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SubjectRe: netconsole system freeze when cable unplugged
On 10/03/07 13:38, Andi Kleen wrote:
> Simon Arlott <simon@fire.lp0.eu> writes:
>
>> On 09/03/07 20:42, Francois Romieu wrote:
>>> Simon Arlott <simon@fire.lp0.eu> :
>>>> When I unplug the cable the system just stops responding to
>>>> anything, at all. No message is printed to the console when the
>>>> cable is plugged back in.
>>> rtl8139_interrupt (spin_lock(&tp->lock))
>>> -> rtl8139_weird_interrupt
>>> -> rtl_check_media
>>> -> mii_check_media (printk(KERN_INFO "%s: link down\n", ...))
>>> [netpoll stuff here]
>>> -> rtl8139_poll_controller
>>> -> rtl8139_interrupt
>>> *deadlock*
>>> See below for my random stuff of the day. Feel free to open a PR at
>>> bugzilla.kernel.org if the issue does not go away.
>> The patch doesn't fix it, nothing changes. I'm not sure how this can
>> be debugged if printk won't work...
>
> earlyprintk can be called directly (early_printk()) and should
> work. It won't log over the network of course.

It also won't log over the serial console either :(
(but that's probably a good thing, it's slow enough to boot with tons
of messages to the display because of netconsole and nfs).

rtl8139_interrupt
-> spin_lock(&tp->lock)
-> rtl8139_weird_interrupt
-> rtl_check_media
-> mii_check_media
-> printk(KERN_INFO "%s: link down\n", ...)
-> wite_msg
-> local_irq_save
-> netpoll_send_udp
-> netpoll_send_skb
-> local_irq_save
-> dev->hard_start_xmit(..., ...)
rtl8139_start_xmit
-> spin_lock_irqsave
*deadlock*

--
Simon Arlott
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