Attempt to avoid random kernel panic reboots

[ClassfulNick]

I'm experiencing random kernel panic reboots on my alioth. Googling strings appeared in /sys/fs/pstore/console-ramoops-0 like "qmi_rmnet_set_powersave_mode" etc led me here and that user then said "No longer getting crashes/reboots with the August 2nd build but instead get a bunch of network resets"

I think at least network resets seem to be better than the whole system crashes randomly. Therefore I decided to patch the kernel & see what's coming. I've managed to compile the kernel (with the help of tons of googling...) & it seems to work, except that a "There is an internal problem in your device. Please contact your manufacturer" popup shows every time the device boots into lockscreen which doesn't seem to be an issue.

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I built the kernel without doing a full repo sync etc. I just cloned this "android_kernel_xiaomi_sm8250" repository.

The latest android-ndk-r23b didn't seem to work, so that I switched to older android-ndk-r22b & it worked.

I modified .config (originally pulled from /proc/config.gz on alioth) to build some modules I'm personally interested in, like nfs, tcp_bbr etc. I then found that the /vendor has insufficient inode count to contain additional kernel driver files so that I reformatted that partition to enlarge inode count.

export PATH=${NDK_PATH}/toolchains/llvm/prebuilt/linux-x86_64/bin:${NDK_PATH}/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin:${NDK_PATH}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH

make -j$(nproc --all) O=output_dir INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=modules_install_dir ARCH=arm64 SUBARCH=arm64 CC=clang CLANG_TRIPLE=aarch64-linux-gnu- CROSS_COMPILE=aarch64-linux-android- CROSS_COMPILE_ARM32=arm-linux-androideabi-

make modules_install

KERNEL_VERSION=$(awk '{print $3}' output_dir/include/generated/utsrelease.h | tr -d "\"")
mkdir -p output_dir/modules/lib/modules/${KERNEL_VERSION}/
cp output_dir/modules.builtin output_dir/modules/lib/modules/${KERNEL_VERSION}/
cp output_dir/modules.order output_dir/modules/lib/modules/${KERNEL_VERSION}/
find output_dir/modules_install_dir | grep ko$ | while read FILE; do
    cp ${FILE} output_dir/modules/lib/modules/${KERNEL_VERSION}/
done
depmod --all --basedir=output_dir/modules --filesyms=output_dir/System.map --symvers=output_dir/Module.symvers ${KERNEL_VERSION}

There were some compilation errors but I managed to get through them. Also, I found that make clean (or make mrproper etc) deleted some driver firmware files with .i file extension, but then I found that this issue doesn't arise if O=output_dir is given.

Finally I used libmagiskboot.so inside Magisk.apk to replace the kernel.

[ClassfulNick]

Still panic