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

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Date:   Thu, 23 Mar 2023 08:01:25 -0700
From:   Lucas De Marchi <lucas.demarchi@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
CC:     Vincenzo Palazzo <vincenzopalazzodev@...il.com>,
        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 Wed, Mar 22, 2023 at 03:31:59PM -0700, Luis Chamberlain wrote:
>On Sat, Mar 11, 2023 at 10:25:05PM -0800, Lucas De Marchi wrote:
>> 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
>
>Debian has:
>
>kmod version 30
>+ZSTD +XZ -ZLIB +LIBCRYPTO -EXPERIMENTAL

	   ^ so... mind the minus :). It doesn't support zlib.

Change your kernel config to either compress the modules as xz or zstd.


Lucas De Marchi

>
>> $ 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
>
>Perhaps this was related to the above gzip issue in debian then.
>
>I'm hoping will have a bit more time than me to verify.
>
>  Luis