About one night out of three, my virtual machines running Debian 8 are freezing during the backups execution.
According to the logs of the kernel, this would be due to rcu_sched.
I use the following kernel :
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Linux srv-xivo1 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64 GNU/Linux
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Jul 8 22:35:04 srv-xivo1 kernel: [105129.524054] INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected by 2, t=10028 jiffies, g=3028935, c=3028934, q=4)
Jul 8 22:35:04 srv-xivo1 kernel: [105129.524119] sending NMI to all CPUs:
Jul 8 22:35:04 srv-xivo1 kernel: [105129.524130] NMI backtrace for cpu 2
Jul 8 22:35:04 srv-xivo1 kernel: [105129.524133] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G O 3.16.0-4-amd64 #1 Debian 3.16.39-1+deb8u2
Jul 8 22:35:04 srv-xivo1 kernel: [105129.524134] Hardware name: VMware, Inc. VMware7,1/440BX Desktop Reference Platform, BIOS VMW71.00V.0.B64.1506250318 06/25/2015
Regards