With GENERIC HEAD from May 10 17:58 UTC I got a livelock. This is old and reoccurring problem that I only get while stress testing. The livelock can be unlocked by issuing a kill from ddb to the curthread. More info at http://www.holm.cc/stress/log/cons129.html, which also includes a KTR dump (KTR_INTR|KTR_PROC|KTR_RUNQ|KTR_SYSC|KTR_CLK| KTR_TRAP) -- Peter Holm