init: Failed to insmod '/lib/modules/apr.ko' with args '': Exec format error while booting Android

Question

I am trying to install Android 13 to RB3 development board. According to Linaro blog this is possible. I followed instrutions on the Linaro wiki page. So, firstly I compiled kernel :

repo init -u https://android.googlesource.com/kernel/manifest -b common-android-mainline
repo sync -j4
tools/bazel clean
tools/bazel run //common:db845c_dist

then, I cloned the Android source code :

repo init -u https://android.googlesource.com/platform/manifest -b master
repo sync -j4

then, I pasted kernel artifacts into Android source code and compiled Android

./device/linaro/dragonboard/fetch-vendor-package.sh
source ./build/envsetup.sh
lunch db845c-userdebug
make TARGET_KERNEL_USE=mainline -j8

it was compiled successfly. After, I flashed Android images:

./device/linaro/dragonboard/installer/db845c/flash-all-aosp.sh

RB3 started to boot after flashing. But an error occured while it was booting :

[    3.886126][    T1] init: init first stage started!
[    3.894311][    T1] init: Loading module /lib/modules/apr.ko with args ''
[    3.901376][    T1] apr: disagrees about version of symbol module_layout
[    3.908203][    T1] init: Failed to insmod '/lib/modules/apr.ko' with args '': Exec format error

I think "Exec format error" is about architecture of the binary file. So output of the file command for apr.ko is this :

apr.ko: ELF 64-bit LSB relocatable, ARM aarch64, version 1 (SYSV), BuildID[sha1]=fa4e013385edb783a708df96f0e6834cad9fe0ac, not stripped

It seems correct to me. Full boot log is here : https://pastebin.com/XTZWZmD9

then I tried pre-compiled kernel from https://ci.android.com. kernel link is : https://ci.android.com/builds/submitted/10380040/kernel_db845c_kleaf/latest I pasted kernel artifacts into Android source code and compiled Android as before.

./device/linaro/dragonboard/fetch-vendor-package.sh
source ./build/envsetup.sh
lunch db845c-userdebug
make TARGET_KERNEL_USE=mainline -j8

now I have again "Exec format error". but there is another error before this line :

[    3.914015][    T1] init: init first stage started!
[    3.922358][    T1] init: Loading module /lib/modules/apr.ko with args ''
[    3.929427][    T1] module apr: .gnu.linkonce.this_module section size must match the kernel's built struct module size at run time
[    3.941451][    T1] init: Failed to insmod '/lib/modules/apr.ko' with args '': Exec format error

Also output of the file command for apr.ko is :

apr.ko: ELF 64-bit LSB relocatable, ARM aarch64, version 1 (SYSV), BuildID[sha1]=398930130c8bea9c488da47636a4f8ae2a2ee413, not stripped

Full boot log is here : https://pastebin.com/3KukqxGC

I am very confused about what is wrong here ? How can I install Android 13 on rb3 ?