(Instance of #2855) Flaky test: SHELLEY_CLI_WALLETS, WALLETS_CREATE_04 - fd:146: hFlush: resource vanished (Broken pipe)

[piotr-iohk]

Context

https://buildkite.com/input-output-hk/cardano-wallet/builds/15401#6bd555ea-a279-464a-9097-7c57af05b7fc

Test Case

SHELLEY_CLI_WALLETS, WALLETS_CREATE_04 - Wallet names invalid, name is too short: expected at least 1 character

Failure / Counter-example

cardano-wallet                 > Failures:
--
  | cardano-wallet                 >
  | cardano-wallet                 >   src/Test/Integration/Scenario/CLI/Shelley/Wallets.hs:285:56:
  | cardano-wallet                 >   1) CLI Specifications, SHELLEY_CLI_WALLETS, WALLETS_CREATE_04 - Wallet names invalid, name is too short: expected at least 1 character
  | cardano-wallet                 >        uncaught exception: IOException of type ResourceVanished
  | cardano-wallet                 >        fd:146: hFlush: resource vanished (Broken pipe)
  | cardano-wallet                 >
  | cardano-wallet                 >   To rerun use: --match "/CLI Specifications/SHELLEY_CLI_WALLETS/WALLETS_CREATE_04 - Wallet names invalid/name is too short: expected at least 1 character/"
  | cardano-wallet                 >
  | cardano-wallet                 > Randomized with seed 1377329000
  | cardano-wallet                 >
  | cardano-wallet                 > Finished in 907.3185 seconds, used 996.7970 seconds of CPU time
  | cardano-wallet                 > 836 examples, 1 failure, 21 pending

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Resolution

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QA

[Anviking]

From https://stackoverflow.com/questions/34002720/why-am-i-getting-hputchar-resource-vanished-errors-from-simple-haskell-networ:

This basically means that your server closes the connection without completing the exchange; this should not be intended behavior. The wiki page you linked to says about this code: «Relies on the runtime scheduler to wake up the main thread in a timely fashion». Maybe this is not always happening

So sounds like the load is too high, just like in #2428, and #2854 should hopefully help.

[Anviking]

Tracking as #2855