/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 21:31:49,768 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 21:31:49,780 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 21:31:49,816 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 21:31:49,861 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 21:31:49,861 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 21:31:49,863 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 21:31:49,863 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 21:31:49,871 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 21:31:49,872 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 21:31:49,873 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 21:31:49,873 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 21:31:49,874 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 21:31:49,874 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 21:31:49,874 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 21:31:49,875 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 21:31:49,875 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 21:31:49,875 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 21:31:49,875 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 21:31:49,875 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 21:31:49,875 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 21:31:50,058 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 21:31:50,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 21:31:50,079 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 21:31:50,080 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 21:31:50,082 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 21:31:50,083 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound20.c [2022-03-20 21:31:50,119 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f4fb66a/208eb8be6d2647fd87ff379b37177360/FLAG3eb4ee7d1 [2022-03-20 21:31:50,480 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 21:31:50,481 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound20.c [2022-03-20 21:31:50,486 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f4fb66a/208eb8be6d2647fd87ff379b37177360/FLAG3eb4ee7d1 [2022-03-20 21:31:50,497 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f4fb66a/208eb8be6d2647fd87ff379b37177360 [2022-03-20 21:31:50,499 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 21:31:50,500 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 21:31:50,503 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 21:31:50,503 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 21:31:50,505 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 21:31:50,506 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,507 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d276f1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50, skipping insertion in model container [2022-03-20 21:31:50,507 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,512 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 21:31:50,526 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 21:31:50,667 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/hard-ll_valuebound20.c[538,551] [2022-03-20 21:31:50,685 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 21:31:50,693 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 21:31:50,701 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/hard-ll_valuebound20.c[538,551] [2022-03-20 21:31:50,716 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 21:31:50,726 INFO L208 MainTranslator]: Completed translation [2022-03-20 21:31:50,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50 WrapperNode [2022-03-20 21:31:50,726 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 21:31:50,728 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 21:31:50,728 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 21:31:50,728 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 21:31:50,735 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,736 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,749 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,754 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,760 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,762 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 21:31:50,763 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 21:31:50,763 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 21:31:50,763 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 21:31:50,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (1/1) ... [2022-03-20 21:31:50,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 21:31:50,775 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:50,784 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) [2022-03-20 21:31:50,803 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 [2022-03-20 21:31:50,830 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 21:31:50,830 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 21:31:50,830 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 21:31:50,830 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 21:31:50,830 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 21:31:50,831 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 21:31:50,831 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 21:31:50,831 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 21:31:50,831 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 21:31:50,831 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 21:31:50,831 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 21:31:50,832 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 21:31:50,832 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 21:31:50,832 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 21:31:50,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 21:31:50,883 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 21:31:50,885 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 21:31:50,982 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 21:31:50,993 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 21:31:50,993 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 21:31:51,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 09:31:51 BoogieIcfgContainer [2022-03-20 21:31:51,004 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 21:31:51,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 21:31:51,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 21:31:51,012 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 21:31:51,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 09:31:50" (1/3) ... [2022-03-20 21:31:51,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6881ba1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 09:31:51, skipping insertion in model container [2022-03-20 21:31:51,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:31:50" (2/3) ... [2022-03-20 21:31:51,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6881ba1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 09:31:51, skipping insertion in model container [2022-03-20 21:31:51,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 09:31:51" (3/3) ... [2022-03-20 21:31:51,019 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound20.c [2022-03-20 21:31:51,022 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 21:31:51,022 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 21:31:51,059 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 21:31:51,064 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 [2022-03-20 21:31:51,065 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 21:31:51,074 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 21:31:51,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 21:31:51,078 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:51,078 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:31:51,079 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:51,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:51,082 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 1 times [2022-03-20 21:31:51,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [193673984] [2022-03-20 21:31:51,095 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:51,095 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 2 times [2022-03-20 21:31:51,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:51,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365168807] [2022-03-20 21:31:51,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:51,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:51,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:31:51,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:31:51,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:31:51,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:31:51,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,291 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:31:51,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:51,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365168807] [2022-03-20 21:31:51,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365168807] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 21:31:51,294 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:51,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [193673984] [2022-03-20 21:31:51,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [193673984] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,295 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 21:31:51,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570600183] [2022-03-20 21:31:51,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:51,298 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 21:31:51,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 21:31:51,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 21:31:51,320 INFO L87 Difference]: Start difference. First operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 21:31:51,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:51,412 INFO L93 Difference]: Finished difference Result 69 states and 110 transitions. [2022-03-20 21:31:51,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 21:31:51,414 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-03-20 21:31:51,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:51,419 INFO L225 Difference]: With dead ends: 69 [2022-03-20 21:31:51,419 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 21:31:51,422 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 21:31:51,425 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:51,426 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:31:51,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 21:31:51,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 21:31:51,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:31:51,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-03-20 21:31:51,461 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 28 [2022-03-20 21:31:51,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:51,461 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-03-20 21:31:51,461 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 21:31:51,462 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-03-20 21:31:51,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 21:31:51,463 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:51,463 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:31:51,463 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 21:31:51,463 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:51,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:51,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 1 times [2022-03-20 21:31:51,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1579402594] [2022-03-20 21:31:51,467 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:51,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 2 times [2022-03-20 21:31:51,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:51,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586563129] [2022-03-20 