https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200319
Bug ID: 200319
Summary: Bridge+CARP crashes/freezes
Product: Base System
Version: 10.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 156928
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156928&action=edit
Fixes on carp+bridge freeze
The interaction between carp and bridge code makes the OS hang.
If there is a bridge with member an interface that has a CARP ip and no minimal
amount of traffic flowing in the system result is a hang of the system and
sometimes a crash.
Reference https://redmine.pfsense.org/issues/4607
After analysis seems that the carp code uses taskqueue_swi for scheduling
demotion events.
The carp CIF lock had a lot of contention.
ether_input was doing duplicate checks of bridge_input causing even more
contention on the CIF lock.
Attached patch converts CIF lock to RW lock.
It avoids duplicate checks from ether_input in case of bridge
schedules the taskqueue as taskqueue_thread rather than a SWI thread.
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