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grant123
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 Posted: Thu Apr 22, 2021 6:51 pm Post subject: Fixing a kernel panic |
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I'm using a Gigabyte Brix 2807 and it works perfectly except for compatibility with a particular USB sound card. I've read that Arch Linux does work with this sound card so I thought I would try the Arch kernel config on gentoo-sources to see if the sound card problem is a kernel config issue. I copied the Arch config in and compiled and installed the kernel but it panics right away when it tries to boot. I've compared the booting config to the non-booting Arch config and I don't see the issue.
Any ideas on narrowing down the cause of the kernel panic? |
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alamahant
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| Posted: Thu Apr 22, 2021 7:29 pm Post subject: |
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In kernel config
| Code: |
CONFIG_MODULE_COMPRESS=n
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and recompile...
Since you will be recompiling a big kernel throw this also in the mix
| Code: |
CONFIG_DEBUG_INFO=n
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It will save you from a 12 gigs kernel tree and a big directory in /lib/modules
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grant123
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| Posted: Thu Apr 22, 2021 7:32 pm Post subject: |
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| Thank you. Recompiling now and will report back. |
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grant123
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| Posted: Thu Apr 22, 2021 8:54 pm Post subject: |
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It still panics right away. Here are the first three lines of output:
x86/cpu: VMX (outside TXT) disabled by BIOS
ehci-pci port 1 reset error
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block |
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alamahant
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| Posted: Thu Apr 22, 2021 9:07 pm Post subject: |
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Did you "make install" and update grub?
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grant123
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| Posted: Thu Apr 22, 2021 9:28 pm Post subject: |
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| Yep I always 'make && make modules_install' and I copied it over the previous non-booting kernel in /boot so nothing to update in grub this time. |
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alamahant
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| Posted: Thu Apr 22, 2021 9:39 pm Post subject: |
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Then iyou should check default-grub and fstab..You can not not boot with a full kernel compiled...
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grant123
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| Posted: Thu Apr 22, 2021 9:48 pm Post subject: |
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Do you mean /etc/default/grub? That file is essentially empty here.
I haven't touched fstab and it does boot fine with the kernel config I normally use. /boot is on /dev/sda1. Is there a kernel config that would change that to something else? |
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alamahant
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| Posted: Thu Apr 22, 2021 10:06 pm Post subject: |
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Are you trying to boot from a usb disk?
This looks worrisome
| Code: |
ehci-pci port 1 reset error
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Do you have multiple disks?
Is it uefi?
degault-grub should not be empty.
It should contain at least somethong like "root=<> rootfstype=<>" in linux line.
Do you use an initrd?
Can you post the output of /boot/grub/grub.cfg and fstab?
But if you were booting before but not now with a full .config something strange is going on...
Probably some error in building and installing the kernel...
Did you run
make clean
make mrproper
before recompiling?
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Buffoon
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| Posted: Thu Apr 22, 2021 10:21 pm Post subject: |
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| Quote: | | Unable to mount root fs on unknown-block ... |
Vital information is missing here, this is kernel telling you why it cannot boot, (0,0) would mean HDD controller has no driver for instance. This Arch kernel business does not make much sense, why don't you boot from some CD, Arch will do well, and look what driver is loaded for your sound codec chip, and then enable it in your kernel.
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grant123
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| Posted: Thu Apr 22, 2021 10:32 pm Post subject: |
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| alamahant wrote: | | Are you trying to boot from a usb disk? |
No.
| alamahant wrote: | This looks worrisome
| Code: |
ehci-pci port 1 reset error
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A search turned up that this could be due to a BIOS option but it shouldn't interrupt booting.
| alamahant wrote: | | Do you have multiple disks? |
1 disk only.
| alamahant wrote: | | Is it uefi? |
No.
| alamahant wrote: | degault-grub should not be empty.
It should contain at least somethong like "root=<> rootfstype=<>" in linux line. |
I think we're talking about different files. Which file are you referring to specifically?
| alamahant wrote: | | Do you use an initrd? |
No.
| alamahant wrote: | Can you post the output of /boot/grub/grub.cfg and fstab?
But if you were booting before but not now with a full .config something strange is going on... |
Exactly.
| alamahant wrote: | Probably some error in building and installing the kernel...
