Experimental Physics and
Industrial Control System

Martin Konrad via Core-talk <[email protected]> · Mon, 06 Jan 2020 23:02:21 -0000

MR: https://code.launchpad.net/~info-martin-konrad/epics-base/+git
/epics-base/+merge/375559

** Changed in: epics-base
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1829919

Title:
  IOC segfaults when calling dbLoadRecords after iocInit

Status in EPICS Base:
  In Progress

Bug description:
  Diego Omitto reported the following issue:

  I know that we are not supposed to load records after the iocInit but
  I think it should not segFault.

  $cat dummy.db
  record(ai,"dummy"){}

  $ softIoc
  epics> iocInit
  Starting iocInit
  ############################################################################
  ## EPICS R3.15.6-1+frib3+0~20190507132128.11+debian09~1.gbp4c10ca
  ## EPICS Base built May  7 2019
  ############################################################################
  cas warning: Configured TCP port was unavailable.
  cas warning: Using dynamically assigned TCP port 39385,
  cas warning: but now two or more servers share the same UDP port.
  cas warning: Depending on your IP kernel this server may not be
  cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)
  iocRun: All initialization complete
  epics> dbLoadRecords("dummy.db")
  epics> #caget dummy from another terminal
  epics> Segmentation fault

  $ gdb /usr/lib/epics/bin/linux-x86_64-debug/softIoc
  GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
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  and "show warranty" for details.
  This GDB was configured as "x86_64-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>.
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  Reading symbols from /usr/lib/epics/bin/linux-x86_64-debug/softIoc...done.
  (gdb) r
  Starting program: /usr/lib/epics/bin/linux-x86_64-debug/softIoc
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7ffff5d51700 (LWP 6677)]
  [Thread 0x7ffff5d51700 (LWP 6677) exited]
  epics> iocInit
  [New Thread 0x7ffff5550700 (LWP 6687)]
  Starting iocInit
  ############################################################################
  ## EPICS R3.15.6-1+frib3+0~20190507132128.11+debian09~1.gbp4c10ca
  ## EPICS Base built May  7 2019
  ############################################################################
  [New Thread 0x7ffff54cf700 (LWP 6688)]
  [New Thread 0x7ffff544e700 (LWP 6689)]
  [New Thread 0x7ffff5d51700 (LWP 6690)]
  [New Thread 0x7ffff534d700 (LWP 6691)]
  [New Thread 0x7ffff514c700 (LWP 6692)]
  [New Thread 0x7ffff4f4b700 (LWP 6693)]
  [New Thread 0x7ffff4d4a700 (LWP 6694)]
  [New Thread 0x7ffff4b49700 (LWP 6695)]
  [New Thread 0x7ffff4948700 (LWP 6696)]
  [New Thread 0x7ffff4747700 (LWP 6697)]
  [New Thread 0x7ffff4546700 (LWP 6698)]
  [New Thread 0x7ffff4345700 (LWP 6699)]
  [New Thread 0x7fffc7fff700 (LWP 6700)]
  [New Thread 0x7fffc7dfe700 (LWP 6701)]
  [New Thread 0x7ffff4144700 (LWP 6702)]
  [New Thread 0x7fffc7bfd700 (LWP 6703)]
  [New Thread 0x7fffc7afc700 (LWP 6704)]
  iocRun: All initialization complete
  epics> dbLoadRecords("dummy.db")
  epics> dbgf dummy
  dbgf only works after iocInit
  epics> [New Thread 0x7fffc7a7b700 (LWP 6913)]
  [New Thread 0x7fffc797a700 (LWP 6914)]

  Thread 22 "CAS-client" received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7fffc797a700 (LWP 6914)]
  dbScanLock (precord=0x5555558525f0) at ../../../src/ioc/db/dbLock.c:249
  249    ../../../src/ioc/db/dbLock.c: No such file or directory.
  (gdb) bt
  #0  dbScanLock (precord=0x5555558525f0) at ../../../src/ioc/db/dbLock.c:249
  #1  0x00007ffff7946464 in dbChannel_get_count (chan=chan@entry=0x7fffac004cb8, buffer_type=20,
      pbuffer=0x7ffff403f020, nRequest=nRequest@entry=0x7fffc7979cc0, pfl=pfl@entry=0x0)
      at ../../../src/ioc/db/db_access.c:157
  #2  0x00007ffff796d29a in read_reply (pfl=0x0, eventsRemaining=1, dbch=0x7fffac004cb8, pArg=0x7fffc7979cd0)
      at ../../../src/ioc/rsrv/camessage.c:587
  #3  read_notify_action (mp=<optimized out>, pPayload=<optimized out>, client=<optimized out>)
      at ../../../src/ioc/rsrv/camessage.c:804
  #4  0x00007ffff796e08f in camessage (client=client@entry=0x7fffb0000f50) at ../../../src/ioc/rsrv/camessage.c:2640
  #5  0x00007ffff796a981 in camsgtask (pParm=0x7fffb0000f50) at ../../../src/ioc/rsrv/camsgtask.c:117
  #6  0x00007ffff76db410 in start_routine (arg=0x7fffbc0056c0) at ../../../src/libCom/osi/os/posix/osdThread.c:403
  #7  0x00007ffff6b754a4 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
  #8  0x00007ffff73e0d0f in clone () from /lib/x86_64-linux-gnu/libc.so.6
  (gdb)

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System