[LLVMbugs] [Bug 22272] New: Deadlock on ctrl-c

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22272

            Bug ID: 22272
           Summary: Deadlock on ctrl-c
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I noticed that llvm-tblgen sometimes deadlocks if it gets a SIGINT. This time I
managed to get a backtrace. The problem is that we try to allocate memory from
a signal handler:

#0  0x00007fc20c6952ac in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x00007fc20c60a8bc in malloc () from /lib64/libc.so.6
#2  0x00007fc20cec2608 in operator new(unsigned long) () from
/lib64/libstdc++.so.6
#3  0x00007fc20d37e134 in void*
llvm::object_creator<llvm::sys::SmartMutex<true> >() () from
/home/espindola/llvm/build/bin/../lib/libLLVMSupport.so
#4  0x00007fc20d378725 in llvm::ManagedStaticBase::RegisterManagedStatic(void*
(*)(), void (*)(void*)) const () from
/home/espindola/llvm/build/bin/../lib/libLLVMSupport.so
#5  0x00007fc20d37dd4a in llvm::ManagedStatic<llvm::sys::SmartMutex<true>
>::operator*() () from /home/espindola/llvm/build/bin/../lib/libLLVMSupport.so
#6  0x00007fc20d3ec5bc in SignalHandler(int) () from
/home/espindola/llvm/build/bin/../lib/libLLVMSupport.so
#7  <signal handler called>
#8  0x00007fc20c60b180 in free () from /lib64/libc.so.6
#9  0x00007fc20d1cdef0 in llvm::SmallVectorImpl<unsigned
int>::~SmallVectorImpl() () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#10 0x00007fc20d1cde85 in llvm::SmallVector<unsigned int, 32u>::~SmallVector()
() from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#11 0x00007fc20d1a7f15 in llvm::FoldingSetNodeID::~FoldingSetNodeID() () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#12 0x00007fc20d1a57bf in llvm::BitsInit::get(llvm::ArrayRef<llvm::Init*>) ()
from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#13 0x00007fc20d1a8668 in llvm::BitsInit::resolveReferences(llvm::Record&,
llvm::RecordVal const*) const () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#14 0x00007fc20d1b0fcf in llvm::Record::resolveReferencesTo(llvm::RecordVal
const*) () from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#15 0x00007fc20d1ecb60 in
llvm::TGParser::ResolveMulticlassDefArgs(llvm::MultiClass&, llvm::Record*,
llvm::SMLoc, llvm::SMLoc, std::vector<llvm::Init*, std::allocator<llvm::Init*>
> const&, std::vector<llvm::Init*, std::allocator<llvm::Init*> >&, bool) ()
from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#16 0x00007fc20d1ed4f6 in llvm::TGParser::ParseDefm(llvm::MultiClass*) () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#17 0x00007fc20d1eabe2 in llvm::TGParser::ParseObject(llvm::MultiClass*) ()
from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#18 0x00007fc20d1eac92 in llvm::TGParser::ParseObjectList(llvm::MultiClass*) ()
from /home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#19 0x00007fc20d1edba9 in llvm::TGParser::ParseFile() () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#20 0x00007fc20d19c9f0 in llvm::TableGenMain(char*, bool
(*)(llvm::raw_ostream&, llvm::RecordKeeper&)) () from
/home/espindola/llvm/build/bin/../lib/libLLVMTableGen.so
#21 0x00000000005ef8fe in main ()

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