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[Po-Hsu Lin <2109522@xxxxxxxxxxxxxxxxxx>]

OK, so this seems to be related to the limited debugfs access:
2025-04-29T10:19:17.815206+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test kernel: zswap: loaded using pool lzo/zbud
2025-04-29T10:19:17.836439+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test stress-ng: invoked with './stress-ng -v -t 5 --sigbus 4 --sigbus-ops 3000 --ignite-cpu --syslog --verbose --verify --oomable' by user 0 'root'
2025-04-29T10:19:17.836603+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test stress-ng: system: 'n-laz-azfde-s2-stddc2asv5-u-stress-smk-test' Linux 6.8.0-1028-azure #33-Ubuntu SMP Tue Apr 22 19:41:44 UTC 2025 x86_64
2025-04-29T10:19:17.836652+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test stress-ng: memory (MB): total 7482.65, free 6059.09, shared 8.94, buffer 40.50, swap 0.00, free swap 0.00
2025-04-29T10:19:17.836708+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test stress-ng: stress-ng: info:  [15271] setting to a 5 secs run per stressor
2025-04-29T10:19:17.838229+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test stress-ng: stress-ng: info:  [15271] dispatching hogs: 4 sigbus
2025-04-29T10:19:17.839209+00:00 n-laz-azfde-s2-stddc2asv5-u-stress-smk-test kernel: Lockdown: stress-ng: debugfs access is restricted; see man kernel_lockdown.7

I will bring this to upstream first.

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https://bugs.launchpad.net/bugs/2109522

Title:
  Timeout on sigbus test in ubuntu_stress_smoke_test on CVM instances

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on the azure-fde flavor of oracular:linux-azure
  6.11.0-1014.14

  Test fails with the following:
  INFO |     START    ubuntu_stress_smoke_test.sigbus    ubuntu_stress_smoke_test.sigbus    timeout=2100    timestamp=1745563252    localtime=Apr 25 06:40:52    
  DEBUG| Persistent state client._record_indent now set to 2
  DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_stress_smoke_test.sigbus', 'ubuntu_stress_smoke_test.sigbus')
  DEBUG| Waiting for pid 226646 for 2100 seconds
  WARNI| System python is too old, crash handling disabled
  DEBUG| Running '/home/azure/autotest/client/tests/ubuntu_stress_smoke_test/ubuntu_stress_single_smoke_test.sh sigbus'
  DEBUG| [stdout] Free memory: 62153 MB
  DEBUG| [stdout] Memory used: 55938 MB
  DEBUG| [stdout] Using cgroup version 2
  DEBUG| [stdout]  
  DEBUG| [stdout] Machine Configuration
  DEBUG| [stdout] Physical Pages:  16211253
  DEBUG| [stdout] Pages available: 15911301
  DEBUG| [stdout] Page Size:       4096
  DEBUG| [stdout] Zswap enabled:   Y
  DEBUG| [stdout]  
  DEBUG| [stdout] Free memory:
  DEBUG| [stdout]                total        used        free      shared  buff/cache   available
  DEBUG| [stdout] Mem:        64845012     1477684    63645204        1472      368096    63367328
  DEBUG| [stdout] Swap:        1048572        1864     1046708
  DEBUG| [stdout]  
  DEBUG| [stdout] Number of CPUs: 8
  DEBUG| [stdout] Number of CPUs Online: 8
  DEBUG| [stdout] 
  DEBUG| [stdout] Maximum bogo ops: 3000
  DEBUG| [stdout]  
  DEBUG| [stdout] sigbus STARTING
  INFO | Timer expired (2100 sec.), nuking pid 226646
  INFO |         ERROR    ubuntu_stress_smoke_test.sigbus    ubuntu_stress_smoke_test.sigbus    timestamp=1745565353    localtime=Apr 25 07:15:53    Test timeout expired, rc=15

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