[Bug runtime/12947] New: Use of hardware watchpoint causing oops

["wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12947

           Summary: Use of hardware watchpoint causing oops
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: wcohen@redhat.com


Created attachment 5825
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5825
Serial console of the run with the oops

I was experimenting to the hardware watchpoints.

I had one script that would give me an address of the place going to probe and
then had another another script to initialize the hardware watchpoint and
record backtraces when the memory location was accessed.

Find the address with:

[wcohen@montague tmp]$ stap -g find_free_ram_addr.stp
&global_page_state(NR_FREE_PAGES) = 0xffffffffc0bb0eb0

Then set monitoring with:

[wcohen@montague tmp]$ stap -g track_free_ram.stp 0xc0bb0eb0

Attached is log of the run.

This was using

kernel-2.6.38.8-32.fc15.i686
systemtap-1.5-1.fc15.i686

It seems like that the hw watch points should be better behaved.

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