> From: David Miller <davem@xxxxxxxxxxxxx> > Date: Sat, 11 Oct 2014 22:15:10 -0400 (EDT) > > > > > I'm getting tons of the following on sparc64: > > > > [603965.383447] Kernel unaligned access at TPC[546b58] free_block+0x98/0x1a0 > > [603965.396987] Kernel unaligned access at TPC[546b60] free_block+0xa0/0x1a0 > > [603965.410523] Kernel unaligned access at TPC[546b58] free_block+0x98/0x1a0 > In all of the cases, the address is 4-byte aligned but not 8-byte > aligned. And they are vmalloc addresses. > > Which made me suspect the percpu commit: > > ==================== > commit bf0dea23a9c094ae869a88bb694fbe966671bf6d > Author: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > Date: Thu Oct 9 15:26:27 2014 -0700 > > mm/slab: use percpu allocator for cpu cache > ==================== > > And indeed, reverting this commit fixes the problem. I tested Joonsoo Kim's fix and it gets rid of the kernel unaligned access messages, yes. But the instability on UltraSparc II era machines still remains - occassional Bus Errors during kernel compilation, messages like this: sh[11771]: segfault at ffd6a4d1 ip 00000000f7cc5714 (rpc 00000000f7cc562c) sp 00000000ffd69d90 error 30002 in libc-2.19.so[f7c44000+16a000] -- Meelis Roos (mroos@xxxxxxxx) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>