Error message comes up upon shutting down the client.

[adilimroz]

• Parity Ethereum version: 2.5.9 and other recent releases
• Operating system: Windows / MacOS / Linux
• Installation: built from source

Steps to reproduce

1. Try shutting down a running parity-ethereum client with Ctrl+C keyboard combination.
   Observe that the client shuts down but with a message
   "unable to get mut ref for engine for shutdown"

[dvdplm]

Probably over-zealous logging.

I suspect this is fixed on master or not shown in all modes of operation. @adilimroz do you see this even when just starting parity with default params? Or just when e.g. import/exporting blocks?

[adilimroz]

@dvdplm It occurs while running the client in all possible configuration.

[niklasad1]

@adilimroz this should be fixed by #10691 and #10683

You can try https://github.com/paritytech/parity-ethereum/tree/v2.5.10-stable to verify

[adilimroz]

Thanks @niklasad1 . Verified in master as well.