[Bug runtime/16861] New: probes aren't re-registered after module reload

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16861

            Bug ID: 16861
           Summary: probes aren't re-registered after module reload
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: jistone at redhat dot com

With emit_module_refresh, we can support probes in modules that weren't loaded
at the time stap started.  However, if a module is unloaded and then loaded
again, we miss the chance to register the probes anew.

For example, on a system not already using btrfs.ko:

$ stap -e 'probe module("btrfs").function("*_btrfs_fs").call {
println(ppfunc()) }' -c 'sudo sh -c "modprobe btrfs; modprobe -r btrfs;
modprobe btrfs; modprobe -r btrfs"'
init_btrfs_fs
exit_btrfs_fs

The init and exit are only noticed once, despite being loaded twice.

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