Incident: MacOS Monterey Upgrade Bricks Some Mac Computers.

Published Date: 2021-11-11

Postmortem Analysis
Timeline 1. The software failure incident with the MacOS Monterey upgrade happened a few days before the article was published on 2021-11-11 [121412]. Therefore, the incident likely occurred in early November 2021.
System 1. T2 security chip in Macs [121412]
Responsible Organization 1. Users who installed the new MacOS Monterey upgrade [121412] 2. Apple, as the developer of the operating system [121412]
Impacted Organization 1. Users who installed the MacOS Monterey upgrade on their Macs experienced issues such as their computers refusing to boot up, ports not working, and getting stuck in a loop of trying to update [121412].
Software Causes 1. The software causes of the failure incident with the MacOS Monterey upgrade were related to issues with the T2 security chip, as mentioned by tech reporter Rene Ritchie in a statement from Apple [121412].
Non-software Causes 1. The issue was related to the T2 security chip in the Macs [121412].
Impacts 1. Some users reported that their Mac computers completely shut down and refused to boot up after installing the MacOS Monterey upgrade [121412]. 2. Users experienced issues such as non-functional ports and getting stuck in a loop of trying (but failing) to update their MacBook after the upgrade [121412].
Preventions To prevent the software failure incident where some users experienced issues with the MacOS Monterey upgrade, the following measures could have been taken: 1. Conducting thorough compatibility testing with different hardware configurations to ensure a smooth upgrade process [121412]. 2. Implementing robust quality assurance processes to identify and address potential issues before the software release [121412]. 3. Providing clear and detailed instructions to users on how to prepare for and execute the upgrade, including the importance of backing up data [121412]. 4. Promptly addressing user-reported issues and communicating transparently about the nature of the problem and the steps being taken to resolve it [121412].
Fixes 1. The software failure incident related to the MacOS Monterey upgrade, which caused some Macs to shut down, could be fixed by installing a recent update that addresses the issue, particularly related to the T2 security chip [121412].
References 1. Users who reported their Macs shutting down after installing MacOS Monterey [121412] 2. Tech reporter Rene Ritchie who tweeted a statement from Apple regarding the issue [121412]

