(cc linuxppc-dev@xxxxxxxxxxxxxxxx) On Mon, 11 Oct 2010 15:30:22 +0100 Mel Gorman <mel@xxxxxxxxx> wrote: > On Sat, Oct 09, 2010 at 04:57:18AM -0500, pacman@xxxxxxxxxxxxx wrote: > > (What a big Cc: list... scripts/get_maintainer.pl made me do it.) > > > > This will be a long story with a weak conclusion, sorry about that, but it's > > been a long bug-hunt. > > > > With recent kernels I've seen a bug that appears to corrupt random 4-byte > > chunks of memory. It's not easy to reproduce. It seems to happen only once > > per boot, pretty quickly after userspace has gotten started, and sometimes it > > doesn't happen at all. > > > > A corruption of 4 bytes could be consistent with a pointer value being > written to an incorrect location. It's corruption of user memory, which is unusual. I'd be wondering if there was a pre-existing bug which 6dda9d55bf545013597 has exposed - previously the corruption was hitting something harmless. Something like a missed CPU cache writeback or invalidate operation. How sensitive/vulnerable is PPC32 to such things? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>