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kern/47290: Boot hangs up (regression in 6.0.0_PATCH since 6.0_STABLE)

>Number:         47290
>Category:       kern
>Synopsis:       Boot hangs up (regression in 6.0.0_PATCH since 6.0_STABLE)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 06 23:20:06 +0000 2012
>Originator:     Aleksey Cheusov
>Release:        NetBSD 6.0.0_PATCH
System: NetBSD 6.0.0_PATCH NetBSD 6.0.0_PATCH 
(GENERIC) #2: Thu Dec 6 18:53:59 FET 2012
Architecture: i386
Machine: i386
After update from 6.0_STABLE to 6.0.0_PATCH
my system stops booting. The last message I see is the following

   acpi0 at mainbus0: Intel ACPICA 20110623

that is, it hangs up in early stage.
This is relatively modern machine with dual core AMD Athlon(tm) 64 X2 4600+

Reverting the following commit solves the problem

date: 2012/11/22 00:34:25;  author: riz;  state: Exp;  lines: +2 -4
Pull up following revision(s) (requested by chs in ticket #682):
        sys/dev/acpi/acpi_pci_link.c: revision 1.19
re-enable the code to disable link devices at startup, ie. revert rev 1.3.
this fixes PCI interrupts on some systems (eg. HP XW9400) and we suspect that
the problems which led to the original change were caused by buggy early
implementations of ACPI, which are now ignored by date.

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