/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 16:32:31,059 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 16:32:31,061 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 16:32:31,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 16:32:31,145 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 16:32:31,146 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 16:32:31,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 16:32:31,148 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 16:32:31,160 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 16:32:31,161 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 16:32:31,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 16:32:31,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 16:32:31,163 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 16:32:31,163 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 16:32:31,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 16:32:31,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 16:32:31,164 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 16:32:31,164 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 16:32:31,165 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 16:32:31,165 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 16:32:31,165 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 16:32:31,165 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 16:32:31,165 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 16:32:31,381 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 16:32:31,396 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 16:32:31,398 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 16:32:31,399 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 16:32:31,400 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 16:32:31,401 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_unwindbound50.c [2022-03-20 16:32:31,446 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4650b2b3/a2534aa42d3748049abe66b45dd6d57f/FLAGc2137d35a [2022-03-20 16:32:31,797 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 16:32:31,797 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_unwindbound50.c [2022-03-20 16:32:31,802 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4650b2b3/a2534aa42d3748049abe66b45dd6d57f/FLAGc2137d35a [2022-03-20 16:32:31,810 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4650b2b3/a2534aa42d3748049abe66b45dd6d57f [2022-03-20 16:32:31,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 16:32:31,813 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 16:32:31,815 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 16:32:31,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 16:32:31,817 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 16:32:31,817 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 04:32:31" (1/1) ... [2022-03-20 16:32:31,818 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c0c18c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:31, skipping insertion in model container [2022-03-20 16:32:31,818 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 04:32:31" (1/1) ... [2022-03-20 16:32:31,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 16:32:31,834 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 16:32:31,961 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/prodbin-ll_unwindbound50.c[537,550] [2022-03-20 16:32:31,982 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 16:32:31,988 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 16:32:31,997 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/prodbin-ll_unwindbound50.c[537,550] [2022-03-20 16:32:32,001 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 16:32:32,011 INFO L208 MainTranslator]: Completed translation [2022-03-20 16:32:32,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32 WrapperNode [2022-03-20 16:32:32,011 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 16:32:32,012 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 16:32:32,012 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 16:32:32,012 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 16:32:32,020 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,025 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,025 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,029 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,033 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 16:32:32,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 16:32:32,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 16:32:32,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 16:32:32,039 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (1/1) ... [2022-03-20 16:32:32,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 16:32:32,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:32,067 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 16:32:32,075 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 16:32:32,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 16:32:32,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 16:32:32,102 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 16:32:32,102 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 16:32:32,102 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 16:32:32,102 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 16:32:32,102 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 16:32:32,102 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 16:32:32,102 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 16:32:32,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 16:32:32,104 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 16:32:32,104 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 16:32:32,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 16:32:32,155 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 16:32:32,157 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 16:32:32,276 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 16:32:32,281 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 16:32:32,281 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 16:32:32,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 04:32:32 BoogieIcfgContainer [2022-03-20 16:32:32,283 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 16:32:32,288 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 16:32:32,289 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 16:32:32,292 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 16:32:32,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 04:32:31" (1/3) ... [2022-03-20 16:32:32,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2255aa74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 04:32:32, skipping insertion in model container [2022-03-20 16:32:32,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:32:32" (2/3) ... [2022-03-20 16:32:32,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2255aa74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 04:32:32, skipping insertion in model container [2022-03-20 16:32:32,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 04:32:32" (3/3) ... [2022-03-20 16:32:32,303 INFO L111 eAbstractionObserver]: Analyzing ICFG prodbin-ll_unwindbound50.c [2022-03-20 16:32:32,307 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 16:32:32,308 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 16:32:32,345 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 16:32:32,350 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 16:32:32,351 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 16:32:32,362 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:32:32,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 16:32:32,369 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:32,369 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:32,370 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:32,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:32,374 INFO L85 PathProgramCache]: Analyzing trace with hash -1523633710, now seen corresponding path program 1 times [2022-03-20 16:32:32,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:32,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [761782890] [2022-03-20 16:32:32,390 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:32,390 INFO L85 PathProgramCache]: Analyzing trace with hash -1523633710, now seen corresponding path program 2 times [2022-03-20 16:32:32,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:32,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350670067] [2022-03-20 16:32:32,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:32,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:32,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:32:32,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 16:32:32,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:32:32,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 16:32:32,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:32:32,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:32,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:32,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350670067] [2022-03-20 16:32:32,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350670067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:32,588 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:32,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 16:32:32,591 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:32,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [761782890] [2022-03-20 16:32:32,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [761782890] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:32,591 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:32,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 