[rhos-list] Nova-network v.s. Quantum in Openstack preview

Mon Feb 18 13:34:46 UTC 2013

Thanks for the information. There's no need to test exhaustively each
CPU flag, I just wanted to find a minimal test case where the bug could
be reproduced by simply enabling one feature bit.

Note that the bug may be completely unrelated to support of feature
flags on Nehalem or your host CPU. The problem is happening when KVM is
already running guest code, not during CPU feature check/initialization.

I don't know yet what can be causing the issue, but I don't discard the
possibility of a CPU defect. In either case, this bug is not
reproducible on any of the machines where we have run our tests, so we
need more details about your host CPU: the contents of /proc/cpuinfo and
(in case you can install x86info) the output of 'x86info -v -a'

Also, I still need to know the version of the kernel, seabios, vgabios,
and gpxe packages.

On Sat, Feb 16, 2013 at 06:55:56PM +0000, Shixiong Shang (shshang) wrote:
> Hi, Eduardo:
> 
> Thanks a lot for the comments! It is really helpful! Based on your
> suggestion, I did a quick verification on the cpu flags, and the
> result is very ugly…KVM crashes pretty much for most of the flags I
> tested:
> 
> No crash: fxsr Crash:  sse2, sse, mmx, clflush, pse36, pat, cmov, mca
> 
> The test was conducted by using
> qemu-kvm-rhev-0.12.1.2-2.351.el6.x86_64. I did yum update last night
> going to bed and the qemu-kvm-0.12.1.2-2.335.el6.x86_64 was obsoleted
> by qemu-kvm-rhev-0.12.1.2-2.351.el6.x86_64.
> 
> I didn't exhaust the list, but all of these flags should be supported
> by Nehalem. At this moment, do you think we may have CPU defect?
> Please see attached TXT file for details.
> 
> Thanks!
> 
> Shixiong
> 
> 
> 
> 
> 
> 
> 
> 
> On Feb 15, 2013, at 10:52 PM, Eduardo Habkost <ehabkost at redhat.com<mailto:ehabkost at redhat.com>>
>  wrote:
> 
> 
> Hi, all,
> 
> I'm Eduardo from the KVM team. Some comments and questions below:
> 
> 
> On Sat, Feb 16, 2013 at 02:31:24AM +0000, Shixiong Shang (shshang) wrote:
> Hi, Perry and Karen:
> 
> I did some further investigation tonight. The VM instance was
> initiated with lot of parameters, among which, here is one line
> related to CPU model:
> 
> -cpu Nehalem,+rdtscp,+vmx,+ht,+ss,+acpi,+ds,+vme -enable-kvm
> 
> 
> Based on qemu-kvm command and cpu_map.xml file, Nehalem and all of the
> flags are supported. However, when I tried to perform CPU check, KVM
> crashed again. The backtrace is identical to the ones I saw in failed
> VM instance log:
> 
> The "check" parameter asks QEMU to print warnings if some CPU features
> are not supported by the host CPU, but QEMU will start the guest
> normally after that. So, if you got to the "VNC server running" stage,
> it means all CPU features from the QEMU "Nehalem" CPU model should be
> supported by your host CPU + kernel, and the crash happened while the
> guest was already running, not during the CPU feature check.
> 
> 
> 
> [root at as-cmp1 libvirt]# /usr/libexec/qemu-kvm -cpu Nehalem,check
> 
> I am assuming you used just the above command with no extra parameters
> (meaning you don't even need a disk image to reproduce the bug), right?
> 
> 
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> 
> How long does the error message take to appear, after starting qemu-kvm?
> 
> extra data[0]: 80000003
> extra data[1]: 80000603
> 
> The data above is weird: the CPU is reporting that it was trying to
> deliver an int3 (but with the interrupt type bits set to "external
> interrupt", which doesn't make sense), and got another int3 interrupt
> generated when trying to deliver it.
> 
> It doesn't look right (the codes don't seem to make sense), and even if
> it was right, simply running qemu-kvm with no arguments shouldn't end up
> generating int3 interrupts at all.
> 
> I would test this in other machines, to make sure this is really not a
> hardware defect. Could you send the contents of /proc/cpuinfo? If you
> are able to install the x86info package, the output of 'x86info -v -a'
> would be useful, too.
> 
> 
> rax 00000000000003c3 rbx 00000000000008f2 rcx 000000000000013f rdx 000000000000ffdf
> rsi 0000000000000006 rdi 000000000000c993 rsp 00000000000003aa rbp 000000000000f000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 00000000000010e2 rflags 00000286
> 
> Interesting, RIP is different from your previous report. Does the value
> change if you run "/usr/libexec/qemu-kvm -cpu Nehalem,check" again?
> 
> 
> cs c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> FYI, I am using this qemu-kvm version:
> qemu-kvm-0.12.1.2-2.335.el6.x86_64
> 
> Thanks. What are the versions of the kernel, seabios, vgabios, and gpxe
> packages?
> 
> 
> 
> The potential workaround is to use generic CPU model, such as KVM64,
> with performance penalty. I will give it a try and keep you posted. In
> the meanwhile, if you can think of anything else, please let me at
> your early convenience.
> 
> If other CPU models work, it may simply indicate that some feature bit
> enabled by the Nehalem CPU model may be triggering the problem.
> 
> If that's the case, one way to find out which feature is causing the
> problem is to try:
> 
> $ /usr/lib/qemu-kvm -cpu qemu64,+sse2,+sse,+fxsr,+mmx,+clflush,+pse36,+pat,+cmov,+mca,+pge,+mtrr,+sep,+apic,+cx8,+mce,+pae,+msr,+tsc,+pse,+de,+fpu,+popcnt,+x2apic,+sse4.2,+sse4.1,+cx16,+ssse3,+sse3,+i64,+syscall,+xd,+lahf_lm,model=26
> 
> I expect the bug to be reproduced easily using the above command-line.
> After that, you can gradually remove features from the command-line,
> until we find which one is triggering the problem.
> 
> 
> 
> Thanks for your help!
> 
> Shixiong
> 
> 
> 
> --
> Eduardo
> 

