Impact

Processes using tableflip may encounter hung goroutines in the parent process, after a failed upgrade.

The Go runtime has annoying behaviour around setting and clearing
O_NONBLOCK: exec.Cmd.Start() ends up calling os.File.Fd() for any
file in exec.Cmd.ExtraFiles. os.File.Fd() disables both the use
of the runtime poller for the file and clears O_NONBLOCK from
the underlying open file descriptor.

This can lead to goroutines hanging in a parent process, after at least
one failed upgrade. The bug manifests in goroutines which rely on
either a deadline or interruption via Close() to be unblocked being stuck
in read or accept like syscalls. As far as I can tell we've not experienced
this problem in production, so it's most likely quite rare.

Patches

The problem has been fixed in v1.2.2.

Workarounds

None.

References

• cae714b