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  1. Bug #2007908
  2. Comment #0

Comment 0 for bug 2007908

Revision history for this message
Po-Hsu Lin (cypressyew) wrote : [Possible Regression] powerpc/tm:tm-resched-dscr in ubuntu_kernel_selftests failed

Issue found with J-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 see this issue in Jammy 5.15 as Power8 was not supported there, and this test was skipped on the Power9 node (looks like because of the lack of PPC_FEATURE2_HTM)