Okay, it was found experimentally that the problem is reproduced if
vm.mmap_min_addr is greater than 53249. If from 0 to 53249 - everything
works. What can this be related to?

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https://bugs.launchpad.net/bugs/1891748

Title:
  qemu-arm-static 5.1 can't run gcc

Status in QEMU:
  Fix Released
Status in Juju Charms Collection:
  New

Bug description:
  Issue discovered while trying to build pikvm (1)

  Long story short: when using qemu-arm-static 5.1, gcc exits whith
  message:

  Allocating guest commpage: Operation not permitted

  
  when using qemu-arm-static v5.0, gcc "works"

  Steps to reproduce will follow

  (1)  https://github.com/pikvm/pikvm/blob/master/pages/building_os.md

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