Bug 12541 - (bisected) Assertion at mini-amd64.c:487, condition `amd64_is_imm32 (disp)' not met
Summary: (bisected) Assertion at mini-amd64.c:487, condition `amd64_is_imm32 (disp)' n...
Alias: None
Product: Runtime
Classification: Mono
Component: JIT ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2013-06-04 13:56 UTC by Micael Dias
Modified: 2015-02-24 11:42 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Micael Dias 2013-06-04 13:56:44 UTC
This is a regression.

I have an app that embeds Mono to use C# DLL scripts. When I instantiate a C# object using mono_object_new() and then call mono_runtime_object_init() on it it crashes at mini-amd64.c:487.

I bisected this crash to this commit: https://github.com/mono/mono/commit/6285a057a248e65301def835dfc5971e6df29a39
and as far as I could debug it, it happens because a call is marked as near call but the target value is > 2^32 or something like that (I'm not an expert with compilers, sorry).

When it crashes I get this on the console (Timer.ctor is the ctor of the object being initialized, and all the ctor does is print a line of simple text to the console):

TYPE: 32
* Assertion at mini-amd64.c:487, condition `amd64_is_imm32 (disp)' not met


  at <unknown> <0xffffffff>
  at System.Console..cctor () <0x0001b>
  at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <0xffffffff>
  at <unknown> <0xffffffff>
  at MyEngine.Timer..ctor () <0x0001f>
  at (wrapper runtime-invoke) object.runtime_invoke_void__this__ (object,intptr,intptr,intptr) <0xffffffff>
Comment 1 Micael Dias 2013-06-04 14:01:02 UTC
Stacktrace of the crashing thread:

Thread 1 (Thread 0x7ff04e5f47c0 (LWP 23156)):
#0  0x00007ff04bc307f9 in waitpid () from /usr/lib/libc.so.6
#1  0x00007ff04d3ef4bc in mono_handle_native_sigsegv (signal=<optimized out>, ctx=<optimized out>) at mini-exceptions.c:2344
#2  <signal handler called>
#3  0x00007ff04bbaf1c9 in raise () from /usr/lib/libc.so.6
#4  0x00007ff04bbb05c8 in abort () from /usr/lib/libc.so.6
#5  0x00007ff04d5496d5 in monoeg_g_logv (log_domain=log_domain@entry=0x0, log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0x7ff04d564978 "* Assertion at %s:%d, condition `%s' not met\n", args=args@entry=0x7fffa16b3868) at goutput.c:175
#6  0x00007ff04d549816 in monoeg_assertion_message (format=format@entry=0x7ff04d564978 "* Assertion at %s:%d, condition `%s' not met\n") at goutput.c:195
#7  0x00007ff04d427501 in amd64_patch (target=<optimized out>, code=0x41e2f012 "\350Iج\375H\213\f$L\213\\$\bI\211\vL\213|$PH\203\304", <incomplete sequence \303>) at mini-amd64.c:487
#8  mono_arch_patch_code (method=0x2529340, domain=0x7ff04e4f7cc0, code=0x41e2efc0 "H\203\354XH\211d$0H\211\\$ H\211l$(L\211d$8L\211l$@L\211t$HL\211|$PL\213\377I\273", ji=<optimized out>, dyn_code_mp=<optimized out>, run_cctors=1) at mini-amd64.c:6531
#9  0x00007ff04d35b9c6 in mono_codegen (cfg=cfg@entry=0x2523ea0) at mini.c:3956
#10 0x00007ff04d35c929 in mini_method_compile (method=<optimized out>, opts=opts@entry=101805055, domain=domain@entry=0x7ff04e4f7cc0, run_cctors=run_cctors@entry=1, compile_aot=compile_aot@entry=0, parts=parts@entry=0) at mini.c:5367
#11 0x00007ff04d35fe63 in mono_jit_compile_method_inner (jit_ex=0x7fffa16b3c48, opt=101805055, target_domain=0x7ff04e4f7cc0, method=0x2529340) at mini.c:5689
#12 mono_jit_compile_method_with_opt (method=0x2529340, opt=101805055, ex=ex@entry=0x7fffa16b3c48) at mini.c:5953
#13 0x00007ff04d3609ed in mono_jit_compile_method (method=<optimized out>) at mini.c:5981
#14 0x00007ff04d3f129b in common_call_trampoline (regs=0x7fffa16b3f08, code=0x41e2edcc "H\213\310H\307A(0\211R\002H\307A8\240lQ\002H\307A\030\226\355\342AH\270\250\217QN\360\177", m=0x2529340, vt=0x0, vtable_slot=<optimized out>, need_rgctx_tramp=0, tramp=<optimized out>) at mini-trampolines.c:567
#15 0x0000000041d79192 in ?? ()
#16 0x0000000000000000 in ?? ()
Comment 2 Zoltan Varga 2013-06-06 11:25:55 UTC
Fixed in master by 2424b67a3b55df01a3d70e31d1455429247dfa66.
Comment 3 Mimi 2015-02-24 10:46:27 UTC
I got the same problem here.


1)On Os X 10.8.5, download mono-3.12.0.tar.bz2 and MonoFramework-MDK-3.12.0.macos10.xamarin.x86.pkg. Build Mono 64 bits disabling nls and mcs-build. Install Mono 32 bits and merge it with Mono 64 bits. Test with hello.cs and Mono works fine.

2)Create a C# class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLibrary1
    public class Class1
        public Class1() { }
        public void GreetPeople()
            Console.WriteLine("Hello World\n");

3)Embed Mono in C++ code:

#include "mainwindow.h"
#include <QApplication>

#include <Headers/glib-2.0/glib.h>
#include <mono/jit/jit.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/debug-helpers.h>

int main(int argc, char *argv[])
    QApplication a(argc, argv);
    MainWindow w;

        MonoDomain * domain = mono_jit_init ("Domain");

        MonoAssembly * assembly = NULL;
        assembly = mono_domain_assembly_open (domain, "/Users/mac1/Downloads/zachary/TestLib/libs/ClassLibrary1.dll");
        if (!assembly)
            printf("Open assembly error\n");
            printf("Assembly is loaded\n");

        MonoImage * image = NULL;
        image = mono_assembly_get_image(assembly);
        if (!image)
            printf("Get image error\n");
            printf("Get image successfully\n");

        MonoClass* classHandle = NULL;
        classHandle = mono_class_from_name(image, "ClassLibrary1", "Class1");
        if (!classHandle)
            printf("Get class error\n");
            printf("Get class successfully\n");

        MonoObject* object = NULL;
        object = mono_object_new(domain, classHandle);
        if (!classHandle)
            printf("Get object error\n");
            printf("Get object successfully\n");


        printf("Happy New Year!\n");

    return a.exec();

4)Console output:

Debugging starts
Assembly is loaded
Get image successfully
Get class successfully
Get object successfully
Can't find custom attr constructor image: /Users/mac1/Downloads/zachary/TestLib/libs/ClassLibrary1.dll mtoken: 0x0a000001
* Assertion at class.c:5695, condition `!mono_loader_get_last_error ()' not met

Debugging has finished

I made some research and learnt that the bug was fixed. Does anybody know what is going on here? Any help is appreciated.

Comment 4 Mimi 2015-02-24 11:42:51 UTC
Sorry. There is an error in the original c++ code. It should be read as:

        MonoObject* object = NULL;
        object = mono_object_new(domain, classHandle);
        if (!object)
            printf("Get object error\n");
            printf("Get object successfully\n");

The console outputs are the same, though.