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<TITLE> [mono-android] PSA: runtime aborts without stack traces
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<H1>[mono-android] PSA: runtime aborts without stack traces</H1>
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<B>Jonathan Pryor</B>
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TITLE="[mono-android] PSA: runtime aborts without stack traces">jonp at xamarin.com
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<I>Thu Dec 22 11:04:18 EST 2011</I>
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<PRE>There have been several mentions of runtime aborts that do not contain a stack trace, e.g.
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<A HREF="http://lists.ximian.com/pipermail/monodroid/2011-December/007756.html">http://lists.ximian.com/pipermail/monodroid/2011-December/007756.html</A>
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<A HREF="http://lists.ximian.com/pipermail/monodroid/2011-December/007862.html">http://lists.ximian.com/pipermail/monodroid/2011-December/007862.html</A>
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We have discovered a [0] cause: stack overflow.
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Mono/ARM has no stack overflow support at the moment, so mono aborts on stack overflow. (Mono usually aborts _anyway_, but usually you'll at least get some stack trace output because of it. Mono/ARM does not. We will be improving this in a future release.)
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Combined with a breaking change in Mono for Android 4.0, in which Java.Lang.Object.Dispose() was made non-virtual and a virtual Java.Lang.Object.Dispose(bool) method was added, it is now very easy to trigger stack overflow. Consider:
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class Death : Java.Lang.Object {
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protected override void Dispose (bool disposing)
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{
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Android.Util.Log.Info ("death", "Death.Dispose(bool)");
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base.Dispose (); // BAD
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}
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}
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If you create and dispose of an instance of Death:
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using (var f = new Death ()) {
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}
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then your app will crash with a stack overflow, and no stack trace will be printed. (You will get a ton of "Death.Dispose(bool)" messages printed to logcat, but most Dispose() implementations won't actually log anything...hence the stacktrace-less nature of the abort.)
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The solution is to review any Java.Lang.Object.Dispose(bool) overrides and ensure that IF they call base.Dispose(), they call the Dispose(bool) method, NOT Dispose():
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base.Dispose(disposing); // GOOD
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base.Dispose(); // BAD
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This is in accordance with the IDisposable pattern:
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<A HREF="http://msdn.microsoft.com/en-us/library/b1yfkh5e.aspx">http://msdn.microsoft.com/en-us/library/b1yfkh5e.aspx</A>
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- Jon
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[0] I have no idea if it's _the_ cause, but it's certainly _a_ cause. I'm always interested in further repros.
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