Re: Use of signal-unsafe functions from signal handlers

Julien Rouhaud <rjuju123(at)gmail(dot)com> writes:
> Yes, but it's using ereport with FATAL level, so if it's the top level message
> the ErrorContext should be in initial state or have been reset previously, and
> if it's not then the escape hatch will reset the context. So in any case there
> will be a guarantee to have at least 8kB available in that context, that any
> palloc will be able to use to format the message.

ereport() itself is just the tip of the iceberg; even if it's safe
(which I concur it isn't), there's also the atexit/on_proc_exit
functions that are likely to be called during shutdown. So yeah,
this coding is not too safe. I'm not sure that getting rid of it
would be a net win though, as we'd replace it-might-crash hazards
with it-might-never-exit hazards, from bgworkers that neglect to
respond to ShutdownRequestPending.

regards, tom lane