21:31:51,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:51,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:51,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:31:51,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:31:51,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:31:51,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:31:51,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,609 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:31:51,610 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:51,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586563129] [2022-03-20 21:31:51,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586563129] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:31:51,611 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:51,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1579402594] [2022-03-20 21:31:51,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1579402594] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,612 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:31:51,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904584656] [2022-03-20 21:31:51,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:51,613 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:31:51,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:31:51,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:31:51,613 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 21:31:51,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:51,786 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-03-20 21:31:51,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 21:31:51,786 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-03-20 21:31:51,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:51,788 INFO L225 Difference]: With dead ends: 46 [2022-03-20 21:31:51,788 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 21:31:51,789 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:31:51,791 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:51,791 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 48 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:31:51,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 21:31:51,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-03-20 21:31:51,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:31:51,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2022-03-20 21:31:51,808 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 28 [2022-03-20 21:31:51,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:51,808 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2022-03-20 21:31:51,809 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 21:31:51,809 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2022-03-20 21:31:51,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 21:31:51,809 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:51,809 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:31:51,810 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 21:31:51,810 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:51,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:51,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 1 times [2022-03-20 21:31:51,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [933699413] [2022-03-20 21:31:51,811 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:51,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 2 times [2022-03-20 21:31:51,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:51,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558224911] [2022-03-20 21:31:51,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:51,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:51,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:31:51,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:31:51,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:31:51,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:31:51,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-20 21:31:51,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:31:51,899 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:31:51,899 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:51,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558224911] [2022-03-20 21:31:51,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558224911] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:31:51,900 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:51,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [933699413] [2022-03-20 21:31:51,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [933699413] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:51,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:51,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:31:51,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063044993] [2022-03-20 21:31:51,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:51,901 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:31:51,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:51,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:31:51,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:31:51,902 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 21:31:52,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:52,057 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2022-03-20 21:31:52,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 21:31:52,058 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 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 33 [2022-03-20 21:31:52,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:52,059 INFO L225 Difference]: With dead ends: 50 [2022-03-20 21:31:52,059 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 21:31:52,059 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:31:52,060 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 33 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:52,060 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 48 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:31:52,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 21:31:52,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-20 21:31:52,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:31:52,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-20 21:31:52,069 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-03-20 21:31:52,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:52,070 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-20 21:31:52,070 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 21:31:52,070 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-20 21:31:52,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 21:31:52,071 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:52,071 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:31:52,071 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 21:31:52,071 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:52,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:52,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 1 times [2022-03-20 21:31:52,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:52,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [704831452] [2022-03-20 21:31:52,072 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:52,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 2 times [2022-03-20 21:31:52,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:52,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575189185] [2022-03-20 21:31:52,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:52,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:52,083 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:52,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2130833715] [2022-03-20 21:31:52,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:52,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:52,084 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:52,085 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) [2022-03-20 21:31:52,094 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 21:31:52,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:52,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:52,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 21:31:52,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:52,312 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 21:31:52,312 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 21:31:52,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:52,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575189185] [2022-03-20 21:31:52,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:52,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130833715] [2022-03-20 21:31:52,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130833715] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:52,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:52,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:31:52,313 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:52,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [704831452] [2022-03-20 21:31:52,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [704831452] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:52,314 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:52,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:31:52,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344475938] [2022-03-20 21:31:52,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:52,314 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:31:52,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:52,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:31:52,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 21:31:52,315 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 21:31:52,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:52,365 INFO L93 Difference]: Finished difference Result 69 states and 89 transitions. [2022-03-20 21:31:52,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:31:52,366 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 38 [2022-03-20 21:31:52,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:52,367 INFO L225 Difference]: With dead ends: 69 [2022-03-20 21:31:52,368 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 21:31:52,368 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:31:52,369 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 8 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:52,370 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 157 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:31:52,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 21:31:52,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 21:31:52,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 21:31:52,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2022-03-20 21:31:52,379 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 38 [2022-03-20 21:31:52,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:52,379 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2022-03-20 21:31:52,379 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 21:31:52,379 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2022-03-20 21:31:52,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 21:31:52,380 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:52,380 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 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] [2022-03-20 21:31:52,399 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:52,595 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 [2022-03-20 21:31:52,595 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:52,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:52,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 1 times [2022-03-20 21:31:52,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:52,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [41823527] [2022-03-20 21:31:52,596 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:52,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 2 times [2022-03-20 21:31:52,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:52,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264090718] [2022-03-20 21:31:52,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:52,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:52,603 