/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 15:54:11,513 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 15:54:11,514 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 15:54:11,553 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 15:54:11,607 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 15:54:11,608 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 15:54:11,608 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 15:54:11,609 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 15:54:11,616 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 15:54:11,616 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 15:54:11,617 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 15:54:11,617 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 15:54:11,617 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 15:54:11,618 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 15:54:11,619 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 15:54:11,619 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 15:54:11,619 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 15:54:11,619 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 15:54:11,620 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 15:54:11,620 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 15:54:11,620 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 15:54:11,620 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:54:11,620 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 15:54:11,620 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 15:54:11,621 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 15:54:11,621 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 15:54:11,621 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 15:54:11,621 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 15:54:11,621 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 15:54:11,807 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 15:54:11,825 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 15:54:11,827 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 15:54:11,828 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 15:54:11,829 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 15:54:11,830 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound50.c [2022-04-06 15:54:11,891 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9461d6de7/08b8b4ad7e654fd1830495a58157ca6c/FLAG83b7fdba7 [2022-04-06 15:54:12,238 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 15:54:12,239 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound50.c [2022-04-06 15:54:12,244 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9461d6de7/08b8b4ad7e654fd1830495a58157ca6c/FLAG83b7fdba7 [2022-04-06 15:54:12,254 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9461d6de7/08b8b4ad7e654fd1830495a58157ca6c [2022-04-06 15:54:12,255 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 15:54:12,256 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 15:54:12,258 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 15:54:12,258 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 15:54:12,260 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 15:54:12,261 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,261 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69398885 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12, skipping insertion in model container [2022-04-06 15:54:12,262 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,267 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 15:54:12,279 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 15:54:12,434 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound50.c[525,538] [2022-04-06 15:54:12,463 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:54:12,471 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 15:54:12,482 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound50.c[525,538] [2022-04-06 15:54:12,497 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:54:12,515 INFO L208 MainTranslator]: Completed translation [2022-04-06 15:54:12,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12 WrapperNode [2022-04-06 15:54:12,516 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 15:54:12,517 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 15:54:12,517 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 15:54:12,517 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 15:54:12,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,529 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,534 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,535 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,539 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,542 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,543 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,551 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 15:54:12,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 15:54:12,552 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 15:54:12,552 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 15:54:12,553 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (1/1) ... [2022-04-06 15:54:12,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:54:12,566 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:54:12,575 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 15:54:12,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 15:54:12,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 15:54:12,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 15:54:12,603 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 15:54:12,603 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 15:54:12,603 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 15:54:12,603 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 15:54:12,603 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 15:54:12,603 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 15:54:12,603 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 15:54:12,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 15:54:12,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 15:54:12,605 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 15:54:12,605 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 15:54:12,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 15:54:12,652 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 15:54:12,653 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 15:54:12,802 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 15:54:12,808 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 15:54:12,808 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 15:54:12,809 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:54:12 BoogieIcfgContainer [2022-04-06 15:54:12,809 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 15:54:12,811 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 15:54:12,811 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 15:54:12,814 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 15:54:12,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 03:54:12" (1/3) ... [2022-04-06 15:54:12,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51a3537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:54:12, skipping insertion in model container [2022-04-06 15:54:12,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:54:12" (2/3) ... [2022-04-06 15:54:12,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51a3537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:54:12, skipping insertion in model container [2022-04-06 15:54:12,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:54:12" (3/3) ... [2022-04-06 15:54:12,816 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_valuebound50.c [2022-04-06 15:54:12,819 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 15:54:12,820 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 15:54:12,856 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 15:54:12,863 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 15:54:12,863 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 15:54:12,875 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 15:54:12,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-06 15:54:12,883 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:12,883 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:12,884 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:12,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:12,888 INFO L85 PathProgramCache]: Analyzing trace with hash 223850557, now seen corresponding path program 1 times [2022-04-06 15:54:12,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:12,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [82042498] [2022-04-06 15:54:12,908 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:12,908 INFO L85 PathProgramCache]: Analyzing trace with hash 223850557, now seen corresponding path program 2 times [2022-04-06 15:54:12,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:12,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353740290] [2022-04-06 15:54:12,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:12,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:12,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:13,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:54:13,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:13,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:54:13,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:13,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-04-06 15:54:13,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:13,118 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 15:54:13,119 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:54:13,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353740290] [2022-04-06 15:54:13,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353740290] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:13,120 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:13,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:54:13,122 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:54:13,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [82042498] [2022-04-06 15:54:13,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [82042498] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:13,123 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:13,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:54:13,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534246235] [2022-04-06 15:54:13,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:54:13,127 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 15:54:13,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:13,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 15:54:13,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:54:13,158 INFO L87 Difference]: Start difference. First operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 15:54:15,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:15,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:54:15,333 INFO L93 Difference]: Finished difference Result 69 states and 113 transitions. [2022-04-06 15:54:15,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 