Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> On 2019-Nov-04, Marcel Ruff wrote:
>> Now I have upgraded to postgresql 12 and get a crash about once per day,
>> ...
>> How can I track down the problem?
> The first you need to do is obtain a crash dump. This page may help:
> https://wiki.postgresql.org/wiki/Getting_a_stack_trace_of_a_running_PostgreSQL_backend_on_Linux/BSD#Getting_a_trace_from_a_reproducibly_crashing_backend
Also, as long as you're building from source anyway, you might pull down
v12 branch tip from our git repo, or use a nightly snapshot tarball [1]
to see if the problem's already fixed.
regards, tom lane
[1] https://www.postgresql.org/ftp/snapshot/12/