Virtualbox-4.0.0-69151-OSX.dmg fails to install, but installs anyway?

[Penelope Fudd]

This MacOSX Snowleopard 10.6.6 (just updated) system had VirtualBox-3.2.4-62467-OSX.dmg installed, and today I attempted to upgrade to VB 4.0.0-69151. Downloaded the dmg, opened it, double-clicked on VirtualBox.mpkg, clicked next,next,next until it got to the last step (Summary), where it said:

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There were errors with the installation. You may want to try installing again.

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The installation failed.

The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

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In /var/log/system.log, I found this: Jan 14 10:17:51 shechinah VirtualBoxVM[364]: VirtualBoxVM(364,0x111901000) malloc: * error for object 0x10380ce08: incorrect checksum for freed object - object was probably modified after being freed.\n* set a breakpoint in malloc_error_break to debug Jan 14 10:17:55 shechinah ReportCrash[367]: Saved crash report for VirtualBoxVM[364] version 3.2.4 (3.2.4) to /Library/Logs/DiagnosticReports/VirtualBoxVM_2011-01-14-101755_shechinah.crash

I've attached the crash report.

However, when I started VB to report what version I was upgrading from, it claimed 4.0.0!

This successful "failure" is not the way things are supposed to work; it makes the product look bad.

[Penelope Fudd]

Crash log of installation program for VirtualBox4.0.0-69151-OSX.dmg

[Frank Mehnert]

According to your messages it looks like your previous version was VirtualBox 3.2.4, is that correct?

[Penelope Fudd]

Yes.

[Frank Mehnert]

Hmm, but you did not have a running VM while you updated, did you? Did the same happen when you updated from 4.0 to 4.0.2?

[Penelope Fudd]

I don't believe I had a running VM when I updated from 3.2.4 to 4.0.0. Is 4.0.2 available now? I'll have to go try it, if so.

[Penelope Fudd]

I've upgraded to 4.0.4, and the error message still occurs. No VMs were running at the time. So far, it occurs with 4.0.0, 4.0.2 and 4.0.4.