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    SubjectRe: 2.6.33: ftrace triggers soft lockup
    Steven Rostedt wrote:
    > On Fri, 2010-03-12 at 21:07 -0500, Steven Rostedt wrote:
    >> On Tue, 2010-03-09 at 11:38 +0800, Li Zefan wrote:
    >>
    >>> The segfault is from userspace. This is a segfault I just got:
    >>>
    >>> ftrace_stack_ma[14989]: segfault at fe2e ip 00000000004474c0 sp 00007fffb97e38c0 error 4 in bash[400000+d1000]
    >> Li and Lai,
    >>
    >> Thanks a lot for reporting all this, and writing the ftrace_stress_test.
    >> I've fixed all the bugs that it has reported (to my knowledge) and after
    >> a little more testing I will soon be sending a patch series out.
    >
    > Li,
    >
    > I ran your test for 13 hours on three different machines. I did not hit
    > any more errors. Although I see a lockdep warning (not a locking problem
    > but the WARN_ON in fork.c is triggering). I'll look into that on Monday.
    >

    As I said in the offline mail, this warning is caused by global trace_clock,
    and I sent a fix sometime ago:

    http://lkml.org/lkml/2009/12/21/4

    > Please take the new patches that Ingo just pushed to Linus, if you find
    > any more bugs, please let me know right away.
    >

    Thanks for the fixes!



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