<div dir="ltr"><div>Hi All, </div><div><br></div><div>I am unable to figure out the issue here, when I try to create a filesystem (ext4) on a virtual disk using qemu-nbd. This happens intermittently. </div><div><br></div><div>Following is the sequence of commands:- </div><div><br></div><div>





<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">$> qemu-img create -f qcow2 test.qcow2 30G</span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><br></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span style="font-variant-ligatures:no-common-ligatures">$> qemu-nbd --connect=/dev/nbd0 test.qcow2</span><br></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span style="font-variant-ligatures:no-common-ligatures"><br></span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(180,36,25)"><span style="font-variant-ligatures:no-common-ligatures">$> </span><span style="color:rgb(0,0,0)"><b>mkfs.ext4 /dev/nbd0</b></span></p><div class="gmail-" style="color:rgb(0,0,0);margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-" style="font-variant-ligatures:no-common-ligatures"><b><span class="gmail-Apple-converted-space"> </span>mkfs.ext4:<span class="gmail-"><span class="gmail-Apple-converted-space"> </span>Device size reported to be zero.  Invalid partition specified, or</span></b></span></div><div class="gmail-" style="color:rgb(0,0,0);margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-" style="font-variant-ligatures:no-common-ligatures"><b class="gmail-">Thu Jun 13 14:44:24 2019 partition table wasn't reread after running fdisk, due to</b></span></div><div class="gmail-" style="color:rgb(0,0,0);margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-" style="font-variant-ligatures:no-common-ligatures"><b class="gmail-">Thu Jun 13 14:44:24 2019 a modified partition being busy and in use.  You may need to reboot</b></span></div><div class="gmail-" style="color:rgb(0,0,0);margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-" style="font-variant-ligatures:no-common-ligatures"><b class="gmail-">Thu Jun 13 14:44:24 2019 to re-read your partition table.</b></span></div></div><div><br></div><div><br></div><div>Following is the version details:</div><div><br></div><div>





<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">root@localhost:~# qemu-img --version</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">qemu-img version 2.8.1(Debian 1:2.8+dfsg-6+deb9u7)</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers</span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><br></span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">root@localhost:~# qemu-nbd --version</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">qemu-nbd version 0.0.1</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Written by Anthony Liguori.</span></p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0);min-height:13px"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"></span><br></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Copyright (C) 2006 Anthony Liguori <<a href="mailto:anthony@codemonkey.ws">anthony@codemonkey.ws</a>>.</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">This is free software; see the source for copying conditions.<span class="gmail-Apple-converted-space">  </span>There is NO</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.</span></p><p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><br></span></p></div><div>





<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">root@localhost:~# uname -a</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Linux localhost 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u2 (2019-05-13) x86_64 GNU/Linux</span></p></div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Regards<br>Tanmoy Sinha<br></div></div></div></div></div>