Philippe, you recently said there is a bug in the x86_64 support when syscall tracing is enabled. Now I think I stepped on it as well: In order to validate my APIC frequency patches for that arch, I wanted to use LTTng there. But as soon as I start the trace, the latency test fails to run, prematurely exiting due to a segfault. Gdb and the kernel say that user land jumped to address 0, I just yet failed to find out where they come from. I strongly assume LTTng enables syscall tracing, because its entry/exit instrumentations are inside the hook function (syscall_trace_entry/leave).
Do you have any further details on your tracing issue? Does may observation correlates with yours? Jan
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