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2760444 - Timeslice in atomic_try() during ALTER THREAD POOL results in Error 1794 forcing a reboot to clear - SAP ASE

Symptom

  • A timeslice error in the module atomic_try() is seen when increasing the number of engine threads using ALTER THREAD POOL:

timeslice -1501, current process infected at 0x16674f4 (atomic_try+0x2)

  • It is followed by a stack trace that contains functions:

ub__alloc
uballoc
kieng_allocproccache
kieng_proccache
dynengine_init
dynengine_create
ktCreateMuxThread
utp__CreateThread
utpSetPoolSize
threadpool__update
alter_threadpool
s_execute

  Note: A complete stack trace is available under Attachments.

  • A subsequent attempt to run ALTER THREAD POOL fails with Error 1794:

The previous 'alter thread pool syb_default_pool' command is still in progress, hence the current command is aborted. Please try again !


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Environment

  • SAP Adaptive Server Enterprise (ASE) 15.7
  • SAP Adaptive Server Enterprise (ASE) 16.0

Product

SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0

Keywords

CR818545, CR#818545, 818545, timeslice, error 1794, engine thrashing, procedure cache , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed

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