Re: SIGSEGV when using "perf record -g" with 3.13-rc* kernel

[Peter Zijlstra]

On Fri, Jan 10, 2014 at 11:56:07AM -0800, Andy Lutomirski wrote:
>  - The perf callchain code tries to read from a bad userspace pointer
> (not sure why -- the ip value in the vsyscall page *is* readable).
> That traps (as expected), but the trap handler injects SIGSEGV due to
> sig_on_uaccess_fault==1.

So the perf thing tries to walk the entire stack in order to obtain a
callchain. Its fairly common to hit crap when attempting this :-)
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