internal/poll: deadlock in Read on arm64 when an FD is closed [1.17 backport] #50611
Description
@bcmills requested issue #45211 to be considered for backport to the next 1.17 minor release.
@gopherbot, please backport to 1.17 and 1.16: this is a race condition that can result in deadlocks on ARM64 in any process that relies on Close unblocking a read. It is tricky to diagnose (and hard to reproduce reliably), and there is no apparent workaround for users on ARM64 machines.