netdev - Re: kernel panic with time-stamping in phy devices (monitor mode)

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Date:	Thu, 2 Dec 2010 10:21:22 -0800 (PST)
From:	Andrew Watts <akwatts@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: kernel panic with time-stamping in phy devices (monitor mode)

--- On Thu, 12/2/10, Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le jeudi 02 décembre 2010 à 08:05
> -0800, Andrew Watts a écrit :
> > Hi.
> > 
> > The 'time stamping in phy devices' code introduced in
> 2.6.36
> > (c1f19b51d1d87f3e3bb7e6648f43f7d57ed2da6b et al.)
> triggers
> > kernel panics when wireless devices are placed in
> monitor mode
> > (tested with b43 and ath5k devices on a 32-bit
> system).
> > 
> > To reproduce, set CONFIG_NETWORK_PHY_TIMESTAMPING=y
> and put a
> > wireless device into monitor mode:
> > 
> >  # ifconfig wlan0 down
> >  # iwconfig wlan0 mode monitor 
> >  # ifconfig wlan0 up
> > 
> > ~ Andy
> > 
> > ==============
> > 
> >  [<c14455ad>] ? __alloc_skb+0x53/0xf8
> >  [<f92fdd57>] ? b43_dma_rx+0x18a/0x342
> [b43]
> >  [<f92e8475>] ?
> b43_do_interrupt_thread+0x420/0x92e [b43]
> >  [<c1027731>] ? __dequeue_entity+0x31/0x35
> >  [<c1027a44>] ? set_next_entity+0xad/0xbb
> >  [<f92e899b>] ?
> b43_interrupt_thread_handler+0x18/0x2b [b43]
> >  [<c107c378>] ? irq_thread+0xb6/0x19e
> >  [<c15625a0>] ? schedule+0x254/0x566
> >  [<c107c2c2>] ? irq_thread+0x0/0x19e
> >  [<c10448b1>] ? kthread+0x67/0x69
> >  [<c104484a>] ? kthread+0x0/0x69
> >  [<c100323e>] ?
> kernel_thread_helper+0x6/0x18
> > Code: 4c 24 14 8b 88 a8 00 00 00 89 4c 24 10 89 54 24
> 0c 8b
> > 40 50 89 44 24 08 8b 45 04 89 44 24 04 c7 04 24 30 74
> 7a c1
> > e8 b5 d2 11 00 <0f> 0b eb fe 55 89 e5 56 53 83
> ec 24 8b 88
> > a0 00 00 00 8b 58 54
> > EIP: [<c1444ea0>] skb_push+0x7d/0x81 SS:ESP
> 0068:cee01d78
> > ---[ end trace af1c99818e62b195 ]---
> > Kernel panic - not syncing: Fatal exception in
> interrupt
> > Pid: 6674, comm: irq/18-b43 Tainted: G 
>    D     2.6.36.1
> > Call Trace:
> >  [<c156217d>] ? printk+0x28/0x2a
> >  [<c156205c>] panic+0x57/0x150
> >  [<c1564adf>] oops_begin+0x0/0x40
> >  [<c1004e36>] die+0x49/0x5d
> >  [<c1564304>] do_trap+0x84/0xad
> >  [<c10037e5>] ? do_invalid_op+0x0/0x93
> >  [<c100386b>] do_invalid_op+0x86/0x93
> >  [<c1444ea0>] ? skb_push+0x7d/0x81
> >  [<c15640b9>] error_code+0x65/0x6c
> >  [<c1444ea0>] ? skb_push+0x7d/0x81
> >  [<c145f721>] ?
> skb_defer_rx_timestamp+0x12/0x5a
> >  [<c145f721>]
> skb_defer_rx_timestamp+0x12/0x5a
> >  [<c144d23c>] netif_receive_skb+0x1f/0x47
> >  [<c153a6e8>] ieee80211_rx+0x661/0x8e1
> >  [<f85daca2>] ? ssb_pci_read32+0x19/0x31
> [ssb]
> >  [<f92e54cf>] ? b43_tsf_read+0x2a/0x47
> [b43]
> >  [<f92f8d42>] b43_rx+0x24c/0x5eb [b43]
> >  [<c14455ad>] ? __alloc_skb+0x53/0xf8
> >  [<f92fdd57>] b43_dma_rx+0x18a/0x342 [b43]
> >  [<f92e8475>]
> b43_do_interrupt_thread+0x420/0x92e [b43]
> >  [<c1027731>] ? __dequeue_entity+0x31/0x35
> >  [<c1027a44>] ? set_next_entity+0xad/0xbb
> >  [<f92e899b>]
> b43_interrupt_thread_handler+0x18/0x2b [b43]
> >  [<c107c378>] irq_thread+0xb6/0x19e
> >  [<c15625a0>] ? schedule+0x254/0x566
> >  [<c107c2c2>] ? irq_thread+0x0/0x19e
> >  [<c10448b1>] kthread+0x67/0x69
> >  [<c104484a>] ? kthread+0x0/0x69
> >  [<c100323e>]
> kernel_thread_helper+0x6/0x18
> > 
> > 
> 
> Thanks for the report
> 
> Please try following patch.
> 
> diff --git a/net/core/timestamping.c
> b/net/core/timestamping.c
> index dac7ed6..a710ab0 100644
> --- a/net/core/timestamping.c
> +++ b/net/core/timestamping.c
> @@ -96,7 +96,10 @@ bool skb_defer_rx_timestamp(struct
> sk_buff *skb)
>      struct phy_device *phydev;
>      unsigned int type;
>  
> -    skb_push(skb, ETH_HLEN);
> +    if (skb->data - ETH_HLEN <
> skb->head)
> +        return false;
> +
> +    __skb_push(skb, ETH_HLEN);
>  
>      type = classify(skb);
>   

I can confirm that I get no kernel panics after
applying that patch.

~ Andy



      
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