Bug 111869

Summary: Navi "divide error" hang
Product: DRI Reporter: Doug Ty <git>
Component: DRM/AMDgpuAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact:
Severity: not set    
Priority: not set CC: alexandr.kara, git, popovic.marko, univerz
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
divide-error_09-20.txt
none
divide-error_09-30.txt
none
divide-error_09-30-x2.txt none

Description Doug Ty 2019-09-30 12:30:27 UTC 
Created attachment 145593 [details]
divide-error_09-20.txt

Occasionally, usually while watching videos in Firefox, my GPU will hang and the screen will freeze -- sound and keyboard input still work in the background, and I need to use REISUB hotkeys to reboot. This is separate, in addition to the sdma and ring gfx_0.0.0 hangs.

Upon rebooting, journalctl shows the attached "divide error". I've included logs from 3 instances of it happening. I'm currently using the Jul 14 firmware from Fedora's linux-firmware package as the hang appears to occur more often on the newer firmware from https://people.freedesktop.org/~agd5f/radeon_ucode/navi10/ however this may just be placebo.

It occurs with or without the "0-sized IBs" kernel patch from https://bugs.freedesktop.org/show_bug.cgi?id=111481#c33 and on both PCIe 3.0 and 4.0. I'm not using a PCIe riser and the card works without issue on Windows 10 dual boot.

CPU: 3700X
GPU: Sapphire 5700XT (reference)
Motherboard: Gigabyte X570-I (BIOS F4)
Kernel: 5.3.0
Mesa: mesa-git 1:19.3.0_devel.115682.3c966fd688c-1
LLVM: llvm-git 10.0.0_r327425.63f6066b53d-1

Please let me know if any more information would be helpful, or if there's anything I can do to troubleshoot. Thanks.
Comment 1 Doug Ty 2019-09-30 12:30:48 UTC 
Created attachment 145594 [details]
divide-error_09-30.txt
Comment 2 Doug Ty 2019-09-30 12:30:59 UTC 
Created attachment 145595 [details]
divide-error_09-30-x2.txt
Comment 3 Andrew Sheldon 2019-11-01 01:27:40 UTC 
I also get this error frequently with amd-staging-drm-next, but not with 5.4-rcX (at least I can't remember getting one with the latter).

Not sure if that suggests there is a regression, or something to do with the 5.3 kernel specifically (I don't remember having the error when amd-staging-drm-next was using 5.2 kernel).
Comment 4 Andrew Sheldon 2019-11-05 00:40:06 UTC 
I just want to add that I do still get this bug with 5.4-rcX, unfortunately. It's the only remaining non-Mesa hang that I haven't been able to workaround.
Comment 5 Martin Peres 2019-11-19 09:56:45 UTC 
-- GitLab Migration Automatic Message --

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