Public bug reported:

Binary package hint: linux-image-2.6.24-16-server

I'm running Ubuntu Server on a machine with two network cards acting as
a file server and gateway; eth0 is the external (Internet-facing)
interface.  The system has been running fine for almost a year.  Last
night, the external interface stopped passing traffic.  A "ifdown eth0;
ifup eth0" was enough to bring it back to life.  This morning, the same
thing happened, and it happened again this evening.  Since it doesn't
appear to be my ISP's problem, I looked at syslog and found the
following:

Oct 28 01:30:44 marajade kernel: [4799484.682357] NETDEV WATCHDOG: eth0: 
transmit timed out
Oct 28 01:30:44 marajade kernel: [4799484.682362] eth0: Got tx_timeout. irq: 
00000000
Oct 28 01:30:44 marajade kernel: [4799484.682363] eth0: Ring at 37578000
Oct 28 01:30:44 marajade kernel: [4799484.682364] eth0: Dumping tx registers
Oct 28 01:30:44 marajade kernel: [4799484.682367]   0: 00002000 000000ff 
00000003 03aa03ca 00000000 00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682370]  20: 00000000 00000000 
00000000 00000000 00000001 00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682373]  40: 0420e20e 0000a855 
00002e20 00000000 00000000 00000000 00000000 00000000

... many more lines ...

Oct 28 01:30:44 marajade kernel: [4799484.682553] 5c0: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682557] 5e0: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682562] 600: 00000000 00000000 
00000000 00000000 00000000 00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682563] eth0: Dumping tx ring
Oct 28 01:30:44 marajade kernel: [4799484.682565] 000: 00000000 3d260a02 
a000004d // 00000000 3d260002 a000004d // 00000000 7c4a2a02 a000004d // 
00000000 3d260802 a000004d
Oct 28 01:30:44 marajade kernel: [4799484.682568] 004: 00000000 3d260402 
a000004d // 00000000 7c4a2402 a000004d // 00000000 19a5f202 a000004d // 
00000000 19a5fc02 a000004d
Oct 28 01:30:44 marajade kernel: [4799484.682571] 008: 00000000 19a5fe02 
a000004d // 00000000 19a5f802 a000004d // 00000000 19a5fa02 a000004d // 
00000000 7c4a2002 a000004d

... many more lines ...

Oct 28 01:30:44 marajade kernel: [4799484.682738] 0f4: 00000000 00d9b4c6 
a0000049 // 00000000 19b3ca02 ac00006e // 00000000 72994402 ac000073 // 
00000000 00d9bcc6 a0000049
Oct 28 01:30:44 marajade kernel: [4799484.682741] 0f8: 00000000 00d9b0c6 
a0000049 // 00000000 19b3cc02 ac00006e // 00000000 72994802 ac000073 // 
00000000 012f8810 a0000048
Oct 28 01:30:44 marajade kernel: [4799484.682743] 0fc: 00000000 2d30b0c6 
a0000049 // 00000000 438f1cc6 a0000049 // 00000000 01303810 a0000067 // 
00000000 00000000 00000000
Oct 28 01:30:44 marajade kernel: [4799484.682789] eth0: tx_timeout: dead 
entries!

Google led me to this unanswered e-mail that looks like the same
problem: http://kerneltrap.org/mailarchive/linux-
netdev/2008/6/26/2240624/thread

Software is Ubuntu 8.04.1; linux-image 2.6.24-16-server.  Hardware is
AMD Opteron 1218 HE / Tyan S2925G2NR.  syslog, dmesg and lspci -vv
output are attached.  Note that I installed some updates and rebooted
the machine before filing this bug, so the output from dmesg and lspci
are from a slightly newer kernel (2.6.24-19).

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
NETDEV WATCHDOG: eth0: transmit timed out, eth0: tx_timeout: dead entries!
https://bugs.launchpad.net/bugs/290572
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