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

[Frank de Lange]

On Fri, Jan 12, 2001 at 10:40:04PM +1100, Andrew Morton wrote:
> Here is a debugging patch.  Could you please apply this,
> rebuild and:
> 
> 1: Type ALT-SYSRQ-A when everything is good
> 2: Type ALT-SYSRQ-A when everything is bad
> 3: send the resulting logs.

OK, here's the results I get...

Before network hang
===================

print_PIC()
printing PIC contents
print_IO_APIC()
testing the IO APIC.......................

.................................... done.
print_all_local_APICs()

... APIC ID:      01000000 (1)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000

... APIC ID:      00000000 (0)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000010000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000001000

NOTICE: results differ every time I hit ALT-SYSRQ-A.
	The '1' bit at 'row 11, col. 26' stays '1'
	no matter how many times I use the magic keys.
	The other '1' bits jump around a bit, or
	disappear alltogether. Also, the sequence
	in which the APICs appear in the dump sometimes
	differs (this example shows 1 first, then 0,
	other times you'd see 0 first, then 1)

After network hang
==================

print_PIC()
printing PIC contents
print_IO_APIC()
testing the IO APIC.......................

.................................... done.
print_all_local_APICs()

... APIC ID:      00000000 (0)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000010000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000

... APIC ID:      01000000 (1)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000

NOTICE:	hmmm... see, now that '1' bit at row 11,
	col. 26 for APIC 0 which was '1' before
	has turned to '0'. It will stay '0' no
	matter how many times I hit the magic keys...
	It seems to have been replaced by the '1'
	bit at row 11, col. 10, since that bit 
	stays '1' no matter how many magic I
	throw at it...

Hope this helps... If you need more, let me know...

Cheers//Frank
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