[Bug 1887143] Re: mdmonitor closes mdstat fd if is empty

[Mariusz Tkaczyk]

Hi,
Patches have been accepted upstream:
https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=e2308733910a157b0a4d4e78721f239d44b91a24
https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=cab9c67d461c65a1138359f9f6d39636466b90e4

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https://bugs.launchpad.net/bugs/1887143

Title:
  mdmonitor closes mdstat fd if is empty

Status in mdadm package in Ubuntu:
  New

Bug description:
  There was a change in mdadm to fix issue when md_mod is reloaded (not a case for ubuntu because md_mod is build-in). Commit:
  https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=52209d6ee1183581e148791cf6ee4d60a0193b1d

  The fix prevents mdmonitor from occupying mdstat file descriptor in there is no any mddevice available.
  As a side effect mdmonitor cannot react on md events because it is waiting in undefined resource (probably 1 which in demonize mode case is /dev/null).

  When mdmonitor is started form command line and there was one
  mdmonitor already active, error message also is omitted, because error
  is thrown after forking. As a result, unexpectedly we may got same
  same issue after array creation.

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