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Message-ID: <40a4ed590904241113p4949a020y46e0641e77f6f4e3@mail.gmail.com> Date: Fri, 24 Apr 2009 20:13:07 +0200 From: Zeno Davatz <zdavatz@...il.com> To: David Rientjes <rientjes@...gle.com> Cc: linux-kernel@...r.kernel.org, Hannes Wyss <hwyss@...see.com> Subject: Re: Kernel 2.6.29 runs out of memory and hangs. Dear David Thank you for your reply, as following: On Fri, Apr 24, 2009 at 7:17 PM, David Rientjes <rientjes@...gle.com> wrote: > On Fri, 24 Apr 2009, Zeno Davatz wrote: >> Linux thinpower 2.6.29 #5 SMP Sun Apr 5 20:04:08 UTC 2009 x86_64 >> Intel(R) Xeon(R) CPU E5450 @ 3.00GHz GenuineIntel GNU/Linux >> >> This morning our Server ran out of memory and had to be hard rebooted. >> The system hast 32 GB or memory and 4 QuadCore Xeon CPUs. >> /var/log/kernel/current tells us the following: >> >> Apr 24 09:01:06 thinpower [1349923.491914] postgres invoked >> oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0 >> Apr 24 09:01:06 thinpower [1349923.491919] postgres cpuset=/ mems_allowed=0 >> Apr 24 09:01:06 thinpower [1349923.491922] Pid: 2393, comm: postgres >> Not tainted 2.6.29 #5 >> Apr 24 09:01:06 thinpower [1349923.491924] Call Trace: >> Apr 24 09:01:06 thinpower [1349923.491934] [<ffffffff8106eda9>] ? >> cpuset_print_task_mems_allowed+0x99/0x9f >> Apr 24 09:01:06 thinpower [1349923.491939] [<ffffffff81083d28>] >> oom_kill_process+0x96/0x246 >> Apr 24 09:01:06 thinpower [1349923.491942] [<ffffffff8106dcf0>] ? >> cpuset_mems_allowed_intersects+0x1c/0x1e >> Apr 24 09:01:06 thinpower [1349923.491944] [<ffffffff810840a5>] ? >> badness+0x1a3/0x1e6 >> Apr 24 09:01:06 thinpower [1349923.491946] [<ffffffff8108421c>] >> __out_of_memory+0x134/0x14b >> Apr 24 09:01:06 thinpower [1349923.491949] [<ffffffff8108438b>] >> out_of_memory+0x158/0x18a >> Apr 24 09:01:06 thinpower [1349923.491951] [<ffffffff81087906>] >> __alloc_pages_internal+0x372/0x434 >> Apr 24 09:01:06 thinpower [1349923.491954] [<ffffffff810aa490>] >> alloc_pages_current+0xb9/0xc2 >> Apr 24 09:01:06 thinpower [1349923.491957] [<ffffffff81081a59>] >> __page_cache_alloc+0x67/0x6b >> Apr 24 09:01:06 thinpower [1349923.491959] [<ffffffff81089426>] >> __do_page_cache_readahead+0x96/0x192 >> Apr 24 09:01:06 thinpower [1349923.491961] [<ffffffff81089575>] >> do_page_cache_readahead+0x53/0x60 >> Apr 24 09:01:06 thinpower [1349923.491963] [<ffffffff81081ec7>] >> filemap_fault+0x15e/0x313 >> Apr 24 09:01:06 thinpower [1349923.491967] [<ffffffff81094451>] >> __do_fault+0x53/0x393 >> Apr 24 09:01:06 thinpower [1349923.491969] [<ffffffff81030531>] ? >> __wake_up_sync+0x45/0x4e >> Apr 24 09:01:06 thinpower [1349923.491972] [<ffffffff81096702>] >> handle_mm_fault+0x36b/0x854 >> Apr 24 09:01:06 thinpower [1349923.491976] [<ffffffff813a1acb>] ? >> release_sock+0xb0/0xbb >> Apr 24 09:01:06 thinpower [1349923.491979] [<ffffffff81022c8f>] ? >> default_spin_lock_flags+0x9/0xe >> Apr 24 09:01:06 thinpower [1349923.491984] [<ffffffff814ac6fe>] >> do_page_fault+0x662/0xa5c >> Apr 24 09:01:06 thinpower [1349923.491988] [<ffffffff81400b8e>] ? >> inet_sendmsg+0x46/0x53 >> Apr 24 09:01:06 thinpower [1349923.491992] [<ffffffff8139ed97>] ? >> __sock_sendmsg+0x59/0x62 >> Apr 24 09:01:06 thinpower [1349923.491994] [<ffffffff8139f6d8>] ? >> sock_sendmsg+0xc7/0xe0 >> Apr 24 09:01:06 thinpower [1349923.491996] [<ffffffff81086b5e>] ? >> free_pages+0x32/0x36 >> Apr 24 09:01:06 thinpower [1349923.492000] [<ffffffff8104e7ec>] ? >> autoremove_wake_function+0x0/0x38 >> Apr 24 09:01:06 thinpower [1349923.492004] [<ffffffff810c1d76>] ? >> core_sys_select+0x1df/0x213 >> Apr 24 09:01:06 thinpower [1349923.492007] [<ffffffff810b2cc2>] ? >> nameidata_to_filp+0x41/0x52 >> Apr 24 09:01:06 thinpower [1349923.492009] [<ffffffff8139f028>] ? >> sockfd_lookup_light+0x1b/0x54 >> Apr 24 09:01:06 thinpower [1349923.492013] [<ffffffff81011ac8>] ? >> read_tsc+0xe/0x24 >> Apr 24 09:01:06 thinpower [1349923.492017] [<ffffffff81055990>] ? >> getnstimeofday+0x58/0xb4 >> Apr 24 09:01:06 thinpower [1349923.492019] [<ffffffff810516ed>] ? >> ktime_get_ts+0x49/0x4e >> Apr 24 09:01:06 thinpower [1349923.492022] [<ffffffff810c0d35>] ? >> poll_select_copy_remaining+0xc5/0xea >> Apr 24 09:01:06 thinpower [1349923.492023] [<ffffffff810c1ff3>] ? >> sys_select+0xa7/0xbc >> Apr 24 09:01:06 thinpower [1349923.492026] [<ffffffff814aa305>] >> page_fault+0x25/0x30 >> > > Are these the last messages in the dmesg? There should be subsequent > information that describes the current state of memory following the stack > trace. These are the last messages from /var/log/kernel/current - [[ let me know if you need more ]] Apr 24 09:01:00 thinpower [1349916.950049] CPU 0: hi: 186, btch: 31 usd: 110 Apr 24 09:01:00 thinpower [1349916.950051] CPU 1: hi: 186, btch: 31 usd: 111 Apr 24 09:01:00 thinpower [1349916.950052] CPU 2: hi: 186, btch: 31 usd: 162 Apr 24 09:01:00 thinpower [1349916.950053] CPU 3: hi: 186, btch: 31 usd: 157 Apr 24 09:01:00 thinpower [1349916.950055] CPU 4: hi: 186, btch: 31 usd: 109 Apr 24 09:01:00 thinpower [1349916.950056] CPU 5: hi: 186, btch: 31 usd: 102 Apr 24 09:01:00 thinpower [1349916.950057] CPU 6: hi: 186, btch: 31 usd: 179 Apr 24 09:01:00 thinpower [1349916.950058] CPU 7: hi: 186, btch: 31 usd: 123 Apr 24 09:01:00 thinpower [1349916.950061] Active_anon:7600155 active_file:0 inactive_anon:552800 Apr 24 09:01:00 thinpower [1349916.950061] inactive_file:5 unevictable:0 dirty:0 writeback:0 unstable:0 Apr 24 09:01:00 thinpower [1349916.950062] free:38559 slab:12539 mapped:2 pagetables:22733 bounce:0 Apr 24 09:01:00 thinpower [1349916.950064] Node 0 DMA free:15700kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB present:15156kB pages_scanned:0 all_unreclaimable? yes Apr 24 09:01:00 thinpower [1349916.950067] lowmem_reserve[]: 0 3255 32292 32292 Apr 24 09:01:00 thinpower [1349916.950070] Node 0 DMA32 free:117732kB min:2316kB low:2892kB high:3472kB active_anon:2266592kB inactive_anon:453072kB active_file:0kB inactive_file:4kB unevictable:0kB present:3333280kB pages_scanned:1587467 all_unreclaimable? no Apr 24 09:01:00 thinpower [1349916.950074] lowmem_reserve[]: 0 0 29037 29037 Apr 24 09:01:00 thinpower [1349916.950076] Node 0 Normal free:20804kB min:20672kB low:25840kB high:31008kB active_anon:28134028kB inactive_anon:1758128kB active_file:0kB inactive_file:16kB unevictable:0kB present:29734400kB pages_scanned:896 all_unreclaimable? no Apr 24 09:01:00 thinpower [1349916.950080] lowmem_reserve[]: 0 0 0 0 Apr 24 09:01:00 thinpower [1349916.950082] Node 0 DMA: 1*4kB 0*8kB 1*16kB 2*32kB 2*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15700kB Apr 24 09:01:00 thinpower [1349916.950089] Node 0 DMA32: 159*4kB 127*8kB 59*16kB 14*32kB 12*64kB 6*128kB 20*256kB 15*512kB 6*1024kB 2*2048kB 22*4096kB = 117732kB Apr 24 09:01:00 thinpower [1349916.950095] Node 0 Normal: 93*4kB 8*8kB 54*16kB 11*32kB 2*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 4*4096kB = 21108kB Apr 24 09:01:00 thinpower [1349916.950101] 6946 total pagecache pages Apr 24 09:01:00 thinpower [1349916.950102] 0 pages in swap cache Apr 24 09:01:00 thinpower [1349916.950104] Swap cache stats: add 0, delete 0, find 0/0 Apr 24 09:01:00 thinpower [1349916.950105] Free swap = 0kB Apr 24 09:01:00 thinpower [1349916.950106] Total swap = 0kB Apr 24 09:01:00 thinpower [1349917.149549] 8388592 pages RAM Apr 24 09:01:00 thinpower [1349917.149551] 136791 pages reserved Apr 24 09:01:00 thinpower [1349917.149552] 66429 pages shared Apr 24 09:01:00 thinpower [1349917.149553] 8206765 pages non-shared Apr 24 09:01:00 thinpower [1349917.149556] Out of memory: kill process 21692 (ruby) score 58368 or a child Apr 24 09:01:00 thinpower [1349917.149621] Killed process 21692 (ruby) Apr 24 09:01:06 thinpower [1349923.491914] postgres invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0 Apr 24 09:01:06 thinpower [1349923.491919] postgres cpuset=/ mems_allowed=0 Apr 24 09:01:06 thinpower [1349923.491922] Pid: 2393, comm: postgres Not tainted 2.6.29 #5 Apr 24 09:01:06 thinpower [1349923.491924] Call Trace: Apr 24 09:01:06 thinpower [1349923.491934] [<ffffffff8106eda9>] ? cpuset_print_task_mems_allowed+0x99/0x9f Apr 24 09:01:06 thinpower [1349923.491939] [<ffffffff81083d28>] oom_kill_process+0x96/0x246 Apr 24 09:01:06 thinpower [1349923.491942] [<ffffffff8106dcf0>] ? cpuset_mems_allowed_intersects+0x1c/0x1e Apr 24 09:01:06 thinpower [1349923.491944] [<ffffffff810840a5>] ? badness+0x1a3/0x1e6 Apr 24 09:01:06 thinpower [1349923.491946] [<ffffffff8108421c>] __out_of_memory+0x134/0x14b Apr 24 09:01:06 thinpower [1349923.491949] [<ffffffff8108438b>] out_of_memory+0x158/0x18a Apr 24 