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Re: Segmenation fault for systemtap tests using the arm uprobes support
- From: William Cohen <wcohen at redhat dot com>
- To: David Long <dave dot long at linaro dot org>
- Cc: Naresh Kamboju <naresh dot kamboju at linaro dot org>, "systemtap at sourceware dot org" <systemtap at sourceware dot org>
- Date: Wed, 06 Nov 2013 10:24:15 -0500
- Subject: Re: Segmenation fault for systemtap tests using the arm uprobes support
- Authentication-results: sourceware.org; auth=none
- References: <5229DF78 dot 4060301 at redhat dot com> <5229E091 dot 1090802 at linaro dot org> <52681E03 dot 8080509 at redhat dot com> <52701F7A dot 8070102 at linaro dot org> <527956C8 dot 9050401 at redhat dot com> <527986F9 dot 7030204 at linaro dot org>
On 11/05/2013 07:02 PM, David Long wrote:
> On 11/05/13 15:36, William Cohen wrote:
>> On 10/29/2013 04:50 PM, David Long wrote:
>>> OK, I've seen your error once now. I guess I just need to run the test a number of times looking for it. I am investigating.
>>>
>>> -dl
>>>
>>
>> Hi David,
>>
>> I finally got the uprobe-v2 branch of https://git.linaro.org/gitweb?p=people/davelong/linux.git;a=summary working on my samsung arm chromebook (needed to use a newer exynos5250-snow.dtb file). I reran the at_var test with the newer kernel and do not see the sigsegv.
>>
>> I am going to rerun the test tests with this kernel and see if the problem went away with the newer version of the patches.
>>
>> -Will
>>
>
>
> I'm still seeing the SEGV with my latest patches on V3.12 on a Panda.
>
> -dl
>
Hi David,
With the uprobe-v2 version I only saw one test that appeared to fail because of a sigsegv:
FAIL: 32_BIT_UTRACE_SYSCALL_ARGS
I have uploaded the test results of the systemtap run with the uprobes-v2 branch to the systemtap dejazilla system:
web.elastic.org/~dejazilla/viewsummary.php?summary=%3D%27%3C527A58AC.9000301%40redhat.com%3E%27
dejazilla allows comparison between different systemtap.sum files. I looked through the list of recent arm7l runs:
https://web.elastic.org/~dejazilla/viewsummary.php?_offset=0&_limit=20&_sort=1A&summary=&age=&rg=&tool=&variant=%3D%27armv7l-unknown-linux-gnueabihf%27&versions=&pass=&fail=&kpass=&kfail=&xpass=&xfail=&untested=&unresolved=&unsupported=&warning=&error=
The following URL is a comparison between the older uprobes and uprobes-v2 runs:
https://web.elastic.org/~dejazilla/viewrgdiff.php?rg1=150513&rg2=822815&_sort=0A&_limit=1000
Some of the like minidebuginfo and process_by_cmd2.stp passed with the uprobes-v2 kernel.
When searching for ways to test uprobes support I cam across https://github.com/rabinv/uprobes-test . Are these tests useful or have they been orphaned?
-Will