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Message-ID: <fcec3c78-b5d9-eb48-0fc0-d1f27de87f23@leemhuis.info>
Date:   Thu, 19 Jan 2023 15:33:50 +0100
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Subject: Re: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected
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To:     bskeggs@redhat.com, Karol Herbst <kherbst@redhat.com>,
        Lyude Paul <lyude@redhat.com>
References: <b64705e3-2e63-a466-f829-f9568b06766a@googlemail.com>
From:   "Linux kernel regression tracking (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>
Reply-To: Linux regressions mailing list <regressions@lists.linux.dev>
Cc:     Chris Clayton <chris2553@googlemail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        ML dri-devel <dri-devel@lists.freedesktop.org>,
        ML nouveau <nouveau@lists.freedesktop.org>,
        Linux kernel regressions list <regressions@lists.linux.dev>
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[adding various lists and the two other nouveau maintainers to the list
of recipients]

For the rest of this mail:

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 18.01.23 21:59, Chris Clayton wrote:
> Hi.
> 
> I build and installed the lastest development kernel earlier this week. I've found that when I try the laptop down (or
> reboot it), it hangs right at the end of closing the current session. The last line I see on  the screen when rebooting is:
> 
> 	sd 4:0:0:0: [sda] Synchronising SCSI cache
> 
> when closing down I see one additional line:
> 
> 	sd 4:0:0:0 [sda]Stopping disk
> 
> In both cases the machine then hangs and I have to hold down the power button fot a few seconds to switch it off.
> 
> Linux 6.1 is OK but 6.2-rc1 hangs, so I bisected between this two and landed on:
> 
> 	# first bad commit: [0e44c21708761977dcbea9b846b51a6fb684907a] drm/nouveau/flcn: new code to load+boot simple HS FWs
> (VPR scrubber)
> 
> I built and installed a kernel with f15cde64b66161bfa74fb58f4e5697d8265b802e (the parent of the bad commit) checked out
> and that shuts down and reboots fine. It the did the same with the bad commit checked out and that does indeed hang, so
> I'm confident the bisect outcome is OK.
> 
> Kernels 6.1.6 and 5.15.88 are also OK.
> 
> My system had dual GPUs - one intel and one NVidia. Related extracts from 'lscpi -v' is:
> 
> 00:02.0 VGA compatible controller: Intel Corporation CometLake-H GT2 [UHD Graphics] (rev 05) (prog-if 00 [VGA controller])
>         Subsystem: CLEVO/KAPOK Computer CometLake-H GT2 [UHD Graphics]
> 
>         Flags: bus master, fast devsel, latency 0, IRQ 142
> 
>         Memory at c2000000 (64-bit, non-prefetchable) [size=16M]
> 
>         Memory at a0000000 (64-bit, prefetchable) [size=256M]
> 
>         I/O ports at 5000 [size=64]
> 
>         Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
> 
>         Capabilities: [40] Vendor Specific Information: Len=0c <?>
> 
>         Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
> 
>         Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
> 
>         Capabilities: [d0] Power Management version 2
> 
>         Kernel driver in use: i915
> 
>         Kernel modules: i915
> 
> 
> 01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Ti Mobile] (rev a1) (prog-if 00 [VGA
> controller])
>         Subsystem: CLEVO/KAPOK Computer TU117M [GeForce GTX 1650 Ti Mobile]
>         Flags: bus master, fast devsel, latency 0, IRQ 141
>         Memory at c4000000 (32-bit, non-prefetchable) [size=16M]
>         Memory at b0000000 (64-bit, prefetchable) [size=256M]
>         Memory at c0000000 (64-bit, prefetchable) [size=32M]
>         I/O ports at 4000 [size=128]
>         Expansion ROM at c3000000 [disabled] [size=512K]
>         Capabilities: [60] Power Management version 3
>         Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
>         Capabilities: [78] Express Legacy Endpoint, MSI 00
>         Kernel driver in use: nouveau
>         Kernel modules: nouveau
> 
> DRI_PRIME=1 is exported in one of my init scripts (yes, I am still using sysvinit).
> 
> I've attached the bisect.log, but please let me know if I can provide any other diagnostics. Please cc me as I'm not
> subscribed.

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced e44c2170876197
#regzbot title drm: nouveau: hangs on poweroff/reboot
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.