After upgrading to vSphere 7.0 U3, ESXi hosts may experience a Purple Diagnostic Screen (PSOD) when a virtual machine issues an UNMAP or TRIM command on thin-provisioned virtual disks.
VMware vSphere ESXi 7.0.3
Please refer to VMware KB article 86100 for details: ESXi 7.0 Update 3 host fails with a backtrace NMI IPI: Panic requested by another PCPU.