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[Bug runtime/9947] lockdep triggered on rawhide with tracepoints
- From: "jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 13 Mar 2009 00:41:07 -0000
- Subject: [Bug runtime/9947] lockdep triggered on rawhide with tracepoints
- References: <20090312190600.9947.jistone@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From jistone at redhat dot com 2009-03-13 00:41 -------
The scenario to make this actually deadlock seems to be pretty pathological. We
would have to be unregistering a tracepoint from the work queue at the same time
as cleanup_module is trying to destroy the work queue. We only run the work
queue while there's a transport channel attached though, which means the module
refcnt is non-zero, so the only way to also be in cleanup_module is with a
*forced* rmmod. Even the rmmod manpage says that forcing is extremely
dangerous, so I wouldn't apologize too much if we locked up in that scenario.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9947
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