[Bug tapsets/16991] New: infinite loop in task_dentry_path

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16991

            Bug ID: 16991
           Summary: infinite loop in task_dentry_path
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
                CC: henrik at kaarposoft dot dk

As noted in the following email thread,

<https://sourceware.org/ml/systemtap/2014-q2/msg00136.html>

there is a infinite loop in task_dentry_path when it hits virtual file systems
(like the pipe file system). Here's a reproducer:

===================
cd /tmp
mkdir T
cd T
cat > t.sh <<"EOF1"
KX_BASE="$(cd $(dirname ".")/../..; pwd -P)"
echo $KX_BASE
EOF1
cat > t.stp <<"EOF2"
global FSNOTIFY_EVENT_PATH    = 1;
probe kernel.function("fsnotify") {
    if (!target_set_pid(pid())) { next; }
    if ($data_is==FSNOTIFY_EVENT_PATH) {
        path = task_dentry_path(task_current(),
            @cast($data, "path")->dentry,
            @cast($data, "path")->mnt);
        println(path);
}    }
EOF2
stap -v -c "sh t.sh" t.stp
===================

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