node_unit_tests::http2_test is very flaky

[dsherret]

---- node_unit_tests::http2_test stdout ----
command /Users/runner/work/deno/deno/target/debug/deno test --config /Users/runner/work/deno/deno/tests/config/deno.json --no-lock --unstable-broadcast-channel --unstable-net -A --cert=./tests/testdata/tls/RootCA.pem /Users/runner/work/deno/deno/tests/unit_node/http2_test.ts
command cwd /Users/runner/work/deno/deno
[http2_test 000.23] Download http://localhost:4260/@types%2fnode
[http2_test 000.26] Download http://localhost:4260/undici-types
[http2_test 000.26] Download http://localhost:4260/@types/node/node-22.5.4.tgz
[http2_test 000.31] Download http://localhost:4260/undici-types/undici-types-6.19.8.tgz
[http2_test 000.59] Check file:///Users/runner/work/deno/deno/tests/unit_node/http2_test.ts
[http2_test 005.82] running 11 tests from ./tests/unit_node/http2_test.ts
[http2_test 007.85] [node/http2 client] http://localhost:4246 ... ok (2s)
[http2_test 009.85] [node/http2 client] https://localhost:4247 ... ok (2s)
[http2_test 011.88] [node/http2 client createConnection] ... ok (2s)
[http2_test 012.06] [node/http2 client GET https://www.example.com]/ ... ok (188ms)
[http2_test 012.28] [node/http2.createServer()] ...
[http2_test 012.29] Uncaught error from ./tests/unit_node/http2_test.ts FAILED
[http2_test 012.29] [node/http2.createServer()] ... cancelled (0ms)
[http2_test 012.29] [node/http2 client] write image buffer on request stream works ... cancelled (0ms)
[http2_test 012.29] [node/http2 client] write 512kb buffer on request stream works ... cancelled (0ms)
[http2_test 012.29] [node/http2 client] deno doesn't panic on uppercase headers ... cancelled (0ms)
[http2_test 012.29] [node/http2 ClientHttp2Session.socket] ... cancelled (0ms)
[http2_test 012.29] [node/http2 client] connection states ... cancelled (0ms)
[http2_test 012.29] request and response exports ... cancelled (0ms)
[http2_test 012.31] 
[http2_test 012.31]  ERRORS 
[http2_test 012.31] 
[http2_test 012.31] ./tests/unit_node/http2_test.ts (uncaught error)
[http2_test 012.31] error: (in promise) Http: Http: connection error
[http2_test 012.31]     at ext:deno_http/00_serve.ts:859:15
[http2_test 012.31]     at eventLoopTick (ext:core/01_core.js:175:7)
[http2_test 012.31] This error was not caught from a test and caused the test runner to fail on the referenced module.
[http2_test 012.31] It most likely originated from a dangling promise, event/timeout handler or top-level code.
[http2_test 012.31] 
[http2_test 012.31]  FAILURES 
[http2_test 012.31] 
[http2_test 012.31] ./tests/unit_node/http2_test.ts (uncaught error)
[http2_test 012.31] 
[http2_test 012.31] FAILED | 4 passed | 8 failed (6s)
[http2_test 012.31] 
[http2_test 012.37] error: Test failed
thread 'node_unit_tests::http2_test' panicked at tests/integration/node_unit_tests.rs:192:3:
assertion `left == right` failed: Deno should have exited cleanly
  left: Some(0)
 right: Some(1)
stack backtrace:
   0:        0x10d1e7266 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hcaf66bc4c0c453df
   1:        0x10d20bccb - core::fmt::write::hc9c5f1836b413410
   2:        0x10d1e2fa2 - std::io::Write::write_fmt::h5ce5bc7686de8484
   3:        0x10d1e8aa8 - std::panicking::default_hook::{{closure}}::h52c0b2f44f6107c5
   4:        0x10d1e8628 - std::panicking::default_hook::h5a6cf31501c161b2
   5:        0x10b12306b - test::test_main::{{closure}}::h3d665f637d89df05
   6:        0x10d1e9810 - std::panicking::rust_panic_with_hook::hda4640ee332466e9
   7:        0x10d1e9095 - std::panicking::begin_panic_handler::{{closure}}::haa3060694b34ea3d
   8:        0x10d1e7749 - std::sys::backtrace::__rust_end_short_backtrace::h8eb44913cfe71457
   9:        0x10d1e8cdc - _rust_begin_unwind
  10:        0x10d23d8ea - core::panicking::panic_fmt::h31edc3d6ff0aadca
  11:        0x10d23de6b - core::panicking::assert_failed_inner::had7e28e3814f0dcd
  12:        0x10d2142a6 - core::panicking::assert_failed::hd963831ec1dee0a2
  13:        0x10b09afef - integration_tests::node_unit_tests::node_unit_test::hbd288a83c64c81f7
  14:        0x10b0a3d10 - integration_tests::node_unit_tests::http2_test::hce393a6f45d5abc7
  15:        0x10b0a3cc5 - integration_tests::node_unit_tests::http2_test::{{closure}}::h97b7d5eb0be9d000
  16:        0x10ad1ac38 - core::ops::function::FnOnce::call_once::hefbc45d22c6afc5f
  17:        0x10b12763b - test::__rust_begin_short_backtrace::h93e921f893a90bb1
  18:        0x10b126ea1 - test::run_test::{{closure}}::h42576c3f690468a6
  19:        0x10b0ebb4d - std::sys::backtrace::__rust_begin_short_backtrace::hb534ca9204c87c90
  20:        0x10b0ef352 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h95ab9f9938de870a
  21:        0x10d1eed8b - std::sys::pal::unix::thread::Thread::new::thread_start::h55ff15b5f[2276](https://github.com/denoland/deno/actions/runs/12087577936/job/33709309912?pr=27141#step:43:2277)bcd
  22:     0x7ff811f681d3 - __pthread_start


failures:
    node_unit_tests::http2_test

https://github.com/denoland/deno/actions/runs/12087577936/job/33709309912?pr=27141