ZFS and sh(1) panic: spin lock [lock addr] (smp rendezvous) held by [sh(1) proc tid] too long

Brandon Gooch jamesbrandongooch at gmail.com
Wed Jan 27 17:41:49 UTC 2010

The machine, a Dell Optiplex 755, has been locking up recently. The
situation usually occurs while using VirtualBox (running a 64-bit
Windows 7 instance) and doing anything else in another xterm (such as
rebuilding a port).  I've been unable to reliably reproduce it (I'm in
an X session and the machine will not panic "properly").

However, while rebuilding Xorg today at ttyv0 and runnning
VBoxHeadless on ttyv1, I managed to trigger what I believe is the

I've attached a textdump in hopes that someone may be able to take a
look and provide clues or instruction on debugging this.


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