On Thu, 8 Jun 2017 15:14:19 -0600 Shuah Khan <[email protected]> wrote:
> On 06/08/2017 03:08 PM, Steven Rostedt wrote: > > On Thu, 8 Jun 2017 14:06:23 -0600 > > Shuah Khan <[email protected]> wrote: > > > >>>>>>> # of passed: 41 > >>>>>>> # of failed: 1 > >>>>>>> # of unresolved: 0 > >>>>>>> # of untested: 0 > >>>>>>> # of unsupported: 3 > >>>>>>> # of xfailed: 0 > >>>>>>> # of undefined(test bug): 0 > >>> > >>> I booted v4.12-rc4 with your config (didn't even have to change > >>> anything for my box), and checkout the v4.12-rc4 kernel on the test box > >>> and ran ftracetest. Here's my result: > >>> > >>> # of passed: 40 > >>> # of failed: 0 > >>> # of unresolved: 0 > >>> # of untested: 0 > >>> # of unsupported: 6 > >>> # of xfailed: 0 > >>> # of undefined(test bug): 0 > >>> > >>> The unsupported were: > >>> > >>> [29] event trigger - test histogram modifiers [UNSUPPORTED] > >>> [30] event trigger - test histogram trigger [UNSUPPORTED] > >>> [31] event trigger - test multiple histogram triggers [UNSUPPORTED] > >>> > >>> [44] (instance) event trigger - test histogram modifiers [UNSUPPORTED] > >>> [45] (instance) event trigger - test histogram trigger [UNSUPPORTED] > >>> [46] (instance) event trigger - test multiple histogram triggers > >>> [UNSUPPORTED] > >>> > >>> Now why is this different? What compiler are you using to build your > >>> kernel? > >>> > >> gcc version 6.3.0 20170406 (Ubuntu 6.3.0-12ubuntu2) > >> > >> > >> I don't see any regressions. I use this system for stable release testing > >> and haven't seen any issues. Does ftrace have a dependency on a specific > >> gcc revision? > > > > It behaves differently with different gcc, as some support mfentry, > > while others only use mcount. gcc 6.3.0 should be using mfentry. I'm > > testing with 6.2, a build I made myself. > > > > Just to confirm, you are running the 4.12-rc4 ftracetests on a 4.12-rc4 > > kernel and getting this error? Or are you running a different version > > of ftracetest or a different version of the kernel? > > > > I am running 4.12-rc4 ftracetests on a 4.12-rc4 kernel. I did a headers > install before I built and ran kselftest. Well, ftracetest is mainly bash scripts. So it shouldn't be affected by any C libraries or headers. > > btw tests should run on older kernels failing gracefully when feature isn't > supported and/or enabled. Correct, it should do that. > > So the expectation is for ftracetest to run cleanly skipping tests on older > kernels. Note, when a bug is found, we do add the reproducer to ftracetest. So depending on whether you have the latest stable, or the stable has a fix, ftracetest can cause the machine to crash on older releases. > > Would getting results for ftracetest on 4.11 with 4.11 ftracetest help you > with debug? > No, I'm trying to see why I get a completely different result from what you have running the same version of the kernel, config and tests. -- Steve
