Panic in recent 7.2-Stable

[Kostik Belousov]

On Sun, Sep 06, 2009 at 11:02:39AM +0200, Thierry Herbelot wrote:
> Hello,
> 
> I'm having a panic with the latest kernel build of my -Stable file server 
> (sources cvsupped around yesterday evening, CEST). The panic happens soon 
> after entering multi-user :
> 
> panic: vm_phys_paddr_to_vm_page: paddr 0xf0000 is not in any segment
> KDB: enter: panic
> [thread pid 1005 tid 100154 ]
> Stopped at      kdb_enter_why+0x3a:     movl    $0,kdb_why
> db> where
> Tracing pid 1005 tid 100154 td 0x8ecad480
> kdb_enter_why(80ba731f,80ba731f,80bc1ad6,fb301a94,fb301a94,...) at 
> kdb_enter_why+0x3a
> panic(80bc1ad6,f0000,0,8ecad480,0,...) at panic+0xd1
> vm_phys_paddr_to_vm_page(f0000,f0000,fb301ad8,1,80a36a78,...) at 
> vm_phys_paddr_to_vm_page+0x4d
> dev_pager_getpages(92b8d980,fb301c04,1,0,fb301bcc,...) at 
> dev_pager_getpages+0xe1
> vm_fault(89267bfc,33d90000,1,0,89b0b50c,...) at vm_fault+0x1020
> trap_pfault(202,7,8583b900,80cd9800,89b0eb00,...) at trap_pfault+0x15b
> trap(fb301d38) at trap+0x247
> 
> An excerpt of the dmesg is :
> 
> Copyright (c) 1992-2009 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>         The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 7.2-STABLE #35: Sun Sep  6 10:04:40 CEST 2009
>     XXX at YYY:/usr/obj/usr/src/sys/GENERIC
> Preloaded elf kernel "/boot/kernel/kernel" at 0x8101a000.
> Preloaded elf module "/boot/kernel/zfs.ko" at 0x8101a188.
> Preloaded elf module "/boot/kernel/opensolaris.ko" at 0x8101a230.
> Preloaded elf module "/boot/kernel/snd_cmi.ko" at 0x8101a2e0.
> Preloaded elf module "/boot/kernel/sound.ko" at 0x8101a38c.
> Preloaded /boot/zfs/zpool.cache "/boot/zfs/zpool.cache" at 0x8101a438.
> Preloaded elf module "/boot/kernel/acpi.ko" at 0x8101a490.
> 
> The previous kernel is older (around 22 august) and works as expected.
> 
> Some idents for the panic kernel are : (ie after SVN rev 196838)
> $FreeBSD: src/sys/i386/i386/pmap.c,v 1.594.2.20 2009/09/04 19:59:32 jhb Exp $
> $FreeBSD: src/sys/kern/kern_mbuf.c,v 1.32.2.6 2009/09/04 19:59:32 jhb Exp $
> $FreeBSD: src/sys/vm/device_pager.c,v 1.84.2.3 2009/09/04 19:59:32 jhb Exp $
> $FreeBSD: src/sys/vm/vm_object.c,v 1.385.2.7 2009/09/04 19:59:32 jhb Exp $
> $FreeBSD: src/sys/vm/vm_page.c,v 1.357.2.10 2009/09/04 19:59:32 jhb Exp $
> $FreeBSD: src/sys/vm/vm_phys.c,v 1.4.2.2 2009/09/04 19:59:32 jhb Exp $

I expect that the following patch, that is the partial merge of r194459,
would fix it. It patches sys/vm/vm_phys.c.

Index: vm_phys.c
===================================================================
--- vm_phys.c	(revision 194458)
+++ vm_phys.c	(revision 194459)
@@ -382,8 +382,7 @@
 		if (pa >= seg->start && pa < seg->end)
 			return (&seg->first_page[atop(pa - seg->start)]);
 	}
-	panic("vm_phys_paddr_to_vm_page: paddr %#jx is not in any segment",
-	    (uintmax_t)pa);
+	return (NULL);
 }
 
 /*
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