canonical-ubuntu-qa team mailing list archive

[Po-Hsu Lin <2011854@xxxxxxxxxxxxxxxxxx>]

** Tags added: sru-20230515

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https://bugs.launchpad.net/bugs/2011854

Title:
  cmos_interrupt not getting called

Status in ubuntu-kernel-tests:
  New
Status in linux-oracle-5.15 package in Ubuntu:
  Fix Committed
Status in linux-oracle-5.15 source package in Focal:
  Fix Released
Status in linux-oracle-5.15 source package in Jammy:
  Fix Released

Bug description:
  The ubuntu_ltp_kernel_misc rtc01 test case has exposed a possible
  regression of the RTC cmos driver on certain Oracle clouds.

  This was observed on jammy:linux-oracle-5.15.0-1031.37.
  - VM.DenseIO2.8
  - VM.Standard2.1

  rtc01       0  TINFO  :  RTC READ TEST:
  rtc01       1  TPASS  :  RTC READ TEST Passed
  rtc01       0  TINFO  :  Current RTC date/time is 16-3-2023, 17:36:04.
  rtc01       0  TINFO  :  RTC ALARM TEST :
  rtc01       0  TINFO  :  Alarm time set to 17:36:09.
  rtc01       0  TINFO  :  Waiting 5 seconds for the alarm...
  rtc01       2  TFAIL  :  rtc01.c:151: Timed out waiting for the alarm
  rtc01       0  TINFO  :  RTC UPDATE INTERRUPTS TEST :
  rtc01       0  TINFO  :  Waiting for  5 update interrupts...
  rtc01       3  TFAIL  :  rtc01.c:208: Timed out waiting for the update interrupt
  rtc01       0  TINFO  :  RTC Tests Done!

  Notice that we successfully enable RTC_AIE_ON, unlike
  VM.Standard.A1.Flex-4c.8m which does not support it. I confirmed with
  bpftrace on -1029 that we see the cmos interrupt (part of ltp
  read_alarm_test)

  sudo bpftrace -e 'kprobe:cmos_interrupt { printf("%s\n", probe) }'
  Attaching 1 probe...
  kprobe:cmos_interrupt

  On -1031 no interrupt is detected for both the alarm and update tests.

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