On May 28, 2015 8:12 PM, "Stanislav German-Evtushenko" <ginermail@ <ginerm...@gmail.com>gmail.com <ginerm...@gmail.com>> wrote: > > > Your test code was a really interesting example, and lead to > > really unexpected results (at least for me). But as Eneko already > > mentioned, nobody would write such code. It is simply not thread save, > > and I think qemu does it correctly. > > I have written that code only because nobody wanted to test real-life > test cases I had provided (VM with low memory and Windows 7 inside). > However now I think it is going to be even easier to reproduce in a > VM. My guess if you install a VM with virtual drive on DRBD or MD RAID > and cache=none, create ext3 or ext4 partition inside this VM and run > my code inside then you will get inconsistence. May be you need to run > it not once but 10-20 times but finally it should happen. > > Stanislav
Also I want to mentioned that I started to write that C-code because of the following message in logs which clearly stated what happened: Jun 14 08:50:12 kvm5 kernel: block drbd0: Digest mismatch, buffer modified by upper layers during write: 21158352s +4096
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