I'm getting these symptoms ever since I upgraded from Ubuntu 10.10 to
11.04. Before the update the system used to be very stable and stay up
for weeks without rebooting. The only reason to reboot was after
security updates. Now the system tends to randomly hang hard (not ping-
able) about once a week. Going over the kernel log I noticed lots of
these "r8169 0000:02:00.0: eth0: link up messages.".

I've tried different graphics cards and graphics drivers (radeon and
fglrx) to rule out a proprietary graphics driver problem. At this point
I'm blaming it on the network.

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI 
Express Gigabit Ethernet controller (rev 03)
        Subsystem: ASUSTeK Computer Inc. M4A785TD Motherboard
        Flags: bus master, fast devsel, latency 0, IRQ 45
        I/O ports at c800 [size=256]
        Memory at fafff000 (64-bit, prefetchable) [size=4K]
        Memory at faff8000 (64-bit, prefetchable) [size=16K]
        Expansion ROM at fbcf0000 [disabled] [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: r8169
        Kernel modules: r8169

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https://bugs.launchpad.net/bugs/787704

Title:
  r8169 ethernet crashes linux

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