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:52,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1640252162] [2022-03-20 21:31:52,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:52,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:52,604 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:52,608 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) [2022-03-20 21:31:52,624 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 21:31:52,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:52,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:52,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 21:31:52,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:52,877 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 21:31:52,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:31:53,020 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 21:31:53,021 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:53,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264090718] [2022-03-20 21:31:53,021 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:53,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640252162] [2022-03-20 21:31:53,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640252162] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 21:31:53,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:31:53,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-03-20 21:31:53,021 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:53,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [41823527] [2022-03-20 21:31:53,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [41823527] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:53,022 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:53,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:31:53,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367633835] [2022-03-20 21:31:53,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:53,022 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:31:53,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:53,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:31:53,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 21:31:53,023 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:31:53,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:53,072 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-03-20 21:31:53,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:31:53,072 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 45 [2022-03-20 21:31:53,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:53,073 INFO L225 Difference]: With dead ends: 68 [2022-03-20 21:31:53,073 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 21:31:53,073 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-20 21:31:53,074 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 12 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:53,074 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 178 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:31:53,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 21:31:53,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 21:31:53,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 38 states have internal predecessors, (43), 20 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 21:31:53,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2022-03-20 21:31:53,084 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 45 [2022-03-20 21:31:53,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:53,084 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2022-03-20 21:31:53,084 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:31:53,084 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2022-03-20 21:31:53,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 21:31:53,086 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:53,086 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 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] [2022-03-20 21:31:53,105 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:53,291 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 [2022-03-20 21:31:53,292 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:53,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:53,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 1 times [2022-03-20 21:31:53,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:53,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [21117461] [2022-03-20 21:31:53,292 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:53,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 2 times [2022-03-20 21:31:53,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:53,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697330400] [2022-03-20 21:31:53,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:53,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:53,300 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:53,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [40665337] [2022-03-20 21:31:53,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:53,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:53,300 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:53,301 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) [2022-03-20 21:31:53,302 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 21:31:53,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:53,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:53,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 21:31:53,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:53,521 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-03-20 21:31:53,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:31:53,639 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-03-20 21:31:53,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:53,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697330400] [2022-03-20 21:31:53,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:53,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40665337] [2022-03-20 21:31:53,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40665337] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 21:31:53,640 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:31:53,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2022-03-20 21:31:53,640 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:53,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [21117461] [2022-03-20 21:31:53,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [21117461] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:53,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:53,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:31:53,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124175546] [2022-03-20 21:31:53,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:53,641 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:31:53,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:53,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:31:53,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:31:53,642 INFO L87 Difference]: Start difference. First operand 64 states and 80 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:31:53,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:53,692 INFO L93 Difference]: Finished difference Result 76 states and 95 transitions. [2022-03-20 21:31:53,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:31:53,693 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 55 [2022-03-20 21:31:53,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:53,694 INFO L225 Difference]: With dead ends: 76 [2022-03-20 21:31:53,694 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 21:31:53,694 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-20 21:31:53,694 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 8 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:53,694 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 141 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:31:53,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 21:31:53,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-03-20 21:31:53,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.175) internal successors, (47), 43 states have internal predecessors, (47), 22 states have call successors, (22), 9 states have call predecessors, (22), 8 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 21:31:53,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2022-03-20 21:31:53,704 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 55 [2022-03-20 21:31:53,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:53,704 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2022-03-20 21:31:53,704 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:31:53,704 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2022-03-20 21:31:53,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 21:31:53,705 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:53,705 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 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, 1, 1, 1] [2022-03-20 21:31:53,724 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:53,919 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:53,919 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:53,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:53,920 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 1 times [2022-03-20 21:31:53,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:53,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [117671341] [2022-03-20 21:31:53,920 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:53,920 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 2 times [2022-03-20 21:31:53,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:53,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531814557] [2022-03-20 21:31:53,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:53,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:53,927 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:53,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1213031053] [2022-03-20 21:31:53,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:53,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:53,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:53,931 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:31:53,935 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 21:31:53,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:53,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:53,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 21:31:53,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:54,075 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 21:31:54,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 21:31:54,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:54,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531814557] [2022-03-20 21:31:54,076 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:54,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213031053] [2022-03-20 21:31:54,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213031053] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:54,076 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:54,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:31:54,076 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:54,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [117671341] [2022-03-20 21:31:54,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [117671341] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:54,076 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:54,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:31:54,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148255126] [2022-03-20 21:31:54,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:54,078 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:31:54,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:54,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:31:54,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 21:31:54,078 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-03-20 