Re: exercising current aarch64 kprobe support with systemtap

[Pratyush Anand <panand@redhat.com>]

On 13/06/2016:12:10:58 PM, William Cohen wrote:
> I dummied up the hw_addr_*.stp tests to not run.  The test made it further, but then got stuck spewing out:
> 
> [ 1648.037580] Unexpected kernel single-step exception at EL1
> [ 1648.043060] Unexpected kernel single-step exception at EL1
> [ 1648.048540] Unexpected kernel single-step exception at EL1
> 
> 
> This happens during the "systemtap.onthefly/kprobes_onthefly.exp" tests  and can be reliably triggered running that portion of the systemtap tests with:
> 
> make installcheck RUNTESTFLAGS="--debug systemtap.onthefly/kprobes_onthefly.exp"
> 
> 
> Seems like the tests get past the following and then start spewing the error message:
> 
> Executing: kill -KILL 22311
> kill: kill: sending signal to 22311 failed: No such process
> PASS: kprobes_onthefly - otf_stress_hard_iter_2000 (survived)
> 
> However the testsuite doesn't seem to make it through to print out the next test:
> 
> PASS: hrtimer_onthefly - otf_stress_max_iter_5000 (survived)
> 
> Note that this kernel (clone of https://github.com/pratyushanand/linux on test_upstream_arm64_devel branch) does have the patch to avoid having the atomic region search go before the start of a function by look for the "stp x29, x30, [sp, -#xx]!"

Hi Will,

No, it should not have that modification yet.

~Pratyush
> 
> -Will