Bug 442711 - hwclock cannot access the Hardware Clock
hwclock cannot access the Hardware Clock
Product: Fedora
Classification: Fedora
Component: util-linux-ng (Show other bugs)
x86_64 Linux
low Severity medium
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Assigned To: Karel Zak
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2008-04-16 08:20 EDT by Ilkka Tengvall
Modified: 2008-04-18 01:53 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-04-18 01:53:16 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
dmidecode, lspci -vvv, cpuinfo, lsmod (59.73 KB, text/plain)
2008-04-16 08:20 EDT, Ilkka Tengvall
no flags Details

  None (edit)
Description Ilkka Tengvall 2008-04-16 08:20:35 EDT
Description of problem:

hwclock can not get a hold on hardware clock. This causes ntpd to fail also, I

Version-Release number of selected component (if applicable):

How reproducible:
every time

Steps to Reproduce:
1. do "hwclock --show" as root
Actual results:

hwclock --rtc=/dev/rtc0 --debug --show
hwclock from util-linux-ng 2.13.1
hwclock: Open of /dev/rtc0 failed, errno=16: Device or resource busy.
No usable clock interface found.
Cannot access the Hardware Clock via any known method.

Expected results:
Show/set system time correctly.

Additional info:

[root@whipper ~]# cat /sys/class/rtc/rtc0/dev
[root@whipper ~]# ls -lZ /dev/rtc0
crw-r--r--  root root system_u:object_r:clock_device_t:s0 /dev/rtc0
[root@whipper ~]# ls -l /dev/rtc0
crw-r--r-- 1 root root 254, 0 2008-04-16 19:56 /dev/rtc0
Comment 1 Ilkka Tengvall 2008-04-16 08:20:35 EDT
Created attachment 302590 [details]
dmidecode, lspci -vvv, cpuinfo, lsmod
Comment 2 Karel Zak 2008-04-16 09:39:51 EDT
Why do you need to use the option --rtc? Without this option hwclock(8) is
trying to open other clock devices.

It would be nice to check logs for AVC denial messages too.
Comment 3 Ilkka Tengvall 2008-04-18 01:53:16 EDT
Today I received new kernel via updates. I don't know if it was that, but
hwclock started working.

Kzak: No, I did not see AVC denials and it was the same without --rtc, I just
tried to force it for the right clock if it would not have found it otherwise.

Works now, so the bug can be closed.

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