<div dir="ltr"><div>Hello,</div><div><br></div>We have a CoreOS VM(46 vCPU, 60GB RAM) freeze issue and hoping to find out what is going on in it at the time of freeze. When the VM froze, we have no access to it via ssh and ping works sometimes but not always. So, we suspended the VM which created vmem and vmss files.<div><br></div><div>Since this is a CoreOS VM, I have used toolbox to install and run crash.</div><div>When trying to read these files using crash utility, I'm getting the below message:</div><div><br></div><div>




<span></span>





<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><read_vmware_vmss: addr: ffffffff81c00100 paddr: 1c00100 cnt: 8></span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><readmem: ffffffff81c00100, KVADDR, "read_string characters", 1499, (ROE|Q), 7ffcf595cd70></span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><read_vmware_vmss: addr: ffffffff81c00100 paddr: 1c00100 cnt: 1499></span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">linux_banner:</span></p>
<p dir="rtl" class="gmail-p2" style="margin:0px;text-align:left;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">-ش????kB??C???Ã͞}&k?Xb?8/?ν?fF??&v;?Š????<span class="gmail-Apple-tab-span" style="white-space:pre">      </span>??</span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">crash: /home/user/vmem_vmss_jan26/usr/lib/debug/usr/lib/modules/4.14.11-coreos/vmlinux and /home/user/vmem_vmss_jan26/gt-server2-gmt-612746ca.vmss do not match!</span></p>
<p class="gmail-p3" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0);min-height:17px"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"></span><br></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Usage:</span></p>
<p class="gmail-p3" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0);min-height:17px"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"></span><br></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><span class="gmail-Apple-converted-space">  </span>crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS]<span class="gmail-Apple-tab-span" style="white-space:pre">     </span>(dumpfile form)</span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"><span class="gmail-Apple-converted-space">  </span>crash [OPTION]... [NAMELIST] <span class="gmail-Apple-converted-space">            <span class="gmail-Apple-tab-span" style="white-space:pre">     </span><span class="gmail-Apple-tab-span" style="white-space:pre">      </span></span>(live system form)</span></p>
<p class="gmail-p3" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0);min-height:17px"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures"></span><br></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Enter "crash -h" for details.</span></p>
<p class="gmail-p1" style="margin:0px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15px;line-height:normal;font-family:"Courier New";color:rgb(255,255,255);background-color:rgb(0,0,0)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">[root@gt-server2-gmt mfusion]#</span></p>


<br></div><div>1. Does crash utility reads a 60GB file successfully ? Or is there a limit to file size ?</div><div>2. What does the garbage in linux_banner mean ?</div><div><br></div><div>Can someone please guide me on reading the memory dump ?</div><div><br></div><div>Thank you,</div><div>Eshak</div></div>