[ag-automation] echo 1 > /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff causes crash

["Dr.-Ing. Matthias Schöpfer"]

Hi!

I am having a strange latency issue with my application. But I do not
want to bore you with details. Funny is, I think, that:

echo 1 > /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff

will immediately crash the machine. I have seen this with 3.12.26-rt40
and 3.12.31-rt45 and, I think, with 3.14.12-rt9 (I can double check, if
anyone is interested).

Unfortunately I do not even get a trace/dump.

And: my application/driver is not loaded at that time.

My question: Is this a known bug or are there known causes, and if not,
is it worth investigating?!

I have another machine where it works just fine, although different
.config. Both are x86-Hardware, the one that crashes is x86_64.

Thanks and Regards!


-- 
Dr. Matthias Schöpfer
mz robolab GmbH
Marie-Curie-Str. 1
53359 Rheinbach

Office: +49 2226 83600 00
Fax: +49 2226 83600 11
Email: schoepfer at robolab.de

mz robolab GmbH
Vertretungsberechtigte Geschäftsführer: Dr. Rüdiger Maaß, Ralf Schulte
Registergericht Amtsgericht Bonn
Registernummer HRB 10595
---
This e-mail may contain confidential and/or privileged information. If
you are not the intended recipient (or have received this e-mail in
error) please notify the sender immediately and destroy this e-mail. Any
unauthorised copying, disclosure or distribution of the material in this
e-mail is strictly forbidden.

Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte
Informationen. Wenn Sie nicht der richtige Adressat sind oder diese
E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den
Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie
die unbefugte Weitergabe dieser Mail ist nicht gestattet.
---
P    please consider the environment before printing this e-mail