[Bug runtime/16719] systemtap runs hold vmlinux file descriptor open

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16719

Josh Stone <jistone at redhat dot com> changed:

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                 CC|                            |jistone at redhat dot com

--- Comment #1 from Josh Stone <jistone at redhat dot com> ---
(In reply to Lars R. Damerow from comment #0)
> Can this file descriptor be closed once the kernel module is built?

There's no technical reason not to.  Nearly all resources used during passes
1-4 could be released for pass 5, and I think we do some, just not all.  I
thought we did release all the dwfl handles, which would include the open
vmlinux, but I could be wrong (or we could have something like a refcount
leak).

As a workaround, you could use stap -p4 to build the module, then staprun
separately to load and run it.  That will give you the least runtime overhead
possible, with none of the build-time files open nor the associated memory use.
 But we should still make stap cleanup after pass1-4 as much as possible.

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