INT 0A P - CPU-generated (80286+) - INVALID TASK STATE SEGMENT
Desc:   automatically called during a task switch if the new TSS specified by
the task gate is invalid for any of the following reasons:
TSS limit is less than 43 (80286) or 103 (80386/80486)
LDT selector invalid or segment not present
null SS selector, or SS selector outside LDT/GDT limit
stack segment is read-only
stack segment DPL differs from new CPL, or RPL <> CPL
CS selector is outside LDT/GDT limit or not code
non-conforming code segment's DPL differs from CPL
conforming code segment's DPL > CPL
DS/ES selectors outside LDT/GDT limit or not readable segments
Note:   the handler must use a task gate in order to have a valid TSS under
which to execute; it must also reset the busy bit in the new TSS

See also: 0B

0A - CPU-generated (80286+) - INVALID TASK STATE SEGMENT