mutex error in callout_softclock()

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hi,
I get the panic below on several different -current Xen dom0. Any hint at
what could cause this ?

Mutex error: mutex_vector_exit: exiting unheld spin mutex

lock address : 0xffffffff80b27380
current cpu  :                  0
current lwp  : 0xffffa000121e92e0
owner field  : 0x0000000000000600 wait/spin:                0/1

panic: lock error
Stopped in pid 0.5 (system) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x25b
lockdebug_abort() at netbsd:lockdebug_abort+0x42
mutex_vector_exit() at netbsd:mutex_vector_exit+0xd7
callout_softclock() at netbsd:callout_softclock+0x263
softint_thread() at netbsd:softint_thread+0x89

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--