Similar here too. The machine disappears from the network until reboot.
The card is
01:01.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78)
Subsystem: 3Com Corporation 3C905C-TX Fast Etherlink for PC Management
NIC
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (2500ns min, 2500ns max), Cache Line Size: 16 bytes
Interrupt: pin A routed to IRQ 21
Region 0: I/O ports at b800 [size=128]
Region 1: Memory at e7dffc00 (32-bit, non-prefetchable) [size=128]
Expansion ROM at 50000000 [disabled] [size=128K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-
The first sign of the problem in syslog is
Jun 23 05:36:51 bettyboop kernel: [585849.763346] NETDEV WATCHDOG: eth0:
transmit timed out
Jun 23 05:36:51 bettyboop kernel: [585849.763356] eth0: transmit timed out,
tx_status 00 status 8601.
Jun 23 05:36:51 bettyboop kernel: [585849.799305] diagnostics: net 0cc6 media
8880 dma 0000003a fifo 0000
Jun 23 05:36:51 bettyboop kernel: [585849.838385] eth0: Interrupt posted but
not delivered -- IRQ blocked by another device?
Jun 23 05:36:51 bettyboop kernel: [585849.886389] Flags; bus-master 1, dirty
3633675(11) current 3633675(11)
Jun 23 05:36:51 bettyboop kernel: [585849.927012] Transmit list 00000000 vs.
ffff81003de608e0.
Jun 23 05:36:51 bettyboop kernel: [585849.960383] 0: @ffff81003de60200
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585849.998432] 1: @ffff81003de602a0
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.036482] 2: @ffff81003de60340
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.074531] 3: @ffff81003de603e0
length 8000005f status 0c01005f
Jun 23 05:36:51 bettyboop kernel: [585850.112582] 4: @ffff81003de60480
length 8000005f status 0c01005f
Jun 23 05:36:51 bettyboop kernel: [585850.150632] 5: @ffff81003de60520
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.188682] 6: @ffff81003de605c0
length 8000005f status 0c01005f
Jun 23 05:36:51 bettyboop kernel: [585850.226732] 7: @ffff81003de60660
length 8000005f status 0c01005f
Jun 23 05:36:51 bettyboop kernel: [585850.264782] 8: @ffff81003de60700
length 8000002a status 0001002a
Jun 23 05:36:51 bettyboop kernel: [585850.302832] 9: @ffff81003de607a0
length 8000002a status 8001002a
Jun 23 05:36:51 bettyboop kernel: [585850.340882] 10: @ffff81003de60840
length 8000002a status 8001002a
Jun 23 05:36:51 bettyboop kernel: [585850.379452] 11: @ffff81003de608e0
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.418021] 12: @ffff81003de60980
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.456591] 13: @ffff81003de60a20
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.495160] 14: @ffff81003de60ac0
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.534142] 15: @ffff81003de60b60
length 800005ea status 0c0105ea
Jun 23 05:36:51 bettyboop kernel: [585850.572717] eth0: Resetting the Tx ring
pointer.
--
RTL-8029: NETDEV WATCHDOG: eth1: transmit timed out
https://bugs.launchpad.net/bugs/87078
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