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A KDL (short for Kernel Debug(ger) Land) is a term used on BeOS/Haiku and possibly other operating systems for a serious kernel error which causes the computer to drop into the kernel debugger.
While a KDL brought about by a buggy driver which is not crucial, such as a filesystem driver, can be escaped from (with the command 'es'), it usually leaves the user needing to reboot.
The Kernel Debug(ger) Land can also be entered on BeOS/Haiku at any time by pressing Alt-SysReq-D on the keyboard while the system is running. [1]
BeOS is an operating system for personal computers first developed by Be Inc. in 1990. It was first written to run on BeBox hardware.
Mach is a kernel developed at Carnegie Mellon University by Richard Rashid and Avie Tevanian to support operating system research, primarily distributed and parallel computing. Mach is often considered one of the earliest examples of a microkernel. However, not all versions of Mach are microkernels. Mach's derivatives are the basis of the operating system kernel in GNU Hurd and of Apple's XNU kernel used in macOS, iOS, iPadOS, tvOS, and watchOS.
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Haiku is a free and open-source operating system capable of running applications written for the now-discontinued BeOS, which it is modeled after. Its development began in 2001, and the operating system became self-hosting in 2008. The first alpha release was made in September 2009, and the last was November 2012; the first beta was released in September 2018, followed by beta 2 in June 2020, then beta 3 in July 2021. The fourth beta was released on December 23, 2022, still keeping BeOS 5 compatibility in its x86 32-bit images, with a greatly increased number of modern drivers, GTK3 apps and Wine ported, as well as Xlib (X11) and Wayland compatibility layers.
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The Blue Screen of Death (BSoD), Blue screen error, Blue Screen, fatal error, or bugcheck, and officially known as a Stop error, is a critical error screen displayed by the Microsoft Windows or ReactOS operating systems in the event of a fatal system error.
The kernel is a computer program at the core of a computer's operating system and generally has complete control over everything in the system. It is the portion of the operating system code that is always resident in memory and facilitates interactions between hardware and software components. A full kernel controls all hardware resources via device drivers, arbitrates conflicts between processes concerning such resources, and optimizes the utilization of common resources e.g. CPU & cache usage, file systems, and network sockets. On most systems, the kernel is one of the first programs loaded on startup. It handles the rest of startup as well as memory, peripherals, and input/output (I/O) requests from software, translating them into data-processing instructions for the central processing unit.
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KDL is a kernel error on operating systems such as BeOS/Haiku.
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