hi
During installation from source code, there are many crashes for psql while executing core regression tests, all the crashes are similar, the backtrace info as follows: Core was generated by 'psql'. Program terminated with signal 11, Segmentation fault. # 0 0x000000000043f140 in slash_yylex() (gdb) bt #0 0x000000000043f140 in slash_yylex() #1 0x00000000004430fc in psql_scan_slash_command() #2 0x000000000043f140 in HandleSlashCmds() #3 0x000000000043f140 in MainLoop() #4 0x000000000043f140 in main() I did more compared testing about this scenario, as follows: 1. install from local source code(xxx.tar.gz) 1) switch to source tree directory, and build there ---- no crash generated 2) create a build directory, and build there ---- no crash generated 2. install from git source code 1) switch to source tree directory, and build there ---- no crash generated 2) create a build directory, and build there ---- many crashes generated, but if install newer version of flex, e.g. 2.6.4, the problem doesn't exist. Any suggestions about this behavior? NOTES: test commands are same, as follows: configure --enable-coverage --enable-tap-tests make make check testing environment: PostgreSQL: 13.2 redhat 7.4, 3.10.0-693.e17.x86_64 flex: 2.5.37 thanks walker
