Segmentation fault at boot screen

[supagu]

I'm working on linux and trying to get my build system setup.

when i build with:
scons -j 4 platform=x11 bits=64 builtin_openssl=yes
I get a working exe

if i use:
scons -j 4 platform=x11 tools=yes target=release_debug bits=64 builtin_openssl=yes
or
scons -j 4 platform=x11 tools=no target=release bits=64 builtin_openssl=yes

the generated exe loads the splash screen then crashes with a segmentation fault.
gdb bt gives me:

#0 0x0000000001bbd520 in atomic_conditional_increment(unsigned int*) ()
#1 0x0000000001bd1f78 in Reference::init_ref() ()
#2 0x0000000001c187c8 in Image::load(String const&) ()
#3 0x00000000008ca56b in Main::start() ()
#4 0x00000000008b46a1 in main ()

I do have a custom boot splash image loaded.

[supagu]

upon further investigation this is project specific, I'll have to debug it myself I think

[supagu]

in godot/platform/x11/detect.py if i comment out line 131, which causes:
env.Prepend(CCFLAGS=['-g2'])

and build using:
scons -j4 platform=x11 target=release_debug bits=64 builtin_openssl=yes tools=yes

the editor works fine.
IF I revert the change, then the editor crashes as described in #9301.

So this looks to be some linker optimisation bug....

[vnen]

I assume you are using GCC. If so, which version it is? Have you tried compiling with Clang?

[supagu]

gcc (GCC) 7.1.1 20170528
I'll give clang a shot. Any idea how I can specify which compiler is used to build godot?

[Calinou]

To compile Godot with Clang, install it then add use_llvm=yes to the SCons command line.

[supagu]

scons use_llvm=yes platform=x11 builtin_openssl=yes tools=yes target=release_debug bits=64
and
scons use_llvm=yes platform=x11 builtin_openssl=yes tools=no target=release bits=64 -j4

both run fine with the binarys they produce

[vnen]

Looks like another GCC problem. Seems diferrent from #4623 and #4673.

[hpvb]

Can you retest with current master? This is probably fixed with #10581

[supagu]

my release build works: "scons -j 4 platform=x11 tools=no target=release bits=64 builtin_openssl=yes"

my release_debug build does not work: "scons -j 4 platform=x11 tools=yes target=release_debug bits=64 builtin_openssl=yes"

I get the following error:

Loading Menu prefab: res://Prefab/UI/Matrix.tscn
_ready called on matrix : /root/MainMenu/Matrix
CERT STR: /CN=*.matrix.org
VALID: 1
CONNECTION RESULT: 1
cert_ok: 1
[New Thread 0x7fffe121f700 (LWP 26087)]
Finished Menu prefabs

Thread 1 "linux_x11_64_de" received signal SIGSEGV, Segmentation fault.
__cxxabiv1::__dynamic_cast (src_ptr=0x0, src_type=0x102c0b158 ,
dst_type=0x102bee250 , src2dst=0) at /build/gcc-multilib/src/gcc/libstdc++-v3/libsupc++/dyncast.cc:50
50 /build/gcc-multilib/src/gcc/libstdc++-v3/libsupc++/dyncast.cc: No such file or directory.
(gdb) bt
#0 __cxxabiv1::__dynamic_cast (src_ptr=0x0, src_type=0x102c0b158 ,
dst_type=0x102bee250 , src2dst=0) at /build/gcc-multilib/src/gcc/libstdc++-v3/libsupc++/dyncast.cc:50
#1 0x000000010129a4bc in Tree::_create_item(Object*) ()
#2 0x0000000100e84c8b in MethodBind1R<Object*, Object*>::call(Object*, Variant const**, int, Variant::CallError&) ()
#3 0x0000000101a0fb8b in Object::call(StringName const&, Variant const**, int, Variant::CallError&) ()
#4 0x0000000101a33ae3 in Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) ()
#5 0x000000010074f44f in GDFunction::call(GDInstance*, Variant const**, int, Variant::CallError&, GDFunction::CallState*) ()
#6 0x0000000100771e75 in GDInstance::_ml_call_reversed(GDScript*, StringName const&, Variant const**, int) ()
#7 0x000000010116f292 in Node::_notification(int) ()
#8 0x0000000101158c74 in CanvasLayer::_notificationv(int, bool) ()
#9 0x0000000101a082c4 in Object::notification(int, bool) ()
#10 0x000000010115f157 in Node::_propagate_ready() ()
#11 0x000000010116d2e7 in Node::_set_tree(SceneTree*) ()
#12 0x000000010116d42c in Node::_add_child_nocheck(Node*, StringName const&) ()
#13 0x000000010116d779 in Node::add_child(Node*, bool) ()
#14 0x00000001006f0220 in MethodBind1<Node*>::call(Object*, Variant const**, int, Variant::CallError&) ()
#15 0x0000000101a0fb8b in Object::call(StringName const&, Variant const**, int, Variant::CallError&) ()
#16 0x0000000101a7465d in MessageQueue::_call_function(Object*, StringName const&, Variant const*, int, bool) ()
#17 0x0000000101a748b3 in MessageQueue::flush() ()
#18 0x000000010066013a in Main::iteration() ()
#19 0x00000001006596c1 in OS_X11::run() ()
#20 0x0000000100652b2c in main ()
(gdb)

[hpvb]

Would it be possible for you to send me the project that is causing this crash?

[supagu]

Ill take a stab at debugging it when i get a chance. Failing that I'll see if i can get you a build.

[hpvb]

What might help is building like this:

cons -j 4 platform=x11 tools=yes target=release_debug debug_release=yes bits=64 builtin_openssl=yes

[hpvb]

I think this is now fixed together with another issue in #10701

[supagu]

i can confirm there is now boot crash! even the mingw windows builds are working for me!

[hpvb]

hurrah!