On Tue, 23 Jan 2007, Neil Brown wrote: > On Monday January 22, cebbert@xxxxxxxxxx wrote: > > Justin Piszcz wrote: > > > My .config is attached, please let me know if any other information is > > > needed and please CC (lkml) as I am not on the list, thanks! > > > > > > Running Kernel 2.6.19.2 on a MD RAID5 volume. Copying files over Samba to > > > the RAID5 running XFS. > > > > > > Any idea what happened here? > .... > > > > > Without digging too deeply, I'd say you've hit the same bug Sami Farin > > and others > > have reported starting with 2.6.19: pages mapped with kmap_atomic() > > become unmapped > > during memcpy() or similar operations. Try disabling preempt -- that > > seems to be the > > common factor. > > That is exactly the conclusion I had just come to (a kmap_atomic page > must be being unmapped during memcpy). I wasn't aware that others had > reported it - thanks for that. > > Turning off CONFIG_PREEMPT certainly seems like a good idea. > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Is this a bug that can or will be fixed or should I disable pre-emption on critical and/or server machines? Justin. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
