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Re: [Qemu-devel] [PATCH v2 4/5] iotests: Make 083 less flaky

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v2 4/5] iotests: Make 083 less flaky
Date: Thu, 9 Nov 2017 14:58:07 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/09/2017 02:30 PM, Max Reitz wrote:
> 083 has (at least) two issues:
> 1. By launching the nbd-fault-injector in background, it may not be
>    scheduled until the first grep on its output file is executed.
>    However, until then, that file may not have been created yet -- so it
>    either does not exist yet (thus making the grep emit an error), or it
>    does exist but contains stale data (thus making the rest of the test
>    case work connect to a wrong address).
>    Fix this by explicitly overwriting the output file before executing
>    nbd-fault-injector.
> 2. The nbd-fault-injector prints things other than "Listening on...".
>    It also prints a "Closing connection" message from time to time.  We
>    currently invoke sed on the whole file in the hope of it only
>    containing the "Listening on..." line yet.  That hope is sometimes
>    shattered by the brutal reality of race conditions, so invoke grep
>    before sed.

Comment is now stale; s/invoke grep before sed/make the sed script more

Reviewed-by: Eric Blake <address@hidden>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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