linux-kernel - weird bug on r8169 with usb

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Date:	Wed, 25 Jun 2008 00:18:37 +0200
From:	David CHANIAL <david.ml@...o-web.fr>
To:	linux-kernel@...r.kernel.org
Subject: weird bug on r8169 with usb

Hi (Please excuse my bad english),

I think is there a bug on my linux box :
I hope you can say me that it is really a bug, or if i have to consider myself as bug :)

If i boot my system/kernel with usb devices plugged, eth0 is detected but unusable.
I unplug the usb devices, kernel boot, and eth0 is usable.
The bug is reproducible as much as necessary.

More informations :
(if you need more informations, ask, i will reply)

When i say that eth0 is unusable, i can see there no dhcp request can make a success.

I've seen the bug with :
	linux-2.6.24-gentoo-r8
	linux-2.6.25-gentoo-r5

I can test with a vanilla kernel (without the gentoo patches) but i "think" is there no link with the gentoo patches.
(Ask if necessary)

# lspci | grep Ether
 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev ff)

# dmesg | grep eth0 # without the bug
 eth0: RTL8168c/8111c at 0xf8828000, 00:1e:8c:c4:66:7d, XID 3c2000c0 IRQ 18
 r8169: eth0: link up
 eth0: no IPv6 routers present

# dmesg | grep eth0 # with the bug
 eth0: RTL8168c/8111c at 0xf8828000, 00:1e:8c:c4:66:7d, XID 3c2000c0 IRQ 18
 r8169: eth0: link up
 eth0: no IPv6 routers present
 NETDEV WATCHDOG: eth0: transmit timed out
 r8169: eth0: link up
 [...] last twho lines repeat slowly but continually [...]

# cat /proc/interrupts  | grep eth0
 18:          3          4          3          3   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb7, eth0

# diff -U0 without_devices with_devices 
--- without_devices	2008-06-25 00:13:29.000000000 +0200
+++ with_devices	2008-06-25 00:14:00.000000000 +0200
@@ -7,0 +8 @@
+Bus 002 Device 007: ID 132b:2001 Konica Minolta 
@@ -12,0 +14 @@
+Bus 001 Device 003: ID 04b8:012e Seiko Epson Corp.


Thanks a lot.

Best regards,
-- 
David CHANIAL
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