On Tue, 2014-04-15 at 01:01 +0800, Zhan Jianyu wrote: > On Mon, Apr 14, 2014 at 11:19 PM, James Chapman <jchap...@katalix.com> wrote: > > Please send the complete oops message. > > Hi, complete oops message is : > > > [ 100.243737] BUG: unable to handle kernel NULL pointer dereference > at 00000000000002c0 > [ 100.244985] IP: [<ffffffff815d4cb0>] ip_queue_xmit+0x20/0x3e0 > [ 100.262266] PGD 0 > [ 100.288395] Oops: 0000 [#1] SMP > [ 100.325955] Modules linked in: l2tp-ppp l2tp-netlink l2tp_core > pppoe vmblock vsock vmmemctl vmhgfs acpiphp snd_ens1371 gameport > snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm > snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event > snd_seq snd_timer snd_seq_device ppdev psmouse serio_raw fbcon > tileblit font bitblit softcursor snd parport_pc soundcore > snd_page_alloc vmci i2c_piix4 vga16fb vgastate intel_agp agpgart > shpchp lp parport floppy pcnet32 mii mptspi mptscsih mptbase > scsi_transport_spi vmxnet > [ 1100.472178] CPU: 0 PID: 1849 Comm: pppd Tainted: G IOE > 3.15.0-rc1+ #13 > [ 1100.540018] Hardware name: LENOVO 20216/v2QY041, BIOS > 74CN34WW(v2.0k) 07/04/2013 > [ 1100.562844] task: ffff88003ee48000 ti: ffff880257a4e000 task.ti: > ffff880257a4e000 > [ 1100.584351] RIP: 0010: [<ffffffff815d4cb0>] [<ffffffff815d4cb0>] > ip_queue_xmit+0x20/0x3e0 > [ 1100.584351] RSP: 0018: ffff880257a4fdd8 EFLAGS: 00010293 > [ 1100.609358] RAX: ffff88003fe48e00 RBX:ffff88003f5ad100 > RCX:0000000000000014 > [ 1100.631467] RDX: ffffffff81ccab40 RSI: ffff88003fe49110 > RDI:ffff88003f5ad100 > [ 1100.657664] RBP: ffff880257a4fe00 R08: ffff88807ff06476 > R09:0000000000000022 > [ 1100.657694] R10: ffffe90009726600 R11: ffff88003fe49110 > R12:0000000000000000 > [ 1100.657694] R13: ffff88025a087480 R14: ffff880025b561400 > R15:ffff88003fe49110 > [ 1100.688994] FS: 00007f8857f8f840(0000) > GS:ffff88026f200000(0000) knlGS:000000000000 > [ 1100.697694] CS: 0010 DS: 0000 ES: 0000 CR0:0000000080050033 > [ 1100.697694] CR2:0000000000002c0 CR3: 0000000260190e00 CR4: > 00000000001407f0 > [ 1100.706083] Stack: > [ 1100.731783] ffff88025cadbe00 ffff88003fe48e00 0000000000000022 > ffff88025b561400 > [ 1100.759324] ffff88003f5ad100 ffff880257a4fe68 ffffffffa081a6e5 > ffff88003f5ad100 > [ 1100.811396] ffff880257a4fe28 ffffffff8158686e ffff880257a4fe68 > ffffffff000000008 > [ 1100.891922] Call Trace: > [ 1100.916257] [<ffffffffa081a6e5>] l2tp_xmit_skb+0x335/0x6c0 [l2tp_core] > [ 1100.943670] [<ffffffff8158686e>] ? skb_free_head+0x1e/0x80 > [ 1100.970905] [<ffffffffa0830da1>] pppol2tp_xmit+0x141/0x210 [l2tp_ppp] > [ 1100.995542] [<ffffffffa0805230>] ppp_channel_push+0x50/0xd0 [ppp_generic] > [ 1101.024087] [<ffffffffa0805523>] ppp_write+0xa3/0xec [ppp_generic] > [ 1101.133447] [<ffffffff811c7bfa>] vfs_write+0xba/0x1e0 > [ 1101.228987] [<ffffffff811c8746>] Sys_wirte+0x46/0xb0 > [ 1101.428494] [<ffffffff8110aca6>] ? __audit_syscall_exit+0x1f6/0x2a0 > [ 1101.898345] [<ffffffff816a90e9>] system_call_fastpath+0x16/0x1b > [ 1102.024087] Code: e9 31 fe ff ff 66 0f 1f 44 00 00 0f 1f 44 00 00 > 55 48 89 e5 41 57 49 89 f7 41 55 41 54 53 48 89 fb 4c 8b 67 18 4c 8b > 67 18 4c 8b 6f 58 <4d> 8b b4 24 c0 02 00 00 49 83 e5 fe 0f 84 3e 02 00 > 00 4d 85 f6 > [ 1102.879592] RIP: [<ffffffff815d4cb0>] ip_queue_xmit+0x20/0x3e0 > [ 1103.179592] RsP<FFFF880257A4FDD8> > [ 1103.834682] CR2: 00000000000002C0 > [ 1104.043682] kernel panic - not syncing: Fatal exception in interrupt > [ 1104.789539] Offset: 0x0 from 0xffffffff81000000 (relocation range: > 0xffffffff80000000-0xffffffff9fffffff) > > >Is this a regression? If so, do you know what the last kernel version > >was that worked? > > I think this is a regression. 3.14 is the good working version. Today, > after I updated to 3.15-rc1, evertime I tried connect my VPN, it > always panics. > --
Hmm, it seems commit 31c70d5956fc l2tp: keep original skb ownership is the problem. ip_queue_xmit() assumes the socket attached to skb is an inet socket. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/