[LLVMdev] [NVPTX] Strange assertion around BlockToChain.clear(); in Release+Asserts build

[Dmitry N. Mikushin]

Dear NVPTX community,

I've create a bug http://llvm.org/bugs/show_bug.cgi?id=13521 with
reprocase for this issue.

Please, help us to fix it. Last 1,5 months we regularly encounter &
workaround or fix 1-2 bugs per week in NVPTX backend. This is
definitely not the amount of work we can completely serve ourselves...
We would really really appreciate some collaboration.

Thanks,
- D.

2012/8/3 Dmitry N. Mikushin <maemarcus at gmail.com>:
> Hi,
>
> After building out project in release mode, caught an assertion, which
> we have not seen before:
>
> hello_f: /tmp/rpmbuild_debug/BUILD/llvm/build/include/llvm/ADT/DenseMap.h:126:
> void llvm::DenseMap<KeyT, ValueT, KeyInfoT>::clear() [with KeyT =
> llvm::MachineBasicBlock*, ValueT = <unnamed>::BlockChain*, KeyInfoT =
> llvm::DenseMapInfo<llvm::MachineBasicBlock*>]: Assertion `NumEntries
> == 0 && "Node count imbalance!"' failed.
>
> Program received signal SIGABRT, Aborted.
> 0x00007ffff785c945 in raise () from /lib64/libc.so.6
> (gdb) bt
> #0  0x00007ffff785c945 in raise () from /lib64/libc.so.6
> #1  0x00007ffff785df21 in abort () from /lib64/libc.so.6
> #2  0x00007ffff7855810 in __assert_fail () from /lib64/libc.so.6
> #3  0x00007ffff62b283d in (anonymous
> namespace)::MachineBlockPlacement::runOnMachineFunction(llvm::MachineFunction&)
> () from /opt/kernelgen/lib/libLLVM-3.2svn.so
> #4  0x00007ffff64cfb9f in
> llvm::FPPassManager::runOnFunction(llvm::Function&) () from
> /opt/kernelgen/lib/libLLVM-3.2svn.so
> #5  0x00007ffff64cfc43 in
> llvm::FPPassManager::runOnModule(llvm::Module&) () from
> /opt/kernelgen/lib/libLLVM-3.2svn.so
> #6  0x00007ffff64cf6e4 in
> llvm::MPPassManager::runOnModule(llvm::Module&) () from
> /opt/kernelgen/lib/libLLVM-3.2svn.so
> #7  0x00007ffff64cf840 in llvm::PassManagerImpl::run(llvm::Module&) ()
> from /opt/kernelgen/lib/libLLVM-3.2svn.so
> #8  0x00007ffff75aa57a in TrackedPassManager::run
> (this=0x7fffffffc8d0, M=...) at ../bugpoint/TrackedPassManager.h:168
> #9  0x00007ffff75a66bf in kernelgen::runtime::codegen (runmode=1,
> kernel=0x7fffffffd420, m=0x833ab0) at codegen.cpp:454
> #10 0x00007ffff75871b1 in main (argc=1, argv=0x7fffffffdcc8,
> envp=0x7fffffffdcd8) at entry.cpp:318
> #11 0x00007ffff7848bc6 in __libc_start_main () from /lib64/libc.so.6
> #12 0x00000000004008f9 in _start () at ../sysdeps/x86_64/elf/start.S:113
>
> Any ideas?.. What could it be related to?
>
> Thanks,
> - D.