On Tue, Dec 22, 2015 at 10:52:37AM +0500, Artem S. Tashkinov wrote: > On 2015-12-22 10:38, Kent Overstreet wrote: > >On Tue, Dec 22, 2015 at 05:26:12AM +0000, Junichi Nomura wrote: > >>On 12/22/15 12:59, Kent Overstreet wrote: > >>> reproduced it with 32 bit pae: > >>> > >>>> 1. Exclude memory above 4G line with boot param "max_addr=4G". > >>> > >>> doesn't work - max_addr=1G doesn't work either > >>> > >>>> 2. Disable highmem with "highmem=0". > >>> > >>> works! > >>> > >>>> 3. Try booting 64bit kernel. > >>> > >>> works > >> > >>blk_queue_bio() does split then bounce, which makes the segment > >>counting based on pages before bouncing and could go wrong. > >> > >>What do you think of a patch like this? > > > >Artem, can you give this patch a try? > > > This patch ostensibly fixes the issue - at least I cannot immediately > reproduce it. You can count me in as "Tested-by: Artem S. Tashkinov" Let's all contemplate the fact that blk_segment_map_sg() _overrunning the end of the provided sglist_ was this much of a clusterfuck to debug. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
