[Bug runtime/11859] New: print_ubacktrace() from kernel return probe prints kretprobe addresses

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

The logic in _stp_stack_print for printing user backtraces from kretprobes is
confused. e.g:

stap -d /usr/bin/zenity --ldd -e 'probe syscall.open.return { if (pid() ==
target() && $return < 0) { log("opened: " . user_string($filename) . ", failed:
" . retstr); print_ubacktrace(); } }' -c '/usr/bin/zenity --info'

opened: /usr/share/locale/en.UTF-8/LC_MESSAGES/gtk20.mo, failed: -2 (ENOENT)
Returning from:  0xc04c6e4a
Returning to  :  0xc0771034
 0x84a453 : __open_nocancel+0x19/0x76 [libc-2.12.so]
 0x7a3788 : _nl_load_domain+0xc8/0x10da [libc-2.12.so]
 0x7a36ac : _nl_find_domain+0x2cc/0x2e0 [libc-2.12.so]
 0x7a2db1 : __dcigettext+0x331/0x81b [libc-2.12.so]
 0x7a1ba3 : dcgettext+0x43/0x50 [libc-2.12.so]
 0x437bc4 : g_dgettext+0x54/0x70 [libglib-2.0.so.0.2512.0]
 0x372d9b5 : gtk_get_option_group+0x45/0xe0 [libgtk-x11-2.0.so.0.2000.1]
 0x372dadb : gtk_parse_args+0x8b/0x110 [libgtk-x11-2.0.so.0.2000.1]
 0x372db85 : gtk_init_check+0x25/0x50 [libgtk-x11-2.0.so.0.2000.1]
 0x372dbd5 : gtk_init+0x25/0x90 [libgtk-x11-2.0.so.0.2000.1]
 0x804d775 : _init+0x23c9/0x8970 [zenity]

The "Returning from" and "Returning to" lines shouldn't be there (they are
kernel addresses).

-- 
           Summary: print_ubacktrace() from kernel return probe prints
                    kretprobe addresses
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: mjw at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11859

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