Blue screen of death

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The Blue Screen of Death in Windows Me. Windows 9X BSOD.png
The Blue Screen of Death in Windows Me.

The blue screen of death (also known as BSoD, blue screen error, blue screen, fatal error or bugcheck and officially known as a stop error [1] [2] [3] ) is a critical error screen displayed by the Microsoft Windows and ReactOS operating systems in the event of a fatal system error. It indicates a system crash, in which the operating system has reached a critical condition where it can no longer operate safely.

Contents

Possible issues that can cause a BSoD include hardware failures, an issue with or without a device driver, or unexpected termination of a crucial process or thread.

History

The boot screen of Windows 1.01/2.03 filled with random characters due to an incorrect DOS version. BSoD in Windows 1.0.png
The boot screen of Windows 1.01/2.03 filled with random characters due to an incorrect DOS version.
External videos
YouTube Logo 2017.svg
Videos of the boot screen on Windows 1.01 filled with random characters due to an incorrect DOS version.
Nuvola apps kaboodle.svg Windows 1.0 BSOD (Incorrect DOS Version): Short version, showing a failed Windows startup.
Nuvola apps kaboodle.svg Windows 1.01 Blue Screen of Death: Long version, showing installation of MS-DOS 6 and Windows 1.01, and the failed startup of Windows 1.01.

An early blue error screen first existed in the Beta Release of Windows 1.0; if Windows found a different DOS version than it expected, the error message "Incorrect DOS version" alongside other text messages detailing what check failed to pass would be appended to the boot screen before starting normally. [4] This function still exists in the final release (version 1.01); however, this screen prints out random characters after the "Incorrect DOS version" text as a result of a bug in the Windows logo code after the other text messages were removed. [4] This is not a crash screen, however; upon crashing, Windows 1.0 either locks up or exits to DOS. Windows 2.0 and Windows 2.1 mirrors Windows 1.0 as they share the same boot screen as well as exiting to DOS upon crashing or if a critical error occurs.

Windows 3.0 uses a text-mode screen for displaying important system messages, usually from digital device drivers in 386 Enhanced Mode or other situations where a program could not run. Windows 3.1 changed the color of this screen from black to blue. Windows 3.1 also displays a blue screen when the user presses the Ctrl+Alt+Delete key combination while no programs are unresponsive to bring up a rudimentary task manager (the reverse is true for when there are unresponsive programs). As with prior versions, Windows 3.x exits to DOS if an error condition is severe enough.

The original Blue Screen of Death first appeared in Windows NT 3.1. This is from Windows NT 3.51 (Italian localization). Windows NT 3.51 BSOD ita.png
The original Blue Screen of Death first appeared in Windows NT 3.1. This is from Windows NT 3.51 (Italian localization).

The first Blue Screen of Death appeared in Windows NT 3.1 [5] (the first version of the Windows NT family, released in 1993), and later appeared on all Windows operating systems released afterwards. In its first iteration, the error screens started with *** STOP:, hence it became known as a "stop error."

BSoDs can be caused by poorly written device drivers or malfunctioning hardware, [6] such as faulty memory, power supply issues, overheating of components, or hardware running beyond its specification limits. In the Windows 9x operating systems, incompatible DLLs or bugs in the operating system kernel could also cause BSoDs. [7] Because of the instability and lack of memory protection in Windows 9x OSes, BSoDs were much more common.

Contrary to popular belief, the Windows Embedded Compact (formerly known as Windows CE) line of embedded operating systems do not use the Blue Screen of Death. [8]

Attribution

The rudimentary task manager screen from Windows 3.1x, often confused with the Blue Screen of Death due to its similarities. Windows 3.1 BSoD (fixed).png
The rudimentary task manager screen from Windows 3.1x, often confused with the Blue Screen of Death due to its similarities.