16:32:32,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632886374] [2022-03-20 16:32:32,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:32,596 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 16:32:32,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:32,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 16:32:32,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 16:32:32,621 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 16:32:32,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:32,712 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2022-03-20 16:32:32,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 16:32:32,714 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-20 16:32:32,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:32,725 INFO L225 Difference]: With dead ends: 52 [2022-03-20 16:32:32,726 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 16:32:32,728 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 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 16:32:32,734 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:32,736 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 35 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:32,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 16:32:32,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-03-20 16:32:32,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 16:32:32,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-03-20 16:32:32,783 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2022-03-20 16:32:32,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:32,783 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-03-20 16:32:32,783 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 16:32:32,783 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-03-20 16:32:32,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 16:32:32,784 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:32,785 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:32,785 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 16:32:32,785 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:32,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:32,787 INFO L85 PathProgramCache]: Analyzing trace with hash -991958694, now seen corresponding path program 1 times [2022-03-20 16:32:32,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:32,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [298407438] [2022-03-20 16:32:32,792 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:32,792 INFO L85 PathProgramCache]: Analyzing trace with hash -991958694, now seen corresponding path program 2 times [2022-03-20 16:32:32,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:32,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135096004] [2022-03-20 16:32:32,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:32,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:32,825 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:32,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [270542264] [2022-03-20 16:32:32,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:32,826 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:32,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:32,835 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 16:32:32,877 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 16:32:32,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 16:32:32,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:32,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 16:32:32,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:33,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:33,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 16:32:33,018 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:33,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135096004] [2022-03-20 16:32:33,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:33,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270542264] [2022-03-20 16:32:33,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270542264] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,019 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 16:32:33,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:33,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [298407438] [2022-03-20 16:32:33,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [298407438] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 16:32:33,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449003075] [2022-03-20 16:32:33,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:33,024 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 16:32:33,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:33,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 16:32:33,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 16:32:33,025 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 16:32:33,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:33,036 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-03-20 16:32:33,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 16:32:33,037 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2022-03-20 16:32:33,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:33,038 INFO L225 Difference]: With dead ends: 34 [2022-03-20 16:32:33,038 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 16:32:33,038 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 16:32:33,039 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:33,040 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 66 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:33,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 16:32:33,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 16:32:33,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 16:32:33,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-03-20 16:32:33,047 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 18 [2022-03-20 16:32:33,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:33,048 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-03-20 16:32:33,048 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 16:32:33,048 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-03-20 16:32:33,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 16:32:33,049 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:33,049 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:33,075 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 16:32:33,271 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:33,272 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:33,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:33,273 INFO L85 PathProgramCache]: Analyzing trace with hash -990171234, now seen corresponding path program 1 times [2022-03-20 16:32:33,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:33,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1851319597] [2022-03-20 16:32:33,273 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:33,274 INFO L85 PathProgramCache]: Analyzing trace with hash -990171234, now seen corresponding path program 2 times [2022-03-20 16:32:33,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:33,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996782200] [2022-03-20 16:32:33,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:33,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:33,286 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:33,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [714617265] [2022-03-20 16:32:33,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:33,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:33,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:33,288 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 16:32:33,322 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 16:32:33,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 16:32:33,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:33,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 16:32:33,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:33,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:33,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 16:32:33,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:33,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996782200] [2022-03-20 16:32:33,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:33,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714617265] [2022-03-20 16:32:33,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714617265] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:32:33,417 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:33,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1851319597] [2022-03-20 16:32:33,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1851319597] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:32:33,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763727381] [2022-03-20 16:32:33,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:33,418 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 16:32:33,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:33,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 16:32:33,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 16:32:33,419 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 16:32:33,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:33,460 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2022-03-20 16:32:33,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 16:32:33,460 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-03-20 16:32:33,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:33,461 INFO L225 Difference]: With dead ends: 38 [2022-03-20 16:32:33,461 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 16:32:33,462 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 