ATA identify retries exceeded - kernel panic

[Thomas E. Spanjaard]

Matthew Dillon wrote:
:> kernel: type 12 trap, code=2
:> Stopped at     ad_interrupt+x038a: movl   %eax,0x148(%edx)
Fwiw, I haven't seen such yet with the new ATA code, except in the case 
when I forgot to zero the structs I pulled out of my objcache. It might 
be nice to have objcache_get() look at oc_flags and zero if & M_ZERO.

In any case, I got that panic because I didn't have a zeroed struct, so 
a certain variable was set where it shouldn't have been, resulting in 
other code kfree()-ing another struct, thereby making a pointer in that 
struct point to 0xdeadc0de (the slab alloc does this). If that's the 
case, we need to look for inadvertent frees.

Cheers,
--
        Thomas E. Spanjaard
        tgen at xxxxxxxxxxxxx
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