Linux

Edit: See update at end of post for more details (no solutions, but things to consider.)

As of Linux 6.7 I'm getting hard freezes that require a power cut to reset (sysrq doesn't work.) Happens at both idle and load anywhere from 5 minutes in to an hour. Running journalctl --follow and dmesg -w (both as root) reveal nothing at the time of the crash. Kernel version 6.6 continues to be 100% stable.

System:

• Distro/Kernel: Arch Linux 6.7.arch3-1
• CPU: AMD Ryzen 5 2600X
• GPU: AMD RX580 8GB via AMDGPU
• RAM: Some configuration of 16GB at 2667 MT/s.
• WM: SwayWM

I'm unsure how to go about properly reporting a bug if no errors are being generated.

Any advice?

I'm not alone on this apparently (warning, it's reddit.)

Update (01-27-2024)

I've spent the last 5 days or so bisecting the kernel from stable 6.6 to 6.7 while also touching on linux-next and 6.8rc1. I've experienced hangs on each kernel after 6.6 but under different conditions. In some cases sys-rq can rescue the system, but other times it's a hard (still errorless) crash. I believe all of these crashes can be blamed on AMDGPU given all other user reports (see: reddit thread above) mention having an AMD card.

List of similar issues

Note: Some of these are from earlier Kernel versions, but they're included since they present the same way.

• https://reddit.com/19e0y0b
• https://reddit.com/196tz6v
• https://bugzilla.kernel.org/show_bug.cgi?id=218413
• https://gitlab.freedesktop.org/drm/amd/-/issues/3124#note_2252559

Patched/Unpatched 6.8rc1 attempts

This bug report is the closest I can find on the issue. which links off to this report, which includes a patch. The patch in question is for 6.8rc1 and allows the system to stay up longer, but frequently "trips," meaning the system begins to stumble and halt for tenths of a second with accelerated video playback in my browser (qutebrowser) has to contend with load elsewhere on the system (gaming, etc.) Hangs under this patch and kernel can be rescued. However, with video acceleration disabled in the browser (and the browser not even running,) hard crashes can still occur. So either there's two new issues being brought into the fold (one to do with video accel. and the original issue mentioned in this post), or the original issue is just manifesting in different ways.

Bisecting 6.6 to 6.7

This process was taking forever because there's no reproducible situation in which the system halts. My method was to build the kernel (8 minutes) then reboot and let the system idle on a Sway session while I'm off doing something else (2 to 4 hours.) If I come back to a hard lock, then I mark the version as failed and repeat. This method let me try 2 versions of the kernel a day, not nearly enough to have this fixed quickly or easily. Due to the amount of time it takes to detect a crash, it's also possible to mark a bad commit as good (meaning it didn't crash in 2 hours, but would have in 4 or 5, etc.) I won't be continuing this.

The state of AMDGPU in general

It seems I'm lucky to have not had these issues before. A little bit of time reading issues like this show that people have been encountering problems for a while now (pre-kernel 6.7.) There are issues that have been open for years that still appear to be problems on modern systems and hardware. I'm not passing blame to anyone here, just stating that it's a miracle any of this stuff works at all given how complex the hardware is that even those who appear to be spending huge amounts of time dealing directly with it can't properly untangle what causes these faults.