On September 4, 2014, several online journals, including Business Insider , [9] DailyTech , [10] Engadget , [11] Gizmodo , [12] Lifehacker , [13] Neowin , [14] Softpedia , [15] TechSpot, [16] The Register , [17] and The Verge [18] incorrectly attributed the creation of the Blue Screen of Death to Steve Ballmer, Microsoft's former CEO, citing an article by Microsoft employee Raymond Chen, entitled "Who wrote the text for the Ctrl+Alt+Del dialog in Windows 3.1?". [19] The article focused on the creation of the first rudimentary task manager in Windows 3.x which shared visual similarities with a BSoD, with Steve Ballmer writing the messages that had appeared on them. [19] In a follow-up on September 9, 2014, Raymond Chen complained about this widespread mistake, claimed responsibility for revising the BSoD in Windows 95 and panned BGR.com for having "entirely fabricated a scenario and posited it as real". [20]

According to former Microsoft employee David Plummer, the Blue Screen of Death (also known as a Stop error) in the Windows NT family was actually designed by Microsoft developer John Vert and was not inspired by the rudimentary task manager screen of Windows 3.x. [21] Additionally, John Vert stated that the Stop error screens were assigned the color blue because the universal color palette of the video hardware at that time was very rudimentary and he personally used a MIPS OS box and SlickEdit for programming, so that the firmware and editor both displayed white text on a blue background, making it for a more consistent programming experience. [21]

Formats

BSoDs originally showed silver text on a royal blue background with information about current memory values and register values. Starting with Windows Server 2012 (released in September 2012), Windows adopted a cerulean background. Windows 11 initially used a black background, but starting from build number 22000.348, [22] switched to a dark blue background. [23] Preview builds of Windows 10, Windows 11, and Windows Server (available from the Windows Insider program) feature a dark green background instead of a blue one. [24] [25] [22] Windows 3.1, 95, and 98 supports customizing the color of the screen, [26] whereas in the Windows NT family, the color is hard-coded. [26]

Windows 95, 98 and Me render their BSoDs in the 80×25 text mode. BSoDs in the Windows NT family initially used the 80×50 text mode on a 720×400 screen. Windows 2000, Windows XP, Vista, and 7 BSoDs use the 640×480 screen resolution. Windows 2000 used its built-in kernel mode font, Windows XP, Vista, and 7 use the Lucida Console font, and Windows 8 and Windows Server 2012 used the Segoe UI font. BSoDs on Windows 8 and Windows Server 2012 are rendered in higher resolutions than previous versions of Windows, where on UEFI machines, the BSoDs use the highest screen resolution available. On legacy BIOS machines, they use the 1024×768 resolution by default, but they can also be configured to use the highest resolution available (via the 'highestmode' parameter in Boot Configuration Data). [27] Windows 10 builds 14316 and up uses the same format as Windows 8, but has a QR code which leads to a Microsoft Support web page that tries to help users troubleshoot the issue step-by-step.

Windows NT

The Blue Screen of Death in Windows 2000. 029-bsod Windows 2000.png
The Blue Screen of Death in Windows 2000.
The Blue Screen of Death in Windows XP, Windows Vista and Windows 7, as well as Windows Server operating systems such as Windows Server 2003, Windows Server 2008 and Windows Server 2008 R2. Windows XP BSOD.png
The Blue Screen of Death in Windows XP, Windows Vista and Windows 7, as well as Windows Server operating systems such as Windows Server 2003, Windows Server 2008 and Windows Server 2008 R2.
The "Fatal System Error" Blue Screen of Death in Windows XP, Windows Vista and Windows 7, as well as Windows Server operating systems such as Windows Server 2003, Windows Server 2008 and Windows Server 2008 R2.
This type of Blue Screen of Death originated in Windows NT 3.1, with Windows 2000 and XP-7 using different display fonts for the error screen. Windows c000021a Fatal Error.png
The "Fatal System Error" Blue Screen of Death in Windows XP, Windows Vista and Windows 7, as well as Windows Server operating systems such as Windows Server 2003, Windows Server 2008 and Windows Server 2008 R2.
This type of Blue Screen of Death originated in Windows NT 3.1, with Windows 2000 and XP-7 using different display fonts for the error screen.
The Blue Screen of Death in Windows 8, Windows 8.1 and Windows 10 (RTM-1511), which includes a sad emoticon alongside an error code.
The "Fatal System Error" Blue Screen Of Death on these OSes and the ones after it used the same design as the main one, except with the error code "0xc000021a" in place of the error name. BSOD Windows 8.png
The Blue Screen of Death in Windows 8, Windows 8.1 and Windows 10 (RTM–1511), which includes a sad emoticon alongside an error code.
The "Fatal System Error" Blue Screen Of Death on these OSes and the ones after it used the same design as the main one, except with the error code "0xc000021a" in place of the error name.
The Blue Screen of Death in Windows 10 (1607 onwards) and Windows 11, which includes a sad emoticon, an error code and a QR code for quick troubleshooting. The word "PC" was changed to "device" starting with version 2004 onwards. A different shade of blue is used in Windows 11 builds since 22000.348. Bsodwindows10.png
The Blue Screen of Death in Windows 10 (1607 onwards) and Windows 11, which includes a sad emoticon, an error code and a QR code for quick troubleshooting. The word "PC" was changed to "device" starting with version 2004 onwards. A different shade of blue is used in Windows 11 builds since 22000.348.
The Blue Screen of Death in Windows 11 builds prior to 22000.348, which uses an all-black screen except for the QR code, which remained in blue. Windows11BSOD.jpg
The Blue Screen of Death in Windows 11 builds prior to 22000.348, which uses an all-black screen except for the QR code, which remained in blue.

