3033771 - ASE crashed after timeslice error stack trace holding engine local cache spinlock eresourcep->erprocelc_spin -- SAP ASE

• ASE crashed due to engine local cache (ELC) memory corruption
• Sequence of events in the ASE log shows 

1. ELC validation messages:
   
   ELC_VALIDATION_ERROR: Page address not aligned to memory page size. memptr = 0x2aac72412017, pelc = 0x2aaaae338078, chunksize = 1, engine id = 1, validate_flag = 1
   ELC_VALIDATION_CORRECTION: Backup page pointer 0x2aac72412000 was used. pelc = 0x2aaaae338078
   
   
2. Timeslice with stack containing functions VEH_Optimize() or sort()
   

   timeslice -501, current process infected at 0x224d007 (pausenonatomic+0x9)
   
   mem__pagesfree_this_engine
   
   <stack trace 1>
   kitermpro
   (null)
   mem__pagesfree_this_engine
   mem__pagesfree
   mem_freepages
   mem__free_this_phdr
   memfree
   sortclean
   startsort
   sort
   cri_ptn_index
   cri_physbuild
   cri_bldindex
   cri_main
   s_execute
   sequencer
   execproc
   s_execute
   sequencer
   tdsrecv_language
   conn_hdlr
   

   
   
   <stack trace 2>
   kitermproc
   (null)
   mem__pagesfree_this_engine
   mem__pagesfree+0x143()
   mem_freepages+0xc7()
   mem__free_this_phdr
   memfree
   release_compiler_scratch_space
   VEH_Optimize(void*)
   kisignal
   pausenonatomic
   mem__pagesfree_this_engine
   mem__pagesfree
   mem_freepages
   mem__free_this_phdr
   memfree
   release_compiler_scratch_space
   VEH_Optimize
   kisignal
   pausenonatomic+0x9()
   mem__pagesfree_this_engine
   mem__pagesfree
   mem_freepages
   mem__free_this_phdr
   memfree
   release_compiler_scratch_space+0x7c()
   pcstkwalk: No more space in buffer to hold stack frames
   
   
3. As the spid htting the timeslice is hloding a spinlock, ASE must go down
   

   Spinlocks held by kpid 218301711
   Spinlock eresourcep->erprocelc_spin at address 0x00002aaaad8e9600 owned by 218301711

   ueshutdown: exiting

• SAP Adaptive Server Enterprise (ASE) 16.0 SP03 
• SAP Adaptive Server Enterprise (ASE) 16.0 SP04

CR 824297, 824297, CR 823887, 823887, VEH_Optimize, sort, eresourcep->erprocelc_spin, vectored exception handler , mem__pagesfree , mem_freepages , mem__free_this_phdr memfree , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed