Debugging "No Smoking" sign boot failures

Subject: Debugging "No Smoking" sign boot failures
From: Dave Dribin <email@hidden>
Date: Fri, 18 Jul 2008 10:15:53 -0500
Delivered-to: email@hidden
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Hi all,

When a Mac boots up, and you get the "No Smoking" (circle with a slash through it), what exactly does that mean?

A client of mine has been seeing occasional booting failures if their software is installed. It is a boot time kext with OSBundleRequired set to Root. Is it possible for a kext to cause this kind of boot failure? I figured that error was coming from EFI before the kernel even started to boot.

Also, any suggestions on how to debug the issue? If I enable verbose boot, it all boots fine.

FWIW, this problem seems to be hardware specific, meaning they have a bunch of machines (allegedly these are the same hardware and OS). The problem always seems to manifest itself on the same machines, i.e. there are some machines that never exhibit the problem.

-Dave

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