Bug #128308 for DBD-Firebird: DBD::Firebird Periodically Segfaults on shutdown.

I've been trying to chase down why the Sqitch Travis CI tests regularly hang when testing the Firebird engine. Doing some experimentation on my Mac, I've noticed that Perl segfaults every 2-6 runs. I turned on DBI tracing, and the last bit the DBI emits before the segfault is: fetch ends: ib_commit_transaction succeed. <- fetch= ( undef ) [1 items] row4 at t/lib/DBIEngineTest.pm line 1774 via at /Users/david/.plenv/versions/5.28.0/lib/perl5/site_perl/5.28.0/Test/Builder.pm line 339 Show quoted text
<> DESTROY(DBI::st=HASH(0x7ff89eae3388)) ignored for outer handle (inner DBI::st=HASH(0x7ff89eaf2ee8) has ref cnt 1) Show quoted text
-> DESTROY for DBD::Firebird::st (DBI::st=HASH(0x7ff89eaf2ee8)~INNER) dbd_st_destroy dbd_st_destroy: found in_sqlda.. dbd_st_destroy: freeing in_sqlda.. dbd_st_destroy: isc_dsql_free_statement succeeded. dbd_st_destroy: sth removed from linked list. <- DESTROY= ( undef ) [1 items] at t/lib/DBIEngineTest.pm line 1781 via at t/lib/DBIEngineTest.pm line 1781 DESTROY (dbih_clearcom) (sth 0x7ff89eaf2ee8, com 0x7ff89e5d9e10, imp DBD::Firebird::st): FLAGS 0x188011: COMSET Warn HandleError PrintWarn PARENT DBI::db=HASH(0x7ff8a13d9798) KIDS 0 (0 Active) NUM_OF_FIELDS 2 NUM_OF_PARAMS 1 dbih_clearcom 0x7ff89eaf2ee8 (com 0x7ff89e5d9e10, type 3) done. Show quoted text
<> DESTROY(DBI::db=HASH(0x7ff8a1a70348)) ignored for outer handle (inner DBI::db=HASH(0x7ff8a13d9798) has ref cnt 1) Show quoted text
-> DESTROY for DBD::Firebird::db (DBI::db=HASH(0x7ff8a13d9798)~INNER) dbd_db_disconnect dbd_db_destroy <- DESTROY= ( undef ) [1 items] at t/lib/DBIEngineTest.pm line 1781 via at t/lib/DBIEngineTest.pm line 1781 DESTROY (dbih_clearcom) (dbh 0x7ff8a13d9798, com 0x7ff8a0b1ef60, imp DBD::Firebird::db): FLAGS 0x188211: COMSET Warn HandleError PrintWarn AutoCommit PARENT DBI::dr=HASH(0x7ff8a1a670b8) KIDS 0 (0 Active) IMP_DATA HASH(0x7ff8a03dd2a8) dbih_clearcom 0x7ff8a13d9798 (com 0x7ff8a0b1ef60, type 2) done. The complete output is attached. Sqitch has no explicit call to disconnect, so it looks like the DBI is calling disconnect_all on exit. Could there be some kind of memory issue there? In case you want to try running the Sqitch tests, I'm using Docker to run Firebird: docker run --name fb --rm -it -d -e ISC_PASSWORD=nix -e FIREBIRD_DATABASE=test.db -p 3050:3050 jacobalberty/firebird:3.0 I've simply added DBI->trace(15) to t/firebird.t, and then run the tests directly via perl rather than prove: FIREBIRD_URI=db:firebird://sysdba:nix@0.0.0.0//firebird/data/test.db perl -I lib t/firebird.t 2>stderr.log I simply keep running them until I see zsh: segmentation fault FIREBIRD_URI=db:firebird://sysdba:nix@0.0.0.0//firebird/data/test.db perl -I