The problem is obviously there, but I tried pretty hard to make it fail and couldn't so it seems latent. If you can, please provide a patch to tests/rtc-test.c that shows the bug.
** Changed in: qemu Status: New => Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1090558 Title: hw/mc146818: error reading RTC_HOURS_ALARM Status in QEMU: Incomplete Bug description: get_next_alarm() doesn't read the RTC_HOURS_ALARM field correctly. - Bit 7 must be masked before conversion from BCD. - Care must be taken to check the don't care condition before masking. - The PM bit must be read from RTC_HOURS_ALARM, not from RTC_HOURS (as is done in convert_hour()). Seen in commit e376a788ae130454ad5e797f60cb70d0308babb6. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1090558/+subscriptions