#44 openl2tpd: page allocation failure

[jacquesqiao]

I use openl2tp on openwrt as a l2tp client. When i connect to a l2tp server I set up with xl2tp,it works very well. But when i connect to a cisco 7206 l2tp server. After CHAP authentication succeeded, the kernel warn :pppd: page allocation failure: order:7, mode:0x4020
the log was:

pppd[3291]: rcvd [CHAP Success id=0x1 ""]
daemon.info pppd[3291]: CHAP authentication succeeded
daemon.notice pppd[3291]: CHAP authentication succeeded
daemon.debug pppd[3291]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0="">]</addr>
daemon.debug pppd[3291]: rcvd [IPCP ConfReq id=0x1 <addr 61.154.237.10="">]</addr>
daemon.debug pppd[3291]: sent [IPCP ConfAck id=0x1 <addr 61.154.237.10="">]</addr>
daemon.debug pppd[3291]: rcvd [IPCP ConfNak id=0x1 <addr 10.0.0.2="">]</addr>
daemon.debug pppd[3291]: sent [IPCP ConfReq id=0x2 <addr 10.0.0.2="">]</addr>
daemon.debug pppd[3291]: rcvd [IPCP ConfAck id=0x2 <addr 10.0.0.2="">]</addr>
daemon.err pppd[3291]: not replacing existing default route via 192.168.5.253
daemon.notice pppd[3291]: local IP address 10.0.0.2
daemon.notice pppd[3291]: remote IP address 61.154.237.10
daemon.debug pppd[3291]: openl2tp send: sent PPP_UPDOWN_IND, 52 bytes
daemon.debug pppd[3291]: Script /etc/ppp/ip-up started (pid 3453)
kern.warn kernel: [55094.050000] pppd: page allocation failure: order:7, mode:0x4020
Hiwifi kern.warn kernel: [55094.060000] Call Trace:
daemon.debug pppd[3291]: Script /etc/ppp/ip-up finished (pid 3453), status = 0x1
Hiwifi kern.warn kernel: [55094.060000] [<80269d14>] dump_stack+0x8/0x34
kern.warn kernel: [55094.060000] [<800af668>] warn_alloc_failed+0xe8/0x10c
kern.warn kernel: [55094.070000] [<800b1968>] __alloc_pages_nodemask+0x5a0/0x600
kern.warn kernel: [55094.080000] [<800b19e0>] __get_free_pages+0x18/0x4c
kern.warn kernel: [55094.080000] [<801dae24>] pskb_expand_head+0xf8/0x2d4
kern.warn kernel: [55094.090000] [<83395298>] 0x83395298
kern.warn kernel: [55094.090000]

there are some other people also find this problem.
https://dev.openwrt.org/ticket/12011#comment:11>
we guess that there are some problems in the kernel module because when user xl2tp this also happen, can you help me about this or give me some guide to find the reason?
much thanks