[LLVMbugs] [Bug 22340] New: Infinite loop to memory exhaustion with alloca on 3.3 to trunk

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22340

            Bug ID: 22340
           Summary: Infinite loop to memory exhaustion with alloca on 3.3
                    to trunk
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sbahra at backtrace.io
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

We caught this in a tools regression suite. It appears that any expression
involving at least more than 40 bits of precision triggers this. The attachment
includes a test program that triggers this behavior (using SIZE_MAX, but at
least 0xfffffffffff1ULL is sufficient) and some traces over time (full/
contains truncated stack crawling, and minidump/ contains minidump/ snapshots
over time).

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