A complete snippet to reproduce this may be useful. That
said, I have code that uses qlock and rendez heavily with
no sleeps, and have not had any issues on 9front.
Quoth ibrahim via 9fans <9fans@9fans.net>:
> I have a function chan_send in which :
> chan_send (...) {
> qlock()
> rwakeup(...)
> qunlock()
> }
>
> If two such chan_send functions are called without a "task-switch" 9vx
> crashes. A work around for this problem is to place a sleep(0) after qunlock
> to enforce a task-switch
>
> chan_send(...) {
> qlock()
> rwakeup(...)
> qunlock()
> sleep(0)
> }
>
> This behaviour isn't documented anywhere. I'll test it next on bare metal
> with a real kernel to find out if this is only a 9vx problem.
>
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