Kernel freeze upon suspendig devices during hibernation to disk

[nagmat84]

The modules cause a kernel freeze when the kernel requests all drivers to suspend the devices during hibernation of disk.

When the modules gpio_usbio , i2c_usbio and usbio are loaded, kernel 6.14.8 freezes during device suspension. I did a binary search over all loaded modules and repeatedly run

echo devices > /sys/power/pm_test
echo disk > /sys/power/state

as described in Kernel Docs: Debugging Hibernation and Suspend. I was able to identify these three modules as the culprits.

My dmesg output

$ dmesg -t | egrep -i 'gpio|ipu|regulator|ov08x40|usbio'
usbio: loading out-of-tree module taints kernel.
usbio-bridge 3-9:1.0: bank:0 map:0x0000001f
usbio-bridge 3-9:1.0: bank:1 map:0x0000001f
usbio-bridge 3-9:1.0: bank:2 map:0x0000001f
usbio-bridge 3-9:1.0: bank:3 map:0x00000001
usbio-bridge 3-9:1.0: USB Bridge device init success
usbcore: registered new interface driver usbio-bridge
usbio-i2c usbio-i2c.29.auto: hid INTC1008 uid 0 new uid1
intel-ipu6 0000:00:05.0: enabling device (0000 -> 0002)
Loading firmware: intel/ipu/ipu6epmtl_fw.bin
intel-ipu6 0000:00:05.0: Found supported sensor OVTI08F4:00
intel-ipu6 0000:00:05.0: Connected 1 cameras
intel-ipu6 0000:00:05.0: Sending BOOT_LOAD to CSE
ov08x40 i2c-OVTI08F4:00: supply dovdd not found, using dummy regulator
ov08x40 i2c-OVTI08F4:00: supply avdd not found, using dummy regulator
ov08x40 i2c-OVTI08F4:00: supply dvdd not found, using dummy regulator
intel-ipu6 0000:00:05.0: Sending AUTHENTICATE_RUN to CSE
intel-ipu6 0000:00:05.0: CSE authenticate_run done
intel-ipu6 0000:00:05.0: IPU6-v4[7d19] hardware version 6

Uname: Linux 6.14.8-gentoo #2 SMP PREEMPT_DYNAMIC Sun May 25 14:28:55 CEST 2025 x86_64 Intel(R) Core(TM) Ultra 5 125U GenuineIntel GNU/Linux

[nagmat84]

If there is anything I can do to pinpoint the root of the problem, e.g. debugging the kernel, obtaining debug logs during device suspension, etc. I am happy to help. However, I would probably need some support and someone who tells me what I need to do (kernel parameters, setting up an external logger, etc.) as I have never done that before.

[iacpda]

Please try with new usbio-main