In the Windows NT family of operating systems, the blue screen of death (referred to as "bug check" in the Windows software development kit and driver development kit documentation) occurs when the kernel or a driver running in kernel mode encounters an error from which it cannot recover. This is usually caused by an illegal operation being performed. The only safe action the operating system can take in this situation is to restart the computer. Because of this, data loss may occur since the restart is unplanned, and the user isn't given an opportunity to save their work.

The text on the error screen contains the code of the error and its symbolic name (e.g. "0x0000001E, KMODE_EXCEPTION_NOT_HANDLED") along with four error-dependent values in parentheses that are there to help software engineers fix the problem that occurred. Depending on the error code, it may display the address where the problem occurred, along with the driver which is loaded at that address. Under Windows NT, the second and third sections of the screen may contain information on all loaded drivers and a stack dump, respectively. The driver information is in three columns; the first lists the base address of the driver, the second lists the driver's creation date (as a Unix timestamp), and the third lists the name of the driver. [28] By default, Windows will create a memory dump file when a stop error occurs. Depending on the OS version, there may be several formats this can be saved in, ranging from a 64kB "minidump" (introduced in Windows 2000) to a "complete dump" which is effectively a copy of the entire contents of physical memory (RAM). The resulting memory dump file may be debugged later, using a kernel debugger. For Windows, WinDBG or KD debuggers from Debugging Tools for Windows are used. [29] A debugger is necessary to obtain a stack trace, and may be required to ascertain the true cause of the problem; as the information on-screen is limited and thus possibly misleading, it may hide the true source of the error. By default, Windows XP is configured to save only a 64kB minidump when it encounters a stop error, and to then automatically reboot the computer. Because this process happens very quickly, the blue screen may be seen only for an instant or not at all. Users have sometimes noted this as a random reboot rather than a traditional stop error, and are only aware of an issue after Windows reboots and displays a notification that it has recovered from a serious error. This happens only when the computer has a function called "Auto Restart" enabled, which can be disabled in the Control Panel which in turn shows the stop error.

Microsoft Windows can also be configured to send live debugging information to a kernel debugger running on a separate computer. If a stop error is encountered while a live kernel debugger is attached to the system, Windows will halt execution and cause the debugger to break in, rather than displaying the BSoD. The debugger can then be used to examine the contents of memory and determine the source of the problem.

A BSoD can also be caused by a critical boot loader error, where the operating system is unable to access the boot partition due to incorrect storage drivers, a damaged file system or similar problems. The error code in this situation is STOP: 0x0000007B (INACCESSIBLE_BOOT_DEVICE). [30] In such cases, there is no memory dump saved. Since the system is unable to boot from the hard drive in this situation, correction of the problem often requires using the repair tools found on the Windows installation disc.

Details

The Blue Screen of Death in Windows Server 2012, Server 2016 Technical Preview 4 and Windows 8.x (Japanese Language), Note that the sad emoticon is absent. Windows-Server-2012-2016TP4-BSoD.png
The Blue Screen of Death in Windows Server 2012, Server 2016 Technical Preview 4 and Windows 8.x (Japanese Language), Note that the sad emoticon is absent.

Before Windows Server 2012, each BSoD displayed an error name in uppercase (e.g. APC_INDEX_MISMATCH), a hexadecimal error number (e.g. 0x00000001) and four parameters. The last two are shown together in the following format: [31]

error code (parameter 1, parameter 2, parameter 3, parameter 4) error name

Depending on the error number and its nature, all, some, or even none of the parameters contain data pertaining to what went wrong, and/or where it happened. In addition, the error screens showed four paragraphs of general explanation and advice and may have included other technical data such the file name of the culprit and memory addresses.

