Hi Andy, This is bare metal, not VM, read my other email in this thread about the machine on which I am testing. Sometime hang happens a little later: [ 5.088948] microcode: CPU36 sig=0x406f1, pf=0x1, revision=0xb00001d [ 5.096076] microcode: CPU37 sig=0x406f1, pf=0x1, revision=0xb00001d [ 5.103206] microcode: CPU38 sig=0x406f1, pf=0x1, revision=0xb00001d [ 5.110326] microcode: CPU39 sig=0x406f1, pf=0x1, revision=0xb00001d [ 5.117467] microcode: Microcode Update Driver: v2.01 <tigran@xxxxxxxxxxxxxxxxxxxx>, Peter Oruba [ 5.127476] registered taskstats version 1 [ 5.132058] Loading compiled-in X.509 certificates [ 5.138206] Loaded X.509 cert 'Build time autogenerated kernel key: 26871d9e2c53359981a91797284d4f630796d8cf' [ 5.149337] zswap: loaded using pool lzo/zbud [ 5.154215] page_owner is disabled [ 5.161468] Key type trusted registered [ 5.169226] Key type encrypted registered [ 5.173719] ima: No TPM chip found, activating TPM-bypass! [ 5.179918] evm: HMAC attrs: 0x1 [ 5.184958] rtc_cmos 00:00: setting system clock to 2018-01-05 15:40:45 UTC (1515166845) [ 5.196099] Freeing unused kernel memory: 1856K <hang / reboot here> Thank you, Pavel