[llvm-bugs] [Bug 48296] New: opt crash with "-mem2reg -simplifycfg -instcombine -jump-threading -correlated-propagation -lcssa -loop-rotate -loop-vectorize": Assertion `!verifyFunction(*L->getHeader()->getParent(), &dbgs())' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48296

            Bug ID: 48296
           Summary: opt crash with "-mem2reg -simplifycfg -instcombine
                    -jump-threading -correlated-propagation -lcssa
                    -loop-rotate -loop-vectorize": Assertion
                    `!verifyFunction(*L->getHeader()->getParent(),
                    &dbgs())' failed.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: suochenyao at 163.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24211
  --> https://bugs.llvm.org/attachment.cgi?id=24211&action=edit
bc file about this bug

*******************************************************************************
OS and Platform:
CentOS Linux release 7.8.2003 (Core), x86_64 GNU/Linux
*******************************************************************************
Program:
int a, b, c;
char d, e;
int f[10];
static int(g)() { return 0; }
char h() {
  for (;; a) {
    int i = 0;
    for (; i; i++)
      f[i] = 9;
    if (g()) {
      long j=0;
      for (;; d) {
        int k=0;
        {
          short l=0;
          if (c)
            break;
        }
        if (e & 0)
          return b;
      }
    }
  }
}
int main() {}
*******************************************************************************
clang version:
$ clang --version
clang version 12.0.0 (/home/suocy/src/llvm-dev/llvm-project/llvm/tools/clang
abbf4802bb4fb519dce436ba16d90c3eeb1135b1)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/suocy/bin/llvm-dev/bin
*******************************************************************************
Command Lines:
$ clang -O3 -mllvm -disable-llvm-optzns -c -emit-llvm a.c -o a.bc
a.c:6:11: warning: expression result unused [-Wunused-value]
  for (;; a) {
          ^
a.c:12:15: warning: expression result unused [-Wunused-value]
      for (;; d) {
              ^
2 warnings generated.
$ opt -mem2reg -simplifycfg -instcombine -jump-threading
-correlated-propagation -lcssa -loop-rotate -loop-vectorize a.bc -o a.opt.bc
PHI nodes must have at least one entry.  If the block is dead, the PHI should
be removed!
  %cleanup.dest.slot.3 = phi i32
opt:
/home/suocy/src/llvm-dev/llvm-project/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:8623:
bool llvm::LoopVectorizePass::processLoop(llvm::Loop*): Assertion
`!verifyFunction(*L->getHeader()->getParent(), &dbgs())' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: /home/suocy/bin/llvm-dev/bin/opt -mem2reg
-simplifycfg -instcombine -jump-threading -correlated-propagation -lcssa
-loop-rotate -loop-vectorize a.bc -o a.opt.bc
1.      Running pass 'Function Pass Manager' on module 'a.bc'.
2.      Running pass 'Loop Vectorization' on function '@h'
 #0 0x0000000002a7842c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/home/suocy/bin/llvm-dev/bin/opt+0x2a7842c)
 #1 0x0000000002a762a4 llvm::sys::RunSignalHandlers()
(/home/suocy/bin/llvm-dev/bin/opt+0x2a762a4)
 #2 0x0000000002a76403 SignalHandler(int)
(/home/suocy/bin/llvm-dev/bin/opt+0x2a76403)
 #3 0x00007f5abdab9630 __restore_rt (/lib64/libpthread.so.0+0xf630)
 #4 0x00007f5abc6a7387 raise (/lib64/libc.so.6+0x36387)
 #5 0x00007f5abc6a8a78 abort (/lib64/libc.so.6+0x37a78)
 #6 0x00007f5abc6a01a6 __assert_fail_base (/lib64/libc.so.6+0x2f1a6)
 #7 0x00007f5abc6a0252 (/lib64/libc.so.6+0x2f252)
 #8 0x0000000002c5291f llvm::LoopVectorizePass::processLoop(llvm::Loop*)
(/home/suocy/bin/llvm-dev/bin/opt+0x2c5291f)
 #9 0x0000000002c53ab9 llvm::LoopVectorizePass::runImpl(llvm::Function&,
llvm::ScalarEvolution&, llvm::LoopInfo&, llvm::TargetTransformInfo&,
llvm::DominatorTree&, llvm::BlockFrequencyInfo&, llvm::TargetLibraryInfo*,
llvm::DemandedBits&, llvm::AAResults&, llvm::AssumptionCache&,
std::function<llvm::LoopAccessInfo const& (llvm::Loop&)>&,
llvm::OptimizationRemarkEmitter&, llvm::ProfileSummaryInfo*)
(/home/suocy/bin/llvm-dev/bin/opt+0x2c53ab9)
#10 0x0000000002c54354 (anonymous
namespace)::LoopVectorize::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x2c54354)
#11 0x00000000022b7d38 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x22b7d38)
#12 0x00000000022b87d9 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x22b87d9)
#13 0x00000000022b75e3 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x22b75e3)
#14 0x000000000072ba1b main (/home/suocy/bin/llvm-dev/bin/opt+0x72ba1b)
#15 0x00007f5abc693555 __libc_start_main (/lib64/libc.so.6+0x22555)
#16 0x00000000007dcc45 _start (/home/suocy/bin/llvm-dev/bin/opt+0x7dcc45)
Aborted

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