examples/python/basic.py segfault when using shared lib (ctypes) #11
Description
Description
Python ctypes example crashes with SIGSEGV when invoking a simple exported wasm function.
Steps to reproduce
- Build shared library:
zig build lib - Run example:
python3 examples/python/basic.py - Observed: immediate SIGSEGV (core dump)
zwasm version
1.6.0 (d83c0ff)
Platform
Linux x86_64
Additional context
Environment
- Python: Python 3.12.3
- Zig: Zig 0.15.2
- libc: glibc 2.39
Backtrace
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6618935 in vm.Vm.callFunction (self=0x7ffff62e3000, instance=0x7ffff7b80308, func_ptr=0x7ffff7b60380, args=..., results=...) from <REPO_ROOT>/examples/python/../../zig-out/lib/libzwasm.so
#0 0x00007ffff6618935 in vm.Vm.callFunction (self=0x7ffff62e3000, instance=0x7ffff7b80308, func_ptr=0x7ffff7b60380, args=..., results=...) from <REPO_ROOT>/examples/python/../../zig-out/lib/libzwasm.so
inst = 0x0
has_v128 = true
param_slots = 0
result_start = 21474836481
wf = 0x7ffff7b603a0
base = 0
result_slots = 0
#1 0x00007ffff6859545 in vm.Vm.invoke (self=0x7ffff62e3000, instance=0x7ffff7b80308, name=..., args=..., results=...) from <REPO_ROOT>/examples/python/../../zig-out/lib/libzwasm.so
func_addr = 0
func_ptr = 0x7ffff7b60380
#2 0x00007ffff6858e17 in types.WasmModule.invoke (self=0x7ffff7b80000, name=..., args=..., results=...) from <REPO_ROOT>/examples/python/../../zig-out/lib/libzwasm.so
No locals.
#3 0x00007ffff68591b5 in zwasm_module_invoke (module=0x7ffff7faf000, name_ptr=0xb39410 <_PyRuntime+16464> "f", args=..., nargs=0, results=..., nresults=1) from <REPO_ROOT>/examples/python/../../zig-out/lib/libzwasm.so
name = {ptr = 0xb39410 <_PyRuntime+16464> "f", len = 1}
args_slice = {ptr = 0x7fffffffd050, len = 0}
results_slice = {ptr = 0x7ffff6a3a2a0, len = 1}
#4 0x00007ffff7bb7b16 in ?? () from /lib/x86_64-linux-gnu/libffi.so.8
No symbol table info available.
#5 0x00007ffff7bb43ef in ?? () from /lib/x86_64-linux-gnu/libffi.so.8
No symbol table info available.
#6 0x00007ffff7bb70be in ffi_call () from /lib/x86_64-linux-gnu/libffi.so.8
No symbol table info available.
#7 0x00007ffff7bca11c in ?? () from /usr/lib/python3.12/lib-dynload/_ctypes.cpython-312-x86_64-linux-gnu.so
No symbol table info available.
#8 0x00007ffff7bc52af in ?? () from /usr/lib/python3.12/lib-dynload/_ctypes.cpython-312-x86_64-linux-gnu.so
No symbol table info available.
#9 0x0000000000548f75 in _PyObject_MakeTpCall ()
No symbol table info available.
#10 0x00000000005d6f09 in _PyEval_EvalFrameDefault ()
No symbol table info available.
#11 0x00000000005d543b in PyEval_EvalCode ()
No symbol table info available.
#12 0x00000000006085d2 in ?? ()
No symbol table info available.
#13 0x00000000006b4d03 in ?? ()
No symbol table info available.
#14 0x00000000006b4a6a in _PyRun_SimpleFileObject ()
No symbol table info available.
#15 0x00000000006b489f in _PyRun_AnyFileObject ()
No symbol table info available.
#16 0x00000000006bc905 in Py_RunMain ()
No symbol table info available.
#17 0x00000000006bc3ed in Py_BytesMain ()
No symbol table info available.
#18 0x00007ffff7c2a1ca in __libc_start_call_main (main=main@entry=0x518930, argc=argc@entry=2, argv=argv@entry=0x7fffffffdc18) at ../sysdeps/nptl/libc_start_call_main.h:58
self = <optimized out>
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737488346136, 5310030842174122640, 2, 0, 10649040, 140737354125312, 5310030842188802704, 5310048045328116368}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x2, 0x7fffffffdc10}, data = {prev = 0x0, cleanup = 0x0, canceltype = 2}}}
not_first_call = <optimized out>
#19 0x00007ffff7c2a28b in __libc_start_main_impl (main=0x518930, argc=2, argv=0x7fffffffdc18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdc08) at ../csu/libc-start.c:360
No locals.
#20 0x00000000006576c5 in _start ()
No symbol table info available.