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Re: [Xen-devel] Xen blktap driver for Ceph RBD : Anybody wants to test ? :p

Just noticed email subject "qemu-1.4.0 and onwards, linux kernel 3.2.x, 
ceph-RBD, heavy I/O leads to kernel_hung_tasks_timout_secs message and 
unresponsive qemu-process, [Qemu-devel] [Bug 1207686]" where Sage noted that he 
has seen a completion called twice in the logs the OP posted. If that is 
actually happening (and not just an artefact of logging ring buffer overflowing 
or something) then I think that could easily cause a segfault in tapdisk rbd.

I'll try and see if I can log when that happens.


> -----Original Message-----
> From: Sylvain Munaut [mailto:s.munaut@xxxxxxxxxxxxxxxxxxxx]
> Sent: Tuesday, 13 August 2013 7:20 PM
> To: James Harper
> Cc: Pasi Kärkkäinen; ceph-devel@xxxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Xen blktap driver for Ceph RBD : Anybody wants to
> test ? :p
> Hi,
> > I hope not. How could I tell? It's not something I've explicitly enabled.
> It's disabled by default.
> So you'd have to have enabled it either in ceph.conf  or directly in
> the device path in the xen config. (option is 'rbd cache',
> http://ceph.com/docs/next/rbd/rbd-config-ref/ )
> Cheers,
>     Sylvain

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