stress tested with the following command on node gulpin with -66 shows
this test is a bit flaky:
failcnt=0
for i in `seq 1 100`; do
time sudo ./tm-resched-dscr
if [ $? -ne 0 ]; then
let "failcnt=$failcnt+1"
fi
done
echo $failcnt
There are 27 failures in 100 attempts.
Next is to stress test with -60
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https://bugs.launchpad.net/bugs/2007908
Title:
[Possible Regression] powerpc/tm:tm-resched-dscr in
ubuntu_kernel_selftests failed on P8
Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
Issue found with Focal hwe-5.15.0-66.73~20.04.1 on Power8 node
"gulpin".
Test failed with:
test: tm_resched_dscr
tags: git_version:bfd31f0-dirty
Binding to cpu 8
main test running as pid 2542
Check DSCR TM context switch:
!! killing tm_resched_dscr
!! child died by signal 15
failure: tm_resched_dscr
Nothing interesting in dmesg / syslog:
$ dmesg | tail
[ 20.556968] IPv6: ADDRCONF(NETDEV_CHANGE): enP34p1s0f0: link becomes ready
[ 20.572182] tg3 0022:01:00.2 enP34p1s0f2: Link is up at 1000 Mbps, full
duplex
[ 20.572187] tg3 0022:01:00.2 enP34p1s0f2: Flow control is off for TX and
off for RX
[ 20.572191] tg3 0022:01:00.2 enP34p1s0f2: EEE is disabled
[ 20.572201] IPv6: ADDRCONF(NETDEV_CHANGE): enP34p1s0f2: link becomes ready
[ 24.598633] kauditd_printk_skb: 19 callbacks suppressed
[ 24.598640] audit: type=1400 audit(1676957767.768:31): apparmor="DENIED"
operation="open" profile="/usr/sbin/ntpd" name="/snap/bin/" pid=2171
comm="ntpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[ 27.682671] loop3: detected capacity change from 0 to 8
[ 28.618195] fbcon: Taking over console
[ 28.747706] Console: switching to colour frame buffer device 128x48
This issue does not exist with 5.15.0-60.66~20.04.1
test: tm_resched_dscr
tags: git_version:bfd31f0-dirty
Binding to cpu 8
main test running as pid 28806
Check DSCR TM context switch: OK
success: tm_resched_dscr
We didn't catch this issue in Jammy 5.15 as Power8 was not supported
there, and this test was skipped on the Power9 node that got tested
with Jammy (looks like because of the lack of PPC_FEATURE2_HTM)
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