[Buildroot] COG crashes on Pi4 (wpe_webkit)

[Daniel HiFiBerry <daniel@hifiberry.com>]

Hi Peter,

While I didn't test with a minimal configuration, using the 
"--backend=drm-backend.so" doesn't make a difference in my full-blown 
build.
I'm using this already. I will do some more experiments...

Best regards,
Daniel

------ Originalnachricht ------
Von: "Peter Seiderer" <ps.report@gmx.net>
An: "usul27" <daniel@hifiberry.com>
Cc: buildroot at busybox.net
Gesendet: 5/23/2020 10:29:48 PM
Betreff: Re: [Buildroot] COG crashes on Pi4 (wpe_webkit)

>Hello Daniel,
>
>On Fri, 22 May 2020 09:17:18 -0500 (CDT), usul27 <daniel@hifiberry.com> wrote:
>
>>  Ok, finally got a build with debug symbols:
>>
>>  Thread 1 "cog" received signal SIGSEGV, Segmentation fault.
>>  0x00000000 in ?? ()
>>  (gdb) backtrace
>>  #0  0x00000000 in ?? ()
>>  #1  0xb1799f84 in ffi_call_SYSV () from /lib/libffi.so.7
>>  #2  0xb17993fc in ffi_call_int () from /lib/libffi.so.7
>>  #3  0xb1799b1c in ffi_call () from /lib/libffi.so.7
>>  #4  0xb149b28c in wl_closure_invoke (closure=closure at entry=0xadb03a00,
>>  flags=flags at entry=2, target=<optimized out>, opcode=3025639260,
>>  data=<optimized out>, data at entry=0x74c60) at src/connection.c:1014
>>  #5  0xb1497db0 in wl_client_connection_data (fd=<optimized out>,
>>  mask=<optimized out>, data=0x74c60) at src/wayland-server.c:429
>>  #6  0xb1499608 in wl_event_loop_dispatch (loop=0x5bfc8, timeout=<optimized
>>  out>) at src/event-loop.c:640
>>  #7  0xb0c59400 in WS::ServerSource::{lambda(_GSource*, int (*)(void*),
>>  void*)#3}::_FUN(_GSource*, int (*)(void*), void*) () from
>>  /lib/libWPEBackend-fdo-1.0.so.1
>>  Backtrace stopped: previous frame identical to this frame (corrupt stack?)
>>
>>  Somebody has any idea?
>
>Did some test on RPi4 with the following defconfig:
>
>BR2_arm=y
>BR2_cortex_a72=y
>BR2_ARM_FPU_NEON_VFPV4=y
>BR2_ENABLE_DEBUG=y
>BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
>BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_19=y
>BR2_BINUTILS_VERSION_2_31_X=y
>BR2_TOOLCHAIN_BUILDROOT_CXX=y
>BR2_PACKAGE_HOST_GDB=y
>BR2_GDB_VERSION_8_3=y
>BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
>BR2_SYSTEM_DHCP="eth0"
>BR2_GENERATE_LOCALE="en_US"
>BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi4/post-build.sh"
>BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi4/post-image.sh"
>BR2_ROOTFS_POST_SCRIPT_ARGS="--add-pi3-miniuart-bt-overlay"
>BR2_LINUX_KERNEL=y
>BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
>BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,4f2a4cc501c428c940549f39d5562e60404ac4f7)/linux-4f2a4cc501c428c940549f39d5562e60404ac4f7.tar.gz"
>BR2_LINUX_KERNEL_DEFCONFIG="bcm2711"
>BR2_LINUX_KERNEL_DTS_SUPPORT=y
>BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2711-rpi-4-b"
>BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
>BR2_PACKAGE_STRACE=y
>BR2_PACKAGE_DEJAVU=y
>BR2_PACKAGE_COG=y
>BR2_PACKAGE_MESA3D=y
>BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_KMSRO=y
>BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_V3D=y
>BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VC4=y
>BR2_PACKAGE_MESA3D_OPENGL_ES=y
>BR2_PACKAGE_WESTON=y
>BR2_PACKAGE_WESTON_DRM=y
>BR2_PACKAGE_WESTON_DEMO_CLIENTS=y
>BR2_PACKAGE_RPI_FIRMWARE=y
>BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4=y
>BR2_PACKAGE_WPEWEBKIT=y
>BR2_PACKAGE_OPENSSH=y
>BR2_TARGET_ROOTFS_EXT2=y
>BR2_TARGET_ROOTFS_EXT2_4=y
>BR2_TARGET_ROOTFS_EXT2_LABEL=""
>BR2_TARGET_ROOTFS_EXT2_SIZE="256M"
># BR2_TARGET_ROOTFS_TAR is not set
>BR2_PACKAGE_HOST_DOSFSTOOLS=y
>BR2_PACKAGE_HOST_GENIMAGE=y
>BR2_PACKAGE_HOST_MTOOLS=y
>
>Running:
>
>	$ export XDG_RUNTIME_DIR=/tmp
>	$ weston --tty 1 &
>	$ cog --platform=fdo
>
>leads to the 'Segmentation fault' as you described...
>
>Running:
>
>	$ export XDG_RUNTIME_DIR=/tmp
>	$ weston --tty 1 --backend=drm-backend.so &
>	$ cog --platform=fdo
>
>works...
>
>Regards,
>Peter
>
>
>>
>>
>>
>>
>>  --
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