[lldb-dev] lldb-mi allocating memory inside of signal handlers

[Vince Harron]

Hi all,

I noticed these thread sanitizer warnings while running lldb-mi tests on
Linux.

WARNING: ThreadSanitizer: signal-unsafe call inside of a signal (pid=39721)

    #0 operator new(unsigned long) <null>:0 (lldb-mi-3.7.0+0x000000092b9d)

    #1 std::string::_Rep::_S_create(unsigned long, unsigned long,
std::allocator<char> const&) <null>:0 (libstdc++.so.6+0x0000000ba3b8)

    #2 CMICmnResources::GetStringFromResource(unsigned int, CMIUtilString&)
const
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MICmnResources.cpp:434
(lldb-mi-3.7.0+0x00000014ddd8)

    #3 CMICmnResources::GetString(unsigned int) const
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MICmnResources.cpp:371
(lldb-mi-3.7.0+0x00000014db81)

    #4 sigwinch_handler(int)
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriverMain.cpp:99
(lldb-mi-3.7.0+0x0000001589ff)

    #5 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool, int,
my_siginfo_t*, void*) tsan_interceptors.o:0 (lldb-mi-3.7.0+0x00000009f25f)

    #6 void std::this_thread::sleep_for<long, std::ratio<1l, 1000l>
>(std::chrono::duration<long, std::ratio<1l, 1000l> > const&)
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/thread:279
(lldb-mi-3.7.0+0x00000013243e)

    #7 CMIDriver::ReadStdinLineQueue()
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriver.cpp:710
(lldb-mi-3.7.0+0x000000155e62)

    #8 CMIDriver::DoMainLoop()
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriver.cpp:631
(lldb-mi-3.7.0+0x000000155d37)

    #9 non-virtual thunk to CMIDriver::DoMainLoop()
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriver.cpp:648
(lldb-mi-3.7.0+0x000000155fbd)

    #10 CMIDriverMgr::DriverMainLoop()
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriverMgr.cpp:340
(lldb-mi-3.7.0+0x000000159ee6)

    #11 main
/usr/local/google/home/vharron/ll/tot/llvm/tools/lldb/tools/lldb-mi/MIDriverMain.cpp:364
(lldb-mi-3.7.0+0x000000158f60)



-- 

Vince Harron | Technical Lead Manager | vharron at google.com | 858-442-0868
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