I have not determined if the fault occurs after 10^15 or 2^30 bytes, but
the former seems more probable. Perhaps the code does something like
read from /sys/class/net/eth0/statistics/{rx,tx}_bytes into a 16 byte
buffer, which would fail at 10^15. But a quick look through the network-
manager source didn't turn up anything like that.

I'll provide the ifconfig output once the problem happens again.

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https://bugs.launchpad.net/bugs/1222377

Title:
  network-manager stops connecting to Wi-Fi after 1 PB transferred on
  any interface

Status in “network-manager” package in Ubuntu:
  Incomplete

Bug description:
  Transfer 1 PB or more over any eth* interface (not tested with lo,
  impractical to test with wlan*). Use ifconfig to confirm interface
  byte counters.

  Once a counter exceeds 1 PB, network-manager will fail to connect to
  any Wi-Fi access points, though existing connections will stay up.

  A single 10 Gb/s link can transfer 1 PB in two weeks.

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