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port-i386/45494: bge0 watchdog timeout

>Number:         45494
>Category:       port-i386
>Synopsis:       bge0 watchdog timeout
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 19 07:00:00 +0000 2011
>Originator:     Riccardo
>Release:        5.99.56
NetBSD grid 5.99.56 NetBSD 5.99.56 (nc6120) #2: Tue Oct 18 11:08:54 CEST 2011  
root@grid:/usr/obj/sys/arch/i386/compile/nc6120 i386

The network card will interrupt from time to time, the following message 

bge0: watchdog timeout -- resetting
bge0: block failed to stop: reg 0x2c00, bit 0x00000002
bge0: block failed to stop: reg 0xc00, bit 0x00000002 

After a bit, connection will usually resume, enough to have dropped any 
exported X session, telnet session, etc.

 ifconfig bge0
        address: 00:14:c2:d9:1f:f1
        media: Ethernet autoselect (100baseTX 
        status: active
        inet netmask 0xffffff00 broadcast
        inet6 fe80::214:c2ff:fed9:1ff1%bge0 prefixlen 64 scopeid 0x3

dmesg | grep bge0
bge0 at pci2 dev 14 function 0: Broadcom BCM5705M Gigabit Ethernet
bge0: interrupting at ioapic0 pin 16
bge0: ASIC BCM5705 A3 (0x3003), Ethernet address 00:14:c2:d9:1f:f1
bge0: setting short Tx thresholds
brgphy0 at bge0 phy 1: BCM5705 1000BASE-T media interface, rev. 2

Usually under machine load or under heavier network load, like X11 exporting 
and un-minimizing a window.

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