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From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/18889] New: lost ability to probe kernel module initializers
Date: Fri, 28 Aug 2015 22:24:00 -0000
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X-Bugzilla-Product: systemtap
X-Bugzilla-Component: runtime
X-Bugzilla-Version: unspecified
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X-Bugzilla-Who: fche at redhat dot com
X-Bugzilla-Status: NEW
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https://sourceware.org/bugzilla/show_bug.cgi?id=18889

            Bug ID: 18889
           Summary: lost ability to probe kernel module initializers
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

On recent kernels, a probe requested on module .init.* functions no longer
receives hits.  This appears to be because the kernel MODULE_STATE_COMING
notification is coming too early (before the module_sect_attrs are set), so we
cannot relocate symbols against .init.*, and thus cannot place probes.  The
bz6503.* test case was too permissive to let us discover this immediately.  The
kernel change that broke stap has not yet been identified.

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