21:31:54,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:54,119 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2022-03-20 21:31:54,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:31:54,119 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2022-03-20 21:31:54,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:54,123 INFO L225 Difference]: With dead ends: 79 [2022-03-20 21:31:54,123 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 21:31:54,123 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:31:54,124 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:54,124 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 132 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:31:54,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 21:31:54,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-03-20 21:31:54,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 41 states have (on average 1.146341463414634) internal successors, (47), 44 states have internal predecessors, (47), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 21:31:54,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-03-20 21:31:54,137 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 56 [2022-03-20 21:31:54,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:54,137 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-03-20 21:31:54,138 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-03-20 21:31:54,138 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-03-20 21:31:54,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 21:31:54,141 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:54,141 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 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] [2022-03-20 21:31:54,167 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:54,351 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:54,351 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:54,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:54,352 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 1 times [2022-03-20 21:31:54,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:54,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1072357810] [2022-03-20 21:31:54,352 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:54,352 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 2 times [2022-03-20 21:31:54,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:54,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223989458] [2022-03-20 21:31:54,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:54,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:54,359 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:54,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [348242375] [2022-03-20 21:31:54,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:54,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:54,359 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:54,360 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:31:54,361 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 21:31:54,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:54,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:54,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 21:31:54,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-03-20 21:31:54,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:31:55,977 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-03-20 21:31:55,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:55,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223989458] [2022-03-20 21:31:55,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:55,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348242375] [2022-03-20 21:31:55,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348242375] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:31:55,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:31:55,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 21:31:55,978 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:55,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1072357810] [2022-03-20 21:31:55,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1072357810] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:55,978 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:55,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 21:31:55,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449358506] [2022-03-20 21:31:55,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:55,979 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 21:31:55,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:55,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 21:31:55,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:31:55,979 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:31:56,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:56,132 INFO L93 Difference]: Finished difference Result 135 states and 165 transitions. [2022-03-20 21:31:56,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 21:31:56,133 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2022-03-20 21:31:56,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:56,134 INFO L225 Difference]: With dead ends: 135 [2022-03-20 21:31:56,134 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 21:31:56,134 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-03-20 21:31:56,135 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 10 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:56,135 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 326 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:31:56,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 21:31:56,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-03-20 21:31:56,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 64 states have (on average 1.140625) internal successors, (73), 67 states have internal predecessors, (73), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 21:31:56,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2022-03-20 21:31:56,146 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 75 [2022-03-20 21:31:56,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:56,146 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2022-03-20 21:31:56,146 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:31:56,146 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2022-03-20 21:31:56,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 21:31:56,147 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:56,147 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2022-03-20 21:31:56,175 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:56,361 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:56,362 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:56,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:56,362 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 3 times [2022-03-20 21:31:56,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:56,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [187315880] [2022-03-20 21:31:56,363 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:56,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 4 times [2022-03-20 21:31:56,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:56,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125135030] [2022-03-20 21:31:56,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:56,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:56,369 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:56,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [637029358] [2022-03-20 21:31:56,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:31:56,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:56,370 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:56,370 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:31:56,372 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 21:31:56,409 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:31:56,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:56,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 21:31:56,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:56,620 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-03-20 21:31:56,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:31:58,411 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-03-20 21:31:58,412 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:31:58,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125135030] [2022-03-20 21:31:58,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:31:58,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637029358] [2022-03-20 21:31:58,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637029358] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:31:58,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:31:58,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2022-03-20 21:31:58,412 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:31:58,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [187315880] [2022-03-20 21:31:58,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [187315880] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:31:58,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:31:58,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 21:31:58,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049089068] [2022-03-20 21:31:58,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:31:58,413 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 21:31:58,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:58,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 21:31:58,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 21:31:58,414 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-03-20 21:31:58,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:31:58,530 INFO L93 Difference]: Finished difference Result 133 states and 159 transitions. [2022-03-20 21:31:58,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 21:31:58,530 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 80 [2022-03-20 21:31:58,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:31:58,531 INFO L225 Difference]: With dead ends: 133 [2022-03-20 21:31:58,531 INFO L226 Difference]: Without dead ends: 110 [2022-03-20 21:31:58,532 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:31:58,532 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 11 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:31:58,532 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 265 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:31:58,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-20 21:31:58,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2022-03-20 21:31:58,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 66 states have (on average 1.106060606060606) internal successors, (73), 70 states have internal predecessors, (73), 28 states have call successors, (28), 16 states have call predecessors, (28), 15 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 21:31:58,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2022-03-20 21:31:58,542 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 80 [2022-03-20 21:31:58,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:31:58,542 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2022-03-20 21:31:58,542 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-03-20 21:31:58,542 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2022-03-20 21:31:58,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 21:31:58,543 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:31:58,543 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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] [2022-03-20 21:31:58,563 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:58,747 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:58,747 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:58,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:58,748 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 1 times [2022-03-20 21:31:58,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:58,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [465295495] [2022-03-20 21:31:58,748 