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    SubjectRe: 2.6.34.1 page allocation failure
    On Sun, 22 Aug 2010, Stan Hoeppner wrote:

    > I'm not subscribed to lkml so please CC me in replies. First post.

    I'm seeing similar problems on older kernels (.24 up to .32).

    <http://www.spinics.net/lists/linux-mm/msg07808.html>

    I didn't get any response at all, neither on linux-mm or lkml... Our
    problems seem very similar, but I'm running 64bit and I have 8 gigs of
    ram.

    Personally I can avoid this by tuning down my TCP settings so TCP uses
    less memory, but I don't think that workaround is very good, this
    shouldn't happen. My machine also freezes up (pressing caps lock doesn't
    work) sometimes, sometimes it just logs the error.

    > Mobo: Abit BP6, dual Celeron 366@500, i440BX chipset, 384MB PC100
    > Disk: SiI 3512 PCI (sata_sil, libata), 1 x WD5000AAKS 500 GB SATAII
    > Kernel: vanilla 2.6.34.1, 32 bit x86, SMP, Celeron pre Coppermine
    > OS: Debian 5.0.5 (Stable)
    > Build: kernel configured via make menuconfig
    > no modules, no initrd
    > built via "make KDEB_PKGVERSION="
    > installed via dpkg, bootloader is LILO
    > Role: headless SOHO server, run level 2, _very_ light load
    > Postfix, pdns-recursor, Dovecot, Lighttpd, Roundcube, Samba
    > bulk of system memory (>300MB) is consumed by buffers/cache
    > Issue: AFAIK, these errors never occurred with any revisions of
    > 2.6.26, .31, or .32. After installing 2.6.34.1 I've noticed
    > the following errors in dmesg. I see 6 of these, including
    > two errors each for kswapd0, lighttpd, and smtpd, all not
    > tainted. AFAICT everything is still running fine. Are these
    > critical errors? If so, how do I fix?
    >
    > kswapd0: page allocation failure. order:1, mode:0x20
    > Pid: 139, comm: kswapd0 Not tainted 2.6.34.1 #1
    > Call Trace:
    > [<c104b6b3>] ? __alloc_pages_nodemask+0x448/0x48a
    > [<c1062ffb>] ? cache_alloc_refill+0x22f/0x422
    > [<c11a9a73>] ? tcp_v4_send_check+0x6e/0xa4
    > [<c10632c3>] ? kmem_cache_alloc+0x41/0x6a
    > [<c11773a5>] ? sk_prot_alloc+0x19/0x55
    > [<c117744b>] ? sk_clone+0x16/0x1cc
    > [<c119a71d>] ? inet_csk_clone+0xf/0x80
    > [<c11ac0e3>] ? tcp_create_openreq_child+0x1a/0x3c8
    > [<c11aaf0a>] ? tcp_v4_syn_recv_sock+0x4b/0x151
    > [<c11abf9d>] ? tcp_check_req+0x209/0x335
    > [<c11aa892>] ? tcp_v4_do_rcv+0x8d/0x14d
    > [<c11aacd5>] ? tcp_v4_rcv+0x383/0x56d
    > [<c1193ba4>] ? ip_local_deliver+0x76/0xc0
    > [<c1193b10>] ? ip_rcv+0x3dc/0x3fa
    > [<c103655e>] ? ktime_get_real+0xf/0x2b
    > [<c117f8d3>] ? netif_receive_skb+0x219/0x234
    > [<c115ff46>] ? e100_poll+0x1d0/0x47e
    > [<c117fa98>] ? net_rx_action+0x58/0xf8
    > [<c102539c>] ? __do_softirq+0x78/0xe5
    > [<c102542c>] ? do_softirq+0x23/0x27
    > [<c1003955>] ? do_IRQ+0x7d/0x8e
    > [<c1002aa9>] ? common_interrupt+0x29/0x30
    > [<c1062870>] ? kmem_cache_free+0xbd/0xc5
    > [<c10fa7d1>] ? __xfs_inode_set_reclaim_tag+0x29/0x2f
    > [<c1075215>] ? destroy_inode+0x1c/0x2b
    > [<c10752ce>] ? dispose_list+0xaa/0xd0
    > [<c107548c>] ? shrink_icache_memory+0x198/0x1c5
    > [<c104f76b>] ? shrink_slab+0xda/0x12f
    > [<c104fc28>] ? kswapd+0x468/0x63b
    > [<c104dca3>] ? isolate_pages_global+0x0/0x1bc
    > [<c10304d6>] ? autoremove_wake_function+0x0/0x2d
    > [<c1018faf>] ? complete+0x28/0x36
    > [<c104f7c0>] ? kswapd+0x0/0x63b
    > [<c10301cd>] ? kthread+0x61/0x66
    > [<c103016c>] ? kthread+0x0/0x66
    > [<c1002ab6>] ? kernel_thread_helper+0x6/0x10
    > Mem-Info:
    > DMA per-cpu:
    > CPU 0: hi: 0, btch: 1 usd: 0
    > CPU 1: hi: 0, btch: 1 usd: 0
    > Normal per-cpu:
    > CPU 0: hi: 186, btch: 31 usd: 180
    > CPU 1: hi: 186, btch: 31 usd: 29
    > active_anon:646 inactive_anon:4337 isolated_anon:0
    > active_file:27189 inactive_file:35957 isolated_file:0
    > unevictable:0 dirty:56 writeback:0 unstable:0
    > free:1142 slab_reclaimable:25495 slab_unreclaimable:1020
    > mapped:3116 shmem:143 pagetables:123 bounce:0
    > DMA free:1568kB min:100kB low:124kB high:148kB active_anon:0kB
    > inactive_anon:4kB active_file:5704kB inactive_file:7732kB
    > unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15868kB
    > mlocked:0kB dirty:0kB writeback:0kB mapped:28kB shmem:0kB
    > slab_reclaimable:912kB slab_unreclaimable:52kB kernel_stack:0kB
    > pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0
    > all_unreclaimable? no
    > lowmem_reserve[]: 0 365 365
    > Normal free:3000kB min:2392kB low:2988kB high:3588kB active_anon:2584kB
    > inactive_anon:17344kB active_file:103052kB inactive_file:136096kB
    > unevictable:0kB isolated(anon):0kB isolated(file):0kB present:373888kB
    > mlocked:0kB dirty:224kB writeback:0kB mapped:12436kB shmem:572kB
    > slab_reclaimable:101068kB slab_unreclaimable:4028kB kernel_stack:520kB
    > pagetables:492kB unstable:0kB bounce:0kB writeback_tmp:0kB
    > pages_scanned:0 all_unreclaimable? no
    > lowmem_reserve[]: 0 0 0
    > DMA: 391*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
    > 0*2048kB 0*4096kB = 1564kB
    > Normal: 750*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB
    > 0*1024kB 0*2048kB 0*4096kB = 3000kB
    > 63342 total pagecache pages
    > 23 pages in swap cache
    > Swap cache stats: add 159, delete 136, find 401/412
    > Free swap = 995636kB
    > Total swap = 995992kB
    > 98303 pages RAM
    > 1638 pages reserved
    > 22416 pages shared
    > 76947 pages non-shared
    >
    > Thanks.
    >
    > --
    > Stan
    > --
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    --
    Mikael Abrahamsson email: swmike@swm.pp.se


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