DragonFly bugs List (threaded) for 2005-06
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Re: page fault on 1.2.0-RELEASE
On Mon, Jun 13, 2005 at 03:10:52PM -0700, Matthew Dillon wrote:
. ..
> A little broken... vm_paddr_t is a 64 bit quantity, you have to use
> %lld or %qd in your printfs . That's why page_range and npages
> are broken.
I had the vm_paddr_t's as %#llx but changed them to %lld. when I tried
to change npages to %lld, gcc complained. npages is a vm_size_t which
I think is a unsigned int for x86. In any case, here is the printf
printf("vm_page_startup:"
"\n\tfirst_page %#lx\n\tpage_range %lld\n\tnpages %d"
"\n\tend %lld\n\tnew_end %lld"
"\n\tvm_page_array %p\n\tmapped %#x\n",
first_page, page_range, npages, end, new_end, vm_page_array, mapped);
and the output
vm_page_startup:
first_page 0x1
page_range 11
npages -2046298669
end -27020983583899648
new_end -27020983583903744
vm_page_array 0xc081a000
mapped 0xc081b000
vm_page_startup 2:
phys_avail[i] 4096
phys_avail[i+1] 651264
last_pa 651264
After the first call to vm_add_new_page, I see the panic below which I
annotated
vm_add_new_page:
m 0xc081a000
m->queue 52410
vpq 0xc052ff88
flipflop 189185
vpq->pl 0xc052ff88
Fatal trap 12: page fault while in kernel mode
mp_lock = 00000000; cpuid = 0; lapic.id = 00000000
fault virtual address = 0x2b633
fault code = supervisor write, page not present
instruction pointer = 0x8:0xc02f2753
stack pointer = 0x10:0xc0599ce8
frame pointer = 0x10:0xc0599d0c
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 = 0 (thread0)
current thread = pri 44 (CRIT)
interrupt mask = net tty bio cam <- SMP: XXX
kernel: type 12 trap, code=2
CPU0 stopping CPUs: 0x00000000
stopped
Stopped at 0xc02f2753: movl %edi,0(%eax)
db> trace
(null)(1000,0,c042ee00,c03f929c,5a4000) at 0xc02f2753 vm_add_new_page
(null)(5a4000,3fbf8000,c081a000,c0599d98,c01e3f18) at 0xc02f2b77 vm_page_startup
(null)(0,596c00,5a4000,0,c01398cc) at 0xc02ea62f vm_mem_init
(null)(596000,0,0,0,0) at 0xc01e3f18 mi_startup
(null)() at 0xc01398cc begin
--
Chuck Tuffli
Agilent Technologies
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