vibe.core 1429: Timeout occurred too late

[wilzbach]

+ echo '[INFO] Running test vibe.core.net.1429'
[INFO] Running test vibe.core.net.1429
+ cd tests/vibe.core.net.1429
+ dub --compiler=dmd --override-config=vibe-d:core/vibe-core --build-mode=separate
Performing "debug" build using dmd for x86_64.
taggedalgebraic 0.10.9: target for configuration "library" is up to date.
eventcore 0.8.27: target for configuration "epoll" is up to date.
stdx-allocator 2.77.0: target for configuration "library" is up to date.
vibe-core 1.4.0-alpha.1: target for configuration "epoll" is up to date.
vibe-d:utils 0.8.3-alpha.3: target for configuration "library" is up to date.
vibe-d:data 0.8.3-alpha.3: target for configuration "library" is up to date.
tests ~master: building configuration "application"...
../../../../.dub/packages/vibe-core-1.4.0-alpha.1/vibe-core/source/vibe/core/log.d(613,21): Deprecation: Built-in hex string literals are deprecated, use `std.conv.hexString` instead.
Linking...
To force a rebuild of up-to-date targets, run again with --force.
Running ./tests 
[main(fz4O) INF] Exception received: Receive timeout.
core.exception.AssertError@source/app.d(24): Timeout occurred too late (2 secs, 817 ms, 361 μs, and 4 hnsecs).
----------------
??:? _d_assert_msg [0x60b40e]
source/app.d:24 @safe void app._sharedStaticCtor1().__lambda2() [0x57e56e]
../../../../.dub/packages/vibe-core-1.4.0-alpha.1/vibe-core/source/vibe/core/task.d:552 void vibe.core.task.TaskFuncInfo.set!(void function() @safe*).set(ref void function() @safe*).callDelegate(ref vibe.core.task.TaskFuncInfo) [0x588292]
../../../../.dub/packages/vibe-core-1.4.0-alpha.1/vibe-core/source/vibe/core/task.d:573 void vibe.core.task.TaskFuncInfo.call() [0x5a5625]
../../../../.dub/packages/vibe-core-1.4.0-alpha.1/vibe-core/source/vibe/core/task.d:386 nothrow void vibe.core.task.TaskFiber.run() [0x5a4c3d]
??:? void core.thread.Fiber.run() [0x63973b]
??:? fiber_entryPoint [0x63960a]
??:? [0xffffffff]
Program exited with code -6

Seen here: https://ci.dlang.io/blue/organizations/jenkins/dlang-org%2Fphobos/detail/PR-6041/6/pipeline