java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 20:52:28,581 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:52:28,583 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:52:28,595 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 20:52:28,595 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 20:52:28,596 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 20:52:28,598 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 20:52:28,599 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 20:52:28,601 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 20:52:28,602 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 20:52:28,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 20:52:28,604 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 20:52:28,605 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 20:52:28,606 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 20:52:28,607 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 20:52:28,608 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 20:52:28,609 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 20:52:28,610 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 20:52:28,612 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 20:52:28,614 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 20:52:28,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 20:52:28,619 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 20:52:28,620 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 20:52:28,621 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 20:52:28,623 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-03 20:52:28,624 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-03 20:52:28,624 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-03 20:52:28,625 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-03 20:52:28,626 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-03 20:52:28,627 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-03 20:52:28,627 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 20:52:28,628 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 20:52:28,629 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 20:52:28,629 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 20:52:28,630 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 20:52:28,631 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 20:52:28,631 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 20:52:28,631 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 20:52:28,632 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 20:52:28,633 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 20:52:28,633 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 20:52:28,634 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-03 20:52:28,649 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:52:28,649 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:52:28,650 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 20:52:28,650 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 20:52:28,650 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 20:52:28,651 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 20:52:28,651 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 20:52:28,651 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 20:52:28,651 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 20:52:28,651 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 20:52:28,652 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:52:28,652 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:52:28,653 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:52:28,653 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:52:28,653 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:52:28,653 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:52:28,653 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:52:28,654 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:52:28,654 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:52:28,654 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:52:28,654 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:52:28,654 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 20:52:28,655 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:52:28,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:52:28,655 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:52:28,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:52:28,655 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 20:52:28,656 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:52:28,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:52:28,656 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 20:52:28,685 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:52:28,698 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:52:28,701 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:52:28,703 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:52:28,703 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:52:28,704 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr.i [2019-09-03 20:52:28,788 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86cdd0218/615d6f2709e2419f8cdca3c328e8b8b6/FLAGb6f4f6ecd [2019-09-03 20:52:29,191 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:52:29,191 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr.i [2019-09-03 20:52:29,197 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86cdd0218/615d6f2709e2419f8cdca3c328e8b8b6/FLAGb6f4f6ecd [2019-09-03 20:52:29,614 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86cdd0218/615d6f2709e2419f8cdca3c328e8b8b6 [2019-09-03 20:52:29,622 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:52:29,624 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:52:29,625 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:52:29,625 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:52:29,628 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:52:29,629 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:29,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64fd318c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29, skipping insertion in model container [2019-09-03 20:52:29,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:29,641 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:52:29,658 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:52:29,853 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:52:29,862 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:52:29,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:52:29,903 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:52:29,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29 WrapperNode [2019-09-03 20:52:29,904 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:52:29,905 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:52:29,905 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:52:29,905 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:52:30,009 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,022 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,027 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,035 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,040 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... [2019-09-03 20:52:30,048 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:52:30,049 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:52:30,049 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:52:30,049 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:52:30,050 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:52:30,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:52:30,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:52:30,109 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:52:30,110 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:52:30,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:52:30,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-03 20:52:30,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:52:30,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-03 20:52:30,110 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:52:30,111 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:52:30,111 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:52:30,294 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:52:30,295 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-03 20:52:30,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:52:30 BoogieIcfgContainer [2019-09-03 20:52:30,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:52:30,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:52:30,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:52:30,300 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:52:30,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:52:29" (1/3) ... [2019-09-03 20:52:30,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ffa8ee4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:52:30, skipping insertion in model container [2019-09-03 20:52:30,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:52:29" (2/3) ... [2019-09-03 20:52:30,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ffa8ee4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:52:30, skipping insertion in model container [2019-09-03 20:52:30,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:52:30" (3/3) ... [2019-09-03 