Hi Neil,

The problem has gone away compiling with 3.0.4 :)
Cheers,

Beezly

On Thu, Apr 25, 2002 at 08:49:47PM +1000, Neil Brown wrote:

On Thursday April 25, beezly@beezly.org.uk wrote:

quoted

I've been trying to get my sparc64 machine to use raid1 but each time I
set up the md config with one good disk and one failed disk (so I can
get the data off the "failed" disk and into the md device before I do a
raidhotadd) I get the following oops (after ksymoops mangling)

The kernel is 2.4.19-pre7. md and raid1 are compiled as modules. If any more information is needed please don't hesitate to contact me.

That's two reports of this.  It looks to me very much like a compiler
bug.   I'm not an export on Sparc assembler, but I've just been
reading through the disassembly listing of read1_read_balance,
and at least two things look wrong:

0xc30 <raid1_read_balance+208>: sllx  %o2, 3, %g2 
0xc34 <raid1_read_balance+212>: add  %i1, 0x20, %g3
0xc38 <raid1_read_balance+216>: clr  [ %i5 + 0x3f0 ]
0xc3c <raid1_read_balance+220>: add  %g2, %o2, %g2

This is the only place that %o2 is used, and it is never
initialised.

0xbac <raid1_read_balance+76>:  add  %i5, 0x18, %o7
0xbb0 <raid1_read_balance+80>:  sllx  %o7, 3, %g2

%i5 is holding "conf". adding 0x18 gives the address of
 conf->mirrors[0]->head_position in %o7.
But then we shift %o7 left 3 places, multiplying by 8.
Multiplying an address by 8 is very unlikely to be correct.

Could you both please tell us what compiler version you are using, and
see if you can try a different one.

NeilBrown

quoted

 \|/ ____ \|/
 "@'/ .. \`@"
 /_| \__/ |_\
    \__U_/

Gotta love this!!

NeilBrown
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