Did you run
make clean
make mrproper
before recompiling? |
No but I'll try that now. |
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grant123
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| Posted: Thu Apr 22, 2021 10:37 pm Post subject: |
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| Buffoon wrote: | | Quote: | | Unable to mount root fs on unknown-block ... |
Vital information is missing here, this is kernel telling you why it cannot boot, (0,0) would mean HDD controller has no driver for instance. |
Ah it says "Unable to mount root fs on unknown-block(8,2)" which can't be right. Is that defined in the kernel somewhere?
| Buffoon wrote: | | This Arch kernel business does not make much sense, why don't you boot from some CD, Arch will do well, and look what driver is loaded for your sound codec chip, and then enable it in your kernel. |
I have the correct driver so hoping the problem is another kernel config option:
https://forums.gentoo.org/viewtopic-t-1134018-highlight-.html
FWIW this is the Arch kernel config I'm using:
https://raw.githubusercontent.com/archlinux/svntogit-packages/packages/linux/trunk/config |
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NeddySeagoon
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| Posted: Thu Apr 22, 2021 11:02 pm Post subject: |
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grant123,
unknown-block(8,2) means /dev/sda2
The kernel can see /dev/sda2 but cannot mount it.
Either the filesystem is not available in the kernel or /dev/sda2 is the wrong thing to try to mount.
Above that unknown-block(8,2) message should be a list of filesystems that the kernel tried.
All the filesystems are configured as modules. You will need a matching initrd to make that work.
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grant123
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| Posted: Thu Apr 22, 2021 11:36 pm Post subject: |
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| Ok I'll try building ext4 into the kernel instead of as a module. |
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grant123
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alamahant
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| Posted: Mon Apr 26, 2021 11:29 pm Post subject: |
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Since yiy are using arch kernel .config you must have something like these
| Code: |
CONFIG_SND_USB=y
CONFIG_SND_USB_AUDIO=m
CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER=y
CONFIG_SND_USB_UA101=m
CONFIG_SND_USB_USX2Y=m
CONFIG_SND_USB_CAIAQ=m
CONFIG_SND_USB_CAIAQ_INPUT=y
CONFIG_SND_USB_US122L=m
CONFIG_SND_USB_6FIRE=m
CONFIG_SND_USB_HIFACE=m
CONFIG_SND_USB_LINE6=m
CONFIG_SND_USB_POD=m
CONFIG_SND_USB_PODHD=m
CONFIG_SND_USB_TONEPORT=m
CONFIG_SND_USB_VARIAX=m
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no?
but since no initrd then maybe turn the appropriate ones to "y"
EDIT:not needed in built since not required for booting.My bad.sorry......
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Last edited by alamahant on Tue Apr 27, 2021 4:03 pm; edited 1 time in total |
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grant123
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| Posted: Tue Apr 27, 2021 1:40 pm Post subject: |
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I've just switched all of those to y and will report back once it's compiled.
I will say that it does seem to pick up the correct driver and everything seems fine except no sound. I'm supposed to unmute it before it will work but alsamixer reports no controls which I'm guessing is the root of the problem. The only indication that there's a problem besides no sound is "config 0 descriptor??" in dmesg.
# dmesg
...
usb 1-2: new high-speed USB device number 14 using xhci_hcd
usb 1-2: device descriptor read/64, error -71
usb 1-2: New USB device found, idVendor=249c, idProduct=9006, bcdDevice= 0.01
usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-2: Product: Computer Audio Design
usb 1-2: Manufacturer: Computer Audio Design
usb 1-2: config 0 descriptor??
# lsusb
...
Bus 001 Device 012: ID 249c:9006 M2Tech s.r.l. Computer Audio Design
...
# cat /proc/asound/cards
...
1 [CAD ]: snd-usb-hiface - CAD
CAD at usb-0000:00:14.0-2
The weird thing is it works in Linux-based OSes like max2play.com. Not sure how to narrow that down. |
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alamahant
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| Posted: Tue Apr 27, 2021 3:43 pm Post subject: |
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Maybe for testing purposes try with pulseaudio and pavucontrol.
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NeddySeagoon
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| Posted: Tue Apr 27, 2021 3:52 pm Post subject: |
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grant123,
The kernel should auto load the module when it spots that the device is connected.
Unplug the device. Wait 10 sec then plug it in.
Does hiface appear in lsmod?
Look at the end of dmesg. It should tell all about what happened when the device was connected. Post that here.
-- edit --
| Code: | | /usr/src/linux $ grep -R 9006 ./ |
includes
| Code: | | ./sound/usb/hiface/chip.c: USB_DEVICE(0x249c, 0x9006) |
in the output, so the kernel knows about your device.
The kernel says ...
| Code: | config SND_USB_HIFACE
tristate "M2Tech hiFace USB-SPDIF driver"
select SND_PCM
help
Select this option to include support for M2Tech hiFace USB-SPDIF
interface.
