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Class @subclasses is not a WeakRef #11

dgtized opened this Issue May 29, 2009 · 3 comments


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dgtized commented May 29, 2009

Since @subclasses stores the list of classes that are inherited, the class definition will not be garbage collected due to being referenced in this list.


evanphx commented Mar 27, 2010

No todos in issues.


dgtized commented Mar 27, 2010

So the answer is that class definitions should never be garbage collected making this irrelevant, or that the issue was fixed through some other means?


evanphx commented Mar 27, 2010

I'm cleaning up old tickets. This seemed like a todo more than a bug. I'm removing the subclass list entirely right now, which fixes the problem.

dbussink added a commit that referenced this issue Jul 8, 2013

Guard memory allocations for JIT memory with spinlock
This fixes a crash issue where the JIT was running independent from the
GC and the GC was deallocating JIT memory at the same time. We don't
want to make the whole JIT generation GC dependent, since that causes
performance issues, so we guard all memory allocations here with a

The crash would be exposed with these backtraces where things were
modified concurrently:

Thread 6 (process 70553):
 #0  rubinius::jit::FreeRangeHeader::AddToFreeList () at /Users/dirkjan/Code/rubinius/vm/llvm/jit_memory_manager.hpp:151
 #1  0x000000010989f037 in rubinius::jit::MemoryRangeHeader::TrimAllocationToSize (this=0x10f7ec688, FreeList=0x10f7ec688, NewSize=5064) at vm/llvm/jit_memory_manager.cpp:211
 #2  0x000000010989bb75 in rubinius::jit::RubiniusRequestJITMemoryManager::endFunctionBody (this=<value temporarily unavailable, due to optimizations>, F=<value temporarily unavailable, due to optimizations>, FunctionStart=<value temporarily unavailable, due to optimizations>, FunctionEnd=0x13c8 <Address 0x13c8 out of bounds>) at jit_memory_manager.hpp:317
 #3  0x0000000109b4f852 in (anonymous namespace)::JITEmitter::finishFunction ()
 #4  0x0000000109946106 in (anonymous namespace)::Emitter<llvm::JITCodeEmitter>::runOnMachineFunction ()
 #5  0x0000000109bbbc30 in llvm::MachineFunctionPass::runOnFunction ()
 #6  0x0000000109f1beb2 in llvm::FPPassManager::runOnFunction ()
 #7  0x0000000109f1b9f9 in llvm::FunctionPassManagerImpl::run ()
 #8  0x0000000109f1b8a1 in llvm::FunctionPassManager::run ()
 #9  0x0000000109b461ab in llvm::JIT::runJITOnFunctionUnlocked ()
 #10 0x0000000109b46148 in llvm::JIT::runJITOnFunction ()
 #11 0x0000000109898fcc in rubinius::jit::Compiler::generate_function (this=0x10d485d38, indy=true) at vm/llvm/jit_compiler.cpp:118
 #12 0x00000001098ada93 in rubinius::BackgroundCompilerThread::perform (this=0x7fce81633240) at vm/llvm/state.cpp:345
 #13 0x00000001098ad4ef in rubinius::utilities::thread::Thread::delete_on_exit () at /Users/dirkjan/Code/rubinius/vm/util/thread.hpp:79
 #14 0x00000001098ad4ef in rubinius::utilities::thread::Thread::trampoline (arg=0x7fce81633240) at thread.hpp:211
 #15 0x00007fff8e73c7a2 in _pthread_start ()
 #16 0x00007fff8e7291e1 in thread_start ()

Thread 5 (process 70553):
 #0  0x00007fff952b5386 in __semwait_signal ()
 #1  0x00007fff8e7c6800 in nanosleep ()
 #2  0x00007fff8e7c668a in sleep ()
 #3  0x000000010969c9dd in rubinius::segv_handler (sig=11) at vm/environment.cpp:211
 #4  <signal handler called>
 #5  rubinius::jit::FreeRangeHeader::AddToFreeList () at /Users/dirkjan/Code/rubinius/vm/llvm/jit_memory_manager.hpp:151
 #6  0x000000010989ee53 in rubinius::jit::MemoryRangeHeader::FreeBlock (this=0x10f7c88f0, FreeList=<value temporarily unavailable, due to optimizations>) at jit_memory_manager.hpp:155
 #7  0x00000001098ac3e7 in rubinius::LLVMState::remove (this=<value temporarily unavailable, due to optimizations>, func=<value temporarily unavailable, due to optimizations>) at jit_memory_manager.hpp:426
 #8  0x000000010983dde9 in rubinius::CodeManager::sweep (this=0x7fce8180a2d8) at vm/gc/code_manager.cpp:107
 #9  0x0000000109750e7e in rubinius::ObjectMemory::mark () at /Users/dirkjan/Code/rubinius/vm/objectmemory.hpp:634
 #10 0x0000000109750e7e in rubinius::ObjectMemory::collect_mature_finish (this=0x7fce8180a200, state=0x10c94fec8, data=0x7fce8528b220) at vm/objectmemory.cpp:636
 #11 0x0000000109843d8a in rubinius::State::memory () at /Users/dirkjan/Code/rubinius/vm/state.hpp:171
 #12 0x0000000109843d8a in rubinius::ImmixMarker::perform (this=0x7fce8163a720, state=0x10c94fec8) at vm/gc/immix_marker.cpp:172
 #13 0x0000000109843b71 in rubinius::immix_marker_tramp (state=0x10f7ec688) at vm/gc/immix_marker.cpp:18
 #14 0x00000001098094c0 in rubinius::Thread::in_new_thread (ptr=0x7fce86a23e70) at vm/builtin/thread.cpp:250
 #15 0x00007fff8e73c7a2 in _pthread_start ()
 #16 0x00007fff8e7291e1 in thread_start ()

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