[Bug 27052] New: Module KVM : unable to handle kernel NULL pointer dereference at

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=27052

           Summary: Module KVM : unable to handle kernel NULL pointer
                    dereference at
           Product: Virtualization
           Version: unspecified
    Kernel Version: 2.6.37
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
        ReportedBy: prochazka.nicolas@gmail.com
        Regression: No


Hello, 
last git tree for qemu-kvm, kernel 2.6.37 , after some time guests ( Windows
XP) qemu-kvm vms causes this : 
( it seems to be specifiq on some server, here NecEXPRESS 5800 ) It is
difficult to me to reproduce this problem ( not access to this server ) . On
this server, bug is reproductible 100 % 


BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: [<ffffffffa001c38a>] gfn_to_rmap+0x2a/0x70 [kvm]
PGD 1ca9c3067 PUD 1ccba0067 PMD 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
CPU 3
Modules linked in: kvm_intel kvm

Pid: 17700, comm: qemu Not tainted 2.6.37 #3 MS-9192-01S/Express5800/120Rh-1
[N8100-xxxxF]
RIP: 0010:[<ffffffffa001c38a>]  [<ffffffffa001c38a>] gfn_to_rmap+0x2a/0x70
[kvm]
RSP: 0018:ffff8801caa179f8  EFLAGS: 00010246
RAX: 0000000000000000 RBX: fffffffffffff001 RCX: ffff8801ca14e948
RDX: 0000000000000000 RSI: fffffffffffff001 RDI: 00000000000fee01
RBP: ffff8801caa17a08 R08: ffff8801ca14e000 R09: 0000000000000022
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000009204ffc R14: ffff8801ca990000 R15: ffff8801caa17a84
FS:  00007f0c0ab6f710(0000) GS:ffff8800cfcc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 0000000000000000 CR3: 00000001cb8b7000 CR4: 00000000000026e0
DR0: 00000000000000a0 DR1: 0000000000000000 DR2: 0000000000000003
DR3: 00000000000000b0 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process qemu (pid: 17700, threadinfo ffff8801caa16000, task ffff8802463b4000)
Stack:
 ffff88019f29fff8 ffff8801ca954000 ffff8801caa17a28 ffffffffa001c44c
 0000000000000ff8 ffff880208c2d820 ffff8801caa17ab8 ffffffffa0021075
 0000000400000001 0000000000005f99 0000000000424f99 0000000000000001
Call Trace:
 [<ffffffffa001c44c>] drop_spte+0x7c/0x1f0 [kvm]
 [<ffffffffa0021075>] paging32_sync_page+0xe5/0x1c0 [kvm]
 [<ffffffffa001cd6a>] __kvm_sync_page+0x5a/0xb0 [kvm]
 [<ffffffffa001f6a9>] mmu_sync_children+0x249/0x350 [kvm]
 [<ffffffffa00217ca>] ? kvm_mmu_pte_write+0x29a/0xaa0 [kvm]
 [<ffffffffa00238aa>] ? seg_base+0x1a/0x30 [kvm]
 [<ffffffffa001d4b2>] ? mmu_free_roots+0xc2/0x180 [kvm]
 [<ffffffffa0020305>] ? kvm_mmu_get_page+0x4b5/0x710 [kvm]
 [<ffffffffa001f878>] mmu_sync_roots+0xc8/0x160 [kvm]
 [<ffffffffa00205e0>] kvm_mmu_load+0x80/0x420 [kvm]
 [<ffffffffa00177e5>] kvm_arch_vcpu_ioctl_run+0xc95/0xe20 [kvm]
 [<ffffffff81081800>] ? wake_futex+0x40/0x60
 [<ffffffffa0015fc0>] ? kvm_arch_vcpu_load+0x50/0x140 [kvm]
 [<ffffffffa0005811>] kvm_vcpu_ioctl+0x561/0x860 [kvm]
 [<ffffffff819aeeac>] ? schedule+0x31c/0x990
 [<ffffffff81131087>] do_vfs_ioctl+0xa7/0x560
 [<ffffffff81122b44>] ? fput+0x34/0x280
 [<ffffffff810840fe>] ? sys_futex+0xce/0x170
 [<ffffffff8113158f>] sys_ioctl+0x4f/0x80
 [<ffffffff81003042>] system_call_fastpath+0x16/0x1b
Code: 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 0f 1f 44 00 00 41
89 d4 48 89 f3 e8                                    af 3d fe ff 41 83 fc 01 48
89 c2 75 1a <48> 2b 18 48 8d 04 dd 00 00 00 00 48 03 42 18 48 8b 1c            
                       24 4c 8b
RIP  [<ffffffffa001c38a>] gfn_to_rmap+0x2a/0x70 [kvm]
 RSP <ffff8801caa179f8>
CR2: 0000000000000000
---[ end trace 02041dca60973834 ]---

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