09:01:06 thinpower [1349923.491951] [<ffffffff81087906>] __alloc_pages_internal+0x372/0x434 Apr 24 09:01:06 thinpower [1349923.491954] [<ffffffff810aa490>] alloc_pages_current+0xb9/0xc2 Apr 24 09:01:06 thinpower [1349923.491957] [<ffffffff81081a59>] __page_cache_alloc+0x67/0x6b Apr 24 09:01:06 thinpower [1349923.491959] [<ffffffff81089426>] __do_page_cache_readahead+0x96/0x192 Apr 24 09:01:06 thinpower [1349923.491961] [<ffffffff81089575>] do_page_cache_readahead+0x53/0x60 Apr 24 09:01:06 thinpower [1349923.491963] [<ffffffff81081ec7>] filemap_fault+0x15e/0x313 Apr 24 09:01:06 thinpower [1349923.491967] [<ffffffff81094451>] __do_fault+0x53/0x393 Apr 24 09:01:06 thinpower [1349923.491969] [<ffffffff81030531>] ? __wake_up_sync+0x45/0x4e Apr 24 09:01:06 thinpower [1349923.491972] [<ffffffff81096702>] handle_mm_fault+0x36b/0x854 Apr 24 09:01:06 thinpower [1349923.491976] [<ffffffff813a1acb>] ? release_sock+0xb0/0xbb Apr 24 09:01:06 thinpower [1349923.491979] [<ffffffff81022c8f>] ? default_spin_lock_flags+0x9/0xe Apr 24 09:01:06 thinpower [1349923.491984] [<ffffffff814ac6fe>] do_page_fault+0x662/0xa5c Apr 24 09:01:06 thinpower [1349923.491988] [<ffffffff81400b8e>] ? inet_sendmsg+0x46/0x53 Apr 24 09:01:06 thinpower [1349923.491992] [<ffffffff8139ed97>] ? __sock_sendmsg+0x59/0x62 Apr 24 09:01:06 thinpower [1349923.491994] [<ffffffff8139f6d8>] ? sock_sendmsg+0xc7/0xe0 Apr 24 09:01:06 thinpower [1349923.491996] [<ffffffff81086b5e>] ? free_pages+0x32/0x36 Apr 24 09:01:06 thinpower [1349923.492000] [<ffffffff8104e7ec>] ? autoremove_wake_function+0x0/0x38 Apr 24 09:01:06 thinpower [1349923.492004] [<ffffffff810c1d76>] ? core_sys_select+0x1df/0x213 Apr 24 09:01:06 thinpower [1349923.492007] [<ffffffff810b2cc2>] ? nameidata_to_filp+0x41/0x52 Apr 24 09:01:06 thinpower [1349923.492009] [<ffffffff8139f028>] ? sockfd_lookup_light+0x1b/0x54 Apr 24 09:01:06 thinpower [1349923.492013] [<ffffffff81011ac8>] ? read_tsc+0xe/0x24 Apr 24 09:01:06 thinpower [1349923.492017] [<ffffffff81055990>] ? getnstimeofday+0x58/0xb4 Apr 24 09:01:06 thinpower [1349923.492019] [<ffffffff810516ed>] ? ktime_get_ts+0x49/0x4e Apr 24 09:01:06 thinpower [1349923.492022] [<ffffffff810c0d35>] ? poll_select_copy_remaining+0xc5/0xea Apr 24 09:01:06 thinpower [1349923.492023] [<ffffffff810c1ff3>] ? sys_select+0xa7/0xbc Apr 24 09:01:06 thinpower [1349923.492026] [<ffffffff814aa305>] page_fault+0x25/0x30 Apr 24 09:01:06 thinpower [1349923.492028] Mem-Info: Apr 24 09:01:06 thinpower [1349923.492029] Node 0 DMA per-cpu: Apr 24 09:01:06 thinpower [1349923.492031] CPU 0: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492032] CPU 1: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492034] CPU 2: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492035] CPU 3: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492036] CPU 4: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492037] CPU 