linux-kernel - linux-6.2-rc4+ hangs on poweroff/reboot: Bisected

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Message-ID: <b64705e3-2e63-a466-f829-f9568b06766a@googlemail.com>
Date:   Wed, 18 Jan 2023 20:59:36 +0000
From:   Chris Clayton <chris2553@...glemail.com>
To:     LKML <linux-kernel@...r.kernel.org>, bskeggs@...hat.com
Subject: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected

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.

Chris
View attachment "bisect-log.txt" of type "text/plain" (2640 bytes)