exclusive sleep mutex mskc0 (network driver) r = 0 (0xc32c3690) locked @ /usr/src/sys/dev/msk/if_msk.c:3589

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I updated to current yesterday and got the following 'witness_warn'
panic upon executing 'reboot':

suspending ithread with the following locks held:
exclusive sleep mutex mskc0 (network driver) r = 0 (0xc32c3690) locked _at_
/usr/src/sys/dev/msk/if_msk.c:3589
panic: witness_warn
cpuid = 0
KDB: enter: panic
Physical memory: 495 MB
Dumping 80 MB: 65 49 33 17 1


   3579 static void
   3580 msk_intr(void *xsc)
   3581 {
   3582     struct msk_softc *sc;
   3583     struct msk_if_softc *sc_if0, *sc_if1;
   3584     struct ifnet *ifp0, *ifp1;
   3585     uint32_t status;
   3586     int domore;
   3587
   3588     sc = xsc;
   3589     MSK_LOCK(sc);
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