Re: [PATCH] perf test: Test 73 Sig_trap fails on s390

[John Garry]

On 16/12/2021 15:48, Marco Elver wrote:

+

> On Thu, 16 Dec 2021 at 16:15, Thomas Richter<tmricht@xxxxxxxxxxxxx>  wrote:
> > In Linux next kernel
> > Commit 5504f67944484 ("perf test sigtrap: Add basic stress test for sigtrap handling")
> > introduced the new test which uses breakpoint events.
> > These events are not supported on s390 and PowerPC and always fail:
> >
> >   # perf test -F 73
> >   73: Sigtrap                                                         : FAILED!
> >   #
> >
> > Fix it the same way as in the breakpoint tests in file
> > tests/bp_account.c where these type of tests are skipped on
> > s390 and PowerPC platforms.
> >
> > With this patch skip this test on both platforms.
> >
> > Output after:
> >   # ./perf test -F 73
> >   73: Sigtrap
> >
> > Fixes: 5504f67944484 ("perf test sigtrap: Add basic stress test for sigtrap handling")
> >
> > Cc: Marco Elver<elver@xxxxxxxxxx>
> > Signed-off-by: Thomas Richter<tmricht@xxxxxxxxxxxxx>
> Acked-by: Marco Elver<elver@xxxxxxxxxx>
>
> Thanks, and sorry for missing this case!

I am finding that this test hangs on my arm64 machine:

john@debian:~/kernel-dev2/tools/perf$ sudo ./perf test -vvv 73
 73: Sigtrap:
--- start ---
test child forked, pid 45193

And fails on my x86 broadwell machine:

john@localhost:~/kernel-dev2/tools/perf> sudo ./perf test -v 73
73: Sigtrap                                                         :
--- start ---
test child forked, pid 22255
FAILED sys_perf_event_open(): Argument list too long
test child finished with -1
---- end ----
Sigtrap: FAILED!
john@localhost:~/kernel-dev2/tools/perf>

Are there more architectures+platforms for which we need to skip this test?

Thanks,
John