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Re: exercising current aarch64 kprobe support with systemtap


On 06/23/2016 11:49 AM, William Cohen wrote:
On 06/22/2016 11:18 PM, David Long wrote:
On 06/22/2016 04:24 PM, William Cohen wrote:
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



I'll take a look and see what I can figure out.

In the meantime I did just push a v14 branch.  I'm doubtful that it will address the above problem even though it contains a few bug fixes.

-dl


Hi Dave and Pratyush,

I tried the kprobes64-v13 kernel and it also seems to work, so it lookw like the problem might be in the the
test_upstream_arm64_devel branch of https://github.com/pratyushanand/linux .

-Will


I'm going to interpret that as meaning you know of no problem in the kprobes v14 patch that would give me pause to email it upstream. Do you disagree?

-dl


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