[Bug runtime/14659] task_finder2 breaks ptrace apps

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14659

--- Comment #3 from David Smith <dsmith at redhat dot com> 2012-10-08 20:42:33 UTC ---
(In reply to comment #2)
> If there's really a problem between the kernel's syscall tracing and ptrace,
> then we should report this as a kernel bug.  But right now, it seems like
> there's more going on...

Looks like you are right that it isn't syscall probing directly.

Looking back at the test script I posted earlier:

====
# functions
function doit()
%{ /* pragma:vma */

    _stp_print("never\n");
%}

# probes
probe never {
      doit()
}
====

That script causes the bad SIGTRAP behavior.  However, if I stub out
_stp_vma_init() and _stp_vma_done() I don't see the SIGTRAPs.

So, it isn't the syscall tracing in the vma tracking stuff, but it is something
else that the vma tracking does.

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