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This buildbot runs in a VM. I need more information on the host (machine running the VM): OS, OS version, kernel version, hardware virtualization?, version of qemu/kvm?, etc.
It's probably a bug in the virtualization.
In the PEP 418, we decided to _not_ handle this error (monotonic clock running backward).
Maybe we should document the bug and remove the assertion (it only exists when Python is compiled in debug mode).
Note: I already saw this assertion error on the same buildbot.
http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/2436/steps/test/logs/stdio
== CPython 3.6.0a0 (default:2825c87d3f72, Jul 25 2015, 01:29:19) [GCC 4.7.2]
== Linux-3.2.0-4-amd64-x86_64-with-debian-7.7 little-endian
== hash algorithm: siphash24 64bit
== /root/buildarea/3.x.angelico-debian-amd64/build/build/test_python_27852
http://buildbot.python.org/all/buildslaves/angelico-debian-amd64
Slave information
* Buildbot-Slave 0.8.6p1
* Debian AMD64 running tests as root - VM with two Intel i5 cores