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    SubjectRe: discriminate single bit error hardware failure from slab corruption.
    On Thu, 2 Feb 2006, Dave Jones wrote:

    > In the case where we detect a single bit has been flipped, we spew
    > the usual slab corruption message, which users instantly think
    > is a kernel bug. In a lot of cases, single bit errors are
    > down to bad memory, or other hardware failure.
    >
    > This patch adds an extra line to the slab debug messages in those
    > cases, in the hope that users will try memtest before they report a bug.
    >
    > 000: 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
    > Single bit error detected. Possibly bad RAM. Please run memtest86.

    does memtest86 run on all $ARCHes ?
    or this is good for <large percentage>, so it's Good. :)
    Just checking; it is a good idea.

    > Signed-off-by: Dave Jones <davej@redhat.com>
    >
    > --- linux-2.6.15/mm/slab.c~ 2006-01-09 13:25:17.000000000 -0500
    > +++ linux-2.6.15/mm/slab.c 2006-01-09 13:26:01.000000000 -0500
    > @@ -1313,8 +1313,11 @@ static void poison_obj(kmem_cache_t *cac
    > static void dump_line(char *data, int offset, int limit)
    > {
    > int i;
    > + unsigned char total=0;
    > printk(KERN_ERR "%03x:", offset);
    > for (i = 0; i < limit; i++) {
    > + if (data[offset+i] != POISON_FREE)
    > + total += data[offset+i];
    > printk(" %02x", (unsigned char)data[offset + i]);
    > }
    > printk("\n");
    > @@ -1019,6 +1023,18 @@ static void dump_line(char *data, int of
    > }
    > }
    > printk("\n");
    > + switch (total) {
    > + case 0x36:
    > + case 0x6a:
    > + case 0x6f:
    > + case 0x81:
    > + case 0xac:
    > + case 0xd3:
    > + case 0xd5:
    > + case 0xea:
    > + printk (KERN_ERR "Single bit error detected. Possibly bad RAM. Please run memtest86.\n");
    > + return;
    > + }
    > }
    > #endif
    >
    > -
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    --
    ~Randy
    -
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