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Date: Fri, 25 Mar 2011 11:49:37 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Jiri Olsa <jolsa@...hat.com> Cc: Oleg Nesterov <oleg@...hat.com>, fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCHv3] tracing - avoid soft lockup in trace_pipe On Fri, 2011-03-25 at 12:05 +0100, Jiri Olsa wrote: > right, I'm now able to trigger the issue when running setting the tracing > as said in the patch and plus running this in few instacies: > > (while [ 1 ]; do find / > /dev/null ; done) & That didn't work for me either. But if I run hackbench 50 on the box, then the trace does hang while it is running. > > It's strange I did not need this last time.. not sure why :) > > > anyway, the original reproducer I picked this issue from is ltp suite: > http://sourceforge.net/projects/ltp/files/LTP%20Source/ltp-20100131/ltp-full-20100131.tgz/download > > and running following test: > ltp-full-20101031/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress_test.sh > > reproduces the issue all the time for me, and the patch fixies it. > Attaching patch rebased to the current master with changed comment. Thanks, I'll queue it up for 2.6.40, as I do not think this is that critical of a bug. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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