[llvm-bugs] [Bug 30514] New: Assertion `!NodePtr->isKnownSentinel()' failed [regression, AMDGPU]

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30514

            Bug ID: 30514
           Summary: Assertion `!NodePtr->isKnownSentinel()' failed
                    [regression, AMDGPU]
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: vedran at miletic.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The Talos Principle crashes on AMDGPU with:

Talos: /home/vedranm/workspace/llvm/include/llvm/ADT/ilist_iterator.h:126:
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::operator*() const [with
OptionsT = llvm::ilist_detail::node_options<llvm::MachineInstr, true, true,
void>; bool IsReverse = false; bool IsConst = true;
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference = const
llvm::MachineInstr&]: Assertion `!NodePtr->isKnownSentinel()' failed.

6037e199c8a061b2e9cb22c434644a0eac659fb9 is the first bad commit
commit 6037e199c8a061b2e9cb22c434644a0eac659fb9
Author: Duncan P. N. Exon Smith <dexonsmith at apple.com>
Date:   Sun Sep 11 16:38:18 2016 +0000

    CodeGen: Turn on sentinel tracking for MachineInstr iterators

    This is a prep commit before fixing MachineBasicBlock::reverse_iterator
    invalidation semantics, ala r281167 for ilist::reverse_iterator.  This
    changes MachineBasicBlock::Instructions to track which node is the
    sentinel regardless of LLVM_ENABLE_ABI_BREAKING_CHECKS.

    There's almost no functionality change (aside from ABI).  However, in
    the rare configuration:

        #if !defined(NDEBUG) && !defined(LLVM_ENABLE_ABI_BREAKING_CHECKS)

    the isKnownSentinel() assertions in ilist_iterator<>::operator* suddenly
    have teeth for MachineInstr.  If these assertions start firing for your
    out-of-tree backend, have a look at the suggestions in the commit
    message for r279314, and at some of the commits leading up to it that
    avoid dereferencing the end() iterator.

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281168
91177308-0d34-0410-b5e6-96231b3b80d8

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