runtime: timeout in TestSelectStackAdjust on openbsd-arm64-jsing

[bcmills]

##### GOMAXPROCS=2 runtime -cpu=1,2,4 -quick
panic: test timed out after 25m0s
…

goroutine 155437 [runnable]:
runtime.gcTrigger.test({0x0?, 0x0?, 0x0?})
	/home/gopher/build/go/src/runtime/mgc.go:546 +0x140 fp=0x400095a670 sp=0x400095a670 pc=0x2c5d0
runtime.mallocgc(0x20, 0x2881e0, 0x1)
	/home/gopher/build/go/src/runtime/malloc.go:1143 +0x820 fp=0x400095a6e0 sp=0x400095a670 pc=0x1dd60
runtime.newobject(0x4000000003?)
	/home/gopher/build/go/src/runtime/malloc.go:1198 +0x2c fp=0x400095a710 sp=0x400095a6e0 pc=0x1df1c
runtime_test.TestSelectStackAdjust(0x400130e680)
	/home/gopher/build/go/src/runtime/chan_test.go:728 +0x78 fp=0x400095a760 sp=0x400095a710 pc=0x1a6c48
testing.tRunner(0x400130e680, 0x2c81a8)
	/home/gopher/build/go/src/testing/testing.go:1449 +0x10c fp=0x400095a7b0 sp=0x400095a760 pc=0xf9edc
testing.(*T).Run.func1()
	/home/gopher/build/go/src/testing/testing.go:1496 +0x2c fp=0x400095a7d0 sp=0x400095a7b0 pc=0xfac1c
runtime.goexit()
	/home/gopher/build/go/src/runtime/asm_arm64.s:1155 +0x4 fp=0x400095a7d0 sp=0x400095a7d0 pc=0x829d4
created by testing.(*T).Run
	/home/gopher/build/go/src/testing/testing.go:1496 +0x328
FAIL	runtime	1500.225s
FAIL

greplogs -l -e 'goroutine \d+ \[.*\]:\n(?:.+\n\t.+\n)*runtime_test\.TestSelectStackAdjust' --since=2022-01-01
2022-05-08T17:23:05-507a44d/openbsd-arm64-jsing

Given the host, it isn't clear to me whether this is related to #52703.

(attn @4a6f656c; CC @golang/openbsd, @golang/runtime)

[4a6f656c]

I believe this will also be related to the OpenBSD 7.1 kernel issue mentioned in #52703.

[gopherbot]

Change https://go.dev/cl/410095 mentions this issue: dashboard: remove known issue for openbsd-arm64-jsing