On Mon, May 30, 2016 at 03:13:40PM +0200, Geert Uytterhoeven wrote: > > The benefit is negligible and the results are within the noise but each > > cycle counts. > > > > Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > > Cc: Vlastimil Babka <vbabka@xxxxxxx> > > Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx> > > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > > Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > > About one week ago, I started seeing an obscure intermittent crash during > system shutdown on m68k/ARAnyM using atari_defconfig. > The crash isn't 100% reproducible, but it happens during ca. 1 out of 5 > shutdowns. > > I finally managed to bisect it to the above commit. > I did verify that the parent commit didn't crash after 60 tries. > Unfortunately I couldn't revert the offending commit on top of v4.7-rc1, due to > conflicting changes. > > Do you have any idea what's going wrong? There isn't anything obvious from the crash log you showed but can you try the following just in case? diff --git a/mm/page_alloc.c b/mm/page_alloc.c index dba8cfd0b2d6..f2c1e47adc11 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3232,6 +3232,9 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, * allocations are system rather than user orientated */ ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); + ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, + ac->high_zoneidx, ac->nodemask); + ac->classzone_idx = zonelist_zone_idx(ac->preferred_zoneref); page = get_page_from_freelist(gfp_mask, order, ALLOC_NO_WATERMARKS, ac); if (page) -- 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>