From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Seiderer <ps.report@gmx.net>
Date: Sat, 23 May 2020 22:29:48 +0200
Subject: [Buildroot] COG crashes on Pi4 (wpe_webkit)
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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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