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:58,749 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 2 times [2022-03-20 21:31:58,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:58,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700684629] [2022-03-20 21:31:58,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:58,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:58,755 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:58,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [930220935] [2022-03-20 21:31:58,755 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:31:58,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:58,755 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:58,760 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:31:58,761 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 21:31:58,800 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:31:58,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:58,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 21:31:58,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:59,848 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 21:31:59,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:32:13,045 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 21:32:13,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:32:13,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700684629] [2022-03-20 21:32:13,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:32:13,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930220935] [2022-03-20 21:32:13,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930220935] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:32:13,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:32:13,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-03-20 21:32:13,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:32:13,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [465295495] [2022-03-20 21:32:13,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [465295495] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:32:13,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:32:13,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 21:32:13,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102367849] [2022-03-20 21:32:13,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:32:13,049 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 21:32:13,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:32:13,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 21:32:13,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2022-03-20 21:32:13,050 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-03-20 21:32:14,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:32:14,006 INFO L93 Difference]: Finished difference Result 116 states and 131 transitions. [2022-03-20 21:32:14,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 21:32:14,007 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 86 [2022-03-20 21:32:14,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:32:14,008 INFO L225 Difference]: With dead ends: 116 [2022-03-20 21:32:14,008 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 21:32:14,008 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2022-03-20 21:32:14,008 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 17 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 21:32:14,009 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 342 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 21:32:14,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 21:32:14,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-03-20 21:32:14,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 55 states have internal predecessors, (58), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 21:32:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2022-03-20 21:32:14,019 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 86 [2022-03-20 21:32:14,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:32:14,019 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2022-03-20 21:32:14,019 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-03-20 21:32:14,019 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2022-03-20 21:32:14,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-03-20 21:32:14,020 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:32:14,020 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-03-20 21:32:14,036 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 21:32:14,220 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:32:14,221 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:32:14,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:32:14,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 5 times [2022-03-20 21:32:14,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:32:14,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [102809995] [2022-03-20 21:32:14,222 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:32:14,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 6 times [2022-03-20 21:32:14,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:32:14,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571869533] [2022-03-20 21:32:14,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:32:14,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:32:14,228 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:32:14,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [737119136] [2022-03-20 21:32:14,228 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:32:14,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:32:14,228 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:32:14,229 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:32:14,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 21:32:14,269 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 21:32:14,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:32:14,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 21:32:14,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:32:27,011 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-03-20 21:32:27,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:33:15,900 WARN L232 SmtUtils]: Spent 25.94s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:34:22,159 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 45 proven. 19 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-03-20 21:34:22,160 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:22,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571869533] [2022-03-20 21:34:22,160 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:22,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737119136] [2022-03-20 21:34:22,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737119136] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:34:22,160 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:34:22,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2022-03-20 21:34:22,160 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:22,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [102809995] [2022-03-20 21:34:22,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [102809995] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:22,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:22,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 21:34:22,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765236997] [2022-03-20 21:34:22,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:22,161 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 21:34:22,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:22,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 21:34:22,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=163, Unknown=1, NotChecked=0, Total=210 [2022-03-20 21:34:22,161 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:34:26,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:26,395 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-03-20 21:34:26,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 21:34:26,396 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 92 [2022-03-20 21:34:26,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:26,398 INFO L225 Difference]: With dead ends: 112 [2022-03-20 21:34:26,398 INFO L226 Difference]: Without dead ends: 100 [2022-03-20 21:34:26,398 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 35.2s TimeCoverageRelationStatistics Valid=59, Invalid=211, Unknown=2, NotChecked=0, Total=272 [2022-03-20 21:34:26,399 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 25 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:26,399 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 259 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 21:34:26,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-20 21:34:26,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2022-03-20 21:34:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 59 states have (on average 1.11864406779661) internal successors, (66), 63 states have internal predecessors, (66), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-20 21:34:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 116 transitions. [2022-03-20 21:34:26,416 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 116 transitions. Word has length 92 [2022-03-20 21:34:26,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:26,417 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 116 transitions. [2022-03-20 21:34:26,417 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:34:26,417 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 116 transitions. [2022-03-20 21:34:26,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 21:34:26,417 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:26,418 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-03-20 21:34:26,434 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 21:34:26,627 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 21:34:26,627 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:26,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:26,628 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 7 times [2022-03-20 21:34:26,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:26,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [644476351] [2022-03-20 21:34:26,628 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:26,628 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 8 times [2022-03-20 21:34:26,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:26,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229320986] [2022-03-20 21:34:26,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:26,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:26,634 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:26,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568271420] [2022-03-20 21:34:26,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:34:26,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:26,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:26,637 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:34:26,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 21:34:26,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:34:26,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:26,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 21:34:26,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:27,077 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-03-20 21:34:27,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:34:29,318 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-03-20 21:34:29,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:29,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229320986] [2022-03-20 21:34:29,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:29,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568271420] [2022-03-20 21:34:29,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568271420] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:34:29,319 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:34:29,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 21:34:29,319 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:29,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [644476351] [2022-03-20 