OpenL2TP

[76976.348347] BUG: unable to handle kernel NULL pointer dereference at
0000000c
[76976.348476] IP: [<f816e4fc>] pppol2tp_xmit+0x2a9/0x3f9 [pppol2tp]
[76976.348566] *pde = 00000000
[76976.348650] Oops: 0000 [#1] SMP
[76976.348761] last sysfs file:
/sys/devices/pci0000:00/0000:00:1e.0/0000:04:01.0/class
[76976.348835] Modules linked in: netconsole configfs pppol2tp pppox
ppp_async crc_ccitt sg rfcomm l2cap ppp_generic slhc ipt_REDIRECT xt_tcpudp
xt_limit xt_state ipt_REJECT xt_multiport iptable_nat iptable_mangle
iptable_filter nf_nat_sip nf_conntrack_sip nf_nat_ftp nf_nat
nf_conntrack_ftp nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables
x_tables ppdev lp nfsd exportfs nfs lockd nfs_acl auth_rpcgss sunrpc ipv6
ext3 jbd mbcache coretemp it87 hwmon_vid loop btusb i2c_i801
snd_hda_codec_realtek via_rhine ata_piix bluetooth r8169 evdev
snd_hda_intel snd_hda_codec mii i2c_core pcspkr iTCO_wdt snd_hwdep snd_pcm
snd_timer snd soundcore parport_pc snd_page_alloc parport ehci_hcd button
uhci_hcd intel_agp usbcore agpgart reiserfs ide_cd_mod cdrom thermal
processor fan thermal_sys shpchp pci_hotplug ide_gd_mod jmicron
ide_pci_generic ide_core ata_generic libata scsi_mod [last unloaded:
netconsole]
[76976.352152]
[76976.352199] Pid: 3526, comm: xbt_tracker Not tainted (2.6.29-bpo.2-686
#1) EP35-DS3L
[76976.352208] EIP: 0060:[<f816e4fc>] EFLAGS: 00010297 CPU: 0
[76976.352208] EIP is at pppol2tp_xmit+0x2a9/0x3f9 [pppol2tp]
[76976.352208] EAX: 00000000 EBX: c38d75b8 ECX: 0000003a EDX: f61dd940
[76976.352208] ESI: c38240f6 EDI: c38d75e4 EBP: f5d21bc0 ESP: f593fccc
[76976.352208] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[76976.352208] Process xbt_tracker (pid: 3526, ti=f593e000 task=f6aaabd0
task.ti=f593e000)
[76976.352208] Stack:
[76976.352208] c38d75d8 0000002a 0000003a f5c20000 f61dd940 f4ccb840
00000000 00000106
[76976.352208] c3824000 f587e640 f587e69c c38d75b8 f5feebc0 f8e424ef
f67e0a70 f5feec04
[76976.352208] c38d75b8 c38d75b8 f5d0086c 00000000 f5d00848 c3824108
00000001 f89386a8
[76976.352208] Call Trace:
[76976.352208] [<f8e424ef>] ppp_push+0x52/0x411 [ppp_generic]
[76976.352208] [<c01162ee>] default_spin_lock_flags+0x5/0x7
[76976.352208] [<f8e42f5f>] ppp_xmit_process+0x3ac/0x422 [ppp_generic]
[76976.352208] [<f8e430e2>] ppp_start_xmit+0x10d/0x126 [ppp_generic]
[76976.352208] [<c0280b90>] dev_hard_start_xmit+0x1e2/0x24b
[76976.352208] [<c028ef0c>] __qdisc_run+0xba/0x19a
[76976.352208] [<c0281022>] dev_queue_xmit+0x34a/0x443
[76976.352208] [<c02a03c8>] ip_finish_output2+0x18e/0x1b8
[76976.352208] [<c029f904>] ip_local_out+0x15/0x17
[76976.352208] [<c02a00bd>] ip_queue_xmit+0x2f1/0x338
[76976.352208] [<c027eccb>] net_tx_action+0x62/0x123
[76976.352208] [<c027bf27>] verify_iovec+0x3e/0x6b
[76976.352208] [<c02754f5>] sys_sendmsg+0x184/0x1e3
[76976.352208] [<c02b232b>] tcp_v4_send_check+0x7a/0xb0
[76976.352208] [<c02aee28>] tcp_transmit_skb+0x576/0x5ad
[76976.352208] [<c0276130>] sys_recvfrom+0xb4/0x116
[76976.352208] [<c02b0f2a>] tcp_write_xmit+0x7ea/0x8c5
[76976.352208] [<c027647d>] sys_accept4+0x18c/0x1dc
[76976.352208] [<c027b03c>] __alloc_skb+0x45/0xef
[76976.352208] [<c02b104b>] __tcp_push_pending_frames+0x1e/0x50
[76976.352208] [<c02a55dc>] tcp_close+0x131/0x33d
[76976.352208] [<c02bea69>] inet_release+0x3f/0x44
[76976.352208] [<c027561c>] sock_release+0x11/0x59
[76976.352208] [<c027567d>] sock_close+0x19/0x1c
[76976.352208] [<c018835d>] __fput+0xa6/0x135
[76976.352208] [<c0185c75>] filp_close+0x4e/0x54
[76976.352208] [<c0185cdf>] sys_close+0x64/0x9f
[76976.352208] [<c010341b>] sysenter_do_call+0x12/0x2f
[76976.352208] [<c02e0000>] mxcsr_feature_mask_init+0x1b/0x4d
[76976.352208] Code: 83 c0 18 f0 ff 42 18 89 53 08 c7 43 68 b2 da 16 f8 8a
42 28 83 e0 0c 3c 04 75 09 80 63 64 f3 e9 bc 00 00 00 8b 43 18 8b 4c 24 08
<8b> 40 0c 8d 79 11 f6 40 44 0e 8a 43 64 75 55 6a 00 8b 4c 24 0c
[76976.352208] EIP: [<f816e4fc>] pppol2tp_xmit+0x2a9/0x3f9 [pppol2tp]
SS:ESP 0068:f593fccc
[76976.358702] ---[ end trace 8ed1cadc1a5d2e4a ]---
[76976.358761] Kernel panic - not syncing: Fatal exception in interrupt