Hello,

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.

Since this is a CoreOS VM, I have used toolbox to install and run crash.

When trying to read these files using crash utility, I'm getting the below message:

<read_vmware_vmss: addr: ffffffff81c00100 paddr: 1c00100 cnt: 8>

<readmem: ffffffff81c00100, KVADDR, "read_string characters", 1499, (ROE|Q), 7ffcf595cd70>

<read_vmware_vmss: addr: ffffffff81c00100 paddr: 1c00100 cnt: 1499>

linux_banner:

-ش????kB??C???Ã͞}&k?Xb?8/?ν?fF??&v;?Š???? ??

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!

Usage:

crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS] (dumpfile form)

crash [OPTION]... [NAMELIST] (live system form)

Enter "crash -h" for details.

[root@gt-server2-gmt mfusion]#

1. Does crash utility reads a 60GB file successfully ? Or is there a limit to file size ?

2. What does the garbage in linux_banner mean ?

Can someone please guide me on reading the memory dump ?

Thank you,

Eshak