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SubjectRe: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected
On 27.01.23 20:46, Chris Clayton wrote:
> [Resend because the mail client on my phone decided to turn HTML on behind my back, so my reply got bounced.]
> Thanks Thorsten.
> I did try to revert but it didnt revert cleanly and I don't have the knowledge to fix it up.
> The patch was part of a merge that included a number of related patches. Tomorrow, I'll try to revert the lot and report
> back.

You are free to do so, but there is no need for that from my side. I
only wanted to know if a simple revert would do the trick; if it
doesn't, it in my experience often is best to leave things to the
developers of the code in question, as they know it best and thus have a
better idea which hidden side effect a more complex revert might have.

Ciao, Thorsten

> On 27/01/2023 11:20, Linux kernel regression tracking (Thorsten Leemhuis) wrote:
>> Hi, this is your Linux kernel regression tracker. Top-posting for once,
>> to make this easily accessible to everyone.
>> @nouveau-maintainers, did anyone take a look at this? The report is
>> already 8 days old and I don't see a single reply. Sure, we'll likely
>> get a -rc8, but still it would be good to not fix this on the finish line.
>> Chris, btw, did you try if you can revert the commit on top of latest
>> mainline? And if so, does it fix the problem?
>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
>> --
>> Everything you wanna know about Linux kernel regression tracking:
>> If I did something stupid, please tell me, as explained on that page.
>> #regzbot poke
>> On 19.01.23 15:33, Linux kernel regression tracking (Thorsten Leemhuis)
>> wrote:
>>> [adding various lists and the two other nouveau maintainers to the list
>>> of recipients]
>>> 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:
>>> That page also explains what to do if mails like this annoy you.

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