cmd/compile: "internal compiler error: mayCall" while running unsafebuiltins test on linux-amd64-noopt builder

[bcmills]

The linux-amd64-noopt builder is consistently failing due to an internal compiler error: mayCall in test/unsafebuiltins.go (added in CL 312214 for #19367 and #40481).

##### ../test
# go run run.go -- unsafebuiltins.go
exit status 2
# command-line-arguments
./unsafebuiltins.go:22:20: internal compiler error: mayCall 
.   UNSAFEADD tc(1) UNSAFEPTR-unsafe.Pointer # unsafebuiltins.go:22 UNSAFEPTR-unsafe.Pointer
.   .   NAME-main.p1 esc(no) tc(1) Class:PAUTO Offset:0 OnStack Used UNSAFEPTR-unsafe.Pointer # unsafebuiltins.go:21
.   .   LITERAL-1 tc(1) int # unsafebuiltins.go:22

goroutine 1 [running]:
runtime/debug.Stack()
	/workdir/go/src/runtime/debug/stack.go:24 +0x7a
cmd/compile/internal/base.FatalfAt({0x2, 0x16140}, {0x10f7acb, 0xb}, {0xc00040e9c8, 0x1, 0x1})
	/workdir/go/src/cmd/compile/internal/base/print.go:227 +0x20a
cmd/compile/internal/walk.mayCall.func2({0x12338e0, 0xc0003d5020})
	/workdir/go/src/cmd/compile/internal/walk/walk.go:309 +0x7b2
cmd/compile/internal/ir.Any.func1({0x12338e0, 0xc0003d5020})
	/workdir/go/src/cmd/compile/internal/ir/visit.go:130 +0x4d
cmd/compile/internal/ir.(*BinaryExpr).doChildren(0xc0003d4480, 0xc00041e228)
	/workdir/go/src/cmd/compile/internal/ir/node_gen.go:193 +0xab
cmd/compile/internal/ir.DoChildren({0x12338e0, 0xc0003d4480}, 0xc00041e228)
	/workdir/go/src/cmd/compile/internal/ir/visit.go:94 +0x4c
cmd/compile/internal/ir.Any.func1({0x12338e0, 0xc0003d4480})
	/workdir/go/src/cmd/compile/internal/ir/visit.go:130 +0x74
cmd/compile/internal/ir.Any({0x12338e0, 0xc0003d4480}, 0xc00005d7b0)
	/workdir/go/src/cmd/compile/internal/ir/visit.go:132 +0x10f
cmd/compile/internal/walk.mayCall({0x12338e0, 0xc0003d4480})
	/workdir/go/src/cmd/compile/internal/walk/walk.go:300 +0xa9
cmd/compile/internal/walk.walkCall1(0xc00017c7e0, 0xc00040f690)
	/workdir/go/src/cmd/compile/internal/walk/expr.go:584 +0x77c
cmd/compile/internal/walk.walkCall(0xc00017c7e0, 0xc00040f690)
	/workdir/go/src/cmd/compile/internal/walk/expr.go:542 +0x9e5
cmd/compile/internal/walk.walkExpr1({0x1233b38, 0xc00017c7e0}, 0xc00040f690)
	/workdir/go/src/cmd/compile/internal/walk/expr.go:172 +0x928
cmd/compile/internal/walk.walkExpr({0x1233b38, 0xc00017c7e0}, 0xc00040f690)
	/workdir/go/src/cmd/compile/internal/walk/expr.go:55 +0x44d
cmd/compile/internal/walk.walkStmt({0x1233b38, 0xc00017c7e0})
	/workdir/go/src/cmd/compile/internal/walk/stmt.go:59 +0x9da
cmd/compile/internal/walk.walkStmtList({0xc00036aa00, 0x1a, 0x20})
	/workdir/go/src/cmd/compile/internal/walk/stmt.go:169 +0x89
cmd/compile/internal/walk.Walk(0xc00001e6e0)
	/workdir/go/src/cmd/compile/internal/walk/walk.go:43 +0x1f7
cmd/compile/internal/gc.prepareFunc(0xc00001e6e0)
	/workdir/go/src/cmd/compile/internal/gc/compile.go:86 +0x73
cmd/compile/internal/gc.enqueueFunc(0xc00001e6e0)
	/workdir/go/src/cmd/compile/internal/gc/compile.go:60 +0x389
cmd/compile/internal/gc.Main(0x11236d8)
	/workdir/go/src/cmd/compile/internal/gc/main.go:281 +0x1231
main.main()
	/workdir/go/src/cmd/compile/main.go:55 +0x15e

CC @mdempsky @randall77 @cuonglm

[mdempsky]

Thanks.

I think this should just be a matter of adding OUNSAFEADD and OUNSAFESLICE to the switch statement in mayCall. I'll send a CL tomorrow if no one beats me to it.

[gopherbot]

Change https://golang.org/cl/316170 mentions this issue: cmd/compile: fix linux-amd64-noopt builder