Experimental Physics and
Industrial Control System

Andrew Johnson via Core-talk <[email protected]> · Fri, 01 Nov 2019 20:20:48 -0000

** Changed in: epics-base/3.16
       Status: Fix Committed => Fix Released

** Changed in: epics-base/3.15
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1730982

Title:
  Race in db_close_events()

Status in EPICS Base:
  Fix Released
Status in EPICS Base 3.14 series:
  Won't Fix
Status in EPICS Base 3.15 series:
  Fix Released
Status in EPICS Base 3.16 series:
  Fix Released
Status in EPICS Base 7.0 series:
  Fix Released

Bug description:
  valgrind reports a data race in db_close_events().  This is the
  pattern of:

  > epicsEventMustWait(...)
  > epicsEventDestroy(...)

  Where the working calling 'epicsEventSignal(...)' may not have
  returned before the event is destroy'd.

  I introduced this race in d2b0e920012d4c9bc0eaecc0e092cedd776db578
  prior to 3.15.0.1 to fix a similar race (the worker was calling
  epicsEventDestroy() ).

  We need a safe pattern for joining worker threads (cf. lp:1699229).

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System