IOC assert by thread CAS-client

[LiangChih Chiang via Tech-talk <tech-talk at aps.anl.gov>]

Hello EPICS mates,

I run 9 IOCs on one server.

Their executables are of the same one, each IOC handles different devices.

Only one of them would have the "assert by thread CAS-client" problem.

It happens rarely, maybe once for two weeks.

This is my first time encountering the problem.

Not sure what to do even though have searched previous discussions in the forum.

The error message:

A call to 'assert(ev_que->evque[ev_que->putix] == EVENTQEMPTY)'
    by thread 'CAS-client' failed in ../db/dbEvent.c line 823.
Dumping a stack trace of thread 'CAS-client':
[    0x7fc4a3fb3d53]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libCom.so.3.21.0(epicsStackTrace+0x53)
[    0x7fc4a3fad0af]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libCom.so.3.21.0(epicsAssert+0x3f)
[    0x7fc4a44849ca]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libdbCore.so.3.21.0(db_queue_event_log+0x8a)
[    0x7fc4a4484c2d]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libdbCore.so.3.21.0(db_post_single_event+0x3d)
[    0x7fc4a44b01eb]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libdbCore.so.3.21.0(event_add_action+0x14b)
[    0x7fc4a44b0f58]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libdbCore.so.3.21.0(camessage+0x78)
[    0x7fc4a44ae1db]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libdbCore.so.3.21.0(camsgtask+0x16b)
[    0x7fc4a3fae193]: /blsw/47a/software/epics/7.0.6.1/base/lib/linux-x86_64/libCom.so.3.21.0(start_routine+0xb3)
[    0x7fc49e55217a]: /lib64/libpthread.so.0(start_thread+0xea)
[    0x7fc49e7a3d83]: /lib64/libc.so.6(clone+0x43)
EPICS Release EPICS R7.0.6.1.
Local time is 2026-09-13 01:46:57.314225866 CST
Please E-mail this message to the author or to tech-talk at aps.anl.gov
Calling epicsThreadSuspendSelf()
Thread CAS-client (0x7fc2300020d0) suspended