backtrace.txt

Operation 'bind_key' cannot obtain write lock for VMHash; error code=-16
   at NQP::src/HLL/Compiler.nqp:754  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:linefileof)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1479  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:compile_annotation)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1439  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:compile_node)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:696  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:as_mast)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1518  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:compile_all_the_stmts
)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1081  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1059  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:1006  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:compile_node)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:700  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:as_mast)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:845  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:compile_node)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:700  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:as_mast)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:420  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:to_mast)
 from NQP::src/vm/moar/QAST/QASTCompilerMAST.nqp:2217  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/QAST.moarvm:to_mast)
 from NQP::src/vm/moar/HLL/Backend.nqp:790  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:mast)
 from NQP::src/HLL/Compiler.nqp:462  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:execute_stage)
 from NQP::src/HLL/Compiler.nqp:501  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:run)
 from NQP::src/HLL/Compiler.nqp:504  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:)
 from NQP::src/HLL/Compiler.nqp:496  (/home/vrurg/src/Raku/rakudo/install/share/nqp/lib/NQPHLL.moarvm:compile)
 from SETTING::src/core.c/ForeignCode.rakumod:105  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/ForeignCode.rakumod:61  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.c.setting.moarvm:EVAL)
 from SETTING::src/core.c/CompUnit/PrecompilationDependency/File.rakumod:37  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.
c.setting.moarvm:)
 from SETTING::src/core.c/CompUnit/PrecompilationDependency/File.rakumod:25  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.
c.setting.moarvm:spec)
 from SETTING::src/core.c/CompUnit/PrecompilationRepository.rakumod:186  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.c.se
tting.moarvm:)
 from SETTING::src/core.c/CompUnit/PrecompilationRepository.rakumod:183  (/home/vrurg/src/Raku/rakudo/install/share/perl6/runtime/CORE.c.se
tting.moarvm:)

This is an outcome of an attempt to parallelize loading of modules with hash protection turned on. I don't have time to get deeper into this, but hope it helps.

I can't see anything doing something with a hash there, except handling of named arguments.

Which would maybe imply that closure taking is not threadsafe ??

I can't tell without additional analysis. The involvement of nameds is nearly unquestionable.

Wether it's closures or something different is yet to be found out. But if you're right (and that's likely) then our problems here are worse than I'd like them to be. Otherwise it means that RakuAST is likely to be free of the problem as it doesn't use HLL::Compiler.

RakuAST is likely to be free of the problem as it doesn't use HLL::Compiler.

Sadly, this is not true.

% rak HLL::Compiler src/Raku 
src/Raku/Grammar.nqp
421:HLL::Compiler.lineof($B.orig(), $B.from(), :cache(1))
584:line => HLL::Compiler.lineof($cursor.orig, $cursor.pos, :cache(1)),
644::line-real(HLL::Compiler.lineof(self.orig(), self.from(), :cache(1)))
2193:line   => HLL::Compiler.lineof($/.orig, $/.from, :cache(1))
2208:line   => HLL::Compiler.lineof($/.orig, $/.from, :cache(1))
2223:line   => HLL::Compiler.lineof($/.orig, $/.from, :cache(1))

src/Raku/ast/origins.rakumod
43:#      backend compilation code. It currently relies upon HLL::Compiler.linefileof() method which might be unreliable.

Having said that, we can probably get rid of it.

Oh, no! That's exactly why I have developed ast/origins.rakumod back then!