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leaf9 login: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
*pde = 1f35d001
*pte = 00000000
Oops: 0000 [#1]
SMP DEBUG_PAGEALLOC
Modules linked in: kvm_intel kvm nfsd exportfs sctp ipv6 nfs lockd nfs_acl sunrpc bridge dm_snapshot parport_pc lp parport pcspkr ext3 jbd sg sd_mod mptsas mptscsih mptbase scsi_transport_sas scsi_mod ehci_hcd bnx2 uhci_hcd dm_mod
CPU:    0
EIP:    0060:[<c04168fe>]    Not tainted VLI
EFLAGS: 00010202   (2.6.20 #2)
EIP is at kmap_atomic+0x17/0xd1
eax: df358000   ebx: 00000e00   ecx: 00000000   edx: 00000007
esi: 00000007   edi: 00000303   ebp: df358c68   esp: df358c50
ds: 007b   es: 007b   ss: 0068
Process qemu (pid: 3063, ti=df358000 task=deaf5aa0 task.ti=df358000)
Stack: 000ffc08 00000303 df358c68 00000e00 ffc08e00 00000303 df358c88 f916da18 
       dec51098 f917f572 ffc01495 dec51098 ffc08e00 00000303 df358c9c f916dad8 
       dec51098 dec51098 00000303 df358cd0 f917f28b dec51098 00000000 ffffffff 
Call Trace:
 [<c0403cbe>] show_trace_log_lvl+0x1a/0x2f
 [<c0403d6e>] show_stack_log_lvl+0x9b/0xa3
 [<c0403f0b>] show_registers+0x195/0x26b
 [<c0404106>] die+0x125/0x224
 [<c0602dab>] do_page_fault+0x52d/0x603
 [<c060153c>] error_code+0x7c/0x84
 [<f916da18>] load_pdptrs+0x34/0xba [kvm]
 [<f916dad8>] set_cr3+0x3a/0x8b [kvm]
 [<f917f28b>] handle_cr+0xe6/0x213 [kvm_intel]
 [<f917ed2b>] kvm_vmx_return+0xe0/0x1dc [kvm_intel]
 [<f916f7b9>] kvm_vcpu_ioctl+0x2aa/0xcb0 [kvm]
 [<c046a6b2>] do_ioctl+0x22/0x67
 [<c046a949>] vfs_ioctl+0x252/0x265
 [<c046a9a5>] sys_ioctl+0x49/0x64
 [<c0402d50>] sysenter_past_esp+0x5d/0x81
 =======================
Code: 00 81 c2 00 25 00 00 39 d0 75 07 89 c8 e8 17 82 03 00 5d c3 55 89 c1 89 e5 57 56 89 d6 53 83 ec 0c 89 e0 25 00 f0 ff ff ff 40 14 <8b> 01 c1 e8 1e 69 c0 80 12 00 00 05 00 ba 69 c0 8b 90 0c 12 00 
EIP: [<c04168fe>] kmap_atomic+0x17/0xd1 SS:ESP 0068:df358c50
 <6>note: qemu[3063] exited with preempt_count 1
BUG: scheduling while atomic: qemu/0x10000001/3063
 [<c0403cbe>] show_trace_log_lvl+0x1a/0x2f
 [<c0404246>] show_trace+0x12/0x14
 [<c04042c1>] dump_stack+0x16/0x18
 [<c05ff4ee>] __sched_text_start+0x56/0x9f0
 [<c04195a9>] __cond_resched+0x16/0x34
 [<c05ffeae>] cond_resched+0x26/0x31
 [<c045cf78>] kmem_cache_zalloc+0x14/0x71
 [<c0444e61>] taskstats_exit+0x56/0x2a6
 [<c042091e>] do_exit+0x1ca/0x6e4
 [<c04041df>] die+0x1fe/0x224
 [<c0602dab>] do_page_fault+0x52d/0x603
 [<c060153c>] error_code+0x7c/0x84
 [<f916da18>] load_pdptrs+0x34/0xba [kvm]
 [<f916dad8>] set_cr3+0x3a/0x8b [kvm]
 [<f917f28b>] handle_cr+0xe6/0x213 [kvm_intel]
 [<f917ed2b>] kvm_vmx_return+0xe0/0x1dc [kvm_intel]
 [<f916f7b9>] kvm_vcpu_ioctl+0x2aa/0xcb0 [kvm]
 [<c046a6b2>] do_ioctl+0x22/0x67
 [<c046a949>] vfs_ioctl+0x252/0x265
 [<c046a9a5>] sys_ioctl+0x49/0x64
 [<c0402d50>] sysenter_past_esp+0x5d/0x81
 =======================