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 16:32:33,463 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 8 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:33,463 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 80 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:33,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 16:32:33,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-03-20 16:32:33,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 16:32:33,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-03-20 16:32:33,471 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2022-03-20 16:32:33,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:33,471 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-03-20 16:32:33,471 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 16:32:33,472 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-03-20 16:32:33,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 16:32:33,472 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:33,472 INFO L499 BasicCegarLoop]: trace histogram [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 16:32:33,499 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 16:32:33,686 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 16:32:33,686 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:33,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:33,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1094479982, now seen corresponding path program 1 times [2022-03-20 16:32:33,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:33,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1578328436] [2022-03-20 16:32:33,688 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:33,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1094479982, now seen corresponding path program 2 times [2022-03-20 16:32:33,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:33,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401837113] [2022-03-20 16:32:33,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:33,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:33,706 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:33,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1126821372] [2022-03-20 16:32:33,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:33,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:33,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:33,710 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 16:32:33,745 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 16:32:33,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:33,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:33,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 16:32:33,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:33,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:33,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 16:32:33,871 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:33,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401837113] [2022-03-20 16:32:33,872 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:33,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126821372] [2022-03-20 16:32:33,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126821372] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 16:32:33,875 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:33,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1578328436] [2022-03-20 16:32:33,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1578328436] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:33,880 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:33,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 16:32:33,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558409721] [2022-03-20 16:32:33,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:33,881 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 16:32:33,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:33,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 16:32:33,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 16:32:33,882 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:33,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:33,939 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-03-20 16:32:33,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 16:32:33,940 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2022-03-20 16:32:33,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:33,940 INFO L225 Difference]: With dead ends: 42 [2022-03-20 16:32:33,940 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 16:32:33,941 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 16:32:33,942 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 17 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:33,942 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 94 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:33,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 16:32:33,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2022-03-20 16:32:33,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 16:32:33,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2022-03-20 16:32:33,949 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 24 [2022-03-20 16:32:33,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:33,949 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2022-03-20 16:32:33,949 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:33,949 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2022-03-20 16:32:33,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 16:32:33,950 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:33,950 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:33,974 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 16:32:34,150 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:34,151 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:34,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:34,151 INFO L85 PathProgramCache]: Analyzing trace with hash 584619061, now seen corresponding path program 1 times [2022-03-20 16:32:34,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:34,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1458898261] [2022-03-20 16:32:34,167 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:34,168 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:34,168 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:34,168 INFO L85 PathProgramCache]: Analyzing trace with hash 584619061, now seen corresponding path program 2 times [2022-03-20 16:32:34,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:34,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200183140] [2022-03-20 16:32:34,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:34,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:34,178 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:34,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [852657025] [2022-03-20 16:32:34,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:34,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:34,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:34,179 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 16:32:34,190 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 16:32:34,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:34,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:34,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 16:32:34,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:34,289 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:34,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:34,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:34,368 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:34,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200183140] [2022-03-20 16:32:34,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:34,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852657025] [2022-03-20 16:32:34,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852657025] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:34,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:34,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-20 16:32:34,369 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:34,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1458898261] [2022-03-20 16:32:34,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1458898261] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:34,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:34,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:32:34,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484495033] [2022-03-20 16:32:34,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:34,370 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 16:32:34,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:34,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 16:32:34,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-03-20 16:32:34,371 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 16:32:34,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:34,395 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-03-20 16:32:34,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 16:32:34,396 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2022-03-20 16:32:34,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:34,397 INFO L225 Difference]: With dead ends: 44 [2022-03-20 16:32:34,397 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 16:32:34,397 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-20 16:32:34,398 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 7 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:34,398 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 82 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:34,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 