Public bug reported:
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
sudo bpftrace -e 'kprobe:cmos_interrupt { printf("%s\n", probe) }'
Attaching 1 probe...
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
On -1031 no interrupt is detected. I think this might be caused by
017314318ad4 ("rtc: cmos: Call cmos_wake_setup() from cmos_do_probe()")
** Affects: linux-oracle (Ubuntu)
Importance: Undecided
Status: New
** Tags: sr20230227
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https://bugs.launchpad.net/bugs/2011854
Title:
cmos_interrupt not getting called
Status in linux-oracle package in Ubuntu:
New
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
sudo bpftrace -e 'kprobe:cmos_interrupt { printf("%s\n", probe) }'
Attaching 1 probe...
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
kprobe:cmos_interrupt
On -1031 no interrupt is detected. I think this might be caused by
017314318ad4 ("rtc: cmos: Call cmos_wake_setup() from
cmos_do_probe()")
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