[llvm-bugs] [Bug 31189] New: opt crashes with "opt -instcombine -functionattrs -licm -licm": UNREACHABLE executed at /tmp/llvm-builder/llvm-source-trunk/lib/IR/Value.cpp:822!

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31189

            Bug ID: 31189
           Summary: opt crashes with "opt -instcombine -functionattrs
                    -licm -licm": UNREACHABLE executed at
                    /tmp/llvm-builder/llvm-source-trunk/lib/IR/Value.cpp:8
                    22!
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

$ clang -v
clang version 4.0.0 (trunk 287994)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
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/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang -c -emit-llvm -w -o small.bc small.c
$ opt -instcombine -functionattrs -licm -licm -o small-opt.bc small.bc
While deleting: i32 %call
An asserting value handle still pointed to this value!
UNREACHABLE executed at
/tmp/llvm-builder/llvm-source-trunk/lib/IR/Value.cpp:822!
#0 0x0000000001c45c65 (opt+0x1c45c65)
#1 0x0000000001c43d4e (opt+0x1c43d4e)
#2 0x0000000001c43eb0 (opt+0x1c43eb0)
#3 0x00007f4cf9abb330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f4cf88a7c37 gsignal
/build/eglibc-oGUzwX/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f4cf88ab028 abort
/build/eglibc-oGUzwX/eglibc-2.19/stdlib/abort.c:91:0
#6 0x0000000001bef47a (opt+0x1bef47a)
#7 0x0000000001819ed8 (opt+0x1819ed8)
#8 0x000000000181ad1d (opt+0x181ad1d)
#9 0x00000000017b6499 (opt+0x17b6499)
#10 0x00000000017b25b5 (opt+0x17b25b5)
#11 0x0000000001ab5984 (opt+0x1ab5984)
#12 0x0000000001ab58af (opt+0x1ab58af)
#13 0x0000000001ab58af (opt+0x1ab58af)
#14 0x0000000001ab660a (opt+0x1ab660a)
#15 0x0000000001ab6b24 (opt+0x1ab6b24)
#16 0x00000000013465fb (opt+0x13465fb)
#17 0x00000000017e0053 (opt+0x17e0053)
#18 0x00000000012b8157 (opt+0x12b8157)
#19 0x00000000017e0daa (opt+0x17e0daa)
#20 0x000000000078cfc1 (opt+0x78cfc1)
#21 0x00007f4cf8892f45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#22 0x00000000007e756b (opt+0x7e756b)
Stack dump:
0.      Program arguments: opt -instcombine -functionattrs -licm -licm -o
small-opt.bc small.bc 
1.      Running pass 'CallGraph Pass Manager' on module 'small.bc'.
2.      Running pass 'Loop Pass Manager' on function '@fn2'
3.      Running pass 'Loop Invariant Code Motion' on basic block '%while.cond1'
Aborted (core dumped)
$ 


----------------------------------


int a, b;

void fn1 (int p) {}

int fn2 ()
{
  while (a) 
    while (a) 
      fn1 (b || fn2 ());
  return 0;
}

int main ()
{
  fn2 (); 
  return 0;
}

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