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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 11:33:39 -0500
- Subject: Re: Segmenation fault for systemtap tests using the arm uprobes support
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- 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> <527A5F1F dot 6060000 at redhat dot com> <527A66EF dot 2050800 at linaro dot org>
On 11/06/2013 10:57 AM, David Long wrote:
> On 11/06/13 10:24, William Cohen wrote:
>>
>> Hi David,
>>
>> With the uprobe-v2 version I only saw one test that appeared to fail because of a sigsegv:
>>
>
> Are you testing on the same hardware? It's conceivable that could make a difference, especially if the number of CPU's is different.
>
Hi David,
I am using the same machine for all the kernels, a samsung ARM chromebook. It is the fastest ARM-based machine I have access to. It does have 2 processor. I am compiling the kernel with SMP support. One thing that is different betweenthe kernels is that the newer uprobes-v2 version was compiled without LPAE or KVM support. Would those configure options make any difference in results?
>>
>> 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?
>>
>
> Yes, they are very useful. I run them all the time. Note there are some expected failures late in the run, also apparently these tests do not test uretprobes.
>
> -dl
Great to hear that the tests are being used to exercise the kprobes. The tests haven't changed in 9 months, so I wasn't sure if they were being used.
-Will