Re: [Regression] CPU stalls and eventually causes a complete system freeze with 6.0.3 due to "video/aperture: Disable and unregister sysfb devices via aperture helpers"

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Hi

Am 25.10.22 um 10:45 schrieb Andreas Thalhammer:
[...]
Yeah, it's also part of a larger changeset. But I wouldn't want to
backport all those changes either.

Attached is a simple patch for linux-stable that adds the necessary fix.
If this still doesn't work, we should probably revert the problematic
patch.

Please test the patch and let me know if it works.


Yes, this fixed the problem. I'm running 6.0.3 with your patch now, all
fine.

Thanks a lot for testing. If Greg doesn't already pick up the patch from this discussion, I'll send it to stable soonish; adding your Tested-by tag.

Best regards
Thomas


Thanks!
Andreas


Best regards
Thomas


I don't use git and I don't know how to /cherry-pick commit/
9d69ef183815, but I found the patch here:
https://patchwork.freedesktop.org/patch/494609/

I hope that's the right one. I reintegrated
v2-07-11-video-aperture-Disable-and-unregister-sysfb-devices-via-aperture-helpers.patch
and also applied
v2-04-11-fbdev-core-Remove-remove_conflicting_pci_framebuffers.patch,
did a "make mrproper" and thereafter compiled a clean new 6.0.3 kernel
(same .config).

Now the system doesn't even boot to a console. The first boot got me to
a rcu_shed stall on CPUs/tasks, same as above, but this time with:
Workqueue: btrfs-cache btrfs_work_helper

I booted a second time with the same kernel, and it got stuck after
mounting the root btrfs filesystem (what looked like a total freeze, but
when it didn't show a rcu_stall message after ~2 min I got impatient and
wanted to see if I had just busted my root filesystem...)

I booted 6.0.2 and everything is fine. (I'm very glad! I definitely
should update my backup right away!)

I will try 6.1-rc1 next, bear with...




--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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