Environment ----------- Logs have the hostname masked on purpose. (XEN) Xen version 4.6.0 (Debian 4.6.0-1+nmu2) (ijc@xxxxxxxxxx) (gcc (Debian 5.3.1-8) 5.3.1 20160205) debug=n Tue Feb 9 17:46:27 UTC 2016 (XEN) Bootloader: GRUB 2.02~beta2-36 (XEN) Command line: placeholder dom0_mem=2048M,max:2048M noreboot dom0_max_vcpus=1 com1=115200,8n1 console=com2 no-real-mode edd=off - When dom0_mem is set to < 2048MB, Xen is stable. - When dom0_mem is set to ~ 2048MB, I experience random Xen crashes, host reboots unless noreboot is set. - When dom0_mem is set to > 2048MB, Xen is stable. Board: X10SRi-F with BIOS version 1.0 with BIOS version 1.0b [*] This issue is not happening in another node with a very similar hardware and same system that has dom0_mem set to 2048. Notes: ------ - OS: Debian GNU/Linux stretch/sid, up to date. - Hardware has been tested: CPU and RAM seem to be just fine. - The parameters related with no-real-mode and edd=off or even x2apic=off (whereas important those have no impact on this issue and the above has been tested with and without those extra arguments.) Test: ----- # Uptime | System Boot up ----------------------------+--------------------------------------------------- 1 48 days, 02:50:48 | Linux 4.6.0-1-amd64 Thu Aug 18 15:26:15 2016 -> 2 5 days, 11:39:20 | Linux 4.7.0-1-amd64 Tue Oct 18 22:25:47 2016 Dom0 with 4096 RAM, Uptime 5 days: seems stable. Same hardware, linux params, xen params, debian packages. 3 1 day , 00:49:03 | Linux 4.7.0-1-amd64 Mon Oct 17 09:24:58 2016 4 0 days, 12:06:45 | Linux 4.7.0-1-amd64 Sun Oct 9 02:21:41 2016 5 0 days, 09:19:27 | Linux 4.7.0-1-amd64 Thu Oct 13 23:57:20 2016 6 0 days, 06:30:09 | Linux 4.7.0-1-amd64 Wed Oct 5 21:39:57 2016 7 0 days, 04:45:58 | Linux 4.7.0-1-amd64 Tue Oct 18 10:17:40 2016 8 0 days, 04:20:06 | Linux 4.7.0-1-amd64 Mon Oct 10 11:47:40 2016 9 0 days, 04:10:09 | Linux 4.7.0-1-amd64 Thu Oct 13 09:29:21 2016 10 0 days, 03:10:09 | Linux 4.7.0-1-amd64 Tue Oct 11 09:05:44 2016 ----------------------------+--------------------------------------------------- no1 in 42 days, 15:11:29 | at Tue Dec 6 01:16:35 2016 up 58 days, 13:04:00 | since Thu Aug 18 15:26:15 2016 down 8 days, 05:34:52 | since Thu Aug 18 15:26:15 2016 %up 87.672 | since Thu Aug 18 15:26:15 2016 # Uptime | System Boot up ----------------------------+--------------------------------------------------- 1 48 days, 02:50:48 | Linux 4.6.0-1-amd64 Thu Aug 18 15:26:15 2016 2 5 days, 11:39:41 | Linux 4.7.0-1-amd64 Tue Oct 18 22:25:47 2016 3 1 day , 00:49:03 | Linux 4.7.0-1-amd64 Mon Oct 17 09:24:58 2016 4 0 days, 12:06:45 | Linux 4.7.0-1-amd64 Sun Oct 9 02:21:41 2016 5 0 days, 09:19:27 | Linux 4.7.0-1-amd64 Thu Oct 13 23:57:20 2016 6 0 days, 06:30:09 | Linux 4.7.0-1-amd64 Wed Oct 5 21:39:57 2016 7 0 days, 04:45:58 | Linux 4.7.0-1-amd64 Tue Oct 18 10:17:40 2016 8 0 days, 04:20:06 | Linux 4.7.0-1-amd64 Mon Oct 10 11:47:40 2016 9 0 days, 04:10:09 | Linux 4.7.0-1-amd64 Thu Oct 13 09:29:21 2016 10 0 days, 03:10:09 | Linux 4.7.0-1-amd64 Tue Oct 11 09:05:44 2016 ----------------------------+--------------------------------------------------- -> 47 0 days, 00:23:24 | Linux 4.7.0-1-amd64 Mon Oct 24 10:36:30 2016 Dom0 with 2048MB RAM, Xen crash in less than 30min prior to this. ----------------------------+--------------------------------------------------- 1up in 0 days, 00:01:15 | at Mon Oct 24 11:01:07 2016 t10 in 0 days, 02:46:46 | at Mon Oct 24 13:46:38 2016 no1 in 48 days, 02:27:25 | at Sun Dec 11 13:27:17 2016 up 58 days, 13:07:37 | since Thu Aug 18 15:26:15 2016 down 8 days, 06:26:02 | since Thu Aug 18 15:26:15 2016 %up 87.625 | since Thu Aug 18 15:26:15 2016