Hi,

I just got this panic on current source supped midnight GMT 26th July
(today...). I haven't seen anyone else mention this, it happened when i
ran 'fg' in a tcsh root shell.

System dropped to debugger, i typed 'panic' but it couldn't dump to
disk, it printed the _sx_xlock panic below many times then rebooted.

panic: blockable sleep lock (sleep mutex) Giant @ /usr/src/sys/vm/vm_fault.c:206
panic: from debugger
Uptime: 2h40m47s
Dumping 127 MB
ata0: resetting devices ..
panic: msleep
Uptime: 2h40m47s
panic: witness_destroy: lock (sleep mutex) pseudofs_vncache is not initialized
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
U
Fatal double fault:
eip = 0xc02e804d
esp = 0xc981b000
ebp = 0xc981b008
panic: double fault
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s
panic: _sx_xlock (shutdown_post_sync): xlock already held @ 
/usr/src/sys/kern/kern_shutdown.c:341
Uptime: 2h40m47s


Gavin


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