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libgo patch committed: Don't crash if no p in kickoff


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

Attachment: patch.txt
Description: Text document


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