20:52:30,304 INFO L109 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2019-09-03 20:52:30,321 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:52:30,333 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:52:30,364 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:52:30,407 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:52:30,408 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 20:52:30,408 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:52:30,408 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:52:30,408 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:52:30,409 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:52:30,409 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:52:30,409 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:52:30,428 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-09-03 20:52:30,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 20:52:30,441 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:52:30,442 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:52:30,445 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:52:30,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:52:30,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1261819063, now seen corresponding path program 1 times [2019-09-03 20:52:30,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:52:30,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:52:30,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,508 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:52:30,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:30,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:52:30,575 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:52:30,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-03 20:52:30,575 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:52:30,579 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-03 20:52:30,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-03 20:52:30,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:52:30,594 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2019-09-03 20:52:30,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:52:30,609 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2019-09-03 20:52:30,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-03 20:52:30,610 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2019-09-03 20:52:30,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:52:30,618 INFO L225 Difference]: With dead ends: 25 [2019-09-03 20:52:30,619 INFO L226 Difference]: Without dead ends: 17 [2019-09-03 20:52:30,621 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:52:30,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-03 20:52:30,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-03 20:52:30,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-03 20:52:30,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-09-03 20:52:30,653 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2019-09-03 20:52:30,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:52:30,654 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-09-03 20:52:30,654 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-03 20:52:30,654 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-09-03 20:52:30,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 20:52:30,655 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:52:30,656 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:52:30,656 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:52:30,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:52:30,657 INFO L82 PathProgramCache]: Analyzing trace with hash -599256242, now seen corresponding path program 1 times [2019-09-03 20:52:30,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:52:30,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:52:30,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,660 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:52:30,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:30,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:52:30,763 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:52:30,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-03 20:52:30,764 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:52:30,765 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:52:30,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:52:30,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-03 20:52:30,767 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 5 states. [2019-09-03 20:52:30,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:52:30,872 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2019-09-03 20:52:30,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:52:30,873 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2019-09-03 20:52:30,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:52:30,874 INFO L225 Difference]: With dead ends: 26 [2019-09-03 20:52:30,874 INFO L226 Difference]: Without dead ends: 22 [2019-09-03 20:52:30,875 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-03 20:52:30,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-03 20:52:30,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-09-03 20:52:30,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-03 20:52:30,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-09-03 20:52:30,882 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 16 [2019-09-03 20:52:30,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:52:30,883 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-09-03 20:52:30,883 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:52:30,884 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-09-03 20:52:30,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-03 20:52:30,885 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:52:30,885 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:52:30,886 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:52:30,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:52:30,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1373758515, now seen corresponding path program 1 times [2019-09-03 20:52:30,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:52:30,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:52:30,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:30,889 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:52:30,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-03 20:52:30,976 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:52:30,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-03 20:52:30,977 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:52:30,977 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:52:30,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:52:30,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-03 20:52:30,978 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2019-09-03 20:52:31,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:52:31,040 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2019-09-03 20:52:31,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:52:31,041 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2019-09-03 20:52:31,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:52:31,042 INFO L225 Difference]: With dead ends: 28 [2019-09-03 20:52:31,042 INFO L226 Difference]: Without dead ends: 24 [2019-09-03 20:52:31,043 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-03 20:52:31,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-09-03 20:52:31,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 19. [2019-09-03 20:52:31,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-03 20:52:31,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-09-03 20:52:31,050 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 18 [2019-09-03 20:52:31,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:52:31,051 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-09-03 20:52:31,051 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:52:31,051 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-09-03 20:52:31,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-03 20:52:31,059 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:52:31,060 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:52:31,060 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:52:31,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:52:31,061 INFO L82 PathProgramCache]: Analyzing trace with hash -684761303, now seen corresponding path program 1 times [2019-09-03 20:52:31,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:52:31,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:31,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:52:31,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:31,062 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:52:31,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:31,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:52:31,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:52:31,131 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:52:31,132 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2019-09-03 20:52:31,134 INFO L207 CegarAbsIntRunner]: [0], [4], [6], [11], [14], [25], [30], [33], [35], [43], [48], [51], [53], [59], [60], [61], [63] [2019-09-03 20:52:31,171 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 20:52:31,171 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)