15:54:15,336 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-04-06 15:54:15,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:54:15,342 INFO L225 Difference]: With dead ends: 69 [2022-04-06 15:54:15,342 INFO L226 Difference]: Without dead ends: 33 [2022-04-06 15:54:15,349 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:54:15,352 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:54:15,353 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 42 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 11 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2022-04-06 15:54:15,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-06 15:54:15,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-04-06 15:54:15,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-04-06 15:54:15,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-04-06 15:54:15,382 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2022-04-06 15:54:15,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:54:15,382 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-04-06 15:54:15,383 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 15:54:15,391 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-04-06 15:54:15,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 15:54:15,394 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:15,395 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:15,395 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 15:54:15,395 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:15,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:15,398 INFO L85 PathProgramCache]: Analyzing trace with hash -563604624, now seen corresponding path program 1 times [2022-04-06 15:54:15,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:15,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1051346724] [2022-04-06 15:54:15,405 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:15,405 INFO L85 PathProgramCache]: Analyzing trace with hash -563604624, now seen corresponding path program 2 times [2022-04-06 15:54:15,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:15,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456374130] [2022-04-06 15:54:15,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:15,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:15,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:15,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:54:15,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:15,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:54:15,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:15,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-04-06 15:54:15,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 15:54:15,692 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:54:15,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456374130] [2022-04-06 15:54:15,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456374130] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:15,693 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:15,693 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:54:15,693 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:54:15,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1051346724] [2022-04-06 15:54:15,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1051346724] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:15,694 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:15,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:54:15,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332548459] [2022-04-06 15:54:15,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:54:15,695 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 15:54:15,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:15,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 15:54:15,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-04-06 15:54:15,696 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 15:54:17,903 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:20,184 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:22,187 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:24,234 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:27,052 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:29,075 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:31,484 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:33,486 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:35,488 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:37,562 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:37,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:54:37,738 INFO L93 Difference]: Finished difference Result 68 states and 98 transitions. [2022-04-06 15:54:37,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:54:37,739 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2022-04-06 15:54:37,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:54:37,740 INFO L225 Difference]: With dead ends: 68 [2022-04-06 15:54:37,740 INFO L226 Difference]: Without dead ends: 48 [2022-04-06 15:54:37,741 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:54:37,742 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 34 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 49 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.9s IncrementalHoareTripleChecker+Time [2022-04-06 15:54:37,743 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 60 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 195 Invalid, 10 Unknown, 0 Unchecked, 21.9s Time] [2022-04-06 15:54:37,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-04-06 15:54:37,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-04-06 15:54:37,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 20 states have call successors, (20), 5 states have call predecessors, (20), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-04-06 15:54:37,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-04-06 15:54:37,759 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 24 [2022-04-06 15:54:37,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:54:37,759 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-04-06 15:54:37,760 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 15:54:37,760 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-04-06 15:54:37,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-04-06 15:54:37,760 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:37,760 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:37,761 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 15:54:37,761 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:37,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:37,761 INFO L85 PathProgramCache]: Analyzing trace with hash -5094773, now seen corresponding path program 1 times [2022-04-06 15:54:37,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:37,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1777540930] [2022-04-06 15:54:37,762 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:37,762 INFO L85 PathProgramCache]: Analyzing trace with hash -5094773, now seen corresponding path program 2 times [2022-04-06 15:54:37,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:37,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699379079] [2022-04-06 15:54:37,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:37,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:37,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:37,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:54:37,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:37,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:54:37,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:37,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-04-06 15:54:37,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:54:37,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 15:54:37,892 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:54:37,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699379079] [2022-04-06 15:54:37,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699379079] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:37,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:37,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:54:37,893 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:54:37,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1777540930] [2022-04-06 15:54:37,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1777540930] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:37,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:37,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:54:37,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083399108] [2022-04-06 15:54:37,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:54:37,894 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 15:54:37,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:37,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 15:54:37,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-04-06 15:54:37,895 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 15:54:40,823 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:54:44,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:54:44,392 INFO L93 Difference]: Finished difference Result 77 states and 112 transitions. [2022-04-06 15:54:44,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:54:44,393 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-04-06 15:54:44,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:54:44,396 INFO L225 Difference]: With dead ends: 77 [2022-04-06 15:54:44,396 INFO L226 Difference]: Without dead ends: 71 [2022-04-06 15:54:44,397 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:54:44,398 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 37 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 82 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-04-06 15:54:44,398 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 48 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 226 Invalid, 1 Unknown, 0 Unchecked, 6.4s Time] [2022-04-06 15:54:44,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-04-06 15:54:44,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 63. [2022-04-06 15:54:44,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 27 states have call successors, (27), 6 states have call predecessors, (27), 5 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-04-06 15:54:44,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 88 transitions. [2022-04-06 15:54:44,417 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 88 transitions. Word has length 26 [2022-04-06 15:54:44,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:54:44,417 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 88 transitions. [2022-04-06 15:54:44,417 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 15:54:44,418 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 88 transitions. [2022-04-06 15:54:44,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-04-06 15:54:44,418 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:44,419 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:44,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 15:54:44,419 