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Killed process 4181 (apache2) total-vm:59972kB, anon-rss:22520kB, file-rss:0kB
Out of memory: Kill process 4180 (apache2) score 17 or sacrifice child
Killed process 4180 (apache2) total-vm:59972kB, anon-rss:21672kB, file-rss:308kB
Out of memory: Kill process 4170 (apache2) score 17 or sacrifice child
Killed process 4170 (apache2) total-vm:60532kB, anon-rss:13260kB, file-rss:52kB
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kernel BUG at mm/swapfile.c:2529!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/vbd-51712/block/xvda/removable
Modules linked in:

Pid: 4142, comm: apache2 Not tainted 2.6.38.3-linode32 #1  
EIP: 0061:[<c01a3796>] EFLAGS: 00210246 CPU: 0
EIP is at swap_count_continued+0x176/0x180
EAX: f57ba2b0 EBX: ed27ee00 ECX: f57ba000 EDX: 00000000
ESI: ed3d77e0 EDI: 00000080 EBP: 000002b0 ESP: d2e89e80
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069
Process apache2 (pid: 4142, ti=d2e88000 task=ebdff440 task.ti=d2e88000)
Stack:
 ec50be40 0000d2b0 00000040 00000000 c01a3891 0000d2b0 dde2ddc8 ed1b9be0
 00000000 c01a3af8 00000000 c019569c 00000000 80000004 00000000 c0106314
 00000030 eccd4e8c 0000d2b0 e7c9ea78 00000000 ffffffe8 b73d4ce0 00000000
Call Trace:
 [<c01a3891>] ? swap_entry_free+0xf1/0x120
 [<c01a3af8>] ? swap_free+0x18/0x30
 [<c019569c>] ? handle_pte_fault+0x49c/0xac0
 [<c0106314>] ? check_events+0x8/0xc
 [<c0196f61>] ? handle_mm_fault+0x101/0x1a0
 [<c011e81b>] ? do_page_fault+0xfb/0x3e0
 [<c010630b>] ? xen_restore_fl_direct_end+0x0/0x1
 [<c01a9746>] ? kmem_cache_free+0x46/0x120
 [<c019a7c7>] ? remove_vma+0x37/0x50
 [<c019b832>] ? do_munmap+0x1f2/0x2d0
 [<c011e720>] ? do_page_fault+0x0/0x3e0
 [<c063fea6>] ? error_code+0x5a/0x60
 [<c0630000>] ? sctp_get_port_local+0x270/0x340
 [<c011e720>] ? do_page_fault+0x0/0x3e0
Code: ff 89 d8 e8 cd f6 f7 ff 01 e8 8d 76 00 c6 00 00 ba 01 00 00 00 eb b2 89 f8 3c 80 0f 94 c0 e9 b9 fe ff ff 0f 0b eb fe 0f 0b eb fe <0f> 0b eb fe 0f 0b eb fe 66 90 83 ec 10 89 1c 24 89 c3 89 74 24 
EIP: [<c01a3796>] swap_count_continued+0x176/0x180 SS:ESP 0069:d2e89e80
---[ end trace a90047e945361245 ]---
note: apache2[4142] exited with preempt_count 1