NetBSD Problem Report #38597

From rafal@pobox.com  Tue May  6 15:59:16 2008
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Date: Tue, 06 May 2008 11:49:27 -0400 (EDT)
From: rafal@netbsd.org
Reply-To: rafal@netbsd.org
To: gnats-bugs@gnats.NetBSD.org
Subject: 4.99.62 hpcarm kernel dies with NULL pmap in pmap_fault_fixup
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>Number:         38597
>Category:       port-hpcarm
>Synopsis:       4.99.62 hpcarm kernel dies with NULL pmap in pmap_fault_fixup
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-hpcarm-maintainer
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 06 16:00:00 +0000 2008
>Closed-Date:    Wed Jun 11 18:53:08 +0000 2008
>Last-Modified:  Wed Jun 11 18:53:08 +0000 2008
>Originator:     rafal@netbsd.org
>Release:        NetBSD 4.99.62
>Organization:
TNF
>Environment:
System: NetBSD j720 4.99.62 NetBSD 4.99.62 (J720) #8: Tue May  6 09:04:45 EDT 2008 rafal@fearless-vampire-killer.waterside.net:/extra/netbsd-src/hpcarm-bughunt.head/src/sys/arch/hpcarm/compile/J720
Architecture: arm
Machine: hpcarm
>Description:
	LOCKDEBUG / DIAGNOSTIC Kernel dies early in the boot process (while
	doing uvm_init()) with a 'lockdebug_lookup: uninitialized lock' panic.
	Passing the return address through to more of the lockdebug functions
	gets me a return address in what looks like pmap_fault_fixup(); from
	the panic, it appears that the pmap pointer is NULL.

	Boot log with some extra debug goo below:

	[...hpcboot stuff snipped...]
	kernsize=0x3b125c
	Allocating page tables
	IRQ stack: p0xc0010000 v0xc0010000
	ABT stack: p0xc0011000 v0xc0011000
	UND stack: p0xc0012000 v0xc0012000
	SVC stack: p0xc0013000 v0xc0013000
	Creating L1 page table
	Mapping kernel
	pmap_map_chunk: pa=0xc0040000 va=0xc0040000 size=0x44c000 resid=0x44c000 prot=0x3 cache=1
	LLLLLLLLLLLLSSSLLLLLLLLPPPPPPPPPPPP
	Constructing L2 page tables
	pmap_map_chunk: pa=0xc0010000 va=0xc0010000 size=0x1000 resid=0x1000 prot=0x3 cache=1
	P
	pmap_map_chunk: pa=0xc0011000 va=0xc0011000 size=0x1000 resid=0x1000 prot=0x3 cache=1
	P
	pmap_map_chunk: pa=0xc0012000 va=0xc0012000 size=0x1000 resid=0x1000 prot=0x3 cache=1
	P
	pmap_map_chunk: pa=0xc0013000 va=0xc0013000 size=0x2000 resid=0x2000 prot=0x3 cache=1
	PP
	pmap_map_chunk: pa=0xc0000000 va=0xc0000000 size=0x4000 resid=0x4000 prot=0x3 cache=2
	PPPP
	pmap_map_chunk: pa=0xc0000000 va=0xc0000000 size=0x10000 resid=0x10000 prot=0x3 cache=2
	L
	devmap: 80050000 -> 80050023 @ d000d000
	pmap_map_chunk: pa=0x80050000 va=0xd000d000 size=0x24 resid=0x1000 prot=0x3 cache=0
	P
	pmap_map_chunk: pa=0xe0000000 va=0xc0018000 size=0x8000 resid=0x8000 prot=0x3 cache=1
	PPPPPPPP
	done.
	init subsystems: stacks vectors c02aa1ac c02aa7bc c02a9db0
	undefined freemempos=c0021000
	MMU enabled. control=c000107d
	kernsize=0x44c000 (including 0x96913 symbols)
	about to init kernel lock
	about to init UVM
	uvm_amap_init()
	uvm_page_init()
	uvm_map_init()
	uvm_km_init()
	uao_init()
	panic: lockdebug_lookup: uninitialized lock (lock=0x14, from=c02ae0e0)
	Begin traceback...
	0xc0014bc8
		scp=0xc0014bc8 rlv=0xc0014b94 (0xc0014b94)
		rsp=0xc0014b9c rfp=0xc022a2d0
	0xe1a0c00d
		scp=0xe1a0c00d rlv=0xc0345b68 (netbsd:__kernassert+0x39e1c)
		rsp=0xc03c0260 rfp=0xc0382898
	*HANG*

>How-To-Repeat:
	Boot -current LOCKDEBUG/DIAGNOSTIC kernel on hpcarm.

>Fix:
	??

>Release-Note:

>Audit-Trail:

State-Changed-From-To: open->closed
State-Changed-By: rafal@NetBSD.org
State-Changed-When: Wed, 11 Jun 2008 18:53:08 +0000
State-Changed-Why:
This was either a UBD or a transient bug.. recent kernels don't have this
problem.
.


>Unformatted:
 		Sources from 5/5/08, ~ 1400 EDT.

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