linux-kernel - what to do on magically fixed case? (was Fwd: Kernel 6.6-rc1 fails to reboot or shutdown Ryzen 5825U)

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Message-ID: <ZRVgAzNLhk90nAwX@debian.me>
Date:   Thu, 28 Sep 2023 18:14:11 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux regression tracking (Thorsten Leemhuis) 
        <regressions@...mhuis.info>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: what to do on magically fixed case? (was Fwd: Kernel 6.6-rc1 fails
 to reboot or shutdown Ryzen 5825U)

[addressing to Thorsten]

On Thu, Sep 14, 2023 at 02:03:00PM +0700, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
> > The Kernel stalls at boot very long with a drm-amdgpu message, but fails to restart or shutdown with secure boot enabled or not. Magic key works to exit. Nothing wrong in the Kernel 6.5 cycle.
> 
> Later, the reporter (Cc'ed) described the regression:
> 
> > Let me be clearer, it does not shutdown at all: magic key for shut down has no effect (o or b). The keyboard is dead. Plus, $ shutdown -r now hangs too. Restart works when using Alt+PrtSc+b. Same when booting stalls for long.
> > 
> > We started bisecting with 20230903 daily kernel, the bug was there. 6.6-rc1 has been removed. Take good note that next boot log after shutdown may or may not be the same log. Plus, booting requires now and then magic key to restart, because the Kernel hangs.  In this case, we must click enter twice + Esc to boot in desktop. 
> > 
> > It booted ok after a cold shutdown with enter twice and ESC ounce + backspace. 
> > ...
> > In all cases, tpm and secure boot are enabled. If secure boot is disabled, when we shut down, magic key works to restart.
> 
> He then pasted journalctl excerpt at the point where the hang occured:
> 
> > This where it stalls for restart. Shut down hangs at the Lenovo image:
> > 
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: SE 1, SH per SE 1, CU per SH 8, active_cu_number 8
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring gfx uses VM inv eng 0 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring gfx_low uses VM inv eng 1 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring gfx_high uses VM inv eng 4 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.0.0 uses VM inv eng 5 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.1.0 uses VM inv eng 6 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.2.0 uses VM inv eng 7 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.3.0 uses VM inv eng 8 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.0.1 uses VM inv eng 9 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.1.1 uses VM inv eng 10 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.2.1 uses VM inv eng 11 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring comp_1.3.1 uses VM inv eng 12 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring kiq_0.2.1.0 uses VM inv eng 13 on hub 0
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring sdma0 uses VM inv eng 0 on hub 8
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring vcn_dec uses VM inv eng 1 on hub 8
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring vcn_enc0 uses VM inv eng 4 on hub 8
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring vcn_enc1 uses VM inv eng 5 on hub 8
> > Sep 13 21:43:08 mm kernel: amdgpu 0000:04:00.0: amdgpu: ring jpeg_dec uses VM inv eng 6 on hub 8
> > Sep 13 21:43:08 mm kernel: [drm] Initialized amdgpu 3.54.0 20150101 for 0000:04:00.0 on minor 0
> > Sep 13 21:43:08 mm kernel: fbcon: amdgpudrmfb (fb0) is primary device
> > Sep 13 21:43:08 mm kernel: [drm] DSC precompute is not needed.
> 
> See Bugzilla for the full thread and links to complete journalctl log.
> 
> Anyway, I'm adding this regression to regzbot:
> 
> #regzbot introduced: v6.5..v6.6 https://bugzilla.kernel.org/show_bug.cgi?id=217905
> #regzbot title: shutdown/reboot hang on Ryzen 5825U (stuck on amdgpu initialization)
> 

Hi Thorsten,

On Bugzilla, the reporter said that this regression was fixed in linux-next
tree without specifying the exact commit that do it. He also did not bisect
as I asked, nor even culprit commit range. Should I mark this regression as 
fixed?

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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