Impact of changes made to umass.c at r232358

[Terence Telkamp]

One thing I forgot to mention is that I have a machine in the kernel debugger after the panic, so I can capture more information if any would be helpful.

-----Original Message-----
From: owner-freebsd-usb at freebsd.org [mailto:owner-freebsd-usb at freebsd.org] On Behalf Of Terence Telkamp
Sent: Friday, April 06, 2012 11:17 AM
To: freebsd-usb at freebsd.org
Subject: Impact of changes made to umass.c at r232358

I am seeing a kernel panic in FreeBSD 8.1, which is reproduced after physically attaching and detaching a USB device several times.  The kernel debugger shows that the panic happens in camisr where the cam_sim and its associated mutex are clearly destroyed.  sim->refcount is 0, sim->softc is 1 (UMASS_GONE), and the sim->mtx is destroyed (mtx_lock = 6).

This looks very similar to FreeBSD PR kern/153514, which is unfortunately unresolved.

http://www.freebsd.org/cgi/query-pr.cgi?pr=153514


Is it possible that the changes made to umass.c at r232358 might fix this issue?


Terence Telkamp
Storage Development Associate Engineer II Dell | Compellent


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