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Date:   Sun, 27 Dec 2020 12:00:19 -0800
From:   Brendan Higgins <>
To:     David Gow <>
Cc:     Petr Mladek <>,
        Shuah Khan <>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        KUnit Development <>,
        Linux Kernel Mailing List <>,
        Andy Shevchenko <>
Subject: Re: [PATCH] kunit: tool: Force the use of the 'tty' console for UML

On Mon, Dec 21, 2020 at 11:39 PM David Gow <> wrote:
> kunit_tool relies on the UML console outputting printk() output to the
> tty in order to get results. Since the default console driver could
> change, pass 'console=tty' to the kernel.
> This is triggered by a change[1] to use ttynull as a fallback console
> driver which -- by chance or by design -- seems to have changed the
> default console output on UML, breaking kunit_tool. While this may be
> fixed, we should be less fragile to such changes in the default.
> [1]:
> Signed-off-by: David Gow <>
> Fixes: 757055ae8ded ("init/console: Use ttynull as a fallback when there is no console")

Acked-by: Brendan Higgins <>

Thanks for taking care of this!

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