[ltt-dev] lttctl locks up with RT Linux

[jpaul@gdrs.com (jpaul@gdrs.com)]

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:compudj@krystal.dyndns.org]
Sent: Tue 5/11/2010 11:11 AM
To: John P. Paul
Cc: ltt-dev at lists.casi.polymtl.ca; Paul E. McKenney; linux-rt-users at vger.kernel.org
Subject: Re: [ltt-dev] lttctl locks up with RT Linux
 
* jpaul at gdrs.com (jpaul at gdrs.com) 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

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