https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204298
Bug ID: 204298
Summary: xpt_release_device() panic: mutex CAM queue lock not
owned
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 162793
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162793&action=edit
cam_xpt.c device callout patch
xpt_release_device() calls callout_stop() without holding the callout mutex
(devq->send_mtx).
When testing large-scale repeated FC device removal, we ran into panics where
xpt_release_device() was reaching refcount 0 while the callout was pending (or
at least active).
The attached patch will give the device callout a ref on the device while the
device callout is active, to ensure the device can't be destroyed until the
callout is either stopped or finishes executing.
Sponsored by: EMC / Isilon Storage Division
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