Public bug reported:

== Comment: #0 - Hariharan T S <[email protected]> - 2025-04-14 22:11:27 ==
Summary 

LTP irqbalance01 test failed on Ubuntu25.04

log : 
root@ltcrain85-lp8:/opt/ltp/testcases/bin# ./irqbalance01
tst_test.c:1900: TINFO: LTP version: 20250130
tst_test.c:1904: TINFO: Tested kernel: 6.14.0-15-generic #15-Ubuntu SMP Sun Apr 
 6 14:52:42 UTC 2025 ppc64le
tst_kconfig.c:88: TINFO: Parsing kernel config 
'/lib/modules/6.14.0-15-generic/build/.config'
tst_test.c:1722: TINFO: Overall timeout per run is 0h 00m 30s
irqbalance01.c:129: TINFO: Found 16 CPUS, 5 IRQs
  IRQ       CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       
CPU6       CPU7       CPU8       CPU9       CPU10      CPU11      CPU12      
CPU13      CPU14      CPU15
   18:     96520+     44876+     26046+     48937+     17695+     27958+     
18892+     22146+     69772+     53599+     61601+     54649+     16839+     
18987+     23602+     22439+
   48:         0+         0+         0+         0+         0+         0+        
 0+         0+         0+         0+         0+         0+         0+         
0+         0+         0+
   49:         0+         0+         0+         0+         0+         0+        
 1+        12+       448+         0+         0+         0+         0+         
0+         0+         0+
   50:         0+         0+         0+         0+         0+         0+     
36451+         0+         0+         0+         0+         0+         0+        
 0+         0+         0+
   51:         0+         0+     20779+         0+         0+         0+        
 0+         0+         0+         0+         0+         0+         0+         
0+         0+         0+
Total:     96520      44876      46825      48937      17695      27958      
55344      22158      70220      53599      61601      54649      16839      
18987      23602      22439
irqbalance01.c:129: TINFO: Found 16 CPUS, 5 IRQs
irqbalance01.c:290: TFAIL: Heuristic: Detected 0 irq-cpu pairs have been 
dissallowed


System Details
root@ltcrain85-lp8:~# uname -a
Linux ltcrain85-lp8 6.14.0-15-generic #15-Ubuntu SMP Sun Apr  6 14:52:42 UTC 
2025 ppc64le ppc64le ppc64le GNU/Linux
root@ltcrain85-lp8:~# cat /etc/os-release
PRETTY_NAME="Ubuntu Plucky Puffin (development branch)"
NAME="Ubuntu"
VERSION_ID="25.04"
VERSION="25.04 (Plucky Puffin)"
VERSION_CODENAME=plucky
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
UBUNTU_CODENAME=plucky
LOGO=ubuntu-logo
root@ltcrain85-lp8:~# lscpu
Architecture:             ppc64le
  Byte Order:             Little Endian
CPU(s):                   16
  On-line CPU(s) list:    0-15
Model name:               POWER10 (architected), altivec supported
  Model:                  2.0 (pvr 0080 0200)
  Thread(s) per core:     8
  Core(s) per socket:     2
  Socket(s):              1
Virtualization features:
  Hypervisor vendor:      pHyp
  Virtualization type:    para
Caches (sum of all):
  L1d:                    128 KiB (4 instances)
  L1i:                    192 KiB (4 instances)
  L2:                     4 MiB (4 instances)
  L3:                     16 MiB (4 instances)
NUMA:
  NUMA node(s):           1
  NUMA node2 CPU(s):      0-15
Vulnerabilities:
  Gather data sampling:   Not affected
  Ghostwrite:             Not affected
  Itlb multihit:          Not affected
  L1tf:                   Not affected
  Mds:                    Not affected
  Meltdown:               Not affected
  Mmio stale data:        Not affected
  Reg file data sampling: Not affected
  Retbleed:               Not affected
  Spec rstack overflow:   Not affected
  Spec store bypass:      Not affected
  Spectre v1:             Mitigation; __user pointer sanitization, ori31 
speculation barrier enabled
  Spectre v2:             Mitigation; Software count cache flush (hardware 
accelerated), Software link stack flush
  Srbds:                  Not affected
  Tsx async abort:        Not affected
root@ltcrain85-lp8:~# free -h
               total        used        free      shared  buff/cache   available
Mem:            30Gi       8.7Gi        17Gi        14Mi       5.1Gi        22Gi
Swap:          8.0Gi          0B       8.0Gi

== Comment: #2 - Hariharan T S <[email protected]> - 2025-04-14 22:22:00 ==
root@ltcrain85-lp8:~# numactl -H
available: 1 nodes (2)
node 2 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
node 2 size: 31586 MB
node 2 free: 17476 MB
node distances:
node   2
  2:  10

** Affects: irqbalance (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-212397 severity-high 
targetmilestone-inin2510

** Tags added: architecture-ppc64le bugnameltc-212397 severity-high
targetmilestone-inin2510

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https://bugs.launchpad.net/bugs/2107549

Title:
  [Ubuntu25.04] LTP test irqblance01 failed

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