We have several instances of a sequencer that occasionally start getting messages such as this, every 10 seconds or so:
sevr=fatal pvGet(ss sscanner, var PVL[23], pv SR08U___GDS1HS_BC03): failed (timeout waiting for other get requests to finish)
examining that channel with seqChanShow shows:
#84 of 99:
Variable name: "PVL[23]"
type = long
count = 1
Value = 0
Assigned to "SR08U___GDS1HS_BC03"
Connected
Not monitored
Not sync'ed
Status = 10
Severity = 2
Message = get completion timeout
Time stamp = 2013-06-08 22:00:24.857905
Next? (+/- skip count)
Looking at the code in seq_ca.c and seq_if.c, it seems that if a synchronous pvGet ever fails to get a callback from channel access, the "get completion timeout" message is set in the channel metadata and all subsequent attempts to do pvGets on that channel will fail as in the first message. The latter occurs because there is a get semaphore for each channel that the callback is supposed to give.