irq:irqbalance01 in ubuntu_ltp failed with "Heuristic: Detected 0 irq-cpu pairs have been dissallowed"

[Po-Hsu Lin]

Issue spotted on:
 * Focal Azure 5.4.0-1065.68
 * Focal Azure 5.11.0-1023.24~20.04.1
 * Focal Azure 5.13.0-1009.10~20.04.2

This is a new test added recently (bug 1955398), not a regression.

Test failed with:
  irqbalance01.c:287: TFAIL: Heuristic: Detected 0 irq-cpu pairs have been dissallowed

Test log:
Checking for required user/group ids

'nobody' user id and group found.
'bin' user id and group found.
'daemon' user id and group found.
Users group found.
Sys group found.
Required users/groups exist.
no big block device was specified on commandline.
Tests which require a big block device are disabled.
You can specify it with option -z
INFO: Test start time: Mon Dec 20 14:17:04 UTC 2021
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 497877 -n 497877 -f /tmp/ltp-2QCx4vbN3V/alltests -l /dev/null -C /dev/null -T /dev/null
LOG File: /dev/null
FAILED COMMAND File: /dev/null
TCONF COMMAND File: /dev/null
Running tests.......
tst_test.c:1423: TINFO: Timeout per run is 0h 05m 00s
irqbalance01.c:129: TINFO: Found 32 CPUS, 8 IRQs
  IRQ CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 CPU8 CPU9 CPU10 CPU11 CPU12 CPU13 CPU14 CPU15 CPU16 CPU17 CPU18 CPU19 CPU20 CPU21 CPU22 CPU23 CPU24 CPU25 CPU26 CPU27 CPU28 CPU29 CPU30 CPU31
    0: 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
    1: 0+ 0+ 0+ 0+ 0+ 9+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
    4: 0+ 0+ 0+ 0+ 0+ 0+ 0+ 1976+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
    8: 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
    9: 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0+ 0+ 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0- 0-
   12: 0+ 0+ 0+ 0+ 3+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
   14: 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
   15: 0+ 0+ 0+ 2999+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+ 0+
Total: 0 0 0 2999 3 9 0 1976 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
irqbalance01.c:129: TINFO: Found 32 CPUS, 8 IRQs
irqbalance01.c:287: TFAIL: Heuristic: Detected 0 irq-cpu pairs have been dissallowed

Summary:
passed 0
failed 1
broken 0
skipped 0
warnings 0

Note that this test will be skipped on system that with only 1 cpu.

[Luke Nowakowski-Krijger (lukenow)]

Found on 2022.01.31/bionic/linux-lowlatency/4.15.0-169.177 on node fozzie

[Po-Hsu Lin (cypressyew)]

Found on F-gcp 5.4.0-1085.93 / B-gcp-5.4.0-1085.93~18.04.1 as well, ARM64 instance t2a-standard-4 only.

[Portia Stephens (portias)]

Also seen in focal xilinx-linux-zyqnmp-5.4.0-1018.21

[Po-Hsu Lin (cypressyew)]

Looks like this issue will gone with LTP 20230516, commit 3ebc2dfa85c