Date:	Fri, 16 May 2014 05:59:17 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Timo Teras <timo.teras@....fi>
Cc:	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: [bisected] [oops] gre/gro oops in skb_gro_receive+0x118/0x453

On Fri, 2014-05-16 at 10:40 +0300, Timo Teras wrote:
> The oops happens when forwarding traffic between ethX <-> gre. Where
> the GRE tunnel is an NBMA tunnel and the GRE traffic is IPsec'ed in
> transport mode. It seems that locally originating traffic to gre is not
> affected.
> 
> The oops also goes away if GRO is turned off for gre tunnel device.
> 
> I have bisected this always reproducible oops to commit:
> 
> 8a29111c7ca68d928dfab58636f3f6acf0ac04f7 is the first bad commit
> 
> commit 8a29111c7ca68d928dfab58636f3f6acf0ac04f7
> Author: Eric Dumazet <edumazet@...gle.com>
> Date: Oct 8 09:02:23 2013 -0700
> net: gro: allow to build full sized skb
> 
> This oops backtrace is from vanilla 3.14.4 kernel, but it is identical
> up to the offending commit.
> 
> [  286.927713] BUG: unable to handle kernel paging request at 2b90bdc8
> [  286.930813] IP: [<c120fc88>] skb_gro_receive+0x118/0x453
> [  286.930813] *pde = 00000000 
> [  286.930813] Oops: 0000 [#1] SMP 
> [  286.930813] Modules linked in: sha1_generic authenc esp4 xfrm4_mode_transport
> deflate ctr twofish_generic twofish_i586 twofish_common camellia_generic
> serpent_sse2_i586 xts lrw gf128mul serpent_generic glue_helper ablk_helper cryptd
> blowfish_generic blowfish_common cast5_generic cast_common des_generic cbc cmac
> xcbc rmd160 sha512_generic hmac crypto_null af_key xfrm_algo ip_gre ip_tunnel
> nf_conntrack_netbios_ns nf_conntrack_broadcast iptable_raw ipt_MASQUERADE
> iptable_nat nf_nat_ipv4 nf_nat ipt_REJECT xt_helper nf_conntrack_ipv4
> nf_defrag_ipv4 iptable_filter ip_tables nf_conntrack_ftp nf_conntrack_sip
> xt_CT ip6table_raw xt_LOG xt_limit xt_policy xt_tcpudp nf_conntrack_ipv6
> nf_defrag_ipv6 xt_recent xt_multiport xt_conntrack nf_conntrack ip6table_filter
> ip6_tables x_tables ipv6 af_packet mousedev via_rng rng_core via_cputemp hwmon
> hwmon_vid padlock_aes padlock_sha serio_raw psmouse pcspkr shpchp i2c_viapro
> i2c_core via_rhine snd_via82xx snd_ac97_codec snd_pcm snd_timer ac97_bus
> snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore firewire_ohci
> firewire_core crc_itu_t via_agp agpgart r8169 firmware_class mii fan evdev
> parport_pc parport thermal button acpi_cpufreq processor nls_utf8 nls_cp437
> vfat fat sata_via ehci_pci ehci_hcd uhci_hcd pata_via pata_acpi ata_generic
> libata usb_storage usbcore usb_common sd_mod scsi_mod crc_t10dif
> crct10dif_common squashfs loop
> [  286.930813] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.4 #1-fragbisect
> [  286.930813] Hardware name:    /CN700-8237, BIOS 6.00 PG 08/06/2008
> [  286.930813] task: c13e8930 ti: f6408000 task.ti: c13de000
