kernel general protection fault -


i backporting driver called gtp 4.9 linux kernel 3.18 version. fixed errors in source code of driver , compiled kernel successfully. using ubuntu server 14.04 test kernel driver. (there netlink library (libgtpnl) control driver. modprobe gtp , there no problem. use library control functions of driver, , there no problem. however, strangely, when enable forwarding: (echo 1 > /proc/sys/net/ipv4/ip_forward) kernel somehow haults. unable many network commands (ifconfig, iproute, etc)

the dmesg shows: 

[   33.032315] gtp: gtp module loaded (pdp ctx size 88 bytes) [   62.269996] general protection fault: 0000 [#1] smp  [   62.270028] modules linked in: gtp(e) udp_tunnel(e) pci_stub(e) vboxpci(oe) vboxnetadp(oe) vboxnetflt(oe) vboxdrv(oe) nfnetlink_queue(e) nfnetlink_log(e) nfnetlink(e) coretemp(e) crct10dif_pclmul(e) ppdev(e) crc32_pclmul(e) ghash_clmulni_intel(e) vmw_balloon(e) btusb(e) bluetooth(e) aesni_intel(e) aes_x86_64(e) lrw(e) gf128mul(e) glue_helper(e) ablk_helper(e) cryptd(e) microcode(e) serio_raw(e) snd_ens1371(e) snd_ac97_codec(e) ac97_bus(e) gameport(e) snd_rawmidi(e) snd_seq_device(e) snd_pcm(e) snd_timer(e) snd(e) soundcore(e) vmwgfx(e) ttm(e) drm_kms_helper(e) drm(e) shpchp(e) vmw_vmci(e) i2c_piix4(e) parport_pc(e) mac_hid(e) lp(e) parport(e) hid_generic(e) usbhid(e) hid(e) psmouse(e) ahci(e) libahci(e) e1000(e) mptspi(e) mptscsih(e) mptbase(e) floppy(e) vmw_pvscsi(e) vmxnet3(e) pata_acpi(e) [   62.271080] cpu: 1 pid: 1323 comm: bash tainted: g           oe  3.18.20-bondingv4 #7 [   62.271121] hardware name: vmware, inc. vmware virtual platform/440bx desktop reference platform, bios 6.00 07/31/2013 [   62.271293] task: ffff8800772c9920 ti: ffff880079390000 task.ti: ffff880079390000 [   62.271329] rip: 0010:[<ffffffff81669a5d>]  [<ffffffff81669a5d>] dev_disable_lro+0x2d/0x130 [   62.271465] rsp: 0018:ffff880079393df8  eflags: 00010206 [   62.271492] rax: 0000000000200000 rbx: 0002000000000000 rcx: 0000000000000000 [   62.271595] rdx: ffffffff81ce6d98 rsi: 0000000000000000 rdi: ffff8800795ed000 [   62.271630] rbp: ffff880079393e18 r08: 0000000000000000 r09: ffff88007e4361a0 [   62.271664] r10: ffffffff8165266f r11: ffffea0001dd5480 r12: ffffffff81ce2e00 [   62.271703] r13: ffffffff81ce2ec8 r14: ffff880079393f50 r15: ffff8800795ed000 [   62.271798] fs:  00007fcfa02e8740(0000) gs:ffff88007e420000(0000) knlgs:0000000000000000 [   62.271838] cs:  0010 ds: 0000 es: 0000 cr0: 0000000080050033 [   62.271866] cr2: 00007ffe943a5ac8 cr3: 00000000782e6000 cr4: 00000000001407e0 [   62.271964] stack: [   62.271978]  ffffffff81ce2e00 0000000000000001 ffffffff81ce2e00 ffffffff81ce2ec8 [   62.272078]  ffff880079393e68 ffffffff816da5a2 0000000000000000 0000000000000002 [   62.272774]  ffffffff81ce8b40 0000000000000001 ffffffffffffffea ffffffff81ce8b40 [   62.273379] call trace: [   62.274042]  [<ffffffff816da5a2>] devinet_sysctl_forward+0x1c2/0x1f0 [   62.274940]  [<ffffffff8124bf23>] proc_sys_call_handler+0xb3/0xc0 [   62.275504]  [<ffffffff8124bf44>] proc_sys_write+0x14/0x20 [   62.276157]  [<ffffffff811db457>] vfs_write+0xb7/0x1f0 [   62.276795]  [<ffffffff811dbed6>] sys_write+0x46/0xb0 [   62.277394]  [<ffffffff81786914>] ? int_check_syscall_exit_work+0x34/0x3d [   62.278080]  [<ffffffff8178668d>] system_call_fastpath+0x16/0x1b [   62.278753] code: 44 00 00 55 48 89 e5 41 55 41 54 53 48 89 fb 48 83 ec 08 8b 87 0c 02 00 00 a8 01 75 39 a9 00 00 20 00 74 07 48 8b 9b f0 08 00 00 <48> 81 a3 e0 00 00 00 ff 7f ff ff 48 89 df e8 80 ff ff ff f6 83  [   62.282203] rip  [<ffffffff81669a5d>] dev_disable_lro+0x2d/0x130 [   62.282925]  rsp <ffff880079393df8> [   62.283664] ---[ end trace f2a66d8a2b1df752 ]--- [   62.289214] init: tty2 main process ended, respawning

there answers related kernel taint driver seems have no license. has, dont why kernel didnt realize it. couldn't find how driver uses dev_disable_lro. couldnt move through. identify problem appreciated. thanks


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