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SubjectRe: st corruption with 2.4.3-pre4


On Thu, 5 Apr 2001, Geert Uytterhoeven wrote:

>
> BTW, my 2.4.3-pre8 kernel just said
>
> | sym53c875-0:0: ERROR (81:0) (3-21-0) (10/9d) @ (script 8a8:0b000000).

Illegal instruction detected.

> | sym53c875-0: script cmd = 11000000
> | sym53c875-0: regdump: da 10 80 9d 47 10 00 0d 00 03 80 21 80 01 09 09 00 30 4e 00 08 ff ff ff.
> | sym53c875-0-<0,*>: FAST-20 WIDE SCSI 40.0 MB/s (50.0 ns, offset 16)
>
> during the boot process, and continued without problems. What does this mean?

Looks extremally serious to me.

The SCRIPTS processor should be fetching CHMOV DSA relative when DATA_IN
instructions. This corresponds to opcode 0x11000000.

However, it seems to have fetched instruction 0x0b000000 which is a
MOVE ABSOLUTE WHEN STATUS PHASE.

In (3-21-0) we can see that the chip is expecting STATUS PHASE (3), but
the target is driving DATA IN phase (21 - the 1 indicates DATA IN phase).

In other word, the SCRIPTS processor seems to have fetched a bogus
instruction. The signaled 'illegal instruction detected' may be due to the
count of bytes to transfer to be zero.

> Gr{oetje,eeting}s,

Gérard.

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