21:34:29,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [644476351] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:29,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:29,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 21:34:29,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456897559] [2022-03-20 21:34:29,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:29,320 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 21:34:29,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:29,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 21:34:29,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:34:29,320 INFO L87 Difference]: Start difference. First operand 99 states and 116 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-03-20 21:34:29,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:29,617 INFO L93 Difference]: Finished difference Result 177 states and 223 transitions. [2022-03-20 21:34:29,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 21:34:29,618 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 97 [2022-03-20 21:34:29,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:29,619 INFO L225 Difference]: With dead ends: 177 [2022-03-20 21:34:29,619 INFO L226 Difference]: Without dead ends: 138 [2022-03-20 21:34:29,619 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-03-20 21:34:29,620 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 13 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:29,620 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 400 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:34:29,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-03-20 21:34:29,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-03-20 21:34:29,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 82 states have (on average 1.1219512195121952) internal successors, (92), 88 states have internal predecessors, (92), 39 states have call successors, (39), 17 states have call predecessors, (39), 16 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2022-03-20 21:34:29,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 167 transitions. [2022-03-20 21:34:29,632 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 167 transitions. Word has length 97 [2022-03-20 21:34:29,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:29,632 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 167 transitions. [2022-03-20 21:34:29,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-03-20 21:34:29,632 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 167 transitions. [2022-03-20 21:34:29,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 21:34:29,633 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:29,633 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:34:29,651 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 21:34:29,835 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:29,835 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:29,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:29,836 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 9 times [2022-03-20 21:34:29,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:29,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1131931019] [2022-03-20 21:34:29,836 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:29,836 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 10 times [2022-03-20 21:34:29,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:29,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913435335] [2022-03-20 21:34:29,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:29,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:29,845 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:29,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1000656574] [2022-03-20 21:34:29,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:34:29,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:29,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:29,848 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:34:29,850 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 21:34:29,891 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:34:29,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:29,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 21:34:29,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:31,049 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-03-20 21:34:31,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:16,944 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-03-20 21:35:16,944 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:16,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913435335] [2022-03-20 21:35:16,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:16,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000656574] [2022-03-20 21:35:16,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000656574] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:35:16,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:35:16,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2022-03-20 21:35:16,945 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:16,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1131931019] [2022-03-20 21:35:16,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1131931019] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:16,945 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:16,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 21:35:16,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901468778] [2022-03-20 21:35:16,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:16,945 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 21:35:16,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:16,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 21:35:16,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2022-03-20 21:35:16,946 INFO L87 Difference]: Start difference. First operand 138 states and 167 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-03-20 21:35:18,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:18,265 INFO L93 Difference]: Finished difference Result 184 states and 208 transitions. [2022-03-20 21:35:18,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 21:35:18,266 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 105 [2022-03-20 21:35:18,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:18,267 INFO L225 Difference]: With dead ends: 184 [2022-03-20 21:35:18,267 INFO L226 Difference]: Without dead ends: 147 [2022-03-20 21:35:18,267 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2022-03-20 21:35:18,268 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 17 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:18,269 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 511 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 21:35:18,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-03-20 21:35:18,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-03-20 21:35:18,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 95 states have internal predecessors, (98), 36 states have call successors, (36), 21 states have call predecessors, (36), 20 states have return successors, (33), 30 states have call predecessors, (33), 33 states have call successors, (33) [2022-03-20 21:35:18,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 167 transitions. [2022-03-20 21:35:18,281 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 167 transitions. Word has length 105 [2022-03-20 21:35:18,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:18,281 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 167 transitions. [2022-03-20 21:35:18,281 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-03-20 21:35:18,281 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 167 transitions. [2022-03-20 21:35:18,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-03-20 21:35:18,282 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:18,282 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:35:18,300 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 21:35:18,487 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 21:35:18,487 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:18,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:18,488 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 11 times [2022-03-20 21:35:18,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:18,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1069783861] [2022-03-20 21:35:18,489 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:18,489 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 12 times [2022-03-20 21:35:18,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:18,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662372193] [2022-03-20 21:35:18,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:18,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:18,494 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:18,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1540426624] [2022-03-20 21:35:18,494 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:35:18,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:18,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:18,507 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:35:18,512 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 21:35:18,581 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 21:35:18,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:18,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 21:35:18,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:35:18,996 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 96 proven. 4 refuted. 0 times theorem prover too weak. 395 trivial. 0 not checked. [2022-03-20 21:35:18,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:19,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:19,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662372193] [2022-03-20 21:35:19,300 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:19,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540426624] [2022-03-20 21:35:19,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540426624] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 21:35:19,300 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:35:19,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-03-20 21:35:19,301 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:19,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1069783861] [2022-03-20 21:35:19,301 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1069783861] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:19,301 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:19,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 21:35:19,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220859368] [2022-03-20 21:35:19,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:19,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 21:35:19,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:19,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 21:35:19,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-03-20 21:35:19,302 INFO L87 Difference]: Start difference. First operand 147 states and 167 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-03-20 21:35:19,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:19,712 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2022-03-20 21:35:19,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 21:35:19,713 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 114 [2022-03-20 21:35:19,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:19,714 INFO L225 Difference]: With dead ends: 168 [2022-03-20 21:35:19,714 INFO L226 Difference]: Without dead ends: 156 [2022-03-20 21:35:19,714 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-03-20 21:35:19,715 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 20 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:19,715 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 288 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 215 Invalid, 0 Unknown, 39 Unchecked, 0.3s Time] [2022-03-20 21:35:19,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-03-20 