linux-kernel - Re: [PATCH 3/4] common/module: add a patient module rmmod

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Message-ID: <YQNGWqqIHKNRugcE@bombadil.infradead.org>
Date:   Thu, 29 Jul 2021 17:22:50 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     fstests@...r.kernel.org
Cc:     hare@...e.de, dgilbert@...erlog.com, jeyu@...nel.org,
        lucas.demarchi@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] common/module: add a patient module rmmod

On Tue, Jul 27, 2021 at 01:10:44PM -0700, Luis Chamberlain wrote:
> Furthermore... experience on older kernels shows it may be a while
> before we can actually remove the module even *after*
> /sys/module/$module/refcnt is 0. This is only currently observed
> on older kernels.

Sadly this is incorrect, after running a test without any sleep
once refcnt is 0 also fails on linux-next, just that the failure rate
is much lower, at about ~ 1/1642.

So the sleep is still relevant even if testing with linux-next.

  Luis