page fault in pmap_remove_all

Hi,

This is i386 -current as of 2010-08-04.
It was building the toolchain for amd64 when it happened.
I'll keep the vmcore around, so I can dig more into it
if someone tells me what to do.

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Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x0
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc083bc86
stack pointer           = 0x28:0xe50a1a94
frame pointer           = 0x28:0xe50a1ac4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 5785 (install)
trap number             = 12
panic: page fault
Uptime: 6h13m9s
Physical memory: 951 MB
Dumping 182 MB: 167 151 135 119 103 87 71 55 39 23 7

#0  doadump () at pcpu.h:231
231             __asm("movl %%fs:0,%0" : "=r" (td));
(kgdb) list *0xc083bc86
0xc083bc86 is in pmap_remove_all (atomic.h:318).
313     atomic_readandclear_int(volatile u_int *addr)
314     {
315             u_int res;
316
317             res = 0;
318             __asm __volatile(
319             "       xchgl   %1,%0 ;         "
320             "# atomic_readandclear_int"
321             : "+r" (res),                   /* 0 */
322               "=m" (*addr)                  /* 1 */
(kgdb) backtrace
#0  doadump () at pcpu.h:231
#1  0xc05daef0 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:416
#2  0xc05db11d in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:590
#3  0xc0840583 in trap_fatal (frame=0xe50a1a54, eva=0)
    at /usr/src/sys/i386/i386/trap.c:945
#4  0xc08407d0 in trap_pfault (frame=0xe50a1a54, usermode=0, eva=0)
    at /usr/src/sys/i386/i386/trap.c:858
#5  0xc0840cf3 in trap (frame=0xe50a1a54) at /usr/src/sys/i386/i386/trap.c:533
#6  0xc082ce2c in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7  0xc083bc86 in pmap_remove_all (m=0xc150e9e8) at atomic.h:318
#8  0xc07e9544 in vm_fault (map=0xc38463c0, vaddr=684290048,
    fault_type=1 '\001', fault_flags=Variable "fault_flags" is not available.
) at /usr/src/sys/vm/vm_fault.c:499
#9  0xc08406c0 in trap_pfault (frame=0xe50a1d28, usermode=1, eva=684290048)
    at /usr/src/sys/i386/i386/trap.c:837
#10 0xc0840b5e in trap (frame=0xe50a1d28) at /usr/src/sys/i386/i386/trap.c:399
#11 0xc082ce2c in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#12 0x0804858c in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) 



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