tree 86108db41db707b2ecf9a7cbd04d57eb677e7b77
parent d2e5035098b3de466b3d1632f4e8d2e6f9b69e33
author Damien Neil <dneil@google.com> 1633538177 -0700
committer Damien Neil <dneil@google.com> 1633546951 +0000

http2: detect write-blocked PING frames

We start the PingTimeout timer before writing a PING frame.
However, writing the frame can block indefinitely (either
acquiring cc.wmu or writing to the conn), and the timer is
not checked until after the frame is written.

Move PING writes into a separate goroutine, so we can detect
write-blocked connections.

Fixes golang/go#48810.

Change-Id: Ifd67fa23799e750d02754e1fe5d32719f60faed4
Reviewed-on: https://go-review.googlesource.com/c/net/+/354389
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>