runtime/pprof: apparent deadlock in TestGoroutineSwitch on linux-armv6l [1.17 backport]

[prattmic]

#47505 should be considered for backport to the 1.17 major release.

This bug is not new and can cause deadlocks on linux/arm (GOARM=6) when profiling is turned on with no workaround. The biggest immediate issue for us is that this will cause new failures on all release builders, if not fixed.

I had to file this manually due to #25574.

[gopherbot]

Change https://golang.org/cl/341890 mentions this issue: [release-branch.go1.17] runtime: drop SIGPROF while in ARM < 7 kernel helpers

[dmitshur]

Approved as a fix for a serious issue without a workaround. This backport applies to both 1.17 (this issue) and 1.16 (#47675).

[gopherbot]

Closed by merging f7b9470 to release-branch.go1.17.