[Bug 1837235] Re: systemd 229-4ubuntu21.22 ADT test failure with linux 4.4.0-156.183 (storage)

[Kleber Sacilotto de Souza]

This is a kernel bug, introduced by one of these patches applied to
xenial:

commit d823dfc03906fd278ae6f48219c4ed53faee6f9d
Author: Al Viro <viro at zeniv.linux.org.uk>
Date:   Thu Jun 27 20:16:00 2019 +0200

    bio_copy_from_iter(): get rid of copying iov_iter

commit aceb27a7de5fc65a3fc70ccac344f33099e8a4dc
Author: Keith Busch <keith.busch at intel.com>
Date:   Thu Jun 27 20:16:00 2019 +0200

    block: Clear kernel memory before copying to user

commit a713ff5b13e8fd9e331fd84232806316aa9e9b2a
Author: Keith Busch <keith.busch at intel.com>
Date:   Thu Jun 27 20:16:00 2019 +0200

    block/bio: Do not zero user pages

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Title:
  systemd 229-4ubuntu21.22 ADT test failure with linux 4.4.0-156.183
  (storage)

Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  In Progress
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  In Progress
Status in linux source package in Disco:
  Invalid
Status in systemd source package in Disco:
  In Progress
Status in linux source package in Eoan:
  Invalid
Status in systemd source package in Eoan:
  In Progress

Bug description:
  Testing failed on:
      i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/s/systemd/20190719_145555_3528c@/log.gz

  The storage testcase is failing on i386. Running the testcase
  manually, it hangs at:

  systemd-229/debian/tests$ sudo ./storage 
  test_luks_by_devname (__main__.CryptsetupTest)
  LUKS device by plain device name, empty ... Please enter passphrase for disk testcrypt1! 

  Looking at the storage testcase, on function start_password_agent(),
  it expects the 'disk scsi_debug' string on the systemd ask-password
  file, however the contains:

  Message=Please enter passphrase for disk testcrypt1!

  That doesn't seems to happen on other architectures. On amd64, the
  testcase output is:

  systemd-229/debian/tests$ sudo ./storage 
  test_luks_by_devname (__main__.CryptsetupTest)
  LUKS device by plain device name, empty ... Please enter passphrase for disk scsi_debug (testcrypt1)! 
  ok
  [...]

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