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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1835350

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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: eoan

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https://bugs.launchpad.net/bugs/1835350

Title:
  Hang / zombie process from Xarray page-fault conversion

Status in intel:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Description:

  We're seeing a case where RocksDB hangs and becomes defunct when
  trying to kill the process. v4.19 succeeds and v4.20 fails. Robert was
  able to bisect this to commit b15cd800682f "dax: Convert page fault
  handlers to XArray".

  Target Release: 19.10
  Target Kernel: 5.3

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