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Re: [Qemu-devel] Fwd: qemu drive mirror assert fault
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] Fwd: qemu drive mirror assert fault |
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Date: |
Thu, 30 Apr 2015 17:54:09 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 30/04/2015 17:50, Paolo Bonzini wrote:
> John, Fam,
>
> I got this report offlist. This happens if a bit in the hbitmap is
> cleared and the HBitmap has _not_ yet reached the bit. See this comment
> in include/qemu/hbitmap.h:
>
> * Resetting bits before the current
> * position of the iterator is also okay. However, concurrent
> * resetting of bits can lead to unexpected behavior if the iterator
> * has not yet reached those bits.
>
> Can you please take a look?
Oh, it's related to discard. The reported pointed out later that he is
using virtio-scsi and has discard=unmap enabled.
Paolo