(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Tue, 03 Nov 2015 16:21:06 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=107111 > > Bug ID: 107111 > Summary: page allocation failure but there seem to be free > pages > Product: Memory Management > Version: 2.5 > Kernel Version: 4.2.3 > Hardware: IA-64 Note: IA64. It isn't tested much and perhaps this triggered an oddity. > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Page Allocator > Assignee: akpm@xxxxxxxxxxxxxxxxxxxx > Reporter: john@xxxxxxxxx > Regression: No > > I'm getting various page allocation errors, mostly: > > apache2: page allocation failure: order:1, mode:0x204020 > > but also > > kswapd0: page allocation failure: order:1, mode:0x204020 > swapper/0: page allocation failure: order:1, mode:0x204020 > > My (virtual) machine doesn't have much memory (2G) but it seems to have some > free: > > MemFree: 226832 kB > > Here is the full output of the last error: > > [1188431.177410] apache2: page allocation failure: order:1, mode:0x204020 An order-1 page, __GFP_COMP|__GFP_HIGH. ie: GFP_ATOMIC. > [1188431.177413] CPU: 0 PID: 6673 Comm: apache2 Not tainted 4.2.3-jh1 #2 > [1188431.177414] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 > [1188431.177416] 0000000000000000 0000000000000000 ffffffff8155b3d8 > 0000000000204020 > [1188431.177418] ffffffff8115a911 0000000100000000 00ff880000000000 > ffff88007fffdb00 > [1188431.177421] 0000000000000000 ffff88007fffdb08 0000000000000000 > ffff880036d6a540 > [1188431.177424] Call Trace: > [1188431.177425] <IRQ> [<ffffffff8155b3d8>] ? dump_stack+0x40/0x50 > [1188431.177430] [<ffffffff8115a911>] ? warn_alloc_failed+0xf1/0x150 > [1188431.177433] [<ffffffff8115da78>] ? __alloc_pages_nodemask+0x2b8/0x990 > [1188431.177436] [<ffffffff811a6acf>] ? kmem_getpages+0x5f/0x110 > [1188431.177439] [<ffffffff811a8778>] ? fallback_alloc+0x1b8/0x210 > [1188431.177441] [<ffffffff811a9a97>] ? kmem_cache_alloc+0x187/0x1c0 > [1188431.177444] [<ffffffff8144c9b8>] ? sk_prot_alloc+0x48/0x190 > [1188431.177446] [<ffffffff8144f1df>] ? sk_clone_lock+0x1f/0x330 > [1188431.177449] [<ffffffff814a8ea5>] ? inet_csk_clone_lock+0x15/0x130 > [1188431.177451] [<ffffffff814c3172>] ? tcp_create_openreq_child+0x22/0x470 > [1188431.177453] [<ffffffff814c12fc>] ? tcp_v4_syn_recv_sock+0x4c/0x370 > [1188431.177456] [<ffffffff814a9bb9>] ? > inet_csk_reqsk_queue_hash_add+0x89/0xa0 > [1188431.177459] [<ffffffff815303ca>] ? tcp_v6_syn_recv_sock+0x45a/0x6c0 > [1188431.177462] [<ffffffff810c5165>] ? handle_edge_irq+0x95/0x150 > [1188431.177464] [<ffffffff814c396e>] ? tcp_check_req+0x37e/0x4a0 > [1188431.177466] [<ffffffff814c1c1c>] ? tcp_v4_do_rcv+0x1ec/0x3b0 > [1188431.177469] [<ffffffff814c2f74>] ? tcp_v4_rcv+0x954/0xa20 > [1188431.177471] [<ffffffff8105a89e>] ? kvm_clock_read+0x1e/0x30 > [1188431.177474] [<ffffffff8149e5a7>] ? ip_local_deliver_finish+0x97/0x1e0 > [1188431.177477] [<ffffffff8149e856>] ? ip_local_deliver+0x46/0xb0 > [1188431.177479] [<ffffffff8149e45b>] ? ip_rcv_finish+0x29b/0x350 > [1188431.177482] [<ffffffff8149eb48>] ? ip_rcv+0x288/0x3f0 > [1188431.177485] [<ffffffff814640fc>] ? __netif_receive_skb_core+0x65c/0x910 > [1188431.177487] [<ffffffff8105a89e>] ? kvm_clock_read+0x1e/0x30 > [1188431.177490] [<ffffffff8146456f>] ? netif_receive_skb_internal+0x1f/0x80 > [1188431.177493] [<ffffffffa0010610>] ? virtnet_receive+0x280/0x870 > [virtio_net] > [1188431.177496] [<ffffffffa0010c26>] ? virtnet_poll+0x26/0x90 [virtio_net] > [1188431.177499] [<ffffffff81464c7c>] ? net_rx_action+0x15c/0x310 > [1188431.177502] [<ffffffff81074f9f>] ? __do_softirq+0xcf/0x250 > [1188431.177505] [<ffffffff81075333>] ? irq_exit+0x93/0xa0 > [1188431.177507] [<ffffffff81563cd4>] ? do_IRQ+0x64/0x100 > [1188431.177510] [<ffffffff81561c6b>] ? common_interrupt+0x6b/0x6b > [1188431.177511] <EOI> Mem-Info: > [1188431.177516] active_anon:32089 inactive_anon:34044 isolated_anon:0 > [1188431.177516] active_file:187241 inactive_file:189090 isolated_file:0 > [1188431.177516] unevictable:16 dirty:949 writeback:0 unstable:0 > [1188431.177516] slab_reclaimable:52124 slab_unreclaimable:5167 > [1188431.177516] mapped:13709 shmem:4094 pagetables:3847 bounce:0 > [1188431.177516] free:3964 free_pcp:170 free_cma:0 > [1188431.177521] Node 0 DMA free:7968kB min:40kB low:48kB high:60kB The 16MB DMA zone has 8MB free and it's miles above watermarks. > active_anon:112kB inactive_anon:388kB active_file:948kB inactive_file:1744kB > unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15944kB > managed:15860kB mlocked:0kB dirty:8kB writeback:0kB mapped:52kB shmem:0kB > slab_reclaimable:1388kB slab_unreclaimable:856kB kernel_stack:960kB > pagetables:44kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no > [1188431.177527] lowmem_reserve[]: 0 1988 1988 1988 > [1188431.177530] Node 0 DMA32 free:7888kB min:5588kB low:6984kB high:8380kB The DMA32 zone is somewhat depleted. > active_anon:128244kB inactive_anon:135788kB active_file:748016kB > inactive_file:754616kB unevictable:64kB isolated(anon):0kB isolated(file):0kB > present:2080768kB managed:2038300kB mlocked:64kB dirty:3788kB writeback:0kB > mapped:54784kB shmem:16376kB slab_reclaimable:207108kB > slab_unreclaimable:19812kB kernel_stack:3712kB pagetables:15344kB unstable:0kB > bounce:0kB free_pcp:680kB local_pcp:680kB free_cma:0kB writeback_tmp:0kB > pages_scanned:0 all_unreclaimable? no > [1188431.177552] lowmem_reserve[]: 0 0 0 0 > [1188431.177555] Node 0 DMA: 44*4kB (UE) 94*8kB (UEM) 76*16kB (UE) 42*32kB > (UEM) 22*64kB (UEM) 6*128kB (UE) 3*256kB (UE) 1*512kB (E) 1*1024kB (U) 0*2048kB > 0*4096kB = 7968kB The DMA zone has lots and lots of higher-order pages available which could satisfy this allocation. > [1188431.177567] Node 0 DMA32: 1972*4kB (U) 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB > 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 7888kB The DMA32 zone has no higher-order pages available. > [1188431.177576] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 > hugepages_size=2048kB > [1188431.177578] 338595 total pagecache pages > [1188431.177579] 2504 pages in swap cache > [1188431.177581] Swap cache stats: add 66871, delete 64367, find > 21973081/21986496 > [1188431.177582] Free swap = 4127584kB > [1188431.177584] Total swap = 4194300kB > [1188431.177585] 524178 pages RAM > [1188431.177586] 0 pages HighMem/MovableOnly > [1188431.177587] 10638 pages reserved > [1188431.177589] 0 pages hwpoisoned The kernel could and should have satisfied this order-1 GFP_ATOMIC IRQ-context allocation from the DMA zone. But it did not do so. Bug. -- 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>