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:44,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:44,419 INFO L85 PathProgramCache]: Analyzing trace with hash -2000886032, now seen corresponding path program 1 times [2022-04-06 15:54:44,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:44,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [293072309] [2022-04-06 15:54:44,420 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:44,420 INFO L85 PathProgramCache]: Analyzing trace with hash -2000886032, now seen corresponding path program 2 times [2022-04-06 15:54:44,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:44,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524346089] [2022-04-06 15:54:44,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:44,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:44,432 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:54:44,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2039870982] [2022-04-06 15:54:44,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:54:44,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:54:44,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:54:44,441 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:54:44,467 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 15:54:44,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:54:44,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:54:44,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 15:54:44,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:54:44,697 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-04-06 15:54:44,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 15:54:44,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:54:44,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524346089] [2022-04-06 15:54:44,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:54:44,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039870982] [2022-04-06 15:54:44,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039870982] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:44,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:44,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:54:44,698 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:54:44,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [293072309] [2022-04-06 15:54:44,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [293072309] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:44,699 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:44,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:54:44,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571328951] [2022-04-06 15:54:44,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:54:44,700 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 15:54:44,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:44,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 15:54:44,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 15:54:44,700 INFO L87 Difference]: Start difference. First operand 63 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 15:54:47,135 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:47,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:54:47,183 INFO L93 Difference]: Finished difference Result 74 states and 97 transitions. [2022-04-06 15:54:47,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 15:54:47,183 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2022-04-06 15:54:47,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:54:47,186 INFO L225 Difference]: With dead ends: 74 [2022-04-06 15:54:47,186 INFO L226 Difference]: Without dead ends: 51 [2022-04-06 15:54:47,186 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 15:54:47,187 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-04-06 15:54:47,188 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 144 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2022-04-06 15:54:47,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-04-06 15:54:47,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-04-06 15:54:47,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 21 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 15:54:47,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2022-04-06 15:54:47,200 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 34 [2022-04-06 15:54:47,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:54:47,200 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2022-04-06 15:54:47,200 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 15:54:47,201 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2022-04-06 15:54:47,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-04-06 15:54:47,201 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:47,201 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:47,218 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 15:54:47,415 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:54:47,416 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:47,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:47,416 INFO L85 PathProgramCache]: Analyzing trace with hash -965267381, now seen corresponding path program 1 times [2022-04-06 15:54:47,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:47,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [886542378] [2022-04-06 15:54:47,417 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:47,417 INFO L85 PathProgramCache]: Analyzing trace with hash -965267381, now seen corresponding path program 2 times [2022-04-06 15:54:47,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:47,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245459028] [2022-04-06 15:54:47,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:47,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:47,429 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:54:47,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654602664] [2022-04-06 15:54:47,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:54:47,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:54:47,430 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:54:47,431 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:54:47,450 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 15:54:47,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:54:47,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:54:47,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 15:54:47,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:54:47,636 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-06 15:54:47,637 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 15:54:47,637 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:54:47,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245459028] [2022-04-06 15:54:47,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:54:47,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654602664] [2022-04-06 15:54:47,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654602664] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:47,638 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:47,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:54:47,638 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:54:47,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [886542378] [2022-04-06 15:54:47,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [886542378] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:54:47,639 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:54:47,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:54:47,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863942293] [2022-04-06 15:54:47,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:54:47,639 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 15:54:47,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:47,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 15:54:47,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 15:54:47,640 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 15:54:50,070 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:54:50,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:54:50,716 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-04-06 15:54:50,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 15:54:50,717 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2022-04-06 15:54:50,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:54:50,718 INFO L225 Difference]: With dead ends: 68 [2022-04-06 15:54:50,718 INFO L226 Difference]: Without dead ends: 65 [2022-04-06 15:54:50,719 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 15:54:50,719 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:54:50,720 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2022-04-06 15:54:50,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-04-06 15:54:50,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-04-06 15:54:50,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 26 states have call successors, (26), 7 states have call predecessors, (26), 6 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-04-06 15:54:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 87 transitions. [2022-04-06 15:54:50,734 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 87 transitions. Word has length 36 [2022-04-06 15:54:50,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:54:50,734 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 87 transitions. [2022-04-06 15:54:50,734 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 15:54:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 87 transitions. [2022-04-06 15:54:50,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-04-06 15:54:50,736 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:54:50,736 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:54:50,745 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-04-06 15:54:50,941 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:54:50,941 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:54:50,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:54:50,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1670386034, now seen corresponding path program 1 times [2022-04-06 15:54:50,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:54:50,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1729152810] [2022-04-06 15:54:50,943 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:54:50,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1670386034, now seen corresponding path program 2 times [2022-04-06 15:54:50,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:54:50,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802113280] [2022-04-06 15:54:50,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:54:50,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:54:50,959 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:54:50,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1136358759] [2022-04-06 15:54:50,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:54:50,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:54:50,959 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:54:50,960 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:54:50,987 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process