On Wed, 17 Mar 2021 at 15:34, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, Mar 17, 2021 at 02:28:40PM +0530, Naresh Kamboju wrote: > > While booting Linux mainline master 5.12.0-rc2 and 5.12.0-rc3 on arm64 > > Hikey device the following KFENCE bug was found. > > > > Recently, we have enabled CONFIG_KFENCE=y and started seeing this crash. > > kernel BUG log: > > What USB traffic are you having here? This is getting triggered while booting the device. We are not running any traffic. > > And has this ever not triggered? No. It was not triggered before. Since CONFIG_KFENCE=y is added to our builds recently we are able to reproduce always on recent builds. Steps to reproduce: 1) Build arm64 kernel Image with this given config. - tuxmake --runtime podman --target-arch arm64 --toolchain gcc-9 --kconfig defconfig --kconfig-add https://builds.tuxbuild.com/1pfztfszUNcDwOAyMrw2wPMKNfc/config 2) Boot arm64 hikey hi6220 device 3) While booting the device you will get to see this kernel BUG: [ 18.243075] BUG: KFENCE: memory corruption in usb_get_device_descriptor+0x80/0xb0 [ 18.813861] BUG: KFENCE: memory corruption in __usbnet_read_cmd.isra.0+0xd0/0x1a0 link: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.12-rc2-487-gf296bfd5cd04/testrun/4155170/suite/linux-log-parser/test/check-kernel-bug-2388200/log - Naresh