[Bug 274402] Re: hwclock can break the RTC
** Changed in: belmont Status: Confirmed = Fix Released -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
** Branch linked: lp:ubuntu/hardy-proposed/util-linux -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
I can confirm that on an i386 machine, repeatedly running the hwclock from util-linux in hardy-updates, version 2.13.1-5ubuntu2, can corrupt the rtc clock (enough so that the hw clock is corrupted). The version of util-linux in hardy-proposed, 2.13.1-5ubuntu3, provides a version that does not. One oddity I do see is that the first time I run the test loop, I get slightly different output than subsequent runs through the loop. On subsequent runs, all instances of hwclock besides the first to be run by the loop report to stderr: Cannot access the Hardware Clock via any known method. Use the --debug option to see the details of our search for an access method. However, the *first* time the loop is run after a fresh reboot, some of the hwclock executions will report to stderr: hwclock: open() of /dev/rtc failed, errno=16: Device or resource busy. Running with --debug shows that the first time failure runs generate the following output: hwclock from util-linux-ng 2.13.1 Using /dev interface to clock. Last drift adjustment done at 1231405767 seconds after 1969 Last calibration done at 1231405767 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... ...got clock tick hwclock: open() of /dev/rtc failedhwclock: open() of /dev/rtc failed, errno=16: Device or resource busy. And that subsequent failure runs generate: hwclock from util-linux-ng 2.13.1 No usable clock interface found. hwclock: Open of /dev/rtc failed, errno=16: Device or resource busy. Cannot access the Hardware Clock via any known method. It's unclear why this happens, but at least with the -proposed util- linux, multiple hwclocks don't seem to corrupt the rtc, it's definitely no longer making the iopl() call. Marking verification-done ** Description changed: Binary package hint: util-linux If multiple copies of hwclock are run simultaneously the RTC can become non-functional. + + TESTCASE: + $ sudo bash -c 'for ((i = 0; i 10; i++)) ; do ( hwclock ) ; done' ** Tags added: verification-done ** Tags removed: verification-needed -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
This bug was fixed in the package util-linux - 2.13.1-5ubuntu3 --- util-linux (2.13.1-5ubuntu3) hardy-proposed; urgency=low * Disable the fallback clause when /dev/rtc cannot be opened. hwclock should not access the x86 RTC using I/O instructions unless explicitly requested from the command line (--directisa). LP: #274402 -- Tim Gardner tim.gard...@canonical.com Thu, 25 Sep 2008 07:51:08 -0600 ** Changed in: util-linux (Ubuntu Hardy) Status: Fix Committed = Fix Released -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 274402] Re: hwclock can break the RTC
Steve Langasek wrote: Can someone who was seeing this bug confirm that the package in hardy- proposed fixes the problem, please? I don't seem to be able to reproduce the original problem, including with an i386 chroot running on an amd64 system; what's the behavior I should expect to see with the buggy version? Steve, Just to confirm, it is impossible to reproduce the problem on a 64bit system, the actual hardware difference makes it quite impossible. The bug can only be reproduced on true 32 bit hardware systems. Cheers, David -- David Mandala davidm at canonical dot com http://www.canonical.com/ Public Key id: 45B2D952 Murphy TX, 75094 +1.214.774.2569 O +1.972.693.4007 C -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
David is correct this is only an i386 problem. -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
Can someone who was seeing this bug confirm that the package in hardy- proposed fixes the problem, please? I don't seem to be able to reproduce the original problem, including with an i386 chroot running on an amd64 system; what's the behavior I should expect to see with the buggy version? -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
** Changed in: netbook-remix Target: 1.0.1 = 1.2.0 -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
this has been fixed for UNR, correct? ** Changed in: netbook-remix Importance: Undecided = High Assignee: (unassigned) = Debbie Beliveau (debbie-beliveau) Status: New = Triaged Target: None = 1.0.1 -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
** Changed in: belmont Importance: Undecided = High Assignee: (unassigned) = Steve Magoun (smagoun) Target: None = rc2 ** Changed in: belmont Status: New = Confirmed -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
** Also affects: netbook-remix Importance: Undecided Status: New ** Also affects: belmont Importance: Undecided Status: New -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
As I understand it, the fix is uploaded, so this bug should be closed. ** Changed in: util-linux (Ubuntu Intrepid) Status: Fix Committed = Fix Released -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
This patch looks a little weird to me, as in it only seems to disable the fallback on i386? Shouldn't that happen on amd64, too? ** Tags added: verification-needed -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
During startup hwclock.sh is run more then once. In rare cases they overlap causing the PC RTC to become non-functional. This is because the second copy of hwclock falls back to using IOPL and direct I/O instructions after it fails to open /dev/rtc (already owned by the first copy of hwclock). The RTC hardware is not designed for such uncontrolled access. -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
SRU Justification Impact: RTC can become non-functional Patch Description: Disable the fallback clause in hwclock.c. It should never use direct I/O access unless explicitly requested as a command line option. Patch: attached Test Case: #!/bin/bash let i=0 while [ $i -lt 10 ] do hwclock let i=$i+1 done ** Attachment added: Disable fallback clause when attempting to open /dev/rtc http://launchpadlibrarian.net/17954131/hwclock.diff -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
Uploaded Hardy util-linux_2.13.1-5ubuntu3 ** Changed in: util-linux (Ubuntu Hardy) Importance: Undecided = High Assignee: (unassigned) = Tim Gardner (timg-tpi) Status: New = Fix Committed Target: None = ubuntu-8.04.2 -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 274402] Re: hwclock can break the RTC
Uploaded Intrepid util-linux_2.13.1-5ubuntu2 ** Changed in: util-linux (Ubuntu Intrepid) Importance: Undecided = Medium Assignee: (unassigned) = Tim Gardner (timg-tpi) Status: New = Fix Committed Target: None = ubuntu-8.10-beta ** Changed in: util-linux (Ubuntu Intrepid) Importance: Medium = High -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 274402] Re: hwclock can break the RTC
On Thu, 2008-09-25 at 13:34 +, Tim Gardner wrote: During startup hwclock.sh is run more then once. This, in of itself, is a bug ;) Scott -- Scott James Remnant [EMAIL PROTECTED] -- hwclock can break the RTC https://bugs.launchpad.net/bugs/274402 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
