Re: [Xen-devel] Xen 4.0.4, kernel 3.5.0 HVM crash and kernel BUG

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Sep 30, 2012 at 11:18:03PM +0300, Valtteri Kiviniemi wrote:
>    Hi,
> 

Hello,

>    I'm trying to get Windows Server 2008 R2 installation booting on Xen
>    4.0.4. Using the following config:
>

<snip>
 
> 
>    The domU will start booting just fine, but after a few minutes the VNC
>    screen goes black. After that when typing "xm destroy ts" it will trigger
>    a kernel BUG:
> 
>    BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
>    IP: [<ffffffff810c50c4>] iput+0x3e/0x195
>    PGD 0
>    Oops: 0000 [#1] SMP
>    CPU 6
>    Pid: 3571, comm: qemu-dm Not tainted 3.5.0-dom0 #1

First of all upgrade to latest 3.5.x Linux kernel release .. so at least 3.5.4. 

-- Pasi


>    /DQ77MK
>    RIP: e030:[<ffffffff810c50c4>]  [<ffffffff810c50c4>] iput+0x3e/0x195
>    RSP: e02b:ffff8800389ffbf8  EFLAGS: 00010246
>    RAX: 0000000000000001 RBX: ffff8800377b0720 RCX: ffff8800501c0000
>    RDX: ffff8800501c0000 RSI: ffff8800377b0790 RDI: ffff8800377b0790
>    RBP: 0000000000000000 R08: ffffffff815cdd00 R09: 0000000000000016
>    R10: fefefefefefefeff R11: ffff8800377b0400 R12: 00000001000a3e0c
>    R13: 0000000000000000 R14: 00000001000a3e0c R15: ffff8800389ffc28
>    FS:  00007f1af70a8700(0000) GS:ffff880050180000(0000)
>    knlGS:0000000000000000
>    CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
>    CR2: 0000000000000030 CR3: 000000000156d000 CR4: 0000000000002660
>    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>    Process qemu-dm (pid: 3571, threadinfo ffff8800389fe000, task
>    ffff88003a721260)
>    Stack:
>     ffff88003a6d6400 ffff8800377b0000 00000001000a3e0c ffffffff8133ce8f
>     ffff8800377b0400 ffffffff8134b6cd ffff8800389ffc28 ffff8800389ffc28
>     ffff8800377b00f8 ffff8800377b0680 ffff880038cdcd60 ffff8800377b0000
>    Call Trace:
>     [<ffffffff8133ce8f>] ? sk_release_kernel+0x23/0x39
>     [<ffffffff8134b6cd>] ? netdev_run_todo+0x1e9/0x206
>     [<ffffffff8129798f>] ? tun_chr_close+0x4c/0x7b
>     [<ffffffff810b39d3>] ? fput+0xe4/0x1c5
>     [<ffffffff810b202c>] ? filp_close+0x61/0x68
>     [<ffffffff81035e62>] ? put_files_struct+0x62/0xb9
>     [<ffffffff81036374>] ? do_exit+0x24a/0x74c
>     [<ffffffff81036906>] ? do_group_exit+0x6b/0x9d
>     [<ffffffff8103ea0b>] ? get_signal_to_deliver+0x449/0x46e
>     [<ffffffff81009fa5>] ? do_signal+0x28/0x4c4
>     [<ffffffff81027079>] ? pvclock_clocksource_read+0x48/0xbf
>     [<ffffffff8105b745>] ? ktime_get_ts+0x66/0xa8
>     [<ffffffff810bfb18>] ? poll_select_copy_remaining+0xe0/0xf5
>     [<ffffffff8100a48d>] ? do_notify_resume+0x3b/0x74
>     [<ffffffff81411a70>] ? int_signal+0x12/0x17
>    Code: 00 00 00 40 74 02 0f 0b 48 8d 77 70 48 8d bf 08 01 00 00 e8 8b 71 10
>    00 85 c0 0f 84 5d 01 00 00 48 8b 6b 18 f6 83 80 00 00 00 08 <4c> 8b 65 30
>    74 11 be 68 05 00 00 48 c7 c7 8e df 4f 81 e8 bb d0
>    RIP  [<ffffffff810c50c4>] iput+0x3e/0x195
>     RSP <ffff8800389ffbf8>
>    CR2: 0000000000000030
>    ---[ end trace 67cc1654658fedcc ]---
>    Fixing recursive fault but reboot is needed!
> 
>    I also tested Xen 4.2.0 and problem is the same. So is this a Xen bug or a
>    kernel bug? I am running vanilla [1]kernel.org kernel 3.5.0 and my
>    hardware is Intel Core i7-3770 CPU and Intel DQ77MK motherboard with
>    latest bios.
> 
>    Best regards,
>    Valtteri Kiviniemi
> 
> References
> 
>    Visible links
>    1. http://kernel.org/

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