IJ17471: KERNEL BUG AT LOCKS.C:34

APAR status

• Closed as program error.

Error description

• Problem description:
  Advisory locks are recorded in the Linux kernel on the local
  node via file_lock structures, and GPFS maintains an additional
  structureto accomplish locking across nodes. There are times
  when inode objectwas freed, companied with a blocked lock waiter
  is resumed by GPFS,GPFS will try to free the file_lock along
  with the GPFS structure, andaccess the obselete inode structure
  data, which causes kernel crash.
  
  Benefits of the solution:
  Avoid the kernel crash in the large fcntl locking workload
  
  On disk format affected by fix:
  No
  
  Work around:
  None
  
  Problem trigger:
  A large fcntl locking workload and lock contention.
  
  Symptom:
  Abend/Crash
  
  Platforms affected:
  ALL Linux OS environments
  
  Functional Area affected:
  All Scale Users
  
  Customer Impact:
  High Importance
  

Local fix

• N/A
  

Problem summary

• Advisory locks are recorded in the Linux kernel on the local
  node
  via file_lock structures, and GPFS maintains an additional
  structure
  to accomplish locking across nodes. There are times when inode
  object
  was freed, companied with a blocked lock waiter is resumed by
  GPFS,
  GPFS will try to free the file_lock along with the GPFS
  structure, and
  access the obselete inode structure data, which causes kernel
  crash.
  

Problem conclusion

• Avoid the kernel crash in the large fcntl locking workload
  

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