With the release of Windows Server 2012, the BSoD was changed, removing all of the above in favor of the error name and a concise description. Windows 8 also added a sad-emoticon as well (except on the Japanese versions or Windows Server releases [32] ). The hexadecimal error code and parameters can still be found in the Windows Event Log or in memory dumps. The only exception to this rule was the "Fatal System Error" BSoDs, which had the hexadecimal error code "0xc000021a" in place of the error name.

Since Windows 10 build 14316, the screen features a QR code for quick troubleshooting. In Windows 10 version 2004 onwards and Windows 11, the text on the BSoD was slightly changed, with the text "Your PC ran into a problem" being reworded as "Your device ran into a problem".

Windows 9x

The Blue Screen of Death in Windows 9x, as it appears on Windows 95 and Windows 98. ConCon bsod.png
The Blue Screen of Death in Windows 9x, as it appears on Windows 95 and Windows 98.

The Windows 9x line of operating systems used the Blue Screen of Death as the main way for virtual device drivers to report errors to the user. This version of the BSoD, internally referred to as "_VWIN32_FaultPopup", gives the user the option either to restart the computer or to continue using Windows. However, depending on the type of situation, this may or may not work at all. This behavior is in contrast with the Windows NT versions of the BSoD, which prevents the user from using the computer until it has been powered off or restarted (usually automatic).

The most common BSoD is displayed on an 80×25 text-mode screen, which is the operating system's way of reporting an interrupt caused by a processor exception; it is a more serious form of the general protection fault dialog boxes. The memory address of the error is given and the error type is a hexadecimal number from 00 to 11 (0 to 17 decimal). The error codes are as follows: [33]

Reasons for BSoDs include:

In Windows 95 and 98, a BSoD occurs when the system attempts to access the file "c:\con\con", "c:\aux\aux", or "c:\prn\prn" on the hard drive. This could be inserted on a website to crash visitors' machines as a prank. In reality, however, they are reserved device names for DOS systems. Attempting to access them from Windows causes a crash, which in turn brings up said BSoD. Creating the aforementioned directories within Windows will also produce the same problem. On March 16, 2000, Microsoft released a security update to resolve this issue. [34]

One famous instance of a Windows 9x BSoD occurred during a presentation of a Windows 98 beta given by Bill Gates at COMDEX on April 20, 1998: The demo PC crashed with a BSoD when his assistant, Chris Capossela, connected a scanner to the PC to demonstrate Windows 98's support for Plug and Play devices. This event brought thunderous applause from the crowd and Gates replied (after a nervous pause): "That must be why we're not shipping Windows 98 yet." [35]

Linux

systemd, a software suite providing system components for the Linux operating systems, implements a blue screen of death similar to those of Microsoft Windows using a systemd unit called systemd-bsod since August 2023, which was fully added on December 6, 2023 starting with version 255 of systemd. [36] It does not replace the kernel panic featured within Linux (see below); rather, it is only used in the event of a boot failure. [37]

Similar screens

The Red Screen of Death in a post-reset Windows Longhorn build. Note that the word "execution" is misspelt as "exectuion", which was fixed in a later build. Longhorn RSoD.png
The Red Screen of Death in a post-reset Windows Longhorn build. Note that the word "execution" is misspelt as "exectuion", which was fixed in a later build.

Stop errors are comparable to kernel panics in macOS, Linux, and other Unix-like systems, and to bugchecks in OpenVMS. Windows 3.1 display a Black Screen of Death instead of a blue one. [20] Some versions of macOS (notably OS X Lion) display a Black Screen of Death instead of a kernel panic, usually pointed to a graphics card or sleep/wake issue. [38] The Xbox series of consoles (which includes the original Xbox, Xbox 360, Xbox One and the Xbox Series X/S) also display a Black Screen of Death upon hardware or software error. [39] Beta versions of Windows 98 display a red error screen raised by the Advanced Configuration and Power Interface (ACPI) when the host computer's BIOS encounters a problem. [40] The bootloader of the first beta version of Windows Vista also display a red error screen in the event of a boot failure. [41] [42] [43] Windows 10 and later display an Orange Screen of Death when there is a driver incompatibility present.[ citation needed ]

As mentioned earlier, the insider builds of Windows Server 2016 and later, Windows 10, and Windows 11 display a green screen. [24] [25] [22]

See also

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