What of this C# code can result in a call to free() in compiled form?

Asked Oct 23 '13 at 13:28

Active Oct 23 '13 at 13:34

Viewed 332 times

I'm investigating a stack trace of a compiled Unity C# code. It results in an error inside the standard C free() function. The frame where the free() is called is a pretty simple method, which looks like this:

void Method()
{
    SomeOtherMethod();

    if (StaticClass.StaticProperty == SomeMethod())
    {
        StaticClass.StaticProperty = 0;

        StopCoroutine("Coroutine name");

        if (m_privateField < CONSTANT)
            YetAnotherMethod();
        else
            AndOneMoreMethod();
    }
}

It seems to me that all I do here is calling other code and doing very basic equality comparisons and conditions; however, there is no other frames between this code and free(). What part of this could possibly call it?

Here's this part of the stack trace symbolized by xcode:

11  libsystem_c.dylib               0x3aa5be90 _sigtramp + 40
12  libsystem_c.dylib               0x3aa272dc free + 168
13  dev                             0x002ea644 ___lldb_unnamed_function10628$$dev + 176

I was able to determined that line 13 is this method with the help of atoc.

edited May 23 '17 at 12:10

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asked Oct 23 '13 at 13:28

Max Yankov

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You do not show the stack trace so it's not easy to answer. – poupou Oct 23 '13 at 13:31
1

Why don't you disassemble to IL and see for yourself? – Roy Dictus Oct 23 '13 at 13:32
@poupou Added stack trace. – Max Yankov Oct 23 '13 at 13:36
@RoyDictus if I'm not mistaken, in Unity C# is compiled to native, not IL. – Max Yankov Oct 23 '13 at 13:50
Maybe one of the called methods was inlined. – svinja Oct 23 '13 at 14:03
StopCoroutine can free the associated memory. – Heisenbug Oct 23 '13 at 14:13
@Heisenbug I thought so too. However, StopCoroutine doesn't seem to cause this bug anywhere but this. It's possible that this coroutine isn't started at the time of this code's execution — but in all other situations like this it doesn't result in any crashes. – Max Yankov Oct 23 '13 at 14:21

What of this C# code can result in a call to free() in compiled form?

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