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Segmentation faults can also occur independently of page faults: illegal access to a valid page is a segmentation fault, but not an invalid page fault, and segmentation faults can occur in the middle of a page (hence no page fault), for example in a buffer overflow that stays within a page but illegally overwrites memory.
On x86 there exists an older memory management mechanism known as segmentation. If the application loads a segment register with the selector of a non-present segment (which under POSIX-compliant OSes can only be done with assembly language), the exception is generated. Some OSes used that for swapping, but under Linux this generates SIGBUS.
The operating system delays loading parts of the program from disk until the program attempts to use it and the page fault is generated. If the page is not loaded in memory at the time of the fault, then it is called a major or hard page fault. The page fault handler in the OS needs to find a free location: either a free page in memory, or a ...
11: Alignment Check Fault Reasons for BSoDs include: Problems that occur with incompatible versions of DLLs : Windows loads these DLLs into memory when they are needed by application programs; if versions are changed, the next time an application loads the DLL it may be different from what the application expects.
The following is an excerpt from the Segfault story "Man clicks Internet banner ad": [3]. For the first time in recent memory, someone actually clicked an Internet banner ad.
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The fix is to close some programs or install more physical memory. [program name] has stopped working. This message and similar ones are displayed by several operating systems when program causes a general protection fault or invalid page fault.