Problem Description:
Since I enabled permission prompting, I’ve been experiencing occasional freezes on my system when downloading files from either Vivaldi or Mattermost snaps. Sometimes they are a kernel panic, sometimes seemingly a graphical freeze only.
Relevant System Information:
```
$ uname -a
Linux rooster 7.0.0-15-generic #15-Ubuntu SMP PREEMPT_DYNAMIC Wed Apr 22 16:06:43 UTC 2026 x86_64 GNU/Linux
$ sudo lspci -k | grep -EA3 ‘VGA|3D|Display’
65:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Strix [Radeon 880M / 890M] (rev c4)
Subsystem: AIstone Global Limited Device 5006
Kernel driver in use: amdgpu
Kernel modules: amdgpu
$ snap info mattermost-desktop | grep tracking -A10
tracking: latest/stable
refresh-date: yesterday at 19:52 CEST
channels:
latest/stable: 6.2.0 2026-05-20 (841) 137MB -
latest/candidate: 6.2.0 2026-05-20 (841) 137MB -
latest/beta: ^
latest/edge: ^
installed: 6.2.0 (841) 137MB -
```
Screenshots or Error Messages:
I am not finding anything remarkable on dmesg after I reboot.
I’d love to help the team debug this issue but I need more information on what to try.
For now, I’ll try to abstain from downloading images from Mattermost, and switch to the Vivaldi .deb package, which seems to be working fine.
Hi @astrojuanlu , thanks for the report. There’s a known issue with kernels 6.17+ leading to a soft lockup when prompting is enabled and then snapd restarts.
A fix is in the works but hasn’t been released yet AFAIK.
Do you know if snapd was restarting when this occurred, such as due to a refresh? Or did the lockup occur when doing an action which triggered a prompt? If the latter, did it occur when the action was attempted or after trying to reply to the prompt?
I see. Is this also affecting 7.0? (That’s my current kernel)
Edit: I see it’s 6.17**+**
I think it’s unlikely it happened during a refresh, I experienced this 3 times this morning in various moments. It occurred right after replying to the prompt if I’m not mistaken.
Is there any way I can enable some logging that I can share the next time it happens? Maybe connect to the machine via SSH after the graphics freeze, assuming it’s not a kernel panic?
On Mattermost, download image → Show in File Manager freezes the system, and any incoming SSH sessions are interrupted (so it’s not just a graphics freeze)
Disabling Permissions Prompting and then rebooting makes the issue go away
Thanks; I should correct the earlier post slightly by saying that what is described in the above GitHub issue is what I can reproduce; i.e., it indeed drops to initramfs.
If that has a bearing on permissions prompting, it should be fixable by this stopgap workaround. You might also need the follow-up to fix-up /etc/os-release, but that seemed to be unnecessary for the Ubuntu Pro system observation issue, so may just be a placebo on top.
That comment is a month old, though, and that Ubuntu Pro issue should have been fixed by now, I reckon; can’t hurt to try, though.
Again, both of the issues I can reproduce too: having Ubuntu Pro enabled, neither disk encryption information is shown in the Security Center nor does an icon appear in the taskbar upon enabling the live-patching option and the associated GUI option. But I suppose these might only be GUI regressions from the previous LTS version, which I also have running with rather comparable hardware (cf., e.g., the disk certainly is encrypted).
