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    SubjectRe: [PATCHv3] tracing - avoid soft lockup in trace_pipe
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    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




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