On Tue, Apr 02, 2013 at 01:41:34PM +0200, Stefan Priebe - Profihost AG wrote: > Am 02.04.2013 12:48, schrieb Mel Gorman: > > On Tue, Apr 02, 2013 at 09:24:51AM +0200, Stefan Priebe - Profihost AG wrote: > >> Hello list, > >> > >> i was trying to play with the new NUMA autobalancing feature of Kernel 3.8. > >> > >> But if i enable: > >> CONFIG_ARCH_USES_NUMA_PROT_NONE=y > >> CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y > >> CONFIG_NUMA_BALANCING=y > >> > >> i see random process crashes mostly in libc using vanilla 3.8.4. > >> > > > > Any more details than that? What sort of crashes? Anything in the kernel > > log? Any particular pattern to the crashes? Any means of reliably > > reproducing it? 3.8 vanilla, 3.8-stable or 3.8 with any other patches > > applied? > > Sorry for missing information. > > > Any more details than that? > Sadly not i just see a crash line in the kernel log - see below. > > > What sort of crashes? > Mostly the processes just die but i've also seen processes consuming > 100% CPU all the time or even just doing nothing anymore. > When you see the 100% CPU usage can you cat /proc/PID/stack a couple of times and post it here? That might give a hint as to where it's going wrong. > > Anything in the kernel log? > Three examples: > pigz[10194]: segfault at 0 ip (null) sp 00007f6197ffed50 error > 14 in pigz[400000+e000] > > rbd[2811]: segfault at b8 ip 00007f73c2d51b9e sp 00007f73bcae3b40 error > 4 in librados.so.2.0.0[7f73c2afe000+3b9000] > > rbd[1805]: segfault at 0 ip 00007f60c28dceb4 sp 00007f60b7ffd1f8 error 4 > in ld-2.11.3.so[7f60c28cc000+1e000] > > > Any particular pattern to the crashes? Any means of reliably > > reproducing it? > No i just need to run some task and after some time they die or hang > forever. I have this on 10 different E5-2640 and also on E56XX. I can > "fix" this by: > 1.) putting all memory to just ONE CPU > 2.) Disable NUMA Balancing > That does point the finger at the automatic balancing. > > 3.8 vanilla, 3.8-stable or 3.8 with any other patches > > applied? > 3.8.4 without any patches. > Did it happen in 3.8? -- Mel Gorman SUSE Labs -- 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>