[llvm-bugs] [Bug 26909] New: bugpoint crashes when reducing the attached bitcode program

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26909

            Bug ID: 26909
           Summary: bugpoint crashes when reducing the attached bitcode
                    program
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: bugpoint
          Assignee: unassignedbugs at nondot.org
          Reporter: chengniansun at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16021
  --> https://llvm.org/bugs/attachment.cgi?id=16021&action=edit
bug triggering bitcode file.

The trunk of bugpoint crashes when reducing the attached bitcode file. 


$: bugpoint-trunk -safe-run-llc -structurizecfg t.c-262.bc 
....................................
*** The following function is being miscompiled:  main_for.inc595.5
Extracted a loop from the breaking portion of the program.
<llc><CC><program>bugpoint-trunk:
/tmp/llvm-builder/llvm-source-trunk/include/llvm/Support/Casting.h:81: static
bool llvm::isa_impl_cl<To, From*>::doit(const From*) [with To = llvm::Function;
>From = llvm::Value]: Assertion `Val && "isa<> used on a null pointer"' failed.
0  bugpoint-trunk  0x0000000000c48f25
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  bugpoint-trunk  0x0000000000c46eb6 llvm::sys::RunSignalHandlers() + 54
2  bugpoint-trunk  0x0000000000c470d4
3  libpthread.so.0 0x00007f5f6c022340
4  libc.so.6       0x00007f5f6b240cc9 gsignal + 57
5  libc.so.6       0x00007f5f6b2440d8 abort + 328
6  libc.so.6       0x00007f5f6b239b86
7  libc.so.6       0x00007f5f6b239c32
8  bugpoint-trunk  0x0000000000506830
9  bugpoint-trunk  0x00000000005d1e8e
10 bugpoint-trunk  0x00000000005d21ee
llvm::BugDriver::debugMiscompilation(std::string*) + 510
11 bugpoint-trunk  0x00000000005b21b5 llvm::BugDriver::run(std::string&) + 1957
12 bugpoint-trunk  0x000000000059c944 main + 916
13 libc.so.6       0x00007f5f6b22bec5 __libc_start_main + 245
14 bugpoint-trunk  0x00000000005aff38
Stack dump:
0.      Program arguments: bugpoint-trunk -safe-run-llc -structurizecfg
t.c-262.bc 
Aborted (core dumped)

$: clang-trunk -v
clang version 3.9.0 (trunk 262768)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$: bugpoint-trunk --version
LLVM (http://llvm.org/):
  LLVM version 3.9.0svn
  Optimized build with assertions.
  Built Mar  4 2016 (22:44:51).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: sandybridge
$:

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