> #
> # Full Feature List
> #
> 
> /usr/libexec/qemu-kvm -cpu qemu64,+sse2,+sse,+fxsr,+mmx,+clflush,+pse36,+pat,+cmov,+mca,+pge,+mtrr,+sep,+apic,+cx8,+mce,+pae,+msr,+tsc,+pse,+de,+fpu,+popcnt,+x2apic,+sse4.2,+sse4.1,+cx16,+ssse3,+sse3,+i64,+syscall,+xd,+lahf_lm,model=26
> VNC server running on `::1:5900'
> 
> KVM internal error. Suberror: 2
> extra data[0]: 80000006
> extra data[1]: 80000306
> rax 000000000000f043 rbx 000000000000049a rcx 0000000000000003 rdx 000000000000f000
> rsi 0000000000000003 rdi 000000000000c992 rsp 00000000000003ca rbp 000000000000f000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000001038 rflags 00010286
> cs c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> 
> 
> 
> 
> #
> # Bad - sse2
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+sse2
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000003
> extra data[1]: 80000603
> rax 000000000000ffc3 rbx 000000000000045e rcx 00000000000018ff rdx 000000000000f0ff
> rsi 0000000000000003 rdi 000000000000c993 rsp 000000000000038c rbp 000000000000f000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 00000000000010e2 rflags 00000286
> cs c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> #
> # Bad - sse
> #
> 
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+sse
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000006
> extra data[1]: 80000306
> rax 000000000000df7f rbx 0000000000000052 rcx 000000000000f4ff rdx 000000000000f07f
> rsi 0000000000000003 rdi 000000000000c992 rsp 00000000000003c8 rbp 000000000000f000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000001140 rflags 00010213
> cs c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr
> VNC server running on `::1:5900'
> 
> 
> 
> #
> # Bad - mmx
> #
> 
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+mmx,
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000003
> extra data[1]: 80000603
> rax 0000000000009f7f rbx 0000000000000042 rcx 000000000000f4ff rdx 000000000000f07f
> rsi 0000000000000003 rdi 000000000000c992 rsp 00000000000003c8 rbp 000000000000f000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000001138 rflags 00000213
> cs c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es c000 (000c0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> #
> # Bad clflush
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+clflush
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000003
> extra data[1]: 80000603
> rax 0000000000000023 rbx 00000000000000fd rcx 0000000000000000 rdx 00000000000003d1
> rsi 0000000000000003 rdi 000000000000c992 rsp 000000000000be76 rbp 0000000000000000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000006f05 rflags 00000016
> cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> 
> #
> # Bad pse36
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+pse36
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000006
> extra data[1]: 80000306
> rax 000000003c710000 rbx 0000000000000000 rcx 00000000f000be74 rdx 000000000cfe0000
> rsi 000000006ef00000 rdi 000000007e208000 rsp 0000000000006ea2 rbp 000000006f2f0000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000000040 rflags 00010446
> cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es 1800 (00018000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> #
> # Bad pat
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+pat
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000003
> extra data[1]: 80000603
> rax 0000000000000023 rbx 00000000000000fd rcx 0000000000000000 rdx 00000000000003d1
> rsi 0000000000000003 rdi 000000000000c992 rsp 000000000000be76 rbp 0000000000000000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000006f05 rflags 00000016
> cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
> 
> #
> # Bad cmov
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+cmov
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 1
> rax 000000003c71ffff rbx 00000000000000ef rcx 000000000000ffff rdx 000000000cfea962
> rsi 000000006ef07ae4 rdi 000000007e20fffc rsp 0000000000009101 rbp 000000006f2ffff0
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000004586 rflags 00010006
> cs f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss a961 (000a9610/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> emulation failure, check dmesg for details
> 
> 
> 
> #
> # Bad mca
> #
> [dmd at as-cmp1 ~]$ /usr/libexec/qemu-kvm -cpu qemu64,+fxsr,+mca
> VNC server running on `::1:5900'
> KVM internal error. Suberror: 2
> extra data[0]: 80000003
> extra data[1]: 80000603
> rax 0000000000000023 rbx 00000000000000fd rcx 0000000000000000 rdx 00000000000003d1
> rsi 0000000000000003 rdi 000000000000c992 rsp 000000000000be76 rbp 0000000000000000
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
> rip 0000000000006f05 rflags 00000016
> cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (feffd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt fc558/37
> idt 0/3ff
> cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> 
> 
> 
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> 

-- 
Eduardo