id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,lang,patch,platform 1420,Failed assertion when running 240th test in 01-regex.t in GGE,masak,,"Following these steps I can create Parrot to abort abnormally. {{{ $ git clone git://github.com/masak/gge.git $ cd gge $ git checkout ed12aa $ export PERL6LIB=`pwd`/lib $ perl6 Configure $ make $ perl6 t/perl6regex/01-regex.t }}} Here's the stacktrace I get. {{{ [snip] ok 238 - [metachars:238] digit ok 239 - [metachars:239] digit src/gc/api.c:245: failed assertion 'PObj_is_PMC_TEST(obj)' Backtrace - Obtained 32 stack frames (max trace depth is 32). 0 libparrot.dylib 0x0000000100af4e03 Parrot_print_backtrace + 35 1 libparrot.dylib 0x0000000100af4f37 Parrot_confess + 135 2 libparrot.dylib 0x0000000100b0472f Parrot_gc_mark_PMC_alive_fun + 127 3 libparrot.dylib 0x0000000100cd6f73 Parrot_Object_mark + 115 4 libparrot.dylib 0x0000000100b08b9d mark_special + 477 5 libparrot.dylib 0x0000000100b0658a Parrot_gc_mark_PObj_alive + 186 6 libparrot.dylib 0x0000000100b09620 trace_mem_block + 320 7 libparrot.dylib 0x0000000100b096e7 trace_system_stack + 119 8 libparrot.dylib 0x0000000100b0975a trace_system_areas + 106 9 libparrot.dylib 0x0000000100b08ff5 Parrot_gc_trace_root + 1109 10 libparrot.dylib 0x0000000100b06ee2 gc_ms_trace_active_PMCs + 66 11 libparrot.dylib 0x0000000100b07190 gc_ms_mark_and_sweep + 288 12 libparrot.dylib 0x0000000100b044ad Parrot_gc_mark_and_sweep + 77 13 libparrot.dylib 0x0000000100c321cd mem_allocate + 205 14 libparrot.dylib 0x0000000100b05a75 Parrot_gc_allocate_string_storage + 213 15 libparrot.dylib 0x0000000100a599e8 Parrot_str_new_init + 328 16 libparrot.dylib 0x0000000100a5a53d Parrot_str_new + 173 17 perl6_ops.bundle 0x00000001015e6288 Parrot_transform_to_p6opaque_p + 104 18 libparrot.dylib 0x0000000100b71694 runops_fast_core + 180 19 libparrot.dylib 0x0000000100b7019c runops_int + 252 20 libparrot.dylib 0x0000000100b19e32 runops + 370 21 libparrot.dylib 0x0000000100b0f7ae Parrot_pcc_invoke_from_sig_object + 430 22 libparrot.dylib 0x0000000100b0f962 Parrot_pcc_invoke_sub_from_c_args + 386 23 libparrot.dylib 0x0000000100b699be run_sub + 254 24 libparrot.dylib 0x0000000100b69cdb do_1_sub_pragma + 763 25 libparrot.dylib 0x0000000100b69ebd do_sub_pragmas + 445 26 libparrot.dylib 0x0000000100b69fbc PackFile_fixup_subs + 124 27 libparrot.dylib 0x0000000100d282fa imcc_compile + 1386 28 libparrot.dylib 0x0000000100d283c5 imcc_compile_pir_ex + 149 29 libparrot.dylib 0x0000000100b5d3ab pcf_P_Jt + 203 30 libparrot.dylib 0x0000000100c5dda8 Parrot_NCI_invoke + 296 31 libparrot.dylib 0x0000000100a73100 Parrot_invokecc_p + 144 Abort trap }}} I wouldn't be surprised if exact Rakudo/Parrot versions and platforms play into this bug. I'm running Rakudo 4add64 on Parrot r43600. I'm on Mac OS X 10.6.2. I have 4 GB of RAM. The assertion failure cannot be triggered simply by running test 240 in 01-regex.t. This is consistent with the observation that it seems to occur during a GC run. Running all of the 239 tests takes... a while; sorry about that. On the upside, the assertion failure seems very reliable. The steps 'perl6 Configure' and 'make' are also necessary for the effect to occur. I tried without them, and then test 240 runs fine.",bug,closed,normal,,GC,2.0.0,fatal,fixed,"fail, crash, assertion, stacktrace",,perl6,applied,mac