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VinzC
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Joined: 17 Apr 2004
Posts: 5098
Location: Dark side of the mood
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 Posted: Tue Aug 21, 2018 8:41 am Post subject: [SOLVED] mount root on LVM "no such file or directory&q |
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Hi.
I've just finished upgrading my laptop and it went well, at least I can boot it with kernel 4.9.75. But when I boot with kernel 4.14.63-r1, I'm gratified with an error message from the initramfs such as this:
| Code: | mount -t ext4 -o ro,relatime,data=ordered /dev/dm-0 /newroot
mount: mounting /dev/dm-0 on /newroot failed: No such file or directory |
But - *all* of the logical volumes were detected (6 actually);
- directory /newroot exists — it's from the initramfs!
- /dev/dm-0 exists and is the root filesystem.
Now I'm stuck and I don't know what to check.
Note that - I have (as you guessed) my root filesystem on LVM2;
- I generate my initramfs with genkernel initramfs --lvm;
- after the upgrade I rejuvenated the initramfs for kernel 4.9.75 and it works fine;
- I'm not using systemd but openrc;
- I'm not using Grub but extlinux (don't know why it should matter but for completeness' sake);
- the root filesystem is passed to the kernel as root=UUID=xxx and it's OK since the initramfs successfully translated that into /dev/dm-0;
- lvm2 is not compiled with static-libs but it seems no longer seems to matter with kernel 4.9 lineage at least, so I guess...
- I tried running the mount instruction manually in rescue mode (typed "shell" when prompted from the initramfs) and even that fails (
 WTF?!?)
- I ran blkid /dev/dm-0 from safe mode and it returned the root file system's label and UUID so it looks like only the mount operation is the root cause...
A little help would be appreciated as I don't remember having ever run into this kind of trouble  .
Thanks a whole lot in advance.
_________________
Gentoo addict: tomorrow I quit, I promise!... Just one more emerge...
1739!
Last edited by VinzC on Tue Aug 21, 2018 6:32 pm; edited 1 time in total |
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VinzC
Watchman
Joined: 17 Apr 2004
Posts: 5098
Location: Dark side of the mood
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| Posted: Tue Aug 21, 2018 6:30 pm Post subject: |
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Turned out to be a missing module *facepalm*. I peeked at dmesg and I saw the following error message (approximately)
| Code: | | modprobe: could not load crc32c |
So I compiled my kernel again and moved CRC32C into the kernel, rebooted and... voilààààà!
Under the hood: I had that module compiled as an external module. However it looks like genkernel misses that essential component (with kernel 4.14 at least) when building the initramfs. Flipping the {M} into a {*} in menuconfig did the job:
| Code: | Library routines --->
-*- CRC32/CRC32c functions
{*} CRC32c (Castagnoli, et al) Cyclic Redundancy-Check <-- that one is required to boot with an initramfs! |
Case closed.
_________________
Gentoo addict: tomorrow I quit, I promise!... Just one more emerge...
1739! |
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