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Date:	Mon, 18 Jun 2007 12:51:18 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: sky bugs in 2.6.22-rc5

On Mon, 18 Jun 2007 21:49:49 +0200
Patrick McHardy <kaber@...sh.net> wrote:

> sky2 breaks reproducably in 2.6.22-rc5 when setting the interface
> down and up again. Packets are not received on the other side,
> after a short time tcpdump (on the sky2 side) shows
> use-after-free patterns:
> 

Haven't seen this, but seems odd.

> IP6 (hlim 255, next-header: ICMPv6 (58), length: 16)
> fe80::215:f2ff:fe24:91f8 > ff02::2: [icmp6
>  sum ok] ICMP6, router solicitation, length 16
>           source link-address option (1), length 8 (1): 00:15:f2:24:91:f8
> arp who-has 192.168.0.1 tell 192.168.0.100
> 5a:5a:5a:5a:5a:5a > 5a:5a:5a:5a:5a:5a, ethertype Unknown (0x5a5a),
> length 219:
>         0x0000:  5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a  ZZZZZZZZZZZZZZZZ
>         0x0010:  5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a  ZZZZZZZZZZZZZZZZ
>         0x0020:  5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a  ZZZZZZZZZZZZZZZZ
>         0x0030:  5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a  ZZZZZZZZZZZZZZZZ
>         0x0040:  5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a 5a5a  ZZZZZZZZZZZZZZZZ
>         0x0050:  5a5a                                     ZZ
> 
> 
> 
> Additionally I get this oops when using netconsole and setting
> the device down and up again:
> 
> sky2 eth0: disabling interface
> 
> sky2 eth0: enabling interface
> Unable to handle kernel NULL pointer dereference at 0000000000000be4 RIP:
>  [<ffffffff81162c6c>] sky2_xmit_frame+0x2c5/0x478
> PGD 1338e4067 PUD 133945067 PMD 0
> Oops: 0002 [1] PREEMPT SMP
> CPU 1
> Modules linked in: nfsd exportfs ppdev lp nfs lockd nfs_acl sunrpc
> deflate zlib_deflate zlib_inflate twofish twofish_common camellia
> serpent blowfish des cbc ecb blkcipher aes xcbc sha256 crypto_null
> af_key rfcomm l2cap fuse nfnetlink_queue nfnetlink_log
> nf_conntrack_netlink nf_nat nf_conntrack_ipv6 nf_conntrack_ipv4
> nf_conntrack nfnetlink ip6_tables ip_tables x_tables hangcheck_timer
> cpufreq_ondemand powernow_k8 freq_table video backlight thermal
> processor fan ide_generic ide_disk ide_cd cdrom generic usbhid hid
> hci_usb bluetooth snd_mpu401 snd_via82xx snd_mpu401_uart snd_seq_dummy
> snd_seq_oss snd_via82xx_modem snd_ac97_codec ac97_bus snd_pcm_oss
> snd_mixer_oss snd_seq_midi snd_seq_midi_event snd_seq snd_pcm evdev
> snd_timer snd_rawmidi snd_seq_device via82cxxx psmouse serio_raw
> parport_pc parport pcspkr snd soundcore snd_page_alloc i2c_viapro
> ehci_hcd ide_core uhci_hcd
> Pid: 5015, comm: ifconfig Not tainted 2.6.22-rc5 #2
> RIP: 0010:[<ffffffff81162c6c>]  [<ffffffff81162c6c>]
> sky2_xmit_frame+0x2c5/0x478
> RSP: 0018:ffff81013ecd1a08  EFLAGS: 00010082
> RAX: 00000000ffffffc1 RBX: ffff81013f6ca8c0 RCX: 0000000000000be0
> RDX: 000000000000017c RSI: 0000000000000000 RDI: ffff81013f79e578
> RBP: ffff81013ecd1a48 R08: 0000000000000000 R09: 000000013d25805a
> R10: 0000000057afde91 R11: 0000000000000004 R12: ffff81013d4d3078
> R13: 0000000000000048 R14: 0000000000000000 R15: 0000000000000048
> FS:  00002b708f7bb6f0(0000) GS:ffff81013fc7a4c8(0000) knlGS:00000000f7e566c0
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000be4 CR3: 000000013393b000 CR4: 00000000000006e0
> Process ifconfig (pid: 5015, threadinfo ffff81013ecd0000, task
> ffff810133c9a0c0)
> Stack:  ffff81013f6ca000 ffff81013f6ca000 ffff81013fc994d0 0000000000000082
>  ffff81013f6ca000 0000000000000000 ffff81013ec30b90 ffff81013d4d3078
>  ffff81013ecd1aa8 ffffffff811baae2 000000000000002c 000000140000004a
> Call Trace:
>  [<ffffffff811baae2>] netpoll_send_skb+0xd9/0x15a
>  [<ffffffff811bb999>] netpoll_send_udp+0x26c/0x27b
>  [<ffffffff81164249>] write_msg+0x4c/0x7b
>  [<ffffffff8102a92c>] __call_console_drivers+0x62/0x73
>  [<ffffffff8102a9ac>] _call_console_drivers+0x6f/0x73
>  [<ffffffff8102ab30>] release_console_sem+0x14c/0x1f7
>  [<ffffffff8102b097>] vprintk+0x28e/0x306
>  [<ffffffff8102b176>] printk+0x67/0x69
>  [<ffffffff811b269c>] dev_mc_upload+0x19/0x43
>  [<ffffffff8115fd08>] sky2_up+0x90/0x6d0
>  [<ffffffff811b06bf>] dev_open+0x37/0x78
>  [<ffffffff811ae59a>] dev_change_flags+0x5d/0x120
>  [<ffffffff811f39e7>] devinet_ioctl+0x24a/0x5be
>  [<ffffffff811f446a>] inet_ioctl+0x82/0xa0
>  [<ffffffff811a3fdf>] sock_ioctl+0x1c8/0x1ea
>  [<ffffffff81084cd0>] do_ioctl+0x2c/0xba
>  [<ffffffff81084faf>] vfs_ioctl+0x251/0x26e
>  [<ffffffff8108500e>] sys_ioctl+0x42/0x68
>  [<ffffffff81009d9e>] system_call+0x7e/0x83
> 
> 
> Code: 66 44 89 79 04 44 89 09 88 41 07 44 88 71 06 48 89 c8 48 2b
> 
> 
> The reason for the second problem seems to be that sky2 enables
> the queue too early and netconsole sends packets before
> initialization is complete when sky2_up() prints a message.
 
Are you using large MTU?
 


-- 
Stephen Hemminger <shemminger@...ux-foundation.org>

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