[llvm-bugs] [Bug 24842] New: Crash in clang::ASTReader::ReadSLocEntry

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24842

            Bug ID: 24842
           Summary: Crash in clang::ASTReader::ReadSLocEntry
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kalinichev.so.0 at gmail.com
                CC: akyrtzi at gmail.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org
    Classification: Unclassified

This a regression caused by:

r220966 | akirtzidis | 2014-10-31 20:44:32 +0400 (Fri, 31 Oct 2014) | 1 line

[libclang] Disable spell-checking and warnings during code-completion since
they are not needed.

Reverting that commit, fixes the issue.

No easy reproducible test case available, but here is a backtrace:

0x00007fff8ee08225 in clang::ASTReader::ReadSLocEntry (
    this=0x7fff996ade30, ID=-24789)
    at /Projects/llvm/tools/clang/lib/Serialization/ASTReader.cpp:1196
1196      F->SLocEntryCursor.JumpToBit(F->SLocEntryOffsets[ID -
F->SLocEntryBaseID]);
(gdb) bt
#0  0x00007fff8ee08225 in clang::ASTReader::ReadSLocEntry (
    this=0x7fff996ade30, ID=-24789)
    at /Projects/llvm/tools/clang/lib/Serialization/ASTReader.cpp:1196
#1  0x00007fff8ee0ae22 in non-virtual thunk to
clang::ASTReader::ReadSLocEntry(int) ()
    at /Projects/llvm/tools/clang/lib/Serialization/ASTReader.cpp:1313
#2  0x00007fff8d4ccb09 in clang::SourceManager::loadSLocEntry (
    this=0x7fff066e1710, Index=24787, Invalid=0x0)
    at /Projects/llvm/tools/clang/lib/Basic/SourceManager.cpp:467
#3  0x00007fff8cfd60de in clang::SourceManager::getLoadedSLocEntry (
    this=0x7fff066e1710, Index=24787, Invalid=0x0)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:1494
#4  0x00007fff8cfd5dff in clang::SourceManager::getLoadedSLocEntryByID (
    this=0x7fff066e1710, ID=-24789, Invalid=0x0)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:1577
#5  0x00007fff8cfd5da9 in clang::SourceManager::getSLocEntryByID (
    this=0x7fff066e1710, ID=-24789, Invalid=0x0)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:1571
#6  0x00007fff8cfd5d0b in clang::SourceManager::isOffsetInFileID (
    this=0x7fff066e1710, FID=..., SLocOffset=2140763772)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:1604
#7  0x00007fff8d4cea43 in clang::SourceManager::getFileIDLoaded (
    this=0x7fff066e1710, SLocOffset=2140763772)
    at /Projects/llvm/tools/clang/lib/Basic/SourceManager.cpp:880
#8  0x00007fff8d4ce2b9 in clang::SourceManager::getFileIDSlow (
    this=0x7fff066e1710, SLocOffset=2140763772)
    at /Projects/llvm/tools/clang/lib/Basic/SourceManager.cpp:725
#9  0x00007fff8cfb3b49 in clang::SourceManager::getFileID (
    this=0x7fff066e1710, SpellingLoc=...)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:968
#10 0x00007fff8cfa75f5 in clang::SourceManager::getDecomposedLoc (
    this=0x7fff066e1710, Loc=...)
    at /Projects/llvm/tools/clang/include/clang/Basic/SourceManager.h:1089
#11 0x00007fff8d019936 in clang_getFileLocation (location=..., 
    file=0x0, line=0x7fffc0e7bab4, column=0x7fffc0e7bab0, 
    offset=0x0)
    at /Projects/llvm/tools/clang/tools/libclang/CXSourceLocation.cpp:374

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