Re: BUG #17725: Sefault when seg_in() called with a large argument

Hi John,

On Tue, 20 Dec 2022 at 20:44, John Naylor <john.naylor@enterprisedb.com> wrote:
> Neither query shows the reported problem in my environment on master (as of today) or v14, so not sure
> It's possibly relevant that this result is different from the "3.100000e+01" which was shown in your backtrace. Since
afew details of this report don't agree with each other, I'm starting to wonder if some other relevant details got lost
alongthe way.
 

Thanks for taking a look and you're possibly correct.

After trying a few combinations, I see that passing
CFLAGS="-Wuninitialized" (default for my test setup) causes this failure.
Removing the flag gives the error you mention, and possibly why this
may not be easy to reproduce on a production system (unsure).

$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0

# How I trigger compilation
cd ${sourcepth} && git clean -xdf && ./configure
CFLAGS="-Wuninitialized" --prefix=${installpth} && make -j`nproc`
install ...

This is a recent crash on 69f75bf825@REL_12_STABLE

2022-12-20 10:24:53.361 UTC [3087004] LOG:  server process (PID
3182365) was terminated by signal 11: Segmentation fault
2022-12-20 10:24:53.361 UTC [3087004] DETAIL:  Failed process was
running: SELECT seg_in(numeric_out(round(31, 10000)));
2022-12-20 10:24:53.361 UTC [3087004] LOG:  terminating any other
active server processes
2022-12-20 10:24:53.366 UTC [3087004] LOG:  all server processes
terminated; reinitializing

I created this bug-report since I am able to reproduce this at will. But let
me know if this is uninteresting, or if I can provide any other detail to
help in triaging.

-
robins