Please double-check that you applied the last patch correctly. I tried building a lttng-enabled -rt tree here (x86 64 box), and it works (I can start/stop tracing and see the trace in lttv).
Note that I simply discarded the conflicting instrumentation patches for this quick test. I'm pretty sure an error could have been inserted in async_wakeup() within ltt-tracer.c. Can you paste the code you have ? Unbalanced rcu read lock/unlock could be causing this. Thanks, Mathieu * [email protected] ([email protected]) wrote: > Turning off CONFIG_RCU_CPU_STALL_DETECTOR does not solve the issue with > starting up "lttctl -C" ... that call never returns. I'm no longer getting > the stack dumps in /var/log/messages and I still have to hard reboot the > system as soft reboot doesn't work. > > JP > > > -----Original Message----- > From: Mathieu Desnoyers [mailto:[email protected]] > Sent: Tue 5/11/2010 11:11 AM > To: John P. Paul > Cc: [email protected]; Paul E. McKenney; > [email protected] > Subject: Re: [ltt-dev] lttctl locks up with RT Linux > > * [email protected] ([email protected]) wrote: > > Thanks Mathieu. I'm going to have to look at this a bit more. This may > > have fixed one problem and cause another as "lttctl -C -w /tmp/trace > > trace1" does not return and I'm getting a stack dump in the messages > > file (see below). The last msg I see from that "lttctl -C" command is > > "lttctl: Creating trace". The "lttctl: Forking lttd" is not displayed. > > If you disable RCU stalls detection, does it work ? > > [Context for Paul: it's on a -RT kernel, with the LTTng patchset] > > Thanks, > > Mathieu > > -- > This is an e-mail from General Dynamics Robotic Systems. It is for the > intended recipient only and may contain confidential and privileged > information. No one else may read, print, store, copy, forward or act in > reliance on it or its attachments. If you are not the intended recipient, > please return this message to the sender and delete the message and any > attachments from your computer. Your cooperation is appreciated. > -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