> [  286.930813] EIP: 0060:[<c120fc88>] EFLAGS: 00210202 CPU: 0
> [  286.930813] EIP is at skb_gro_receive+0x118/0x453
> [  286.930813] EAX: 2b90bdc8 EBX: e9f669c0 ECX: 00000034 EDX: 00000596
> [  286.930813] ESI: e9f669c0 EDI: f648f134 EBP: f6409eb4 ESP: f6409e7c
> [  286.930813]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [  286.930813] CR0: 8005003b CR2: 2b90bdc8 CR3: 2a731000 CR4: 00000690
> [  286.930813] Stack:
> [  286.930813]  c120df4b e9f4f796 00000046 00000000 f648f134 c013a600 0000007a e9f4fd40
> [  286.930813]  2b90bdc8 00000034 e9f663c0 e9f663c0 e9f669c0 f648f134 f6409ee0 c125cc6f
> [  286.930813]  00000000 00000020 00000046 2e001080 e9f4ed96 00000562 e9f663c0 e9f4f782
> [  286.930813] Call Trace:
> [  286.930813]  [<c120df4b>] ? csum_partial_ext+0x16/0x18
> [  286.930813]  [<c125cc6f>] tcp_gro_receive+0x1a8/0x218
> [  286.930813]  [<c125cd9f>] tcp4_gro_receive+0xc0/0xc8
> [  286.930813]  [<c1268439>] inet_gro_receive+0x1c5/0x1df
> [  286.930813]  [<c1219a15>] dev_gro_receive+0x231/0x393
> [  286.930813]  [<f80e006b>] ? rh_timer_func+0x8/0xa [usbcore]
> [  286.930813]  [<c1219c1c>] napi_gro_receive+0xb/0x5e
> [  286.930813]  [<f8650056>] gro_cell_poll+0x56/0x73 [ip_tunnel]
> [  286.930813]  [<c121a2da>] net_rx_action+0xb0/0x14d
> [  286.930813]  [<c1030d43>] __do_softirq+0xb8/0x1a5
> [  286.930813]  [<c1030c8b>] ? cpu_callback+0xec/0xec
> [  286.930813]  <IRQ> 
> [  286.930813]  [<c1030fa5>] ? irq_exit+0x44/0x81
> [  286.930813]  [<c1002da0>] ? do_IRQ+0x9f/0xb3
> [  286.930813]  [<c106e642>] ? clockevents_notify+0x10f/0x116
> [  286.930813]  [<c1298d33>] ? common_interrupt+0x33/0x40
> [  286.930813]  [<c11f0292>] ? cpuidle_enter_state+0x39/0xa3
> [  286.930813]  [<c11f03a5>] ? cpuidle_idle_call+0xa9/0xe6
> [  286.930813]  [<c1007f8f>] ? arch_cpu_idle+0x8/0x1c
> [  286.930813]  [<c1060542>] ? cpu_startup_entry+0xf3/0x159
> [  286.930813]  [<c128b36b>] ? rest_init+0x5d/0x5f
> [  286.930813]  [<c1415a17>] ? start_kernel+0x3b2/0x3b8
> [  286.930813]  [<c141549b>] ? repair_env_string+0x51/0x51
> [  286.930813]  [<c14152d0>] ? i386_start_kernel+0x7a/0x7e
> [  286.930813] Code: 54 29 56 50 c7 46 54 00 00 00 00 29 d1 89 8e b4 00 00 00
> e9 09 03 00 00 8b 45 f0 f6 80 87 00 00 00 01 8b 45 e8 0f 84 cf 00 00 00
> <8a> 00 88 45 d8 0f b6 d0 8b 45 f0 8b 80 ac 00 00 00 89 45 d4 05
> [  286.930813] EIP: [<c120fc88>] skb_gro_receive+0x118/0x453 SS:ESP 0068:f6409e7c
> [  286.930813] CR2: 000000002b90bdc8
> [  286.930813] ---[ end trace ac04411e60d3534c ]---
> [  286.930813] Kernel panic - not syncing: Fatal exception in interrupt
> [  286.930813] Kernel Offset: 0x0 from 0xc1000000 (relocation range: 0xc0000000-0xf7ffdfff)
> --

Unffortunately bisecting wont help a lot, as we knew the commit was
faulty.

Please check 9d8506cc2d7ea1f911c72c100193a3677f6668c3



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