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Date: Thu, 26 Apr 2018 08:35:35 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: =?iso-8859-1?Q?Fran=E7ois?= Valenduc <francoisvalenduc@gmail.com>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>, stable@vger.kernel.org
Subject: Re: Linux 4.14.36
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On Thu, Apr 26, 2018 at 07:44:40AM +0200, Greg KH wrote:
> On Wed, Apr 25, 2018 at 10:05:23PM +0200, Fran�ois Valenduc wrote:
> > 
> > 
> > Le 24/04/18 � 22:25, Theodore Y. Ts'o a �crit�:
> > > On Tue, Apr 24, 2018 at 08:17:23PM +0200, Fran�ois Valenduc wrote:
> > >> I am using gentoo and indeed, the crc32_generic� module was not included
> > >> in the initramfs by default. I have added it and now I can use the
> > >> 4.14.36 kernel without having to revert this commit.
> > > So Gentoo doesn't automatically figure out which modules are required
> > > based on module depndencies (e.g., from the modules.dep file)?
> > >
> > > That seems like a... bug.  If this is a problem which is widespread
> > > across distributions, then we might have many more users running into
> > > this when 4.17 and the latest stable kernels get rolled out.
> > >
> > >      	       	       	      	     	     - Ted
> > I think that gentoo take into account modules dependencies. For example,
> > jbd2 is included automatically in the initramfs without having to
> > specifially include via the modules_load file of the genkernel package:
> > 
> > grep jbd2 /usr/share/genkernel/arch/x86_64/modules_load
> > zsh: exit 1���� grep --colour=auto jbd2
> > /usr/share/genkernel/arch/x86_64/modules_load
> > 
> > and jbd2 is also specified as a dependency for ext4 in the modules.dep file:
> > 
> > grep jbd2 modules.dep���������������������������������
> > kernel/fs/ext4/ext4.ko: kernel/fs/mbcache.ko kernel/fs/jbd2/jbd2.ko
> > kernel/fs/jbd2/jbd2.ko:
> > 
> > but the crc32_generic module is not listed as a dependency for ext4:
> > 
> > �grep crc32 modules.dep��������������������������������
> > kernel/crypto/crc32c_generic.ko:
> > kernel/drivers/md/persistent-data/dm-persistent-data.ko:
> > kernel/lib/libcrc32c.ko kernel/drivers/md/dm-bufio.ko
> > kernel/drivers/md/dm-mod.ko kernel/drivers/dax/dax.ko
> > kernel/drivers/md/dm-thin-pool.ko:
> > kernel/drivers/md/persistent-data/dm-persistent-data.ko
> > kernel/lib/libcrc32c.ko kernel/drivers/md/dm-bio-prison.ko
> > kernel/drivers/md/dm-bufio.ko kernel/drivers/md/dm-mod.ko
> > kernel/drivers/dax/dax.ko
> > kernel/lib/libcrc32c.ko:
> > 
> > So, would this be the cause of the problem ?
> 
> It's a dependancy of the core kernel, the random code, not ext4.  What
> tool are you using for your initramfs, dracut or something else?

Oh nevermind, that's what I get for mixing up problems and writing
emails before coffee...