* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
@ 2011-06-28 21:04 ` wcohen at redhat dot com
2011-06-28 21:05 ` wcohen at redhat dot com
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From: wcohen at redhat dot com @ 2011-06-28 21:04 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
--- Comment #1 from William Cohen <wcohen at redhat dot com> 2011-06-28 21:04:00 UTC ---
Created attachment 5826
--> http://sourceware.org/bugzilla/attachment.cgi?id=5826
Script to find address of element to watch
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* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
2011-06-28 21:04 ` [Bug runtime/12947] " wcohen at redhat dot com
@ 2011-06-28 21:05 ` wcohen at redhat dot com
2011-06-29 15:57 ` wcohen at redhat dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: wcohen at redhat dot com @ 2011-06-28 21:05 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
--- Comment #2 from William Cohen <wcohen at redhat dot com> 2011-06-28 21:04:44 UTC ---
Created attachment 5827
--> http://sourceware.org/bugzilla/attachment.cgi?id=5827
Script to watch changes to the amount of free memory
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* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
2011-06-28 21:04 ` [Bug runtime/12947] " wcohen at redhat dot com
2011-06-28 21:05 ` wcohen at redhat dot com
@ 2011-06-29 15:57 ` wcohen at redhat dot com
2011-07-05 15:46 ` wcohen at redhat dot com
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From: wcohen at redhat dot com @ 2011-06-29 15:57 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
--- Comment #3 from William Cohen <wcohen at redhat dot com> 2011-06-29 15:56:54 UTC ---
Created attachment 5830
--> http://sourceware.org/bugzilla/attachment.cgi?id=5830
Ensure that the rc code is set when attempting to register a hw_breakpoint
The setup code for the hw_breakpoint doesn't check the return code. The problem
occurs later when there is an attempt to unregister the invalid hw_breakpoint.
This makes sure that rc gets propogated to minize the possibility of later
problems.
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* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
` (2 preceding siblings ...)
2011-06-29 15:57 ` wcohen at redhat dot com
@ 2011-07-05 15:46 ` wcohen at redhat dot com
2011-07-05 16:01 ` wcohen at redhat dot com
2011-07-27 18:23 ` wcohen at redhat dot com
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From: wcohen at redhat dot com @ 2011-07-05 15:46 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
--- Comment #4 from William Cohen <wcohen at redhat dot com> 2011-07-05 15:46:31 UTC ---
The 2011-06-29 15:56 UTC patch allows systemtap to exit more gracefully when
unable to register the hw_breakpoint probe. Need to be root when using the
hw_breakpoint.
However, there still issues when systemtap attempts to use the hw_breakpoints.
Will attach log of back trace in a moment.
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* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
` (3 preceding siblings ...)
2011-07-05 15:46 ` wcohen at redhat dot com
@ 2011-07-05 16:01 ` wcohen at redhat dot com
2011-07-27 18:23 ` wcohen at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: wcohen at redhat dot com @ 2011-07-05 16:01 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
--- Comment #5 from William Cohen <wcohen at redhat dot com> 2011-07-05 16:00:26 UTC ---
Created attachment 5834
--> http://sourceware.org/bugzilla/attachment.cgi?id=5834
oops when using hw_breakpoint
The output was generated with
/home/wcohen/systemtap_write/install/bin/stap -v hwkbrpt_sample.stp pid_max
Pass 1: parsed user script and 76 library script(s) using
25000virt/13840res/2568shr kb, in 410usr/30sys/927real ms.
Pass 2: analyzed script: 1 probe(s), 1 function(s), 2 embed(s), 0 global(s)
using 25276virt/14428res/2836shr kb, in 20usr/0sys/85real ms.
Pass 3: using cached
/root/.systemtap/cache/4a/stap_4a5b6a0564c3a5f41b9730f6cd92e255_1130.c
Pass 4: using cached
/root/.systemtap/cache/4a/stap_4a5b6a0564c3a5f41b9730f6cd92e255_1130.ko
Pass 5: starting run.
WARNING: Hwbkpt probe kernel.data("pid_max").length(1).rw: registration error
-902930368, addr (null), name pid_max
ERROR: probe kernel.data("pid_max").length(1).rw registration error (rc
-902930368)
Pass 5: run completed in 10usr/60sys/516real ms.
Pass 5: run failed. Try again with another '--vp 00001' option.
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* [Bug runtime/12947] Use of hardware watchpoint causing oops
2011-06-28 21:03 [Bug runtime/12947] New: Use of hardware watchpoint causing oops wcohen at redhat dot com
` (4 preceding siblings ...)
2011-07-05 16:01 ` wcohen at redhat dot com
@ 2011-07-27 18:23 ` wcohen at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: wcohen at redhat dot com @ 2011-07-27 18:23 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12947
William Cohen <wcohen at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #6 from William Cohen <wcohen at redhat dot com> 2011-07-27 18:22:47 UTC ---
Fixed in:
43650b10c3f42dedb0d83ce7ecff4957be49ef90
217ef1f405ba7d425c8f5ab3ca730bfa4a395c75
Tests checked in:
feb9187ba645c198e2e177080b4563080c0ee69e
73017154bbe6f1d6da5ff23c5c6c03324799c40d
Note that the tests need to run as root to function
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