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- @BEGIN_FILE_ID.DIZANOTHER bug found in Penitum/MMX. Intel are
- soo lame!
- @END_FILE_ID.DIZ
-
- Intel confirms Pentium "F0" bug - from News.com
-
- November 10, 1997, 6:45 p.m. PT Intel (INTC) today confirmed that a bug can
- crash its Pentium processors, and the chip giant was rushing to come up with a
- fix. Intel acknowledged the "F0" bug this afternoon, saying that it is now
- looking into a work-around. A spokesperson said the company would know more
- about the work-around "within a week." Though completely different in nature,
- the F0 bug evokes memories of a calculation glitch in the Pentium found by a
- mathematics professor back in 1994, which cost Intel close to $500 million
- dollars. "Yes, we are confirming this is an errata. This was not on our
- published list of [processor bugs]. We didn't know it existed until Friday,"
- the spokesperson said today. Intel publishes a list of Pentium, Pentium Pro,
- and Pentium II bugs. These problems, referred to as "errata," are supposed to
- cover all known bugs.
-
- The bug was first reported by CNET's NEWS.COM Friday afternoon. Intel is an
- investor in CNET: The Computer Network. The Pentium F0 bug affects Pentium MMX
- and "classic" Pentium (non-MMX) computers, machines that number in the hundreds
- of millions worldwide. A computer affected by the bug stops operating--a
- so-called "freeze-up." A "ctrl-alt-delete" keyboard operation, which can
- generally be used for "rebooting" a computer, will not work. The computer must
- be re-started. The bug should not affect ordinary computer users since the
- offending instruction is not something that appears in software that people
- install on their PCs. Someone has to intentionally and maliciously execute a
- program with this instruction on a computer. Intel confirmed that the bug
- occurs only when the processor receives an illegal, one-line instruction. "The
- result is the system could freeze," Intel said. "This bug will not be found in
- commercial software," Intel added. The bug does not affect Pentium Pro or
- Pentium II processors. Nathan Brookwood, an analyst at marketing research firm
- Dataquest, said the bug is similar to glitch found in the IBM 790 computer back
- in the early 1960s. In that case, a single errant instruction was able to bring
- down an IBM computer. "This is dangerous if you're in a multiuser environment.
- If somebody does it to himself, fine. I don't care. But if somebody takes a
- bomb onto a plane I'm flying on, then I care," he said. One interesting aspect
- of the bug is that, in the case of a system crash, the processor is actually
- still running. This may allow Intel to "discover the state" of the processor
- and thereby come up with a software fix, Brookwood said. "They may be able to
- set up an error-handling condition...That's what they are working on now within
- Intel and with key operating system suppliers," he said. Brookwood said the
- strategy will probably be to go to operating system vendors and say, "Here's the
- problem and here's the work-around, and go figure out how to implement it."
-