[Bug runtime/13210] New: vdso runtime tracking is broken

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13210

             Bug #: 13210
           Summary: vdso runtime tracking is broken
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


vdso tracking is broken, which means user backtraces of kernel probes that get
accessed through the vdso are broken (since they cannot unwind through the
vdso).

This seems to be caused by buildid checking, which always fails.
-DDEBUG_TASK_FINDER_VMA will show:

_stp_vma_init:211: registering vmcb (_stap_target: 32045)
_stp_vma_exec_cb:88: tsk 32045:32045 , register_p: 1, process_p: 1
_stp_vma_match_vdso:32: tsk: 32045 vdso: 0x2c5000
_stp_vma_match_vdso:44: notes_addr vdso32-int80.so: 0x2c51d8
_stp_vma_match_vdso:57: darn, not equal (rc=0) at 0 (40 != 132)
[...]

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