5: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492039] CPU 6: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492040] CPU 7: hi: 0, btch: 1 usd: 0 Apr 24 09:01:06 thinpower [1349923.492041] Node 0 DMA32 per-cpu: Apr 24 09:01:06 thinpower [1349923.492043] CPU 0: hi: 186, btch: 31 usd: 29 Apr 24 09:01:06 thinpower [1349923.492044] CPU 1: hi: 186, btch: 31 usd: 17 Apr 24 09:01:06 thinpower [1349923.492046] CPU 2: hi: 186, btch: 31 usd: 176 Apr 24 09:01:06 thinpower [1349923.492047] CPU 3: hi: 186, btch: 31 usd: 19 Apr 24 09:01:06 thinpower [1349923.492048] CPU 4: hi: 186, btch: 31 usd: 29 Apr 24 09:01:06 thinpower [1349923.492050] CPU 5: hi: 186, btch: 31 usd: 0 Apr 24 09:01:06 thinpower [1349923.492051] CPU 6: hi: 186, btch: 31 usd: 0 Apr 24 09:01:06 thinpower [1349923.492052] CPU 7: hi: 186, btch: 31 usd: 31 Apr 24 09:01:06 thinpower [1349923.492053] Node 0 Normal per-cpu: Apr 24 09:01:06 thinpower [1349923.492055] CPU 0: hi: 186, btch: 31 usd: 50 Apr 24 09:01:06 thinpower [1349923.492056] CPU 1: hi: 186, btch: 31 usd: 20 Apr 24 09:01:06 thinpower [1349923.492057] CPU 2: hi: 186, btch: 31 usd: 42 Apr 24 09:01:06 thinpower [1349923.492059] CPU 3: hi: 186, btch: 31 usd: 124 Apr 24 09:01:06 thinpower [1349923.492060] CPU 4: hi: 186, btch: 31 usd: 104 Apr 24 09:01:06 thinpower [1349923.492061] CPU 5: hi: 186, btch: 31 usd: 95 Apr 24 09:01:06 thinpower [1349923.492062] CPU 6: hi: 186, btch: 31 usd: 178 Apr 24 09:01:06 thinpower [1349923.492064] CPU 7: hi: 186, btch: 31 usd: 60 Apr 24 09:01:06 thinpower [1349923.492066] Active_anon:7595417 active_file:641 inactive_anon:551929 Apr 24 09:01:06 thinpower [1349923.492067] inactive_file:5122 unevictable:0 dirty:0 writeback:0 unstable:0 Apr 24 09:01:06 thinpower [1349923.492068] free:39401 slab:12443 mapped:1801 pagetables:22566 bounce:0 Apr 24 09:01:06 thinpower [1349923.492069] Node 0 DMA free:15700kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB present:15156kB pages_scanned:0 all_unreclaimable? yes Apr 24 09:01:06 thinpower [1349923.492073] lowmem_reserve[]: 0 3255 32292 32292 Apr 24 09:01:06 thinpower [1349923.492076] Node 0 DMA32 free:118848kB min:2316kB low:2892kB high:3472kB active_anon:2265276kB inactive_anon:452944kB active_file:4kB inactive_file:0kB unevictable:0kB present:3333280kB pages_scanned:2692832 all_unreclaimable? no Apr 24 09:01:06 thinpower [1349923.492080] lowmem_reserve[]: 0 0 29037 29037 Apr 24 09:01:06 thinpower [1349923.492082] Node 0 Normal free:23056kB min:20672kB low:25840kB high:31008kB active_anon:28116392kB inactive_anon:1754772kB active_file:2560kB inactive_file:20488kB unevictable:0kB present:29734400kB pages_scanned:77696 all_unreclaimable? no Apr 24 09:01:06 thinpower [1349923.492086] lowmem_reserve[]: 0 0 0 0 Apr 24 09:01:06 thinpower [1349923.492088] Node 0 DMA: 1*4kB 0*8kB 1*16kB 2*32kB 2*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15700kB