[Bug runtime/15669] New: syscall probe handlers are called exactly twice for every syscall on Amazon Linux

["agentzh at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15669

            Bug ID: 15669
           Summary: syscall probe handlers are called exactly twice for
                    every syscall on Amazon Linux
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com

For every syscall on Amazon Linux (kernel 3.2.39-6.88.amzn1.x86_64 ), the
syscall.* probe handlers are always called exactly twice.

>From the dmesg output, it seems that Amazon Linux is running by Xen:

    $ dmesg|grep Xen
    [    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
    [    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
    [    0.000000]  Xen: 0000000000100000 - 0000000446400000 (usable)
    [    0.000000] Booting paravirtualized kernel on Xen
    [    0.000000] Xen version: 3.4.3.amazon (preserve-AD)
    [    0.000000] Xen: using vcpuop timer interface
    [    0.000000] installing Xen timer for CPU 0
    [    0.044854] installing Xen timer for CPU 1
    [    0.068736] PCI: setting up Xen PCI frontend stub
    [    0.324525] Initialising Xen virtual ethernet driver.

utrace is enabled in the kernel:

    $ grep CONFIG_UTRACE /boot/config-`uname -r`
    CONFIG_UTRACE=y

systemtap is using a recent git master (commit 56098c7902 ).

Some more information about the system:

    $ cat /etc/issue
    Amazon Linux AMI release 2013.03
    Kernel \r on an \m

Any suggestions on tracking this issue further. Sorry if this is not the right
place to report an issue related to a kernel maintained by Amazon.

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