On Wed, Apr 25, 2018 at 10:05:23PM +0200, François Valenduc wrote: > > > Le 24/04/18 à 22:25, Theodore Y. Ts'o a écrit : > > On Tue, Apr 24, 2018 at 08:17:23PM +0200, François 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? thanks, greg k-h