Hello,

> So I am also guessing that 5.13-rc6 fails in this same way?
I took the time to compile and test the 5.13-rc6 version: it has the 
same issue (complete freeze with sound looping forever until I manually 
switch off the computer with the hardware button on the case). Please 
find attached the kernel journal for that specific boot, called 
`journaloutput-513r6`

> And you do have this specific hardware, for this specific patch, right?
Yes, I have a Realtek ALC1220 codec in my motherboard, currently on 
5.12.8, I have the following modules running:

$ lsmod | grep snd
snd_usb_audio         331776  2
snd_usbmidi_lib        45056  1 snd_usb_audio
snd_rawmidi            40960  1 snd_usbmidi_lib
snd_hda_codec_realtek   159744  1
snd_hda_codec_generic    94208  1 snd_hda_codec_realtek
ledtrig_audio          16384  1 snd_hda_codec_generic
snd_hda_codec_hdmi     73728  1
snd_hda_intel          57344  4
snd_intel_dspcfg       20480  1 snd_hda_intel
snd_hda_codec         163840  4 
snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hwdep              16384  2 snd_usb_audio,snd_hda_codec
snd_hda_core          106496  5 
snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_pcm               114688  5 
snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core
snd_timer              40960  1 snd_pcm
snd


I found it intriguing that I am the first person to report this issue, 
maybe because of my specific hardware interaction and use-case, some 
additional information:
- I use the line-out rear port of my motherboard to connect to a 
home-cinema through a 3.5mm jack cable. To trigger the issue, I am 
playing the same video on MPV (a video player) with sound output to the 
home-cinema (therefore using the realtek soundcard). The freeze usually 
gets triggered at a random time within the 20mins the video takes. The 
freeze does happen without using MPV though, sometimes system sounds 
(like pressing backspace on an empty field) trigger it too.

- Motherboard: MSI MPG X570 GAMING PRO CARBON WIFI, BIOS 7B93v1C, with 
AMD ComboAM4PIV2 1.2.0.2. More information in ref [1]
- External USB sound card running at the same time: SteelSeries GameDAC 
[2] (I decide to redirect sound output in a per-app basis with 
pulseaudio and pavucontrol)
- My GPU supports audio through HDMI but my monitor is connected through 
DP and does not have speakers.
- CPU: Ryzen 5950X
- GPU: 5700XT

I am wondering how can ALSA affect the kernel up to the point that it 
can't write things to the journal. Is it something worse than a "kernel 
panic" (that I have never encountered before) ?

> Thanks for testing!

I am really happy to finally be able to contribute! Thank you for 
sparing some time for this issue.

Please feel free to ask anything so we can progress further on the 
issue, I will be awaiting instructions.

Kind regards,

Adel K.S.

[1] 
https://www.msi.com/Motherboard/MPG-X570-GAMING-PRO-CARBON-WIFI/Specification
[2] https://steelseries.com/gaming-accessories/gamedac