Enabling the LifetimeEnds CFGElement crashes the compiler during CFG construction

[sulekhark]

Test case:

extern int bar(char *s, int n);

// test case from CodeGen/lifetime2.c
void backpatched_goto2() {
{
char x;
label:
bar(&x, 1);
}
goto label;
}
Command line: ./bin/clang -cc1 -analyze -analyzer-checker=debug.DumpCFG -analyzer-config cfg-lifetime=true,cfg-temporary-dtors=false,cfg-rich-constructors=false -analyzer-config cfg-implicit-dtors=false ../DEBUG_lifetime/r1.cpp

Crash Backtrace:

Starting program: /home/sulekha/Work/checkedc-clang/build/bin/clang -cc1 -analyze -analyzer-checker=debug.DumpCFG -analyzer-config cfg-lifetime=true,cfg-temporary-dtors=false,cfg-rich-constructors=false -analyzer-config cfg-implicit-dtors=false ../DEBUG_lifetime/r1.cpp
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
clang: /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp:333: int {anonymous}::LocalScope::const_iterator::distance({anonymous}::LocalScope::const_iterator): Assertion `F != const_iterator() && "L iterator is not reachable from F iterator."' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) where
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff7a57859 in __GI_abort () at abort.c:79
#2 0x00007ffff7a57729 in __assert_fail_base (fmt=0x7ffff7bed588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x555561fbc050 "F != const_iterator() && "L iterator is not reachable from F iterator."",
file=0x555561fbbd70 "/home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp", line=333, function=) at assert.c:92
#3 0x00007ffff7a68f36 in GI___assert_fail (assertion=0x555561fbc050 "F != const_iterator() && "L iterator is not reachable from F iterator."", file=0x555561fbbd70 "/home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp", line=333,
function=0x555561fbbff0 "int {anonymous}::LocalScope::const_iterator::distance({anonymous}::LocalScope::const_iterator)") at assert.c:101
#4 0x000055555dff2c85 in (anonymous namespace)::LocalScope::const_iterator::distance (this=0x7fffffffb970, L=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp:333
#5 0x000055555dff8fd7 in (anonymous namespace)::CFGBuilder::prependAutomaticObjLifetimeWithTerminator (this=0x7fffffffbb80, Blk=0x555564cac768, B=..., E=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp:2089
#6 0x000055555dff6d08 in (anonymous namespace)::CFGBuilder::buildCFG (this=0x7fffffffbb80, D=0x555564c85068, Statement=0x555564c85420) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp:1556
#7 0x000055555e003119 in clang::CFG::buildCFG (D=0x555564c85068, Statement=0x555564c85420, C=0x555564c2a940, BO=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/CFG.cpp:4955
#8 0x000055555dfe0767 in clang::AnalysisDeclContext::getCFG (this=0x555564c3d820) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Analysis/AnalysisDeclContext.cpp:218
#9 0x000055555bd5fe83 in clang::ento::AnalysisManager::getCFG (this=0x555564c45990, D=0x555564c85068) at /home/sulekha/Work/checkedc-clang/src/clang/include/clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h:109
#10 0x000055555bcf1671 in (anonymous namespace)::AnalysisConsumer::HandleCode (this=0x555564c34600, D=0x555564c85068, Mode=1, IMode=clang::ento::ExprEngine::Inline_Minimal, VisitedCallees=0x0)
at /home/sulekha/Work/checkedc-clang/src/clang/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp:657
#11 0x000055555bceffcd in (anonymous namespace)::AnalysisConsumer::VisitFunctionDecl (this=0x555564c34600, FD=0x555564c85068) at /home/sulekha/Work/checkedc-clang/src/clang/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp:305
#12 0x000055555bd05848 in clang::RecursiveASTVisitor<(anonymous namespace)::AnalysisConsumer>::WalkUpFromFunctionDecl (this=0x555564c34600, D=0x555564c85068) at tools/clang/include/clang/AST/DeclNodes.inc:401
#13 0x000055555bcfa48d in clang::RecursiveASTVisitor<(anonymous namespace)::AnalysisConsumer>::TraverseFunctionDecl (this=0x555564c34600, D=0x555564c85068) at /home/sulekha/Work/checkedc-clang/src/clang/include/clang/AST/RecursiveASTVisitor.h:2060
#14 0x000055555bcf28d6 in clang::RecursiveASTVisitor<(anonymous namespace)::AnalysisConsumer>::TraverseDecl (this=0x555564c34600, D=0x555564c85068) at tools/clang/include/clang/AST/DeclNodes.inc:401
#15 0x000055555bcf0a0a in (anonymous namespace)::AnalysisConsumer::runAnalysisOnTranslationUnit (this=0x555564c34600, C=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp:510
#16 0x000055555bcf0c46 in (anonymous namespace)::AnalysisConsumer::HandleTranslationUnit (this=0x555564c34600, C=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp:544
#17 0x000055555c7670b7 in clang::ParseAST (S=..., PrintStats=false, SkipFunctionBodies=false) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Parse/ParseAST.cpp:171
#18 0x000055555a338ec9 in clang::ASTFrontendAction::ExecuteAction (this=0x555564c15d90) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Frontend/FrontendAction.cpp:1057
#19 0x000055555a338820 in clang::FrontendAction::Execute (this=0x555564c15d90) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Frontend/FrontendAction.cpp:950
#20 0x000055555a2c92f5 in clang::CompilerInstance::ExecuteAction (this=0x555564c0aea0, Act=...) at /home/sulekha/Work/checkedc-clang/src/clang/lib/Frontend/CompilerInstance.cpp:984
#21 0x000055555a4d449f in clang::ExecuteCompilerInvocation (Clang=0x555564c0aea0) at /home/sulekha/Work/checkedc-clang/src/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:278
#22 0x0000555557aa68c5 in cc1_main (Argv=..., Argv0=0x7fffffffe539 "/home/sulekha/Work/checkedc-clang/build/bin/clang", MainAddr=0x555557a99eda <GetExecutablePath[abi:cxx11](char const*, bool)>) at /home/sulekha/Work/checkedc-clang/src/clang/tools/driver/cc1_main.cpp:240
#23 0x0000555557a9b783 in ExecuteCC1Tool (ArgV=...) at /home/sulekha/Work/checkedc-clang/src/clang/tools/driver/driver.cpp:330
#24 0x0000555557a9bf49 in main (argc=9, argv=0x7fffffffe298) at /home/sulekha/Work/checkedc-clang/src/clang/tools/driver/driver.cpp:407