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SubjectQUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

Ever since I put two ethernet-cards (cheap Winbond W89C940 based PCI NE2K
clones) in my BP-6 system, I've been experiencing intermittent network hangs. A
hang manifests itself as a total failure to communicate through either network
card, and can only be solved by rebooting. Removing and reloading the modules
does not fix the problem, only a reboot works.

I have searched high and low for possible causes, but I found no definite
answer. I suspect the problem may be hardware-related (the BP-6 can be tricky
sometimes), but I want to rule out software issues before I take the system
apart. So, my question: does anyone else experience these network-related
problems with a BP-6 based system? Or maybe other similar problems, where a
specific subsystem hangs an can only be revived by rebooting the box? The
network cards are currently in PCI4 and PCI5 (which should work, they are
NON-busmastering cards after all...), but relocating the cards does not solve
the problem. This problem has been nagging me ever since I moved to 2.3.x
(somewhere around 2.3.30). As it is intermittent, it is very difficult to pin
down. I suspect the APIC in not completely sane, or some timing on the bus is
out of spec, but that's no more than a suspicion. And since I do not have
access to a logic analyzer it is somewhat hard to prove...

Here's a lspci for the box:

00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corporation 440BX/ZX - 82443BX/ZX AGP bridge (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
00:07.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01)
00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
00:09.0 Ethernet controller: Winbond Electronics Corp W89C940
00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
00:0b.1 Multimedia controller: Brooktree Corporation Bt878 (rev 02)
00:0d.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c875 (rev 26)
00:0f.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 06)
00:11.0 Ethernet controller: Winbond Electronics Corp W89C940 (rev 0b)
00:13.0 Unknown mass storage controller: Triones Technologies, Inc. HPT366 (rev 01)
00:13.1 Unknown mass storage controller: Triones Technologies, Inc. HPT366 (rev 01)
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 04)

and here's a cat /proc/<interesting_file>

/proc/cpuinfo shows this box contains dual Celeron 466's (non-overclocked)

0: 10003353 9483961 IO-APIC-edge timer
1: 85449 84279 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
3: 167 249 IO-APIC-edge serial
4: 380807 381140 IO-APIC-edge serial
14: 136991 132077 IO-APIC-edge ide0
15: 25836 24605 IO-APIC-edge ide1
16: 42510 42482 IO-APIC-level es1371, mga@PCI:1:0:0
17: 26 26 IO-APIC-level sym53c8xx
18: 9287 8837 IO-APIC-level bttv
19: 205294 205191 IO-APIC-level eth0, eth1, usb-uhci
NMI: 19487238 19487238
LOC: 19488621 19488620
ERR: 0

total: used: free: shared: buffers: cached:
Mem: 261984256 260354048 1630208 0 12873728 99012608
Swap: 511926272 14245888 497680384

# network cards share IRQ with USB, which hosts...
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 11/900 us ( 1%), #Int= 1, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI Root Hub
S: SerialNumber=c000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=03f0 ProdID=0401 Rev= 1.00
S: Product=HP ScanJet 5200C
S: SerialNumber=SG95D1720ZHT
C:* #Ifs= 1 Cfg#= 1 Atr=60 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=00(>ifc ) Sub=00 Prot=00 Driver=usbscanner
E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 16 Ivl= 0ms
E: Ad=83(I) Atr=03(Int.) MxPS= 1 Ivl=250ms

uname -a:
Linux behemoth.localnet 2.4.0 #1 SMP Fri Jan 5 15:41:39 CET 2001 i686 unknown


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