x/net/http2: TestServer_MaxQueuedControlFrames failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestServer_MaxQueuedControlFrames"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestServer_MaxQueuedControlFrames
    server_test.go:1373: unexpected frame after exceeding maxQueuedControlFrames; want closed conn
        [FrameHeader PING flags=ACK len=8]
--- FAIL: TestServer_MaxQueuedControlFrames (0.22s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestServer_MaxQueuedControlFrames"

2024-05-28 22:41 x_net-go1.21-linux-arm net@03c24c2d release-branch.go1.21@54c4745d x/net/http2.TestServer_MaxQueuedControlFrames (log)

=== RUN   TestServer_MaxQueuedControlFrames
    server_test.go:1373: unexpected frame after exceeding maxQueuedControlFrames; want closed conn
        [FrameHeader PING flags=ACK len=8]
--- FAIL: TestServer_MaxQueuedControlFrames (0.22s)

— watchflakes

[neild]

I believe this was already fixed by https://go.dev/cl/586249, which (among other things) changes TestServer_MaxQueuedControlFrames to check for a closed connection rather than a read error.

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestServer_MaxQueuedControlFrames"

2024-05-28 22:41 x_net-go1.21-freebsd-riscv64 net@03c24c2d release-branch.go1.21@9488a444 x/net/http2.TestServer_MaxQueuedControlFrames (log)

=== RUN   TestServer_MaxQueuedControlFrames
    server_test.go:1373: unexpected frame after exceeding maxQueuedControlFrames; want closed conn
        [FrameHeader PING flags=ACK len=8]
--- FAIL: TestServer_MaxQueuedControlFrames (0.40s)

2024-05-28 22:41 x_net-go1.22-freebsd-riscv64 net@9f5b79b0 release-branch.go1.22@74565750 x/net/http2.TestServer_MaxQueuedControlFrames (log)

=== RUN   TestServer_MaxQueuedControlFrames
    server_test.go:1373: unexpected frame after exceeding maxQueuedControlFrames; want closed conn
        [FrameHeader PING flags=ACK len=8]
--- FAIL: TestServer_MaxQueuedControlFrames (0.54s)

— watchflakes

[neild]

net@03c24c2d
net@9f5b79b0

Both are before https://go.dev/cl/586249.