What does the audit say around the time of the crash?
What does /var/log/daemond.log say at the time of the crash?
What does /var/log/maillog say at the time of the crash?
Are there any core files in /var/run/sendmail/?
I have had one ticket myself with Sendmail crashing at v8. That issue has been fixed with a patch and verified. I tried looking for your ticket based on your name but I couldn't find it (I wanted to see if you were running into the same issue).
The audit says:
Information -9|Bad file descriptorget_burb_for_socket failed on SOURCE_BURB (-1)
acld_build_query() error: Error getting socket data.
Maillog show socket errors.
There are 3 files
We have had no word of a potential patch so far. It would be great if you were able to help with this. Our ticket is 3-1539484468