[cobalt-security] get_hash_table+23/36

["Andres C." <anakinpc@xxxxxxxxxxx>]

I've a problem with this.
Kernel goes dwon and logs show something like this.

Dec 23 08:42:47 ns1 kernel: Stack: 000000c4 d5cec540 00059682 c0126013
00000304 00405049 00000400 c0126de8
Dec 23 08:42:47 ns1 kernel:        00000304 00405049 00000400 00000000
d25fdef4 000000c4 d782b100 d782b100
Dec 23 08:42:47 ns1 kernel:        de0d1bc0 c46c2000 00000304 00000002
d5cec660 00000000 d5cec660 d5cec480
Dec 23 08:42:47 ns1 kernel: Call Trace: [get_hash_table+23/36]
[brw_page+332/924] [ext2_bmap+110/132] [generic_readpage+133/148]
[try_to_read_ahead+254/276] [do_generic_file_read+750/1508]
[generic_file_read+99/124]
Dec 23 08:42:47 ns1 kernel:        [file_read_actor+0/80] [sys_read+174/196]
[system_call+52/56]
Dec 23 08:42:47 ns1 kernel: Code: 8b 00 39 6a 04 75 15 8b 4c 24 20 39 4a 08
75 0c 66 39 7a 0c
Dec 23 10:03:52 ns1 kernel: possible SYN flooding on port 80. Sending
cookies.

It could be a DOS attack? Some has suggestions how to prevent?
Greetings.