[llvm-bugs] [Bug 30650] New: bugpoint reduced testcase crashes lli (MCJIT)

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30650

            Bug ID: 30650
           Summary: bugpoint reduced testcase crashes lli (MCJIT)
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: lli
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

While I was reducing #30448, I hit this.


; ModuleID = 'reduced-bugpoint.ll'
source_filename = "bugpoint-output-774e2d5.bc"
target triple = "x86_64-unknown-linux-gnu"

@d = local_unnamed_addr global i32 8, align 4
@j = local_unnamed_addr global [1 x i64] [i64 6069905], align 8
@a = common local_unnamed_addr global i32 0, align 4
@c = common local_unnamed_addr global i32 0, align 4
@e = common local_unnamed_addr global i32 0, align 4
@f = common local_unnamed_addr global i32 0, align 4
@g = common local_unnamed_addr global i32 0, align 4
@h = external local_unnamed_addr global i32, align 4
@n = common local_unnamed_addr global i32 0, align 4
@o = common local_unnamed_addr global i32 0, align 4
@p = common local_unnamed_addr global i32 0, align 4
@b = common local_unnamed_addr global i64 0, align 8
@r = external local_unnamed_addr global i64, align 8
@i = common global i64 0, align 8

declare signext i8 @fn1(i32, i32) local_unnamed_addr

define i32 @main() local_unnamed_addr {
entry:
  br label %for.cond4thread-pre-split.i

for.body12.i.us:                                  ; preds = %for.inc7.i
  br label %for.cond19.preheader.i.preheader.us

for.cond19.preheader.i.preheader.us:              ; preds = %for.body12.i.us
  br i1 undef, label %for.cond19.preheader.i.us.us.preheader, label
%for.cond19.preheader.i.us1.preheader

for.cond19.preheader.i.us1.preheader:             ; preds =
%for.cond19.preheader.i.preheader.us
  unreachable

for.cond19.preheader.i.us.us.preheader:           ; preds =
%for.cond19.preheader.i.preheader.us
  ret i32 0

for.cond4thread-pre-split.i:                      ; preds = %entry
  br i1 false, label %for.inc7.i, label %for.inc.preheader.i

for.inc.preheader.i:                              ; preds =
%for.cond4thread-pre-split.i
  unreachable

for.inc7.i:                                       ; preds =
%for.cond4thread-pre-split.i
  br label %for.body12.i.us
}

$ gdb --args ~/work/llvm/build-gcc/bin/lli reduced-crash.ll 
GNU gdb (GDB) Fedora 7.11.1-75.fc24
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /home/davide/work/llvm/build-gcc/bin/lli...done.
(gdb) r
Starting program: /home/davide/work/llvm/build-gcc/bin/lli reduced-crash.ll
Missing separate debuginfos, use: dnf debuginfo-install
glibc-2.23.1-10.fc24.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ff4000 in ?? ()
Missing separate debuginfos, use: dnf debuginfo-install
libgcc-6.1.1-3.fc24.x86_64 libstdc++-6.1.1-3.fc24.x86_64
ncurses-libs-6.0-6.20160709.fc24.x86_64 zlib-1.2.8-10.fc24.x86_64
(gdb) bt
#0  0x00007ffff7ff4000 in ?? ()
#1  0x00000000012b6f65 in llvm::MCJIT::runFunction (this=0x2f7ccc0,
F=0x2f792e8, ArgValues=...)
    at ../lib/ExecutionEngine/MCJIT/MCJIT.cpp:569
#2  0x00000000012311a0 in llvm::ExecutionEngine::runFunctionAsMain
(this=0x2f7ccc0, Fn=0x2f792e8, 
    argv=std::vector of length 1, capacity 1 = {...}, envp=0x7fffffffe160) at
../lib/ExecutionEngine/ExecutionEngine.cpp:471
#3  0x0000000000c52675 in main (argc=2, argv=0x7fffffffe148,
envp=0x7fffffffe160) at ../tools/lli/lli.cpp:631
(gdb) f 1
#1  0x00000000012b6f65 in llvm::MCJIT::runFunction (this=0x2f7ccc0,
F=0x2f792e8, ArgValues=...)
    at ../lib/ExecutionEngine/MCJIT/MCJIT.cpp:569
569             rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());

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