runtime: TestGdbCoreCrashThreadBacktrace broken on linux-amd64-nocgo builder as of CL 536895

[bcmills]

Go version

de5b418

What operating system and processor architecture are you using (go env)?

linux-amd64-nocgo at de5b418bea70aaf27de1f47e9b5813940d1e15a4

:: Running /workdir/go/src/make.bash with args ["/workdir/go/src/make.bash" "-force"] and env ["HOSTNAME=buildlet-linux-amd64-bullseye-rn04df84c" "HOME=/root" "SHLVL=0" "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" "DEBIAN_FRONTEND=noninteractive" "GO_STAGE0_NET_DELAY=0s" "GO_STAGE0_DL_DELAY=300ms" "WORKDIR=/workdir" "GOROOT_BOOTSTRAP=/workdir/go1.4" "GO_BUILDER_NAME=linux-amd64-nocgo" "CGO_ENABLED=0" "GO_DISABLE_OUTBOUND_NETWORK=1" "USER=root" "GOBIN=" "TMPDIR=/workdir/tmp" "GOCACHE=/workdir/gocache" "GOPLSCACHE=/workdir/goplscache" "PWD=/workdir/go/src"] in dir /workdir/go/src

What did you do?

https://build.golang.org/log/80fba6241f55a666aae3c5ea52e461d40188ff7b

What did you expect to see?

Passing tests.

What did you see instead?

--- FAIL: TestGdbCoreCrashThreadBacktrace (2.33s)
    runtime-gdb_test.go:81: gdb version 10.1
    runtime-gdb_unix_test.go:316: building source exit status 1
        go: no Go source files
FAIL
FAIL	runtime	19.935s

This test was added in https://go.dev/cl/536895.

[gopherbot]

Change https://go.dev/cl/547135 mentions this issue: runtime: require cgo for cgo gdb test