Re: qc timeout ... failed to IDENTIFY - qemu/kvm setup

[Tejun Heo <tj@kernel.org>]

On 08/09/2010 07:55 PM, Tharindu Rukshan Bamunuarachchi wrote:
> hi All,
> 
> I am getting following message when I try to start my qemu/kvm virtual machine.
> I have been using qemu/kvm setup for last couple of months, issue was
> introduced after upgrading to v2.6.35-rc6.
> 
> VM starts as usual when I disable SMP. Issue is not visible in v2.6.34x.
> 
> [    6.052229] ata1.01: qc timeout (cmd 0xec)
> [    6.054105] ata1.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> [    6.056653] ata2.01: qc timeout (cmd 0xec)
> [    6.058453] ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> [   16.212186] ata1.01: qc timeout (cmd 0xec)
> [   16.214056] ata1.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> [   16.220146] ata2.01: qc timeout (cmd 0xec)
> [   16.221986] ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> [   46.376202] ata1.01: qc timeout (cmd 0xec)
> [   46.378164] ata1.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> [   46.384165] ata2.01: qc timeout (cmd 0xec)
> [   46.386140] ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
> 
> I think following CONFIGs are introduced with latest version ... could
> there be any relation to above error ..
> 
> CONFIG_IO_DELAY_TYPE_0X80=0
> CONFIG_IO_DELAY_TYPE_0XED=1
> CONFIG_IO_DELAY_TYPE_UDELAY=2
> CONFIG_IO_DELAY_TYPE_NONE=3
> CONFIG_IO_DELAY_0X80=y
> 
> 
> Please provide any clue or debug method to resolve the issue ?
> Could this be an issue with kvm/qemu ?
> 
> Sorry if i am addressing wrong mailing-list.

If the problem is qemu specific, it would probably be bettr to report
it to qemu mailing list.  Can you please post full kernel log just in
case?

Thanks.

-- 
tejun