panic: SipBuf: invalid parameters
cpuid = 0
Trace beginning at frame 0xfffff8011870b6a8
SipBuf() at SipBuf+0xc5 0xffffffff809f92e5 
SipBuf() at SipBuf+0xc5 0xffffffff809f92e5 
SipHash_Update() at SipHash_Update+0x94 0xffffffff809f9434 
SipHash24_TestVectors() at SipHash24_TestVectors+0x7f 0xffffffff826000bf 
siphashtest_modevent() at siphashtest_modevent+0x2c 0xffffffff8260002c 
module_register_init() at module_register_init+0x49 0xffffffff806232e9 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db> 

--- captured from dfbsd-qemu serial console (vm.sh log) after:
    kldload /tmp/sipmod/siphashtest.ko
on DragonFly 6.5-DEVELOPMENT #0 X86_64_GENERIC (INVARIANTS).
ssh died during kldload; vm.sh status => down (DDB).