Guest crashes with 068 user-space, works with 066

Guest crashes with 068 user-space, works with 066

[Damjan]

Strange situation, I have a Ubuntu JeOS image that crashes with this
error when started by the kvm-068 user-space. Bellow is the trace from 
the kernel...

The same image, works with:
- kvm-066 user space, kvm-068 kernel module (on 2.6.24 and 2.6.25)
- kvm-066 user space, vanilla kernel module (from 2.6.24 and 2.6.25)
(on my x60s laptop, 1GB ram, L2400 CoreDuo cpu, 
 ArchLinux gcc-4.3.0 and gcc-3.4.6 glibc 2.7, 32bit)

More strange, the same image works fine with both kvm-068 user space and 
kvm-068 kernel module on my Slackware-12.0 desktop 
(Q6600 cpu gcc-3.4.6 glibc-2.5 kernel-2.6.25, 32bit).

I was using "qemu-kvm jeos.img -nographic" to gather this:

[    6.117980] Compat vDSO mapped to ffffe000.
[    6.121733] Checking 'hlt' instruction... OK.
[    6.143312] SMP alternatives: switching to UP code
[    6.159486] Freeing SMP alternatives: 11k freed
[    6.161761] invalid opcode: 0000 [#1] SMP
[    6.164241] Modules linked in:
[    6.166390]
[    6.167671] Pid: 0, comm: swapper Not tainted (2.6.24-16-virtual #1)
[    6.170286] EIP: 0060:[<c01a1499>] EFLAGS: 00010282 CPU: 0
[    6.172744] EIP is at new_inode+0x9/0x90
[    6.174739] EAX: c03da9a4 EBX: c7000150 ECX: 00000000 EDX: 000041ed
[    6.177339] ESI: c7407200 EDI: 00000000 EBP: c7403800 ESP: c03ffe88
[    6.179940]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[    6.182334] Process swapper (pid: 0, ti=c03fe000 task=c03ce3a0 task.ti=c03fe000)
[    6.185246] Stack: c7000150 000041ed c01d51fb c7000150 c70012a8 000041ed c7403800 c01d538a
[    6.191415]        c7000150 c70012a8 c7000150 c01d5415 00000000 c0318de0 c0195679 000001ed
[    6.197349]        00000001 000001ed c7000150 c741e000 c70012a8 c03ffee8 c01977ff 000041ed
[    6.203202] Call Trace:
[    6.208235]  [<c01d51fb>] ramfs_get_inode+0x1b/0x120
[    6.213546]  [<c01d538a>] ramfs_mknod+0x1a/0x80
[    6.228274]  [<c01d5415>] ramfs_mkdir+0x15/0x30
[    6.233179]  [<c0195679>] vfs_mkdir+0xc9/0x150
[    6.237319]  [<c01977ff>] sys_mkdirat+0x9f/0xe0
[    6.241279]  [<c019785f>] sys_mkdir+0x1f/0x30
[    6.246523]  [<c0408fda>] do_name+0x1da/0x1e0
[    6.250381]  [<c0406c3c>] write_buffer+0x1c/0x30
[    6.254444]  [<c0406cde>] flush_window+0x7e/0xd0
[    6.258508]  [<c0408b64>] unpack_to_rootfs+0x714/0x950
[    6.262862]  [<c0408dba>] early_populate_rootfs+0x1a/0x60
[    6.267606]  [<c0403a3f>] start_kernel+0x2ff/0x3a0
[    6.271736]  [<c0403130>] unknown_bootoption+0x0/0x1e0
[    6.276209]  =======================
[    6.279345] Code: a9 3d c0 8d 44 24 08 e8 06 fc ff ff b8 bc a9 3d c0 e8 3c a7 16 00 8b 04 24 83 c4 10 5b 5e 5f 5d c3 90 56 89 c6 53 b8 a4 a9 3d c0 <0f> 0d 08 90 89 f0 e8 5c f3 ff ff 85 c0 89 c3 74 66 b8 a4 a9 3d
[    6.308342] EIP: [<c01a1499>] new_inode+0x9/0x90 SS:ESP 0068:c03ffe88
[    6.314456] ---[ end trace ca143223eefdc828 ]---
[    6.318332] Kernel panic - not syncing: Attempted to kill the idle task!


-- 
damjan | дамјан
This is my jabber ID -->         damjan@bagra.net.mk 
 -- not my mail address, it's a Jabber ID --^ :)

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Re: Guest crashes with 068 user-space, works with 066

[Avi Kivity]

Damjan wrote:
> Strange situation, I have a Ubuntu JeOS image that crashes with this
> error when started by the kvm-068 user-space. Bellow is the trace from 
> the kernel...
>
> The same image, works with:
> - kvm-066 user space, kvm-068 kernel module (on 2.6.24 and 2.6.25)
> - kvm-066 user space, vanilla kernel module (from 2.6.24 and 2.6.25)
> (on my x60s laptop, 1GB ram, L2400 CoreDuo cpu, 
>  ArchLinux gcc-4.3.0 and gcc-3.4.6 glibc 2.7, 32bit)
>
> More strange, the same image works fine with both kvm-068 user space and 
> kvm-068 kernel module on my Slackware-12.0 desktop 
> (Q6600 cpu gcc-3.4.6 glibc-2.5 kernel-2.6.25, 32bit).
>
> [    6.279345] Code: a9 3d c0 8d 44 24 08 e8 06 fc ff ff b8 bc a9 3d c0 e8 3c a7 16 00 8b 04 24 83 c4 10 5b 5e 5f 5d c3 90 56 89 c6 53 b8 a4 a9 3d c0 <0f> 0d 08 90 89 f0 e8 5c f3 ff ff 85 c0 89 c3 74 66 b8 a4 a9 3d
>   

   0:   0f 0d 08                prefetchw (%rax)


3Dnow! got accidentally exposed to the guest.  kvm-69 will disable it again.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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