[Qemu-devel] [Bug 1058225] Re: When setting hardware clock on linux guest, hwclock shows crazy date (in the year 2043)

[Lucas Meneghel Rodrigues]

Paolo fixed the problem with upstream commit:

commit b6db4aca20e9af4f62c9c9e08b9b9672a6ed3390
Author: Paolo Bonzini <address@hidden>
Date:   Mon Oct 1 14:22:06 2012 +0200

    rtc: fix overflow in mktimegm
    
    When setting a date in 1980, Linux is actually disregarding the century
    byte and setting the year to 2080.  This causes a year-2038 overflow
    in mktimegm.  Fix this by doing the days-to-seconds computation in
    64-bit math.
    
    Reported-by: Lucas Meneghel Rodrigues <address@hidden>
    Signed-off-by: Paolo Bonzini <address@hidden>
    Signed-off-by: Anthony Liguori <address@hidden>

Confirmed that problem is solved. Closing bug.

** Changed in: qemu
       Status: New => Confirmed

** Changed in: qemu
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1058225

Title:
  When setting hardware clock on linux guest, hwclock shows crazy date
  (in the year 2043)

Status in QEMU:
  Fix Committed

Bug description:
  Very easy to reproduce:

  1) Build the latest qemu.git (we've captured this on internal
  automated testing, verified manually), the commit for reference is:

  14:07:02 INFO | git commit ID is
  6f8fd2530e9a530f237240daf1c981fa5df7f978 (tag v1.2.0-461-g6f8fd25)

  2) Install a linux guest in it (caught with RHEL 6.2, verified with
  Fedora 17)

  3) In the linux guest, set the hardware clock with hwclock:

  /sbin/hwclock --set --date "2/2/80 03:04:00"

  4) Verify if hardware clock was set back to the eighties:

  LC_ALL=C /sbin/hwclock

  5) Observe amazed that hwclock reports a date in the year 2043:

  14:09:34 INFO |          ('hwclock', 'FAIL', 2, "Failed to set hwclock
  back to the eighties. Output of hwclock is 'Sun Dec 27 20:35:46 2043
  -0.489664 seconds'")

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