IJ44441: MMCHMGR CAUSES SIGNAL 11

APAR status

• Closed as program error.

Error description

• mmchmgr causes Signal 11.
  Stack may be similar to:
  
  [E] Signal 11 at location 0x55A58A966C2E in process
  13117, link reg 0xFFFFFFFFFFFFFFFF.
  
   [D] Traceback:
   [D] #0: 0x000055A58A966C2E
   Fileset::importRecord(FilesetMetadataRecord const*) +
   0x45E at ??:0
   [D] #1: 0x000055A58A9679DD
   FMFRecord::initMDObj(BaseFilesetMetadataRecord const*) +
   0xD at ??:0
   [D] #2: 0x000055A58A96D713
   FMFRecord::accessData(LkObj::LockModeEnum,
   BaseFilesetMetadataRecord const*, int) + 0x6D3 at ??:0
   [D] #3: 0x000055A58A96DCC7 getFMFRecord(StripeGroup*,
   unsigned int, unsigned int, LkObj::LockModeEnum,
   FMFRecord**, BaseFilesetMetadataRecor
  
   [D] #4: 0x000055A58A96EB29
   mtwRebuildFMFIndex::doOneStep(long long) + 0x239 at ??:0
   [D] #5: 0x000055A58A56DDA4 MultiThreadWork::doNextStep()
   + 0x104 at ??:0
   [D] #6: 0x000055A58A56E562 MultiThreadWork::doit(int,
   ThreadName, ThreadPoolName) + 0x492 at ??:0
   [D] #7: 0x000055A58A9691B7
   FilesetMetadata::rebuildIndex(FilesetPredicate*) + 0x147
   at ??:0
   [D] #8: 0x000055A58A9799CA getAllFilesets(StripeGroup*,
   LkObj::LockModeEnum, FilesetList*, unsigned int,
   FilesetPredicate*) + 0xFA at ??:0
   [D] #9: 0x000055A58A97BFB6
   SFSCompleteFilesetOps(clientCmdComm*, StripeGroup*) +
   0x186 at ??:0
   [D] #10: 0x000055A58ABAB254 SGMgrData::doAsyncRecovery()
   + 0x214 at ??:0
   [D] #11: 0x000055A58ABAB766
   StripeGroup::handleAsyncRecovery() + 0x16 at ??:0
   [D] #12: 0x000055A58AB962D4
   StripeGroupCfg::exceptionHandlerBody(void*) + 0x184 at
   ??:0
   [D] #13: 0x000055A58A5BCFA2 Thread::callBody(Thread*) +
   0x42 at ??:0
   [D] #14: 0x000055A58A5A9FC0
   Thread::callBodyWrapper(Thread*) + 0xA0 at ??:0
   [D] #15: 0x00007F413E54FEA5 start_thread + 0xC5 at ??:0
   [D] #16: 0x00007F413D43C96D __clone + 0x6D at ??:0
  
   Reported in 5.1.4.1
  

Local fix

Problem summary

• Segmentation fault (signal 11) happens on Fileset::importRecord
  function.
  Signal 11 happens on mmfsd process if there's one file
  system with original version <= 11.01 and it's upgraded
  to the latest one, resulting in mmfsd daemon crash and
  the file system becomes inaccessible.
  

Problem conclusion

• This problem is fixed in 5.1.6.1
  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
  
  Benefits of the solution:
  Avoid the mmfsd daemon crash as well as file
  system access issue.
  
  Work Around:
  None
  
  Problem trigger:
  Upgrade file system with original version <= 11.01
  to the latest version.
  
  Symptom:
  Abend/Crash
  
  Platforms affected:
  All Operating Systems
  
  Functional Area affected:
  All Scale Users
  
  Customer Impact:
  High Importance
  

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