vkernel livelocked and core dumped when killed on -HEAD
dillon at apollo.backplane.com
Wed Apr 30 09:55:37 PDT 2008
:Tried to cvs checkout the pkgsrc tree and managed to get "intr 1 at 40001/40000
:hz, livelocked limit engaged!". After kill-ing it, it core dumped. The
:backtrace repeats itself over and over, I uploaded kernel and kernel.core to
Did the vkernel actually lock-up or was it still responding? e.g. did
you try ^Z'ing or ^C'ing the checkout? It is quite possible that
the IO co-thread actually managed to exceed the livelock limit without
it being a bug.
The crash was due to the IO co-thread crashing. The IO co-thread took
the shutdown signal from the vkernel when you killed it, but since it
doesn't have a globaldata context that blew it up.
I will mask the shutdown signal on the co-thread to fix the core
dumping issue but we still need to investigate the livelock. Have
you been able to reproduce it?
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