Software Taxonomy of Faults

Category Option Rationale
Recurring one_organization (a) The software failure incident related to the MacOS Monterey upgrade causing issues with Mac computers is not the first time such problems have occurred with Apple's operating system updates. Users faced similar issues with last year's launch of MacOS Big Sur, indicating a recurring pattern of software failures within the same organization [121412].
Phase (Design/Operation) design, operation (a) The software failure incident related to the design phase is evident in the article as users faced issues with the new MacOS Monterey upgrade. Some users reported that their computers refused to boot up after installing Monterey, while others mentioned problems with ports not working or their MacBook getting stuck in a loop during the update process. These issues indicate that there were contributing factors introduced during the system development or update process that led to the failures experienced by users [121412]. (b) The software failure incident related to the operation phase is also highlighted in the article. Users encountered issues such as their Macs completely shutting down, ports not working, and laptops getting stuck in update loops. These problems were a result of the operation or use of the system after the upgrade to MacOS Monterey. The failures experienced by users during the operation of the system point to contributing factors introduced by the operation or misuse of the system [121412].
Boundary (Internal/External) within_system (a) within_system: The software failure incident related to the MacOS Monterey upgrade causing Macs to shut down, ports not working, and laptops getting stuck in update loops was attributed to an issue with the T2 security chip within the system. Apple acknowledged the problem and released a fix for it in a recent update, indicating that the root cause of the failure originated from within the system itself [121412]. (b) outside_system: There is no specific mention in the article about the software failure incident being caused by contributing factors originating from outside the system.
Nature (Human/Non-human) non-human_actions, human_actions (a) The software failure incident related to non-human actions was caused by a problem with the T2 security chip in the new MacOS Monterey upgrade. Users reported that their Macs completely shut down or experienced issues with ports and updates after installing Monterey. Apple later acknowledged the issue and stated that it was related to the T2 security chip, which had been fixed in a recent update [121412]. (b) The software failure incident related to human actions involved users who faced issues with their Macs after installing the new MacOS Monterey upgrade. This highlights the importance of backing up your computer before installing major updates, especially new operating systems, to prevent potential problems like the ones experienced by some users [121412].
Dimension (Hardware/Software) hardware, software (a) The software failure incident related to hardware: - The article mentions that some users reported that their Mac computers refused to boot up after installing the MacOS Monterey upgrade, with others reporting that the ports no longer worked or that their MacBook got stuck in a loop of trying (but failing) to update [121412]. - The issue was specifically related to the T2 security chip in the Macs, which is a hardware component, and Apple mentioned that the problem had been fixed in a recent update [121412]. (b) The software failure incident related to software: - The article highlights that users faced issues with the MacOS Monterey upgrade, indicating that the failure originated in the software update itself [121412]. - It is mentioned that the issue with the T2 security chip causing the shutdown of Macs was related to the software update, as Apple released a fix for it in a recent update [121412].
Objective (Malicious/Non-malicious) non-malicious (a) The software failure incident related to the MacOS Monterey upgrade causing Macs to shut down, ports not working, and laptops getting stuck in update loops was non-malicious. The issue was related to the T2 security chip and was fixed in a recent update, according to a statement from Apple shared by tech reporter Rene Ritchie [121412].
Intent (Poor/Accidental Decisions) poor_decisions (a) The software failure incident related to the MacOS Monterey upgrade causing issues with some Macs can be attributed to poor_decisions. This is evident from the fact that users faced similar issues with the previous MacOS Big Sur launch, indicating a pattern of recurring problems with major updates [121412]. Additionally, the failure was related to the T2 security chip, suggesting a design or implementation flaw that led to the issue, which could be considered a poor decision in the development process.
Capability (Incompetence/Accidental) accidental (a) The software failure incident related to development incompetence is not explicitly mentioned in the provided article [121412]. (b) The software failure incident related to accidental factors is highlighted in the article. Users reported issues with their Macs after installing the new MacOS Monterey upgrade, such as computers refusing to boot up, ports not working, and MacBooks getting stuck in a loop of trying to update but failing. Apple later acknowledged that the issue was related to the T2 security chip and had been fixed in a recent update, indicating that the failure was accidental rather than intentional [121412].
Duration temporary (a) The software failure incident related to the MacOS Monterey upgrade causing Macs to completely shut down was temporary. The issue was specifically related to the T2 security chip and had been fixed in a recent update, as mentioned in a statement from Apple shared by tech reporter Rene Ritchie [121412].
Behaviour crash (a) crash: The software failure incident described in the article is related to a crash. Users reported that their Mac computers refused to boot up after installing the MacOS Monterey update, indicating a failure of the system to perform any of its intended functions [121412]. (b) omission: There is no specific mention of the software failure incident being related to omission in the article. (c) timing: The software failure incident is not related to timing issues where the system performs its intended functions but at the wrong time. (d) value: The software failure incident is not related to the system performing its intended functions incorrectly. (e) byzantine: The software failure incident is not related to the system behaving erroneously with inconsistent responses and interactions. (f) other: The behavior of the software failure incident is not described in the options (a) to (e).

IoT System Layer

Layer Option Rationale
Perception None None
Communication None None
Application None None

Other Details

Category Option Rationale
Consequence property The consequence of the software failure incident related to the MacOS Monterey upgrade issue was primarily in the category of (d) property. Users reported that their Mac computers either completely shut down, refused to boot up, had non-functional ports, or got stuck in a loop after installing the Monterey upgrade. This resulted in a direct impact on their material goods (computers) and data. Apple acknowledged the issue related to the T2 security chip and released a fix in a subsequent update [121412].
Domain information (a) The software failure incident mentioned in the article is related to the information industry as it involves the installation of a new operating system, MacOS Monterey, which caused issues for some users, such as their Macs shutting down, ports not working, and laptops getting stuck in update loops [121412]. This incident highlights the importance of backing up computers before installing major updates, especially new operating systems, to prevent potential issues in the information industry.

Sources

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