** Description changed:

  In my PC i have 2 NICs, on eth0 i have a built-in NIC of an unknown 
brand/type and on eth1 i have a 3Com 3C900b-TPO.
  Eth1 connect to the internet, eth0 is the LAN.
  
  The problem is with eth1. Since my upgrade to Feisty "the internet" stops 
responding.
  At first i thought it was a DNS issue, but discarded that idea after i've 
found that IP addresses outside my LAN couldn't even be pinged at that time.
  
  I've tried restarting networking by executing "/etc/init.d/networking 
restart" but that didn't help.
  Restarting the PC helped for a while, but that is hardly a solution to the 
problem since i am running a shoutcast server and an FTP server which i really 
want to keep available at all times.
  
  I've found the following in /var/log/syslog:
  
  [ 2442.499383] NETDEV WATCHDOG: eth1: transmit timed out
  [ 2442.499396] eth1: transmit timed out, tx_status 00 status 8601.
  [ 2442.499405]   diagnostics: net 0cc8 media 8880 dma 0000003a fifo 8800
  [ 2442.499410] eth1: Interrupt posted but not delivered -- IRQ blocked by 
another device?
  [ 2442.499517]   Flags; bus-master 1, dirty 169764(4) current 169764(4)
  [ 2442.499521]   Transmit list 00000000 vs. dfa4e480.
  [ 2442.499526]   0: @dfa4e200  length 8000002a status 0001002a
  [ 2442.499529]   1: @dfa4e2a0  length 8000002a status 0001002a
  [ 2442.499533]   2: @dfa4e340  length 8000002a status 8001002a
  [ 2442.499536]   3: @dfa4e3e0  length 8000002a status 8001002a
  [ 2442.499539]   4: @dfa4e480  length 80000036 status 00010036
  [ 2442.499543]   5: @dfa4e520  length 8000004a status 0001004a
  [ 2442.499546]   6: @dfa4e5c0  length 8000004a status 0001004a
  [ 2442.499549]   7: @dfa4e660  length 8000002a status 0001002a
  [ 2442.499552]   8: @dfa4e700  length 8000002a status 0001002a
  [ 2442.499555]   9: @dfa4e7a0  length 8000002a status 0001002a
  [ 2442.499559]   10: @dfa4e840  length 8000002a status 0001002a
  [ 2442.499562]   11: @dfa4e8e0  length 8000002a status 0001002a
  [ 2442.499566]   12: @dfa4e980  length 8000002a status 0001002a
  [ 2442.499569]   13: @dfa4ea20  length 8000002a status 0001002a
  [ 2442.499572]   14: @dfa4eac0  length 8000002a status 0001002a
  [ 2442.499576]   15: @dfa4eb60  length 8000002a status 0001002a
  [ 2442.499580] eth1: Resetting the Tx ring pointer.
  
  The times of these entries coincide with the times that the NIC stops
  responding.
  
  The problems started after upgrading the kernel to 2.6.20. I'm currently 
running the 2.6.17 kernel without problems so i've ruled out the option of it 
being a hardware issue.
  The driver used in both kernels is 3c59x, which suprized me since the 3c59x 
line was an ISA card and the 3c90x is a (non-wireless) PCI card.
+ 
+ [Edit 05-05-2007]
+ See also http://ubuntuforums.org/showthread.php?t=417032
+ Bug seems to be related to having 2 NICs in one system.
+ [/Edit]

** Tags added: 3c59x 3c900 3c905 3c90x 3com

-- 
3com NIC stops working after some time
https://bugs.launchpad.net/bugs/109629
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