Bug 613822 - Missing and wrong hotspot.* probepoint arguments
Summary: Missing and wrong hotspot.* probepoint arguments
Alias: None
Product: Fedora
Classification: Fedora
Component: java-1.6.0-openjdk   
(Show other bugs)
Version: 13
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Mark Wielaard
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 616050 653998
TreeView+ depends on / blocked
Reported: 2010-07-12 21:32 UTC by William Cohen
Modified: 2011-06-29 13:37 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 613824 (view as bug list)
Last Closed: 2011-06-29 13:37:56 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description William Cohen 2010-07-12 21:32:45 UTC
Description of problem:

When attempting to use some of the variable avialable in the hotspot tapset found that some of the arguments were not available.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Install  systemtap java-1.6.0-openjdk  java-1.6.0-openjdk-devel    java-1.6.0-openjdk-debuginfo
2. stap -L 'hotspot.*' > /dev/null
3. See the messages in the "actual results" section
Actual results:

semantic error: not accessible at this address (0x515136): identifier '$arg2' at /usr/share/systemtap/tapset/x86_64/hotspot.stp:438:32
        source:   class = user_string_n($arg1, $arg2);
semantic error: not accessible at this address (0x515136): identifier '$arg6' at :440:30
        source:   sig = user_string_n($arg5, $arg6);
semantic error: failed to retrieve location attribute for local 'arg8' (dieoffset: 0x3c5adc0): identifier '$arg8' at :442:10
        source:   size = $arg8;
semantic error: not accessible at this address (0x5170b7): identifier '$arg2' at :456:32
        source:   class = user_string_n($arg1, $arg2);

Expected results:

All the probe point arguments available in the hotspot tapset should be available. There shouldn't be any "semantic error" messages.

Additional info:

The probe hotspot.object_alloc has:

 size = $arg3;

that should be $arg4 for size according to http://java.sun.com/javase/6/docs/technotes/guides/vm/dtrace.html. However, when this is corrected get:

semantic error: not accessible at this address (0x59d460): identifier '$arg4' at :117:10
        source:   size = $arg4;

Comment 1 Frank Ch. Eigler 2010-07-12 23:26:41 UTC
dbhole can't necessarily fix the 'not accessible at this address' kinds of notes, which are artefacts of gcc debuginfo generation.  Consider copying this bug into a gcc/vta one (and include .i / CFLAGS) for the affected object file.

Comment 2 Mark Wielaard 2010-07-13 09:59:57 UTC
(In reply to comment #0)
> Additional info:
> The probe hotspot.object_alloc has:
>  size = $arg3;
> that should be $arg4 for size

Oops. That is an embarrassing typo in the tapset. Fixed upstream with:

changeset:   2167:bd9b46091cd7
tag:         tip
user:        Mark Wielaard <mark@klomp.org>
date:        Tue Jul 13 11:46:10 2010 +0200
files:       ChangeLog tapset/hotspot.stp.in
Fix hotspot tapset object_alloc size variable.

        Reported by William Cohen <wcohen@redhat.com>
        * tapset/hotspot.stp.in (object_alloc): size is arg4, not arg3.

For the variables not accessible it would indeed be nice to get access to the affected object files. These probes (compiled_method_load, compiled_method_unload) are both in hotspot/src/share/vm/code/nmethod.cpp

Comment 3 Bug Zapper 2011-06-01 14:06:21 UTC
This message is a reminder that Fedora 13 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
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Comment 4 Bug Zapper 2011-06-29 13:37:56 UTC
Fedora 13 changed to end-of-life (EOL) status on 2011-06-25. Fedora 13 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

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