21:35:19,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2022-03-20 21:35:19,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 95 states have (on average 1.0842105263157895) internal successors, (103), 100 states have internal predecessors, (103), 38 states have call successors, (38), 22 states have call predecessors, (38), 21 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-03-20 21:35:19,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 176 transitions. [2022-03-20 21:35:19,727 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 176 transitions. Word has length 114 [2022-03-20 21:35:19,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:19,727 INFO L478 AbstractCegarLoop]: Abstraction has 155 states and 176 transitions. [2022-03-20 21:35:19,727 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-03-20 21:35:19,727 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 176 transitions. [2022-03-20 21:35:19,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-03-20 21:35:19,728 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:19,728 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:35:19,746 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 21:35:19,931 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 21:35:19,931 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:19,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:19,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 3 times [2022-03-20 21:35:19,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:19,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2113391127] [2022-03-20 21:35:19,932 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:19,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 4 times [2022-03-20 21:35:19,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:19,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037224798] [2022-03-20 21:35:19,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:19,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:19,938 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:19,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1054045981] [2022-03-20 21:35:19,938 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:35:19,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:19,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:19,939 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:35:19,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 21:35:19,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:35:19,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:19,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 21:35:19,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:35:20,645 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 21:35:20,744 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 71 proven. 29 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2022-03-20 21:35:20,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:20,819 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 21:35:32,633 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:32,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037224798] [2022-03-20 21:35:32,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:32,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054045981] [2022-03-20 21:35:32,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054045981] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 21:35:32,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:35:32,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-20 21:35:32,634 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:32,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2113391127] [2022-03-20 21:35:32,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2113391127] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:32,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:32,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 21:35:32,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807192607] [2022-03-20 21:35:32,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:32,634 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 21:35:32,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:32,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 21:35:32,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=503, Unknown=0, NotChecked=0, Total=650 [2022-03-20 21:35:32,635 INFO L87 Difference]: Start difference. First operand 155 states and 176 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-03-20 21:35:33,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:33,939 INFO L93 Difference]: Finished difference Result 161 states and 181 transitions. [2022-03-20 21:35:33,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 21:35:33,940 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) Word has length 116 [2022-03-20 21:35:33,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:33,941 INFO L225 Difference]: With dead ends: 161 [2022-03-20 21:35:33,941 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 21:35:33,941 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 168 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=160, Invalid=596, Unknown=0, NotChecked=0, Total=756 [2022-03-20 21:35:33,941 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 15 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:33,942 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 438 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 21:35:33,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 21:35:33,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-03-20 21:35:33,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 79 states have internal predecessors, (82), 31 states have call successors, (31), 18 states have call predecessors, (31), 17 states have return successors, (29), 26 states have call predecessors, (29), 29 states have call successors, (29) [2022-03-20 21:35:33,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2022-03-20 21:35:33,950 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 116 [2022-03-20 21:35:33,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:33,951 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2022-03-20 21:35:33,951 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-03-20 21:35:33,951 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2022-03-20 21:35:33,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-03-20 21:35:33,951 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:33,952 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2022-03-20 21:35:33,968 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-20 21:35:34,155 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 21:35:34,155 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:34,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:34,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 5 times [2022-03-20 21:35:34,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:34,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [905274406] [2022-03-20 21:35:34,157 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:34,157 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 6 times [2022-03-20 21:35:34,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:34,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313478923] [2022-03-20 21:35:34,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:34,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:34,167 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:34,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [718084981] [2022-03-20 21:35:34,168 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:35:34,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:34,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:34,176 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:35:34,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 21:35:34,239 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 21:35:34,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:34,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 21:35:34,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:35:34,487 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-03-20 21:35:34,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:34,689 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2022-03-20 21:35:34,689 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:34,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313478923] [2022-03-20 21:35:34,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:34,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718084981] [2022-03-20 21:35:34,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718084981] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:35:34,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:35:34,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2022-03-20 21:35:34,690 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:34,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [905274406] [2022-03-20 21:35:34,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [905274406] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:34,690 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:34,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:35:34,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443184546] [2022-03-20 21:35:34,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:34,691 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:35:34,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:34,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:35:34,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:35:34,691 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-03-20 21:35:34,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:34,750 INFO L93 Difference]: Finished difference Result 150 states and 178 transitions. [2022-03-20 21:35:34,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 21:35:34,750 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 120 [2022-03-20 21:35:34,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:34,751 INFO L225 Difference]: With dead ends: 150 [2022-03-20 21:35:34,751 INFO L226 Difference]: Without dead ends: 137 [2022-03-20 21:35:34,751 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 230 SyntacticMatches, 5 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:35:34,752 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 20 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:34,752 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 112 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:35:34,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-03-20 21:35:34,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2022-03-20 21:35:34,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 83 states have (on average 1.108433734939759) internal successors, (92), 87 states have internal predecessors, (92), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (34), 31 states have call predecessors, (34), 34 states have call successors, (34) [2022-03-20 21:35:34,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 162 transitions. [2022-03-20 21:35:34,766 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 162 transitions. Word has length 120 [2022-03-20 21:35:34,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:34,766 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 162 transitions. [2022-03-20 21:35:34,766 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-03-20 21:35:34,767 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 162 transitions. [2022-03-20 21:35:34,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-03-20 21:35:34,767 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:34,767 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:35:34,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 21:35:34,984 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 21:35:34,984 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:34,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:34,985 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 13 times [2022-03-20 21:35:34,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:34,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1243233663] [2022-03-20 21:35:34,985 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:34,985 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 14 times [2022-03-20 21:35:34,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:34,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427342767] [2022-03-20 21:35:34,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:34,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:34,990 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:34,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [502287162] [2022-03-20 21:35:34,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:35:34,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:34,991 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:34,992 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:35:34,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 21:35:35,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:35:35,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:35,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-20 21:35:35,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:35:35,850 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 46 proven. 