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runtime/secret:runtimesecret: TestHeap failures [consistent failure] #76586

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Description

@gopherbot
#!watchflakes
default <- pkg == "runtime/secret:runtimesecret" && test == "TestHeap"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestHeap
runtime: pointer 0x10c00012c000 to unallocated span span.base()=0x10c00012c000 span.limit=0x10c00012e000 span.state=0
fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?)

goroutine 38 gp=0x10c0000acf08 m=0 mp=0x13687e0 [running]:
runtime.throw({0x83cfa0?, 0x10c000090d78?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:1229 +0x48 fp=0x10c000090d98 sp=0x10c000090d68 pc=0x5643c8
runtime.badPointer(0x78ffdc517f08, 0x10c00012c000, 0x0, 0x0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mbitmap.go:1334 +0x165 fp=0x10c000090de8 sp=0x10c000090d98 pc=0x500ba5
runtime.findObject(0x78ffdc517808?, 0x0?, 0x7930f1?)
...
runtime.gopark(0xb02b5afd4b?, 0x1?, 0x32?, 0x28?, 0x0?)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/proc.go:462 +0xce fp=0x10c000219f40 sp=0x10c000219f20 pc=0x56456e
runtime.gcBgMarkWorker(0x10c000166210)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1791 +0xeb fp=0x10c000219fc8 sp=0x10c000219f40 pc=0x50a7cb
runtime.gcBgMarkStartWorkers.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1695 +0x17 fp=0x10c000219fe0 sp=0x10c000219fc8 pc=0x50a6b7
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1776 +0x1 fp=0x10c000219fe8 sp=0x10c000219fe0 pc=0x56ba01
created by runtime.gcBgMarkStartWorkers in goroutine 7
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1695 +0x105

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