runtime/pprof: failures with SIGSEGV on linux-amd64-longtest

[bcmills]

#!watchflakes
post <- pkg == "runtime/pprof" && `signal: segmentation fault`

From a SlowBot on https://go.dev/cl/428716 (https://storage.googleapis.com/go-build-log/38af0500/linux-amd64-longtest_88ed84a0.log):

signal: segmentation fault (core dumped)
FAIL	runtime/pprof	48.544s

There is also one of these in a very recent dashboard log:
greplogs -l -e 'signal: segmentation fault .*\nFAIL\s+runtime/pprof' --since=2022-01-01
2022-09-06T15:44:28-32f68b5/linux-amd64-longtest

[bcmills]

Marking as release-blocker at least until we can determine whether this is a Go 1.20 regression.

[gopherbot]

Found new matching dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && `signal: segmentation fault`

2022-09-06 15:44 linux-amd64-longtest go@32f68b5a runtime/pprof (log)

signal: segmentation fault (core dumped)

— watchflakes

[aclements]

Duplicate of #54885