Kernel freeze during ftrace startup test (x86)

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Hello,

I'm trying to build a kernel-image based on 2.6.32.20 with RTAI-patch
(3.8.1) and enabled tracing.

During the first tests I noticed that when I try to enable the
function trace via debugfs the machine reboots.
Then I enabled FTRACE_STARTUP_TEST and now the kernel freezes during
the boot process while doing the function trace test and it seems to
be completely unresponsive (sysrq-key not working...).

I can also observe this behavior with a vanilla 2.6.32.20 kernel
running in a VMWARE-Machine.

Is this caused by some wrong configuration settings on my side or is
there a bug involved?

How can I collect more information about the problem?

Regards
Felix Jirka
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