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

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





--- Comment #16 from prochazka <prochazka.nicolas@xxxxxxxxx>  2011-01-28 06:58:03 ---
Et voilà : 

Jan 28 01:28:18 bergson25412 rmap_remove:  ffff88011ce3fff8 1->BUG
Jan 28 01:28:18 bergson25412 ------------[ cut here ]------------
Jan 28 01:28:18 bergson25412 kernel BUG at arch/x86/kvm/mmu.c:701!
Jan 28 01:28:18 bergson25412 invalid opcode: 0000 [#1] SMP
Jan 28 01:28:18 bergson25412 last sysfs file:
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
Jan 28 01:28:18 bergson25412 CPU 3
Jan 28 01:28:18 bergson25412 Modules linked in: kvm_intel kvm
Jan 28 01:28:18 bergson25412
Jan 28 01:28:18 bergson25412 Pid: 14479, comm: qemu Not tainted 2.6.37 #3
MS-9192-01S/Express5800/120Rh-1 [N8100-xxxxF]
Jan 28 01:28:18 bergson25412 RIP: 0010:[<ffffffffa001c5a9>] 
[<ffffffffa001c5a9>] drop_spte+0x1d9/0x220 [kvm]
Jan 28 01:28:18 bergson25412 RSP: 0018:ffff880186bb7a08  EFLAGS: 00010292
Jan 28 01:28:18 bergson25412 RAX: 000000000000002c RBX: ffff88011ce3fff8 RCX:
000000000003ffff
Jan 28 01:28:18 bergson25412 RDX: ffffffff81d970c8 RSI: 0000000000000082 RDI:
0000000000000246
Jan 28 01:28:18 bergson25412 RBP: ffff880186bb7a28 R08: 000000000000e958 R09:
0000000000000000
Jan 28 01:28:18 bergson25412 R10: 0000000000000000 R11: 000000000000000f R12:
ffff8801c5b8bf00
Jan 28 01:28:18 bergson25412 R13: ffff880186d6c000 R14: 0000000000007a03 R15:
ffff880186bb7a84
Jan 28 01:28:18 bergson25412 FS:  00007f8e0fc6d710(0000)
GS:ffff8800cfcc0000(0000) knlGS:0000000000000000
Jan 28 01:28:18 bergson25412 CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
Jan 28 01:28:18 bergson25412 CR2: 00000000000c72ed CR3: 00000001aa8ff000 CR4:
00000000000026e0
Jan 28 01:28:18 bergson25412 DR0: 0000000000000045 DR1: 0000000000000000 DR2:
0000000000000000
Jan 28 01:28:18 bergson25412 DR3: 0000000000000005 DR6: 00000000ffff0ff0 DR7:
0000000000000400
Jan 28 01:28:18 bergson25412 Process qemu (pid: 14479, threadinfo
ffff880186bb6000, task ffff8801a85fc000)
Jan 28 01:28:18 bergson25412 Stack:
Jan 28 01:28:18 bergson25412 0000000000000ff8 ffff8801c5b8bf00 000000000c820ffc
ffff8801973cb490
Jan 28 01:28:18 bergson25412 ffff880186bb7ab8 ffffffffa00210a5 0000000000000001
000000000000c830
Jan 28 01:28:18 bergson25412 00000000003e6830 0000000000000001 0000000000000000
ffffea0000000001
Jan 28 01:28:18 bergson25412 Call Trace:
Jan 28 01:28:18 bergson25412 [<ffffffffa00210a5>] paging32_sync_page+0xe5/0x1c0
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa001cd9a>] __kvm_sync_page+0x5a/0xb0
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa001f6d9>] mmu_sync_children+0x249/0x350
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa002391a>] ? seg_base+0x1a/0x30 [kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa001d4e2>] ? mmu_free_roots+0xc2/0x180
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa0020335>] ?
kvm_mmu_get_page+0x4b5/0x710 [kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa001f8a8>] mmu_sync_roots+0xc8/0x160
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa0020610>] kvm_mmu_load+0x80/0x420 [kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa00177e5>]
kvm_arch_vcpu_ioctl_run+0xc95/0xe20 [kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa0015fc0>] ?
kvm_arch_vcpu_load+0x50/0x140 [kvm]
Jan 28 01:28:18 bergson25412 [<ffffffffa0005811>] kvm_vcpu_ioctl+0x561/0x860
[kvm]
Jan 28 01:28:18 bergson25412 [<ffffffff81131087>] do_vfs_ioctl+0xa7/0x560
Jan 28 01:28:18 bergson25412 [<ffffffff81122b39>] ? fput+0x29/0x280
Jan 28 01:28:18 bergson25412 [<ffffffff810840fe>] ? sys_futex+0xce/0x170
Jan 28 01:28:18 bergson25412 [<ffffffff8113158f>] sys_ioctl+0x4f/0x80
Jan 28 01:28:18 bergson25412 [<ffffffff81003042>]
system_call_fastpath+0x16/0x1b
Jan 28 01:28:18 bergson25412 Code: 48 89 10 eb c4 48 89 de 48 c7 c7 08 93 03 a0
31 c0 e8 2f 20 99 e1 0f 0b eb fe 48 89 de 48 c
7 c7 de ab 03 a0 31 c0 e8 1a 20 99 e1 <0f> 0b eb fe 41 0f b6 4c 24 28 4c 89 f6
83 e1 0f 48 89 da 48 c7
Jan 28 01:28:18 bergson25412 RIP  [<ffffffffa001c5a9>] drop_spte+0x1d9/0x220
[kvm]
Jan 28 01:28:18 bergson25412 RSP <ffff880186bb7a08>
Jan 28 01:28:18 bergson25412 ---[ end trace ca5feff4c31aee0f ]---


Regards, 
Nicolas

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