CS 4.5.2: all hosts reboot after 3 days at production

[Vadim Kimlaychuk]

Hello all,

        I have experienced accidental cluster reboot 3 days after update 
to CS 4.5.2. Cluster is XenServer 6.5 with SP1. Reboot has been started 
from slave node and then - master.
Syslog on slave shows only this:
Sep  6 00:47:05 xcp2 last message repeated 3 times
Sep  6 00:47:15 xcp2 xenstored:  D12          write     
data/meminfo_free 713732
Sep  6 00:47:15 xcp2 xenstored:  A1564203     w event   
/local/domain/12/data/meminfo_free /local/domain/12/data/meminfo_free
Sep  6 00:47:15 xcp2 xenstored:  D12          write     data/updated Sun 
Sep  6 00:48:55 EEST 2015
Sep  6 00:47:15 xcp2 xenstored:  A6           w event   
/local/domain/12/data/updated /local/domain/12/data/updated
Sep  6 00:47:15 xcp2 xenstored:  A10          w event   
/local/domain/12/data/updated /local/domain/12/data/updated
Sep  6 00:47:26 xcp2 dhclient: DHCPREQUEST on xenbr0 to 172.17.0.1 port 
67 (xid=0x304ae9dc)
Sep  6 00:47:27 xcp2 xapi: [ info|xcp2|462044 INET 
0.0.0.0:80|dispatch:host.call_plugin D:7593b578fada|taskhelper] task 
host.call_plugin R:ddd3cc399f86 forwarded 
(trackid=407f6adaa118a34f19eb1e29cd68a0e8)
Sep  6 00:47:36 xcp2 dhclient: DHCPREQUEST on xenbr0 to 172.17.0.1 port 
67 (xid=0x304ae9dc)
Sep  6 00:48:18 xcp2 last message repeated 4 times
Sep  6 00:48:25 xcp2 xenstored:  D1           write     
data/meminfo_free 1740496
Sep  6 00:48:25 xcp2 xenstored:  A1564203     w event   
/local/domain/1/data/meminfo_free /local/domain/1/data/meminfo_free
Sep  6 00:48:25 xcp2 xenstored:  D1           write     data/updated Sat 
Sep  5 21:50:07 EEST 2015
Sep  6 00:48:25 xcp2 xenstored:  A6           w event   
/local/domain/1/data/updated /local/domain/1/data/updated
Sep  6 00:48:25 xcp2 xenstored:  A10          w event   
/local/domain/1/data/updated /local/domain/1/data/updated
Sep  6 00:48:26 xcp2 dhclient: DHCPREQUEST on xenbr0 to 172.17.0.1 port 
67 (xid=0x304ae9dc)
Sep  6 00:48:27 xcp2 xapi: [ info|xcp2|462044 INET 
0.0.0.0:80|dispatch:host.call_plugin D:f2c8987bc0ff|taskhelper] task 
host.call_plugin R:b62d2d4f58eb forwarded 
(trackid=e3d4ea00c96194830a7dbbfc35563a3c)
Sep  6 00:48:38 xcp2 dhclient: DHCPREQUEST on xenbr0 to 172.17.0.1 port 
67 (xid=0x304ae9dc)
Sep 06 00:48:48 xcp2 syslogd 1.4.1: restart.
Sep  6 00:48:48 xcp2 kernel: klogd 1.4.1, log source = /proc/kmsg 
started.
Sep  6 00:48:48 xcp2 kernel: [    0.000000] Initializing cgroup subsys 
cpuset
Sep  6 00:48:48 xcp2 kernel: [    0.000000] Initializing cgroup subsys 
cpu
Sep  6 00:48:48 xcp2 kernel: [    0.000000] Initializing cgroup subsys 
cpuacct
Sep  6 00:48:48 xcp2 kernel: [    0.000000] Linux version 3.10.0+2

       Can anyone help with diagnostics ?

Thank you,

Vadim.