Apr 24 09:01:06 thinpower [1349923.492095] Node 0 DMA32: 172*4kB 134*8kB 66*16kB 18*32kB 18*64kB 7*128kB 21*256kB 15*512kB 6*1024kB 2*2048kB 22*4096kB = 118848kB Apr 24 09:01:06 thinpower [1349923.492101] Node 0 Normal: 251*4kB 24*8kB 144*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 4*4096kB = 22924kB Apr 24 09:01:06 thinpower [1349923.492107] 12705 total pagecache pages Apr 24 09:01:06 thinpower [1349923.492108] 0 pages in swap cache Apr 24 09:01:06 thinpower [1349923.492109] Swap cache stats: add 0, delete 0, find 0/0 Apr 24 09:01:06 thinpower [1349923.492110] Free swap = 0kB Apr 24 09:01:06 thinpower [1349923.492111] Total swap = 0kB Apr 24 09:01:06 thinpower [1349923.693323] 8388592 pages RAM Apr 24 09:01:06 thinpower [1349923.693326] 136791 pages reserved Apr 24 09:01:06 thinpower [1349923.693327] 69633 pages shared Apr 24 09:01:06 thinpower [1349923.693328] 8205493 pages non-shared Apr 24 09:01:06 thinpower [1349923.693331] Out of memory: kill process 21490 (apache2) score 53801 or a child Apr 24 09:01:06 thinpower [1349923.693410] Killed process 21490 (apache2) > If this is reproducible, I'd recommend enabling > /proc/sys/vm/oom_dump_tasks so that the oom killer will dump the tasklist > and show us what may be causing the livelock. Ok, how do I enable that? I will google for it. If we can reproduce it, I will let you know. >> Before that we had this: >> >> Apr 24 08:59:24 thinpower [1349806.982419] 6954 total pagecache pages >> Apr 24 08:59:24 thinpower [1349806.982420] 0 pages in swap cache >> Apr 24 08:59:24 thinpower [1349806.982422] Swap cache stats: add 0, >> delete 0, find 0/0 >> Apr 24 08:59:24 thinpower [1349806.982423] Free swap = 0kB >> Apr 24 08:59:24 thinpower [1349806.982423] Total swap = 0kB >> Apr 24 08:59:24 thinpower [1349807.182725] 8388592 pages RAM >> Apr 24 08:59:24 thinpower [1349807.182728] 136791 pages reserved >> Apr 24 08:59:24 thinpower [1349807.182729] 35053 pages shared >> Apr 24 08:59:24 thinpower [1349807.182729] 8207346 pages non-shared >> Apr 24 08:59:24 thinpower [1349807.182732] Out of memory: kill process >> 21592 (ruby) score 109489 or a child >> Apr 24 08:59:24 thinpower [1349807.182795] Killed process 21592 (ruby) >> Apr 24 09:00:59 thinpower [1349916.949909] apache2 invoked oom-killer: >> gfp_mask=0x1201d2, order=0, oomkilladj=0 > > apache2 in this case (and postgres later) are valid oom killer targets > because their /proc/pid/oom_adj score is 0. The only reason they wouldn't > be getting killed subsequently is because the already killed tasks, ruby, > is PF_EXITING and has failed to exit. It has access to memory reserves > and if it hangs before dying, the machine will livelock. Thanks for the info. We will try to chew on this. Best Zeno -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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