linux-kernel - Re: [PATCH v2] module: Don't wait for GOING modules

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Date:   Sat, 11 Mar 2023 22:25:05 -0800
From:   Lucas De Marchi <lucas.demarchi@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
CC:     Petr Mladek <pmladek@...e.com>, Petr Pavlu <petr.pavlu@...e.com>,
        "Prarit Bhargava" <prarit@...hat.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Borislav Petkov <bp@...en8.de>, NeilBrown <neilb@...e.de>,
        Goldwyn Rodrigues <rgoldwyn@...e.com>, <david@...hat.com>,
        <mwilck@...e.com>, <linux-modules@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        "Ben Hutchings" <benh@...ian.org>,
        Adam Manzanares <a.manzanares@...sung.com>
Subject: Re: [PATCH v2] module: Don't wait for GOING modules

On Sat, Jan 21, 2023 at 02:40:20PM -0800, Luis Chamberlain wrote:
>On Thu, Jan 19, 2023 at 04:58:53PM -0800, Luis Chamberlain wrote:
>> On Thu, Jan 19, 2023 at 04:51:27PM -0800, Luis Chamberlain wrote:
>> > On Thu, Jan 19, 2023 at 04:47:05PM +0100, Petr Mladek wrote:
>> > > Yes, the -EINVAL error is strange. It is returned also in
>> > > kernel/module/main.c on few locations. But neither of them
>> > > looks like a good candidate.
>> >
>> > OK I updated to next-20230119 and I don't see the issue now.
>> > Odd. It could have been an issue with next-20221207 which I was
>> > on before.
>> >
>> > I'll run some more test and if nothing fails I'll send the fix
>> > to Linux for rc5.
>>
>> Jeesh it just occured to me the difference, which I'll have to
>> test next, for next-20221207 I had enabled module compression
>> on kdevops with zstd.
>>
>> You can see the issues on kdevops git log with that... and I finally
>> disabled it and the kmod test issue is gone. So it could be that
>> but I just am ending my day so will check tomorrow if that was it.
>> But if someone else beats me then great.
>>
>> With kdevops it should be a matter of just enabling zstd as I
>> just bumped support for next-20230119 and that has module decompression
>> disabled.
>
>So indeed, my suspcions were correct. There is one bug with
>compression on debian:
>
> - gzip compressed modules don't end up in the initramfs
>
>There is a generic upstream kmod bug:
>
>  - modprobe --show-depends won't grok compressed modules so initramfs
>    tools that use this as Debian likely are not getting module dependencies
>    installed in their initramfs

are you sure you have the relevant compression setting enabled
in kmod?

$ kmod --version
kmod version 30
+ZSTD +XZ +ZLIB +LIBCRYPTO -EXPERIMENTAL
$ modprobe --show-depends ext4
insmod /lib/modules/6.1.12-1-MANJARO/kernel/fs/jbd2/jbd2.ko.zst 
insmod /lib/modules/6.1.12-1-MANJARO/kernel/fs/mbcache.ko.zst 
insmod /lib/modules/6.1.12-1-MANJARO/kernel/lib/crc16.ko.zst 
insmod /lib/modules/6.1.12-1-MANJARO/kernel/arch/x86/crypto/crc32c-intel.ko.zst 
insmod /lib/modules/6.1.12-1-MANJARO/kernel/crypto/crc32c_generic.ko.zst 
insmod /lib/modules/6.1.12-1-MANJARO/kernel/fs/ext4/ext4.ko.zst 

Lucas De Marchi