[llvm-dev] segfault calling SDL_Init with FFI/ MCJIT

[edA-qa mort-ora-y via llvm-dev]

I'm getting a segfault when I call `SDL_Init( SDL_INIT_VIDEO )` within
the MCJIT.  If I compile the same program to an EXE I don't have a problem.

Are there any general restrictions, or known issues, with loading a
library like SDL2 via the MCJIT?  (LLVM-3.8 still)

The stack trace, from GDB, is below. I noticed the error actually
happens deep inside a transitively loaded GL drive module, but still
within the LLVM code.  Does LLVM have hooks for when libraries are loaded?


#0  __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:173
#1  0x00007fffeff1a667 in llvm::cl::generic_parser_base::findOption(char
const*) () from /home/src/leaf/sdl/dist/libLLVM-3.8.so
#2  0x00007ffff02f291f in
llvm::RegisterPassParser<llvm::MachineSchedRegistry>::NotifyAdd(char
const*, void* (*)(), char const*) () from
/home/src/leaf/sdl/dist/libLLVM-3.8.so
#3  0x00007fffe3ab4754 in
llvm::MachinePassRegistry::Add(llvm::MachinePassRegistryNode*) () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#4  0x00007fffe36fe616 in ?? () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#5  0x00007ffff7de76ba in call_init (l=<optimised out>,
argc=argc at entry=4, argv=argv at entry=0x7fffffffdae8,
env=env at entry=0x7fffffffdb10) at dl-init.c:72
#6  0x00007ffff7de77cb in call_init (env=0x7fffffffdb10,
argv=0x7fffffffdae8, argc=4, l=<optimised out>) at dl-init.c:30
#7  _dl_init (main_map=main_map at entry=0x775af0, argc=4,
argv=0x7fffffffdae8, env=0x7fffffffdb10) at dl-init.c:120
#8  0x00007ffff7dec8e2 in dl_open_worker (a=a at entry=0x7fffffffc520) at
dl-open.c:575
#9  0x00007ffff7de7564 in _dl_catch_error
(objname=objname at entry=0x7fffffffc510,
errstring=errstring at entry=0x7fffffffc518,
mallocedp=mallocedp at entry=0x7fffffffc50f,
    operate=operate at entry=0x7ffff7dec4d0 <dl_open_worker>,
args=args at entry=0x7fffffffc520) at dl-error.c:187
#10 0x00007ffff7debda9 in _dl_open (file=0x7fffffffc7a0
"/usr/lib/x86_64-linux-gnu/dri/r600_dri.so", mode=-2147483390,
caller_dlopen=0x7fffe9580a39, nsid=-2, argc=<optimised out>,
    argv=<optimised out>, env=0x7fffffffdb10) at dl-open.c:660
#11 0x00007ffff53c4f09 in dlopen_doit (a=a at entry=0x7fffffffc750) at
dlopen.c:66
#12 0x00007ffff7de7564 in _dl_catch_error (objname=0x69e560,
errstring=0x69e568, mallocedp=0x69e558, operate=0x7ffff53c4eb0
<dlopen_doit>, args=0x7fffffffc750) at dl-error.c:187
#13 0x00007ffff53c5571 in _dlerror_run
(operate=operate at entry=0x7ffff53c4eb0 <dlopen_doit>,
args=args at entry=0x7fffffffc750) at dlerror.c:163
#14 0x00007ffff53c4fa1 in __dlopen (file=<optimised out>,
mode=<optimised out>) at dlopen.c:87
#15 0x00007fffe9580a39 in ?? () from
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
#16 0x00007fffe95838f3 in ?? () from
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
#17 0x00007fffe955ba54 in ?? () from
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
#18 0x00007fffe9557c2b in ?? () from
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
#19 0x00007fffe9558062 in glXQueryExtensionsString () from
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
#20 0x00007fffef080caf in ?? () from /usr/lib/x86_64-linux-gnu/libSDL2.so
#21 0x00007fffef07337f in ?? () from /usr/lib/x86_64-linux-gnu/libSDL2.so
#22 0x00007fffef07528c in ?? () from /usr/lib/x86_64-linux-gnu/libSDL2.so
#23 0x00007fffef074f35 in ?? () from /usr/lib/x86_64-linux-gnu/libSDL2.so
#24 0x00007fffeefdc397 in ?? () from /usr/lib/x86_64-linux-gnu/libSDL2.so
#25 0x00007ffff7ff654c in _init_module_main_5 ()
#26 0x00007ffff7ff610f in _entry ()
#27 0x00007ffff7ff69ec in main ()
#28 0x00007ffff0d7f9bd in llvm::MCJIT::runFunction(llvm::Function*,
llvm::ArrayRef<llvm::GenericValue>) () from
/home/src/leaf/sdl/dist/libLLVM-3.8.so
#29 0x00007ffff4c843d9 in ir_llvm::gen::execute
(this=this at entry=0x7fffffffcdb0, m=..., sc="") at src/ir/llvm/gen.cpp:249
#30 0x00007ffff6bd9e90 in runner::execute (this=0x7fffffffd8d0,
m=std::shared_ptr (count 3, weak 0) 0x6dc3b0, args=std::vector of length
0, capacity 0) at src/runner/runner.cpp:339
#31 0x00007ffff6bda264 in runner::execute
(this=this at entry=0x7fffffffd8d0, m=std::shared_ptr (count 3, weak 0)
0x6dc3b0) at src/runner/runner.cpp:264
#32 0x0000000000413687 in main (argc=4, argv=0x7fffffffdae8) at
src/bin/leaf.cpp:256

-- 
edA-qa mort-ora-y  
	http://mortoray.com/

Creator of the Leaf language
	http://leaflang.org/

Streaming algorithms, AI, and design on Twitch
	https://www.twitch.tv/mortoray

Twitter
	edaqa