vkernel livelocked and core dumped when killed on -HEAD

Rumko rumcic at gmail.com
Wed Apr 30 10:11:23 PDT 2008

Matthew Dillon wrote:

> :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 leaf:~rumko/crash/vkernel/30.04.2008/
>     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?
> -Matt

If I remember correctly, it was completely locked-up, but I will retry tonight.

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