[lttng-dev] lttclt hungs on destroying traces on 2.6.33.2+rt13 (PREEMPT_RT)

[Piotr Romaniuk]

Hi,

I have a problem with getting traces on kernel 2.6.33.2 with PREEMPT_RT 
patch.
I can run ltt-armall and create traces by lttctl but when I destroy 
traces  lttclt hungs.
Is there any fundamental obstacle in RT-kernel for LTT?

I use following versions:
1) kernel 2.6.33.2
2) patch-2.6.33.2-rt13 from 
http://www.kernel.org/pub/linux/kernel/projects/rt/2.6.33/older/
3) LTTng: patch-2.6.33.2-lttng-0.212
4) LTT control: 0.89-05122011

I tuned slightly LTTng patches in order to apply them on rt kernel.
The changes were rather easy and were limited to adaptation of 
surrounding context
that had been changed by RT-patch.
I built the kernel (all LTT modules I built in the kernel) successfully.

The problem appears when I try to destroy traces. Lttctl hungs and no 
data are copied to files.

Do you have any suggestions?

Regards,
Piotr Romaniuk