On Thu, Oct 18, 2012 at 03:44:30PM -0500, Tim Nelson wrote: > Oct 18 03:10:52 backup kernel: Pid: 0, comm: swapper Not tainted 2.6.32-279.9.1.el6.x86_64 #1 ... > Oct 18 03:10:52 backup kernel: [<ffffffff814927ed>] ? tcp_v4_syn_recv_sock+0x4d/0x310 > Oct 18 03:10:52 backup kernel: [<ffffffff81494d26>] ? tcp_check_req+0x226/0x460 > Oct 18 03:10:52 backup kernel: [<ffffffff8148a6d6>] ? tcp_rcv_state_process+0x126/0xa10 > Any thoughts on the cause? The system has 16GB of RAM, and whenever It's not a normal "out of memory" error. > checked, there is no swap usage. Is this a memory error (bad RAM)? I see this sometimes on my linode using their custom kernel when doing lots of network communication (rsync'ing files). It looks like an issue with the TCP/IP4 stack. When I switched to IP6 then the messages went away. -- rgds Stephen