amavisd stops working every few days : reg_proc FAILED: register_proc: BDB N c_get: BDB0061 PANIC: Invalid argument, No such process

[Rebecca Cran]

I'm running amvisd-new 2.11.1 on FreeBSD 12.0, under postfix. Every so
often, sometimes every few days, sometimes every few weeks, amavisd dies
with:


Jun 17 03:45:39 muon amavis[17146]: (17146-08) (!!)TROUBLE in
check_mail: reg_proc FAILED: register_proc: BDB N c_get: BDB0061 PANIC:
Invalid argument, No such process. at (eval 93) line 222.
Jun 17 03:45:39 muon amavis[17146]: (17146-08) (!!)TROUBLE in
process_request: register_proc: BDB N db_cursor: BDB0060 PANIC: fatal
region error detected; run recovery, . at (eval 93) line 220.
Jun 17 03:45:39 muon amavis[17146]: (17146-08) (!)Requesting process
rundown after fatal error


How would I go about troubleshooting what's going wrong to cause it to fail?


-- 
Rebecca Cran