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In libgo the kickoff function for g0 can be invoked without a p, for example from mcall(exitsyscall0) in exitsyscall after exitsyscall has cleared the p field. The assignment gp.param = nil will invoke a write barrier. If gp.param is not already nil, this will require a p. Avoid the problem for a specific case that is known to be OK: when the value in gp.param is a *g. Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu. Committed to mainline. Ian
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