![]() It is used by IBM RS/6000 systems, Mac OS on 32-bit PowerPC processors, and the Commodore Amiga as a magic debug value. 0xDEADBEEF was originally used to mark newly allocated areas of memory that had not yet been initialized-when scanning a memory dump, it is easy to see the 0xDEADBEEF. ("dead beef") is frequently used to indicate a software crash or deadlock in embedded systems. ("dead beef") is the GUID assigned to hung/dead virtual machines in Citrix XenServer. It is also the header of campaign gamesaves used in the Halo game series. Level files have less room for their signatures and use 0xBABE ("babe") instead. ("dead beaf") is part of the signature code of Jazz Jackrabbit 2 tileset files. ("dead babe") is used by IBM Jikes RVM as a sanity check of the stack of the primary thread. ("dead bad") is used by the Android libc abort() function when native heap corruption is detected. ("dead too bad") was used to mark allocated areas of memory that had not yet been initialised on Sequent Dynix/ptx systems. ![]() ("dabba doo") is the name of a blog on computer security. ("zero disease") is a flag that indicates regular boot on the GameCube and Wii consoles. In little endian this reads FEEDFACE, "Feed Face". ("face feed") is used by Mach-O to identify flat (single architecture) object files. ("cafe dude") is used by Java as a magic number for their pack200 compression. It was originally created by NeXTSTEP developers as a reference to the baristas at Peet's Coffee & Tea. It is also used by Mach-O to identify Universal object files, and by the Java programming language to identify Java bytecode class files. ("cafe babe") is used by Plan 9's libc as a poison value for memory pools. "Dog food" refers to Cisco eating its own dog food with IPv6. ("cisco dog food") used in the IPv6 address of on World IPv6 Day. ("cool off") is used by Apple in iOS crash reports, when application was killed in response to a thermal event. ("boo dead") was displayed by PA-RISC based HP 3000 and HP 9000 computers upon encountering a "system halt" (aka "low level halt"). ("beef babe") is used by the 1997 video game Frogger to detect a stack buffer overflow. ("boba babe") is used by pton as Host GUI Ack to QKit MFCC keyword detection response. ("cafe boba") is used by datp as canned return value for QKit MFCC keyword detection for Host GUI development since his colleague likes coffee (and maybe boba, too). ("bad cafe") is used by Libumem to indicate uninitialized memory area. ![]() ("bad too repeatedly") is used by Apple's iOS exception log to indicate that a VoIP application has been terminated by iOS because it resumed too frequently. ("bad food") is used by Microsoft's LocalAlloc(LMEM_FIXED) to indicate uninitialised allocated heap memory when the debug heap is used. ("baaaaaad") is used by Apple's iOS exception report to indicate that the log is a stackshot of the entire system, not a crash report. ("boobies") was likewise required by Microsoft's Hyper-V hypervisor to be used by a user of XEN as their user id. ![]() One proposal suggested changing it to 0x0DEFACED ("defaced"), but it was instead initially changed to decimal and then replaced entirely. ("big boobs") was required by Microsoft's Hyper-V hypervisor to be used by Linux guests as their "guest signature". ("BIOS food") is the value of the low bytes of last four registers on ARM PrimeCell compatible components (the component_id registers), used to identify correct behaviour of a memory-mapped component. ("a bad babe") was/is used by Microsoft's Windows 7 to trigger a debugger break-point, probably when a USB device is attached ("ate bad food") is used by Apple in iOS crash reports, when an application takes too long to launch, terminate, or respond to system events. ("forbid") was a password in some calibration consoles for developers to peer deeper into control registers outside the normal calibration memory range. ("1 bad boot" ) Multiboot header magic number. ("uber (ooba) block") is used as the magic number for the ZFS uberblock. ("office") is used as the last part of product codes ( GUID) for Microsoft Office components (visible in registry under the HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall registry key). Many computer processors, operating systems, and debuggers make use of magic numbers, especially as a magic debug value. Further information: Magic number (programming)
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