Re: [Qemu-devel] "iothread: release iothread around aio_poll" causes random hangs at startup

[Paolo Bonzini]

On 02/06/2015 16:36, Christian Borntraeger wrote:
> commit a0710f7995f914e3044e5899bd8ff6c43c62f916
> Author:     Paolo Bonzini <address@hidden>
> AuthorDate: Fri Feb 20 17:26:52 2015 +0100
> Commit:     Kevin Wolf <address@hidden>
> CommitDate: Tue Apr 28 15:36:08 2015 +0200
> 
>     iothread: release iothread around aio_poll
> 
> to cause a problem with hanging guests.
> 
> Having many guests all with a kernel/ramdisk (via -kernel) and
> several null block devices will result in hangs. All hanging 
> guests are in partition detection code waiting for an I/O to return
> so very early maybe even the first I/O.
> 
> Reverting that commit "fixes" the hangs.
> Any ideas?

Stefan, please revert it as I will not have time to look at it until
well into 2.4 soft freeze.

Paolo