0: kd> u @rip
nt!KxWaitForSpinLockAndAcquire+0x20:
fffff800`02a6ec60 488b0f mov rcx,qword ptr [rdi]
fffff800`02a6ec63 4885c9 test rcx,rcx
fffff800`02a6ec66 75e8 jne nt!KxWaitForSpinLockAndAcquire+0x10 (fffff800`02a6ec50)
fffff800`02a6ec68 f0480fba2f00 lock bts qword ptr [rdi],0
fffff800`02a6ec6e 72e0 jb nt!KxWaitForSpinLockAndAcquire+0x10 (fffff800`02a6ec50)
fffff800`02a6ec70 8bc3 mov eax,ebx
fffff800`02a6ec72 488b5c2430 mov rbx,qword ptr [rsp+30h]
fffff800`02a6ec77 4883c420 add rsp,20h