70 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-03-20 21:35:35,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:36:11,387 WARN L232 SmtUtils]: Spent 9.00s on a formula simplification that was a NOOP. DAG size: 142 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:36:48,894 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 46 proven. 70 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-03-20 21:36:48,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:36:48,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427342767] [2022-03-20 21:36:48,895 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:36:48,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502287162] [2022-03-20 21:36:48,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502287162] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:36:48,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:36:48,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 26 [2022-03-20 21:36:48,895 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:36:48,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1243233663] [2022-03-20 21:36:48,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1243233663] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:36:48,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:36:48,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 21:36:48,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138222519] [2022-03-20 21:36:48,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:36:48,896 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 21:36:48,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:36:48,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 21:36:48,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2022-03-20 21:36:48,896 INFO L87 Difference]: Start difference. First operand 137 states and 162 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 21:36:50,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:36:50,011 INFO L93 Difference]: Finished difference Result 241 states and 293 transitions. [2022-03-20 21:36:50,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 21:36:50,011 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 122 [2022-03-20 21:36:50,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:36:50,013 INFO L225 Difference]: With dead ends: 241 [2022-03-20 21:36:50,013 INFO L226 Difference]: Without dead ends: 195 [2022-03-20 21:36:50,013 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 217 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-03-20 21:36:50,013 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 18 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 21:36:50,014 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 518 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 21:36:50,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-03-20 21:36:50,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 192. [2022-03-20 21:36:50,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 118 states have (on average 1.1101694915254237) internal successors, (131), 123 states have internal predecessors, (131), 49 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2022-03-20 21:36:50,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 227 transitions. [2022-03-20 21:36:50,029 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 227 transitions. Word has length 122 [2022-03-20 21:36:50,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:36:50,029 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 227 transitions. [2022-03-20 21:36:50,029 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 21:36:50,029 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 227 transitions. [2022-03-20 21:36:50,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-03-20 21:36:50,030 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:36:50,030 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:36:50,049 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 21:36:50,246 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:36:50,247 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:36:50,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:36:50,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 15 times [2022-03-20 21:36:50,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:36:50,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1175033335] [2022-03-20 21:36:50,247 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:36:50,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 16 times [2022-03-20 21:36:50,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:36:50,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656713514] [2022-03-20 21:36:50,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:36:50,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:36:50,253 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:36:50,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1817463190] [2022-03-20 21:36:50,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:36:50,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:36:50,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:36:50,255 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:36:50,256 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 21:36:50,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:36:50,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:36:50,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 21:36:50,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:36:50,699 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-03-20 21:36:50,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:37:06,110 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-03-20 21:37:06,110 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:37:06,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656713514] [2022-03-20 21:37:06,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:37:06,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817463190] [2022-03-20 21:37:06,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1817463190] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:37:06,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:37:06,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2022-03-20 21:37:06,111 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:37:06,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1175033335] [2022-03-20 21:37:06,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1175033335] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:37:06,111 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:37:06,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 21:37:06,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844705118] [2022-03-20 21:37:06,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:37:06,111 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 21:37:06,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:37:06,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 21:37:06,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2022-03-20 21:37:06,112 INFO L87 Difference]: Start difference. First operand 192 states and 227 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-03-20 21:37:06,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:37:06,427 INFO L93 Difference]: Finished difference Result 238 states and 285 transitions. [2022-03-20 21:37:06,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 21:37:06,428 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 127 [2022-03-20 21:37:06,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:37:06,429 INFO L225 Difference]: With dead ends: 238 [2022-03-20 21:37:06,429 INFO L226 Difference]: Without dead ends: 209 [2022-03-20 21:37:06,429 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2022-03-20 21:37:06,429 INFO L913 BasicCegarLoop]: 72 mSDtfsCounter, 12 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 21:37:06,429 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 574 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 21:37:06,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-03-20 21:37:06,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2022-03-20 21:37:06,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 128 states have (on average 1.1015625) internal successors, (141), 135 states have internal predecessors, (141), 52 states have call successors, (52), 27 states have call predecessors, (52), 26 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-03-20 21:37:06,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 242 transitions. [2022-03-20 21:37:06,446 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 242 transitions. Word has length 127 [2022-03-20 21:37:06,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:37:06,447 INFO L478 AbstractCegarLoop]: Abstraction has 207 states and 242 transitions. [2022-03-20 21:37:06,447 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-03-20 21:37:06,447 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 242 transitions. [2022-03-20 21:37:06,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-03-20 21:37:06,448 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:37:06,448 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:37:06,464 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 21:37:06,664 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 21:37:06,664 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:37:06,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:37:06,665 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 17 times [2022-03-20 21:37:06,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:37:06,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [363064201] [2022-03-20 21:37:06,665 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:37:06,665 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 18 times [2022-03-20 21:37:06,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:37:06,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685568785] [2022-03-20 21:37:06,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:37:06,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:37:06,671 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:37:06,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1488335778] [2022-03-20 21:37:06,671 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:37:06,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:37:06,671 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:37:06,672 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:37:06,673 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 21:37:06,920 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-03-20 21:37:06,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:37:06,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 83 conjunts are in the unsatisfiable core [2022-03-20 21:37:06,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:37:09,214 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful