Hi,
i want to remind about an issue which was originally reported by Wayne
Piekarski [1]. I'm able to reproduce this oops with Mainline Linux 5.0.2
on a Raspberry Pi 3B+ (arm64/defconfig) and according to Jan Kratochvil
[2] this applies to 5.1.0 and 5.2.0.
The crash is reproducible since commit c55191e96ca ("arm64: mm: apply
r/o permissions of VM areas to its linear alias as well"), but the root
cause of the crash was introduced much earlier with commit 56406e017a88
("usb: dwc2: Fix DMA alignment to start at allocated boundary").
I tested successfully the following workarounds with the RPi 3B+:
1) Disable RODATA_FULL_DEFAULT_ENABLED
2) revert commit 56406e017a88 ("usb: dwc2: Fix DMA alignment to start at
allocated boundary")
It would be nice if someone can come up with a proper solution.
Regards
Stefan
[1] - https://marc.info/?l=linux-usb&m=155440243702650&w=2
[2] - https://bugzilla.kernel.org/show_bug.cgi?id=203149
