From @moritz

Rakudo 3d6536797861db887cdb4479610e10415e343628 on parrot r41410​:

This program segfaults​:

try {
  die 'foo';
  CATCH {
  say $!.WHAT
  }
}

Stack trace​:

(gdb) run foo.pl
Starting program​: /scratch/mlenz/rakudo/perl6 foo.pl
[Thread debugging using libthread_db enabled]
warning​: Lowest section in /usr/lib/libicudata.so.38 is .hash at
000000000000012
0
[New Thread 0x7fe894fef6f0 (LWP 19268)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fe894fef6f0 (LWP 19268)]
Parrot_FixedPMCArray_visit (interp=0x24e2010, pmc=0x7fe8907668a0,
  info=0x7fff9d01d5d0) at ./src/pmc/fixedpmcarray.pmc​:734
734 (info->visit_pmc_now)(INTERP, *pos, info);
(gdb) bt
#​0 Parrot_FixedPMCArray_visit (interp=0x24e2010, pmc=0x7fe8907668a0,
  info=0x7fff9d01d5d0) at ./src/pmc/fixedpmcarray.pmc​:734
#​1 0x00007fe894a66ee3 in visit_loop_todo_list (interp=0x24e2010,
  current=0x7fe8907668a0, info=0x7fff9d01d5d0) at src/pmc_freeze.c​:1099
#​2 0x00007fe894a6716f in Parrot_freeze (interp=0x24e2010,
pmc=0x7fe88dfd0980)
  at src/pmc_freeze.c​:1277
#​3 0x00007fe894abeb79 in Parrot_default_clone (interp=0x24e2010,
  pmc=0x7fe8907d83c0) at ./src/pmc/default.pmc​:1086
#​4 0x00007fe894a603cf in Parrot_oo_clone_object (interp=0x24e2010,
  pmc=<value optimized out>, class_=<value optimized out>,
  dest=<value optimized out>) at src/oo.c​:303
#​5 0x00007fe8949ddfdb in Parrot_clone_p_p (cur_opcode=0x7fe891cb8a60,
  interp=0x24e2010) at src/ops/set.ops​:474
#​6 0x00007fe894a6978f in runops_slow_core (interp=0x24e2010,
  runcore=<value optimized out>, pc=0x7fe891cb8a60)
  at src/runcore/cores.c​:843
#​7 0x00007fe894a68741 in runops_int (interp=0x24e2010, offset=342590)
  at src/runcore/main.c​:549
#​8 0x00007fe894a3b621 in runops (interp=0x24e2010, offs=<value
optimized out>)
  at src/call/ops.c​:119
#​9 0x00007fe894a3b7d1 in runops_args (interp=0x24e2010,
sub=0x7fe88faa7400,
  obj=<value optimized out>, meth_unused=<value optimized out>,
  sig=0x7fe894b787fb "vP", ap=0x7fff9d01d7e0) at src/call/ops.c​:269
---Type <return> to continue, or q <return> to quit---
#​10 0x00007fe894a3bf68 in Parrot_runops_fromc_args (interp=0x24e2010,
  sub=0x7fe8907d83c0, sig=0x7fe894b787fb "vP") at src/call/ops.c​:338
#​11 0x0000000000400d5b in main (argc=2, argv=0x7fff9d01d9d8) at
perl6.c​:244536

From @moritz

Tested in t/spec/integration/weird-errors.t, does not segfault anymore.

@moritz - Status changed from 'new' to 'resolved'