I have built an AOSP image (*android-9.0.0_r47, build ID: PQ3B.190801.002*) 
for *Pixel 3a (sargo)* from the source according to Google's official 
documentation <https://source.android.com/setup/build/building>. To flash 
the image, I have done the following:


   - Booted into fastboot mode, and then TWRP
   - Wiped Dalvik cache, system, data from TWRP to prevent dirty flash
   - fastboot flashall -w flashed boot, dtbo, system, system_other and 
   vbmeta images to respective partitions
   - Reboot


A white flash screen with Google logo showed up for a split moment and then 
it went back to fastboot mode again. I retried flashing several times with 
different combinations. Several times I re-flashed the OTA image to go back 
to a "sane" state (fortunately official image boots every time) to start 
from scratch. Nothing helped.

Here is my build configuration:

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=9
TARGET_PRODUCT=aosp_sargo
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm64
TARGET_ARCH_VARIANT=armv8-2a
TARGET_CPU_VARIANT=cortex-a75
TARGET_2ND_ARCH=arm
TARGET_2ND_ARCH_VARIANT=armv8-a
TARGET_2ND_CPU_VARIANT=cortex-a75
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-4.15.0-70-generic-x86_64-Ubuntu-18.04.3-LTS
HOST_CROSS_OS=windows
HOST_CROSS_ARCH=x86
HOST_CROSS_2ND_ARCH=x86_64
HOST_BUILD_TYPE=release
BUILD_ID=PQ3B.190801.002
OUT_DIR=out
PRODUCT_SOONG_NAMESPACES=device/google/bonito hardware/google/av 
hardware/google/interfaces hardware/google/pixel hardware/qcom/sdm710 
vendor/qcom/sdm710
============================================

Does anybody have any idea what might be going wrong?

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