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[Bug 2007908] Re: powerpc/tm:tm-resched-dscr in ubuntu_kernel_selftests flaky on P8 node gulpin

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Jürg Häfliger <2007908@xxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Apr 2025 22:41:10 -0000
Reply-to: Bug 2007908 <2007908@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2007908

Title:
  powerpc/tm:tm-resched-dscr in ubuntu_kernel_selftests flaky on P8 node
  gulpin

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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