[llvm-bugs] [Bug 26981] New: Is it a sign of miscompilation?

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26981

            Bug ID: 26981
           Summary: Is it a sign of miscompilation?
           Product: libraries
           Version: 3.8
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: tulipawn at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

After doing a Release+Assertions build on ARM with gcc-4.9.3 I'm seeing the
following error during the very first part of stage1, bootstrapping Rust:

src/llvm/lib/IR/Attributes.cpp:876: llvm::AttributeSet
llvm::AttributeSet::removeAttributes(llvm::LLVMContext&, unsigned int,
llvm::AttributeSet) const: Assertion `!Attrs.hasAttribute(Index,
Attribute::Alignment) && "Attempt to change alignment!"' failed.


(gdb) bt
#0  __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:44
#1  0xb6a30f0e in __GI_raise (sig=sig at entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#2  0xb6a33766 in __GI_abort () at abort.c:89
#3  0xb6a2c150 in __assert_fail_base (fmt=0x1 <error: Cannot access memory at
address 0x1>, 
    assertion=0xb41c8e88 "!Attrs.hasAttribute(Index, Attribute::Alignment) &&
\"Attempt to change alignment!\"", assertion at entry=0x0, 
    file=0xb41c8434 "/src/llvm/lib/IR/Attributes.cpp", file at entry=0xb244f2a0
"\001", line=876, line at entry=3064918188, 
    function=function at entry=0xb4c744f0 "llvm::AttributeSet
llvm::AttributeSet::removeAttributes(llvm::LLVMContext&, unsigned int,
llvm::AttributeSet) const") at assert.c:92
#4  0xb6a2c1e6 in __GI___assert_fail (assertion=0x0, file=0xb244f2a0 "\001",
line=3064918188, 
    function=0xb4c744f0 "llvm::AttributeSet
llvm::AttributeSet::removeAttributes(llvm::LLVMContext&, unsigned int,
llvm::AttributeSet) const") at assert.c:101
#5  0xb3dc95cc in llvm::AttributeSet::removeAttributes(llvm::LLVMContext&,
unsigned int, llvm::AttributeSet) const ()
   from
/arm-unknown-linux-gnueabihf/stage1/bin/../lib/librustc_llvm-9026086f.so
#6  0xb3e09170 in LLVMRemoveFunctionAttr ()
   from
/arm-unknown-linux-gnueabihf/stage1/bin/../lib/librustc_llvm-9026086f.so
#7  0xb628e5ec in trans::attributes::from_fn_attrs::h75cc605b937fa118Rlh ()
   from
/arm-unknown-linux-gnueabihf/stage1/bin/../lib/librustc_trans-9026086f.so
#8  0xb6258b7c in ?? ()
   from
/arm-unknown-linux-gnueabihf/stage1/bin/../lib/librustc_trans-9026086f.so

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