addr1line says vmscan.c:0 I must have not compiled with some debugging info? On Fri, 8 Jul 2011, Minchan Kim wrote: >Date: Fri, 8 Jul 2011 14:14:09 +0900 >From: Minchan Kim <minchan.kim@xxxxxxxxx> >To: Chris Pearson <kermit4@xxxxxxxxx> >Cc: linux-mm@xxxxxxxxx, Andrea Arcangeli <aarcange@xxxxxxxxxx> >Subject: Re: NULL poniter dereference in isolate_lru_pages 2.6.39.1 > >On Fri, Jul 8, 2011 at 12:53 AM, Chris Pearson <kermit4@xxxxxxxxx> wrote: >> see attached screenshots >> >> NULL pointer dereference at 8 >> >> isolate_lru_pages >> shrink_inactive_list >> __lookup_tag >> shrink_zone >> shrink_slab >> kswapd >> zone_reclaim >> >> These are from 3 different servers in the past week since we upgraded >> a few hundred of them to 2.6.39.1. They're under a steady few MB/s >> of net and disk I/O load. >> >> We have the following /proc adjustments: >> >> kernel.shmmax = 135217728 >> fs.file-max = 65535 >> vm.swappiness = 10 >> vm.min_free_kbytes = 65535 >> > >I didn't have see such BUG until now. >Could you tell me which point is isolate_lru_pages + 0x225? >You can get it with addr2line -e vmlinux -i ffffffff8108ed15 or gdb. > >The culprit I think is page_count. >A month ago, Andrea pointed out and sent the patch but it seems it >isn't stable tree. > >Could you test below patch? >https://patchwork.kernel.org/patch/857442/ > > > >-- >Kind regards, >Minchan Kim > -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>