The cause of the error is specified more precisely in v5.11.4-24-g1549364*, yet the location is even more hidden: 

$ ./perl -Ilib -Tde 1
Insecure dependency in require while running with -T switch at lib/per
+l5db.pl line 1417.
Compilation failed in require.
 at -e line 0
        main::BEGIN() called at lib/perl5db.pl line 0
        eval {...} called at lib/perl5db.pl line 0
BEGIN failed--compilation aborted.
 at -e line 0
Debugged program terminated.  Use q to quit or R to restart,
  use o inhibit_exit to avoid stopping after program termination,
  h q, h R or h o to get additional info.
  DB<1> q

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Is the problem that Carp isn't taint safe? That's not good. How about you submit a bug report?

In reply to Re: Cryptic failure of perldb under -T by ikegami
in thread Cryptic failure of perldb under -T by tlm

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