This driver supports the original M2Tech hiFace and some other
compatible devices. The supported products are:
* M2Tech Young
* M2Tech hiFace
* M2Tech North Star
* M2Tech W4S Young
* M2Tech Corrson
* M2Tech AUDIA
* M2Tech SL Audio
* M2Tech Empirical
* M2Tech Rockna
* M2Tech Pathos
* M2Tech Metronome
* M2Tech CAD
* M2Tech Audio Esclusive
* M2Tech Rotel
* M2Tech Eeaudio
* The Chord Company CHORD
* AVA Group A/S Vitus
To compile this driver as a module, choose M here: the module
will be called snd-usb-hiface.
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If it all works, you will have an extra sound card in /proc/asound/devices which will not be the default sound card, so alsa will need some canfiguration so that everything just works.
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those that do backups
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Last edited by NeddySeagoon on Tue Apr 27, 2021 4:10 pm; edited 1 time in total |
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alamahant
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| Posted: Tue Apr 27, 2021 4:01 pm Post subject: |
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Actually the above configs can be as modules.Not necessary to build them into the kernel,since you do not need them for booting.So please forgive my mistake.
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grant123
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| Posted: Tue Apr 27, 2021 5:10 pm Post subject: |
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Here's what I get:
| Code: | # dmesg
...
[ 147.871135] usb 2-4: USB disconnect, device number 3
[ 159.932918] usb 2-4: new high-speed USB device number 4 using xhci_hcd
[ 160.073694] usb 2-4: New USB device found, idVendor=249c, idProduct=9006, bcdDevice= 0.01
[ 160.073714] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 160.073726] usb 2-4: Product: Computer Audio Design
[ 160.073738] usb 2-4: Manufacturer: Computer Audio Design
[ 160.074232] usb 2-4: config 0 descriptor?? |
| Code: | # lsmod | grep hiface
snd_usb_hiface 28672 0
snd_pcm 147456 2 snd_usb_hiface,snd_hdmi_lpe_audio
snd 114688 4 snd_usb_hiface,snd_timer,snd_hdmi_lpe_audio,snd_pcm |
| Code: | # cat /proc/asound/devices
2: [ 0- 0]: digital audio playback
3: [ 0- 1]: digital audio playback
4: [ 0] : control
5: [ 1- 0]: digital audio playback
6: [ 1] : control
33: : timer |
I've changed mpd from device "hw:0,0" to "hw:1,0" but the behavior is the same as with my regular (non-Arch) kernel config which only includes support for the single USB sound card. mpd thinks it's playing and the progress bar proceeds across the screen as if it were playing but there is no sound as if it were muted. |
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grant123
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| Posted: Wed Apr 28, 2021 12:35 pm Post subject: |
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| Time for giving up? |
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NeddySeagoon
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| Posted: Wed Apr 28, 2021 1:17 pm Post subject: |
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grant123,
I don't know what that means.
If it works in linux anywhere it can be made to work in Gentoo to. We just don't know how yet
Some things to try. Sound devices are usually USB1 or USB2. USB2 to USB1 backward compatibility is a mess, it was added in a limited way as an afterthought, so its hardware dependend. USB3 backward compatibility wan designed in from the outset but its not 100% either.
Connect your device, and any other devices that you want to connect at the same time. Wait 10 sec for the USB to settle.
Now put onto a pastebin. You need to run lsusb there as root or some information will not appear.
Also pastebin your entire kernel .config file.
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grant123
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| Posted: Wed Apr 28, 2021 5:20 pm Post subject: |
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After changing the above kernel options to Y from M the behavior is a little different. Now nothing happens when I click the play button for mpd instead of it thinking it's playing. Changing the default sound card in /etc/asound.conf as follows also causes youtube.com to hang when it tries to play something:
| Code: | pcm.!default {
type hw
card 1
device 0
} |
I'm going to remove support for the PCI sound card from the kernel so that the USB sound card is the only one detected to avoid confusion. In the meantime here is the info requested:
lsusb:
https://pastebin.ubuntu.com/p/2ncs8TJ7Vh/
.config:
https://pastebin.ubuntu.com/p/7mCVkDrWyK/
Let me know if anything else would be helpful. |
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grant123
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| Posted: Wed Apr 28, 2021 6:13 pm Post subject: |
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| The USB sound card is the only one detected by the system now but still no sound from mpd or youtube via "hw:0,0". |
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Kernel & Hardware
