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Date:   Thu, 13 Apr 2017 12:01:35 +0200
From:   Johannes Thumshirn <>
To:     Christoph Hellwig <>
Cc:     Jens Axboe <>, Omar Sandoval <>,
        Ming Lei <>,
        Bart Van Assche <>,
        Hannes Reinecke <>,
        Linux Block Layer Mailinglist <>,
        Linux Kernel Mailinglist <>
Subject: Re: [PATCH] block: bios with an offset are always gappy

On Thu, Apr 13, 2017 at 11:48:35AM +0200, Christoph Hellwig wrote:
> On Thu, Apr 13, 2017 at 10:06:29AM +0200, Johannes Thumshirn wrote:
> > Doing a mkfs.btrfs on a (qemu emulated) PCIe NVMe causes a kernel panic
> > in nvme_setup_prps() because the dma_len will drop below zero but the
> > length not.
> I think we should also turns this into a WARN_ON_ONCE + error return..
> But do you have an exact btrfsprogs version and command line?  I do a lot
> of testing that involves mkfs.btrfs on nvme and haven't seen it..

Ah one detail I forgot: mkfs.xfs _does_ work. Haven't checked ext4 though.

Johannes Thumshirn                                          Storage                                +49 911 74053 689
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