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[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

Those kernel patches fix the problem. Changing the package to linux,
I'll get those patches into xenial's kernel.

Ryan, thanks for the help.

** Package changed: qemu (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Seth Forshee (sforshee)

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Seth Forshee (sforshee)

** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1649718

Title:
  Linux rtc self test fails in a VM under xenial

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress

Bug description:
  ADT testing for the linux package hangs at the kernel's rtc selftest,
  for example:

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-zesty/zesty/amd64/l/linux/20161212_132117_a258d@/log.gz

  Running this test manually, I've observed that this will hang in me
  with various kernel versions going back to 4.4 in a VM on my machine
  which is running xenial. The test runs to completion in a VM on a
  different machine running zesty.

  This is the section of the test which produces the hang:

          /* Turn on update interrupts (one per second) */
          retval = ioctl(fd, RTC_UIE_ON, 0);
          if (retval == -1) {
                  if (errno == EINVAL) {
                          fprintf(stderr,
                                  "\n...Update IRQs not supported.\n");
                          goto test_READ;
                  }
                  perror("RTC_UIE_ON ioctl");
                  exit(errno);
          }

          fprintf(stderr, "Counting 5 update (1/sec) interrupts from reading %s:",
                          rtc);
          fflush(stderr);
          for (i=1; i<6; i++) {
                  /* This read will block */
                  retval = read(fd, &data, sizeof(unsigned long));
                  if (retval == -1) {
                          perror("read");
                          exit(errno);
                  }
                  fprintf(stderr, " %d",i);
                  fflush(stderr);
                  irqcount++;
          }

  The read blocks indefinitely most of the time. After boot it might
  return once or twice before it hangs, but running the test
  subsequently always hangs on the first read. I'll attach the full
  source for the test (rtctest.c).

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