linux-kernel - Re: Module loading problem since 5.3

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Message-ID: <875eecfb-618a-4989-3b9f-f8272b8d3746@gmail.com>
Date:   Fri, 11 Oct 2019 21:26:05 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: Module loading problem since 5.3

On 10.10.2019 19:15, Luis Chamberlain wrote:
> 
> 
> On Thu, Oct 10, 2019, 6:50 PM Heiner Kallweit <hkallweit1@...il.com <mailto:hkallweit1@...il.com>> wrote:
> 
>        MODULE_SOFTDEP("pre: realtek")
> 
>     Are you aware of any current issues with module loading
>     that could cause this problem?
> 
> 
> Nope. But then again I was not aware of MODULE_SOFTDEP(). I'd encourage an extension to lib/kmod.c or something similar which stress tests this. One way that comes to mind to test this is to allow a new tests case which loads two drives which co depend on each other using this macro. That'll surely blow things up fast. That is, the current kmod tests uses request_module() or get_fs_type(), you'd want a new test case with this added using then two new dummy test drivers with the macro dependency.
> 
> If you want to resolve this using a more tested path, you could have request_module() be used as that is currently tested. Perhaps a test patch for that can rule out if it's the macro magic which is the issue.
> 
>   Luis
> 
Maybe issue is related to a bug in introduction of symbol namespaces, see here:
https://lkml.org/lkml/2019/10/11/659

Heiner