Problem using bulk mode (relayfs)

Problem using bulk mode (relayfs)

[Perry Cheng]

I am having trouble running stap in bulk mode on a script that otherwise 
works fine.  That is, I normally run with just "-g" but with "-g -b" it no 
longer works.  Here's the output with one -v.   Is this a known problem? 

OS version: 2.6.16 modified with various real-time patches
stap version:   (version 0.5.13 built 2007-02-12)    (Using Red Hat 
elfutils 0.125 libraries.)

Pass 1: parsed user script and 54 library script(s) in 260usr/0sys/269real 
ms.
Pass 2: analyzed script: 6 probe(s), 14 function(s), 3 embed(s), 0 
global(s) in 300usr/60sys/356real ms.
Pass 3: using cached 
/gsa/watgsa/home/p/e/perryche/.systemtap/cache/4a/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.c
Pass 4: using cached 
/gsa/watgsa/home/p/e/perryche/.systemtap/cache/4a/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko
Pass 5: starting run.
insmod: error inserting 
'/tmp/stapUcDLAt/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko': -1 
Unknown symbol in module
ERROR, couldn't insmod probe module 
/tmp/stapUcDLAt/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko
Pass 5: run completed in 0usr/10sys/30real ms.
Pass 5: run failed.  Try again with more '-v' (verbose) options.

Increasing the level of verbosity generates no error/warnings in Passes 
1-4 and no additional output in the failing Pass 5.


Perry

Re: Problem using bulk mode (relayfs)

[David Smith]

Perry Cheng wrote:
> I am having trouble running stap in bulk mode on a script that otherwise 
> works fine.  That is, I normally run with just "-g" but with "-g -b" it no 
> longer works.  Here's the output with one -v.   Is this a known problem? 
> 
> OS version: 2.6.16 modified with various real-time patches
> stap version:   (version 0.5.13 built 2007-02-12)    (Using Red Hat 
> elfutils 0.125 libraries.)
> 
> Pass 1: parsed user script and 54 library script(s) in 260usr/0sys/269real 
> ms.
> Pass 2: analyzed script: 6 probe(s), 14 function(s), 3 embed(s), 0 
> global(s) in 300usr/60sys/356real ms.
> Pass 3: using cached 
> /gsa/watgsa/home/p/e/perryche/.systemtap/cache/4a/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.c
> Pass 4: using cached 
> /gsa/watgsa/home/p/e/perryche/.systemtap/cache/4a/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko
> Pass 5: starting run.
> insmod: error inserting 
> '/tmp/stapUcDLAt/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko': -1 
> Unknown symbol in module
> ERROR, couldn't insmod probe module 
> /tmp/stapUcDLAt/stap_4aca05003686bb4d8c3530e87c8a2d4d_11456.ko
> Pass 5: run completed in 0usr/10sys/30real ms.
> Pass 5: run failed.  Try again with more '-v' (verbose) options.
> 
> Increasing the level of verbosity generates no error/warnings in Passes 
> 1-4 and no additional output in the failing Pass 5.

I haven't seen this before, but you might try looking at the output of 
dmesg or looking in /var/log/messages (depending on how your system is 
configured) for a better error message from the equivalent of insmod. 
Hopefully you'll get the name of the unknown symbol.  If that doesn't 
work, try running insmod yourself on the cached module and see what you get.

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