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Re: exercising current aarch64 kprobe support with systemtap
- From: William Cohen <wcohen at redhat dot com>
- To: systemtap at sourceware dot org, Dave Long <dave dot long at linaro dot org>, Pratyush Anand <panand at redhat dot com>, Mark Brown <broonie at linaro dot org>
- Cc: Jeremy Linton <jlinton at redhat dot com>, David Smith <dsmith at redhat dot com>
- Date: Wed, 22 Jun 2016 16:24:46 -0400
- Subject: Re: exercising current aarch64 kprobe support with systemtap
- Authentication-results: sourceware.org; auth=none
- References: <befacf57-b8eb-2926-8f4f-742f0f055a4c at redhat dot com> <d03cd7b7-3d6a-4e4d-71b6-a7325ddd76f3 at redhat dot com>
Hi all,
When running the current systemtap checked out from the git repository
and a locally built kernel with the kprobes64-v13 patches (the
test_upstream_arm64_devel branch of
https://github.com/pratyushanand/linux) on Fedora 23 machine one of
the kprobes_onthefly.exp tests is causing the machine to get in a
state that requires rebooting to fix. This can be triggered by running a
portion of the systemtap tests with:
make installcheck RUNTESTFLAGS="--debug systemtap.onthefly/kprobes_onthefly.exp"
When it gets to the kprobes_onthefly - otf_stress_max_iter_5000 test the
console starts spewing the following and needs to be rebooted:
[23394.036860] Unexpected kernel single-step exception at EL1
[23394.042434] Unexpected kernel single-step exception at EL1
[23394.048008] Unexpected kernel single-step exception at EL1
[23394.053541] Unexpected kernel single-step exception at EL1
[23394.059053] Unexpected kernel single-step exception at EL1
[23394.064545] Unexpected kernel single-step exception at EL1
Sorry I don't have the start of the failure it scrolled off the screen very quickly.
-Will