panic: lockdebug_lookup: uninitialized lock... (from kvtopte()) is what you get if you try kgdb on amd64.
On connecting, I see: ... Sending packet: $qAttached#8f...Ack Packet received: Packet qAttached (query-attached) is NOT supported Sending packet: $g#67...Ack Packet received: 000000000000000000908181ffffffff010000000000000000908181ffffffff00908181ffffffffd0070000000000008509d980ffffffff080000000000000000000000000000000000000000000000000000000000000080070000000000000a1800000000000090e30f01000000000000000000000000189052ca00000000 Sending packet: $m81819000,1#65...Ack That $m81819000 leads to sys/arch/amd64/amd64/kgdb_machdep.c:kgdb_acc() and the panic is in pte = kvtopte(va); with va=0x81819000; kvtopte() is defined in sys/arch/x86/include/pmap.h: static __inline pt_entry_t * __unused vtopte(vaddr_t va) { KASSERT(va < VM_MIN_KERNEL_ADDRESS); return (PTE_BASE + pl1_i(va)); } #define pl1_i(VA) (((VA_SIGN_POS(VA)) & L1_FRAME) >> L1_SHIFT) So, where is the lock? (or is the address illegal?) Cheers, Patrick