IJ34813: HARD LOCKUP AT PEMSCOMPROLLUPWORKER THREAD

APAR status

• Closed as program error.

Error description

• Hard lockup between 2 pemsmod kernel threads
  can panic the kernel. A kernel panic will mean system
  down time and maybe quorum loss for the customer.
  Stack trace at vmcore-dmesg.txt will have
  something like this:
  [88432.803601] CPU: 27 PID: 14563 Comm:
  pemsRollUpQueue Kdump: loaded Tainted: G
  

Local fix

Problem summary

• Hard lockup between 2 pemsmod kernel threads
  can panic the kernel. A kernel panic will mean system
  down time and maybe quorum loss for the customer.
  Stack trace at vmcore-dmesg.txt will have
  something like this:
  [88432.803601] CPU: 27 PID: 14563 Comm:
  pemsRollUpQueue Kdump: loaded Tainted: G
  

Problem conclusion

• This problem is fixed in 5.0.5  PTF 10
  Benefits of the solution:
  Avoid system down and quorum loss.
  To see all Spectrum Scale APARs and
  their respective fix solutions refer to page
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
  apars.html
  Work around:
  None
  Problem trigger:
  System running heavy I/O workload can hit this issue.
  Symptom:
  Kernel crash
  Platforms affected:
  x86_64-linux only
  Functional Area affected:
  ESS/GNR
  Customer Impact:
  Critical
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels