Re: checkpointer: PANIC: could not fsync file: No such file ordirectory

I looked and found a new "hint".

On Tue, Nov 19, 2019 at 05:57:59AM -0600, Justin Pryzby wrote:
> < 2019-11-15 22:16:07.098 EST  >PANIC:  could not fsync file "base/16491/1731839470.2": No such file or directory
> < 2019-11-15 22:16:08.751 EST  >LOG:  checkpointer process (PID 27388) was terminated by signal 6: Aborted

An earlier segment of that relation had been opened successfully and was 
*still* opened:

$ sudo grep 1731839470 /var/spool/abrt/ccpp-2019-11-15-22:16:08-27388/open_fds 
63:/var/lib/pgsql/12/data/base/16491/1731839470

For context:

$ sudo grep / /var/spool/abrt/ccpp-2019-11-15-22:16:08-27388/open_fds |tail -3
61:/var/lib/pgsql/12/data/base/16491/1757077748
62:/var/lib/pgsql/12/data/base/16491/1756223121.2
63:/var/lib/pgsql/12/data/base/16491/1731839470

So this may be an issue only with relations>segment (but, that interpretation 
could also be very naive).