On Tue, Aug 01, 2006 at 10:40:11PM +0200, Karol Lewandowski wrote: > Hi, > > I'm getting reproductible kernel panic when I use smaller SLOB > allocator (instead of SLAB). This is reproductible but very randomly > -- sometimes it happens during bootup, sometimes few minutes later. > > Hardware is custom board with IBM405EP (very close to Bubingna, just > no RTC): > > # cat /proc/cpuinfo > processor : 0 > cpu : 405EP > clock : 200MHz > revision : 9.80 (pvr 5121 0950) > bogomips : 199.47 > machine : MagicBox > plb bus clock : 100MHz > pci bus clock : 25MHz > > Enabling SLAB instead of SLOB fixes this, so I assume this is driver > issue.
This is probably the same issue I had with SLAB debugging. In short, those allocators aren't compatible with non-coherent cache archs (like 4xx), because driver assumes at least L1 cache line alignment for all allocated memory. For more info, you can read this post: http://ozlabs.org/pipermail/linuxppc-embedded/2006-February/022087.html -- Eugene
