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Our server's swap space is running full and the only suspicious log entry in /var/log/messages is the following.

Jul  3 04:30:27 delirium kernel: [670204.532868] php-cgi       D ffffffff810f6c00     0 11393  11386 0x00000000
Jul  3 04:30:27 delirium kernel: [670204.532871]  ffff880121da1ca8 0000000000000082 0000000000015e00 0000000000015e00
Jul  3 04:30:27 delirium kernel: [670204.532873]  ffff8801001283d0 ffff880121da1fd8 0000000000015e00 ffff880100128000
Jul  3 04:30:27 delirium kernel: [670204.532875]  0000000000015e00 ffff880121da1fd8 0000000000015e00 ffff8801001283d0
Jul  3 04:30:27 delirium kernel: [670204.532877] Call Trace:
Jul  3 04:30:27 delirium kernel: [670204.532884]  [<ffffffff810f6c00>] ? sync_page+0x0/0x50
Jul  3 04:30:27 delirium kernel: [670204.532887]  [<ffffffff81569683>] io_schedule+0x73/0xc0
Jul  3 04:30:29 delirium kernel: [670204.532889]  [<ffffffff810f6c3d>] sync_page+0x3d/0x50
Jul  3 04:30:29 delirium kernel: [670204.532891]  [<ffffffff81569b7a>] __wait_on_bit_lock+0x5a/0xc0
Jul  3 04:30:29 delirium kernel: [670204.532893]  [<ffffffff810f6bd7>] __lock_page+0x67/0x70
Jul  3 04:30:29 delirium kernel: [670204.532896]  [<ffffffff81086690>] ? wake_bit_function+0x0/0x40
Jul  3 04:30:29 delirium kernel: [670204.532898]  [<ffffffff810f6a0e>] ? find_get_page+0x1e/0xa0
Jul  3 04:30:29 delirium kernel: [670204.532899]  [<ffffffff810f8628>] filemap_fault+0x288/0x450
Jul  3 04:30:29 delirium kernel: [670204.532903]  [<ffffffff81115104>] __do_fault+0x54/0x500
Jul  3 04:30:29 delirium kernel: [670204.532905]  [<ffffffff811186ba>] handle_mm_fault+0x1aa/0x3c0
Jul  3 04:30:29 delirium kernel: [670204.532907]  [<ffffffff8111e155>] ? mprotect_fixup+0x165/0x2b0
Jul  3 04:30:29 delirium kernel: [670204.532909]  [<ffffffff8156e195>] do_page_fault+0x125/0x3b0
Jul  3 04:30:29 delirium kernel: [670204.532912]  [<ffffffff8156bae5>] page_fault+0x25/0x30
Jul  3 04:30:29 delirium kernel: [670204.534340] php-cgi       D ffffffff810f6c00     0 11484  11462 0x00000000
Jul  3 04:30:29 delirium kernel: [670204.534343]  ffff8801176f7ca8 0000000000000082 0000000000015e00 0000000000015e00
Jul  3 04:30:29 delirium kernel: [670204.534345]  ffff88000990dfd0 ffff8801176f7fd8 0000000000015e00 ffff88000990dc00
Jul  3 04:30:30 delirium kernel: [670204.534347]  0000000000015e00 ffff8801176f7fd8 0000000000015e00 ffff88000990dfd0
Jul  3 04:30:30 delirium kernel: [670204.534349] Call Trace:
Jul  3 04:30:30 delirium kernel: [670204.534351]  [<ffffffff810f6c00>] ? sync_page+0x0/0x50
Jul  3 04:30:30 delirium kernel: [670204.534353]  [<ffffffff81569683>] io_schedule+0x73/0xc0
Jul  3 04:30:30 delirium kernel: [670204.534355]  [<ffffffff810f6c3d>] sync_page+0x3d/0x50
Jul  3 04:30:30 delirium kernel: [670204.534356]  [<ffffffff81569b7a>] __wait_on_bit_lock+0x5a/0xc0
Jul  3 04:30:30 delirium kernel: [670204.534358]  [<ffffffff810f6bd7>] __lock_page+0x67/0x70

I however have no idea what it means.

Our PHP version is as follows.

PHP 5.3.2-1ubuntu4.19 with Suhosin-Patch (cli) (built: Mar 11 2013 15:23:48)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with the ionCube PHP Loader v4.0.1, Copyright (c) 2002-2010, by ionCube Ltd.

What are the steps to debug it?

share|improve this question
    
nice name for server :) delirium .... @Tony Stark :) –  B14D3 Jul 8 '13 at 11:53
    
It's hard to tell what's wrong ... this logs may indicate that php-cgi craches because of lack of memory... –  B14D3 Jul 8 '13 at 11:55

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