2:9
> semantic error: unresolved target-symbol expression: identifier '$return' at 1.stp:2:9
> semantic error: unresolved target-symbol expression: identifier '$return' at 1.stp:2:9
> Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 global(s) in 254usr/22sys/278real ms.
> Pass 2: analysis failed.  Try again with more '-v' (verbose) options.
> Running rm -rf /tmp/stapupBbik
> :

This works fine for me on my x86 box.  Questions:

- What kernel was the system running?

- What version of elfutils was the system running?  If it wasn't running
the latest version (0.122), can you upgrade and try again?

-- 
David Smith
dsmith@redhat.com
Red Hat, Inc.
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)