Bug 144809

This happend while portupgrading emulators/virtualbox-ose.

# kgdb -n 33
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Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0xbfcc1bd8
fault code		= supervisor read, page not present
instruction pointer	= 0x20:0xc07e363e
stack pointer	        = 0x28:0xc5b4ebb8
frame pointer	        = 0x28:0xc5b4ec04
code segment		= base rx0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 24017 (cc1)
trap number		= 12
panic: page fault
cpuid = 1
Uptime: 35m15s
Physical memory: 2027 MB
Dumping 214 MB: 199 183 167 151 135 119 103 87 71 55 39 23 7

Reading symbols from /boot/kernel/linux.ko...Reading symbols from /boot/kernel/linux.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/linux.ko
Reading symbols from /boot/modules/nvidia.ko...done.
Loaded symbols for /boot/modules/nvidia.ko
Reading symbols from /boot/kernel/acpi.ko...Reading symbols from /boot/kernel/acpi.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols from /boot/kernel/linprocfs.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/linprocfs.ko
Reading symbols from /boot/kernel/logo_saver.ko...Reading symbols from /boot/kernel/logo_saver.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/logo_saver.ko
#0  doadump () at pcpu.h:196
196		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0  doadump () at pcpu.h:196
#1  0xc059c907 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc059cbdc in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0xc07e996c in trap_fatal (frame=0xc5b4eb78, eva=3217824728) at /usr/src/sys/i386/i386/trap.c:950
#4  0xc07e9bd0 in trap_pfault (frame=0xc5b4eb78, usermode=0, eva=3217824728) at /usr/src/sys/i386/i386/trap.c:863
#5  0xc07ea5d9 in trap (frame=0xc5b4eb78) at /usr/src/sys/i386/i386/trap.c:541
#6  0xc07ce5eb in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7  0xc07e363e in pmap_remove_pages (pmap=0xc75b9178) at /usr/src/sys/i386/i386/pmap.c:3994
#8  0xc079a7bc in vmspace_exit (td=0xc60cb240) at /usr/src/sys/vm/vm_map.c:404
#9  0xc05745b8 in exit1 (td=0xc60cb240, rv=0) at /usr/src/sys/kern/kern_exit.c:306
#10 0xc057592d in sys_exit (td=Could not find the frame base for "sys_exit".
) at /usr/src/sys/kern/kern_exit.c:110
#11 0xc07e9f35 in syscall (frame=0xc5b4ed38) at /usr/src/sys/i386/i386/trap.c:1101
#12 0xc07ce650 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:262
#13 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) f 7
#7  0xc07e363e in pmap_remove_pages (pmap=0xc75b9178) at /usr/src/sys/i386/i386/pmap.c:3994
3994						pte = vtopte(pv->pv_va);
(kgdb) list
3989					inuse &= ~bitmask;
3990	
3991					pte = pmap_pde(pmap, pv->pv_va);
3992					tpte = *pte;
3993					if ((tpte & PG_PS) == 0) {
3994						pte = vtopte(pv->pv_va);
3995						tpte = *pte & ~PG_PTE_PAT;
3996					}
3997	
3998					if (tpte == 0) {
(kgdb) p/x *(pv)
$5 = {pv_va = 0x306f666e, pv_list = {tqe_next = 0x2e090a3a, tqe_prev = 0x74636573}}