vn0: MBR magic not found; assume a COMPATIBILITY_SLICE (s0)
vn1: MBR magic not found; assume a COMPATIBILITY_SLICE (s0)
panic: assertion "count & TOK_COUNTMASK" failed in _lwkt_reltokref at /usr/src/sys/kern/lwkt_token.c:458
cpuid = 0
Trace beginning at frame 0xfffff8011859d2e8
lwkt_relalltokens() at lwkt_relalltokens+0x80 0xffffffff80679380 
lwkt_relalltokens() at lwkt_relalltokens+0x80 0xffffffff80679380 
panic() at panic+0xda 0xffffffff8065d56a 
lwkt_gettoken() at lwkt_gettoken+0x299 0xffffffff80679649 
udf_hashlookup() at udf_hashlookup+0x30 0xffffffff82602920 
udf_vget() at udf_vget+0x2f 0xffffffff8260045f 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped