[llvm-bugs] [Bug 43555] New: crash when using "-ftime-trace" and "-o /dev/null"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43555

            Bug ID: 43555
           Summary: crash when using "-ftime-trace" and "-o /dev/null"
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mbeardsl at mathworks.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 22626
  --> https://bugs.llvm.org/attachment.cgi?id=22626&action=edit
Preprocessed source(s) and associated run script(s)

The following clang command crashes:
$ clang-9 -o /dev/null -c -ftime-trace tiny.cpp


tiny.cpp contents are as follows (the actual program doesn't matter)

int foo();

int foo() {
    return 5;
}



clang output/stack/etc:

$ clang-9 -o /dev/null -c -ftime-trace tiny.cpp
error: unable to open output file '/dev/null.json': 'Permission denied'
Stack dump:
0.      Program arguments:
/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -discard-value-names -main-file-name tiny.cpp
-mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno
-masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array
-target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file
/dev/null.gcno -resource-dir
/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/lib/clang/9.0.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward
-internal-isystem /usr/local/include -internal-isystem
/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/lib/clang/9.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdeprecated-macro -fdebug-compilation-dir /home/mbeardsl/Desktop/cpp/cpp
-ferror-limit 19 -fmessage-length 0 -ftime-trace -fobjc-runtime=gcc
-fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics
-faddrsig -o /dev/null -x c++ tiny.cpp 
 #0 0x0000000002087814 PrintStackTraceSignalHandler(void*)
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x2087814)
 #1 0x00000000020856ce llvm::sys::RunSignalHandlers()
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x20856ce)
 #2 0x0000000002087c08 SignalHandler(int)
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x2087c08)
 #3 0x00007f2a6c6da0c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x110c0)
 #4 0x000000000208d2ba llvm::json::OStream::objectBegin()
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x208d2ba)
 #5 0x0000000002057e27 llvm::TimeTraceProfiler::Write(llvm::raw_pwrite_stream&)
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x2057e27)
 #6 0x00000000009e3dbb cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x9e3dbb)
 #7 0x00000000009e1f5f main
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x9e1f5f)
 #8 0x00007f2a6b25d2b1 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b1)
 #9 0x00000000009df129 _start
(/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang-9+0x9df129)
clang-9: error: unable to execute command: Segmentation fault
clang-9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 9.0.0 (https://github.com/llvm-mirror/llvm
c62b24f070c9a4bb1a76409e623042a740cac4cd)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/mbeardsl/clang9/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-16.04/bin
clang-9: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
clang-9: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-9: note: diagnostic msg: /tmp/tiny-95ec21.cpp
clang-9: note: diagnostic msg: /tmp/tiny-95ec21.sh
clang-9: note: diagnostic msg: 

********************



clang's generated files "/tmp/tiny-95ec21.cpp" and "/tmp/tiny-95ec21.sh" are
attached in clang_generated_repro_files.zip



When giving any real (non-/dev/null) file name for "-o", everything works of
course

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