16:32:34,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 16:32:34,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 27 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 16:32:34,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2022-03-20 16:32:34,405 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2022-03-20 16:32:34,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:34,405 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2022-03-20 16:32:34,406 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 16:32:34,406 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2022-03-20 16:32:34,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 16:32:34,406 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:34,406 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:34,431 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 16:32:34,629 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:34,629 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:34,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:34,630 INFO L85 PathProgramCache]: Analyzing trace with hash 586406521, now seen corresponding path program 1 times [2022-03-20 16:32:34,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:34,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [46863813] [2022-03-20 16:32:34,634 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:34,634 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:34,634 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:34,634 INFO L85 PathProgramCache]: Analyzing trace with hash 586406521, now seen corresponding path program 2 times [2022-03-20 16:32:34,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:34,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006444728] [2022-03-20 16:32:34,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:34,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:34,643 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:34,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [594044248] [2022-03-20 16:32:34,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:34,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:34,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:34,645 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 16:32:34,649 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 16:32:34,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:34,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:34,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 16:32:34,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:35,154 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:35,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:36,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:36,305 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:36,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006444728] [2022-03-20 16:32:36,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:36,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594044248] [2022-03-20 16:32:36,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594044248] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:36,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:36,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2022-03-20 16:32:36,306 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:36,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [46863813] [2022-03-20 16:32:36,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [46863813] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:36,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:36,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:32:36,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297223145] [2022-03-20 16:32:36,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:36,307 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:32:36,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:36,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:32:36,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2022-03-20 16:32:36,308 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:36,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:36,500 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2022-03-20 16:32:36,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:32:36,500 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2022-03-20 16:32:36,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:36,501 INFO L225 Difference]: With dead ends: 55 [2022-03-20 16:32:36,501 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 16:32:36,502 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:32:36,503 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 33 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:36,503 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 159 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 16:32:36,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 16:32:36,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2022-03-20 16:32:36,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:32:36,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-03-20 16:32:36,511 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 28 [2022-03-20 16:32:36,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:36,511 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-03-20 16:32:36,511 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:36,512 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-03-20 16:32:36,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 16:32:36,512 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:36,512 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:36,540 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 16:32:36,737 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:36,738 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:36,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:36,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1395753147, now seen corresponding path program 1 times [2022-03-20 16:32:36,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:36,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [182592474] [2022-03-20 16:32:36,750 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:36,751 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:36,751 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:36,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1395753147, now seen corresponding path program 2 times [2022-03-20 16:32:36,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:36,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123440516] [2022-03-20 16:32:36,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:36,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:36,765 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:36,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [735465613] [2022-03-20 16:32:36,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:36,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:36,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:36,767 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 16:32:36,779 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 16:32:36,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:36,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:36,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 16:32:36,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:39,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:39,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:44,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:44,695 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:44,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123440516] [2022-03-20 16:32:44,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:44,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735465613] [2022-03-20 16:32:44,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735465613] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:44,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:44,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2022-03-20 16:32:44,696 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:44,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [182592474] [2022-03-20 16:32:44,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [182592474] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:44,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:44,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:32:44,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122116161] [2022-03-20 16:32:44,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:44,697 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:32:44,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:44,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:32:44,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=224, Unknown=1, NotChecked=0, Total=272 [2022-03-20 16:32:44,697 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 11 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:46,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:48,592 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:48,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:48,740 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-03-20 16:32:48,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:32:48,740 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 11 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2022-03-20 16:32:48,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:48,741 INFO L225 Difference]: With dead ends: 57 [2022-03-20 16:32:48,741 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 16:32:48,742 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=64, Invalid=315, Unknown=1, NotChecked=0, Total=380 [2022-03-20 16:32:48,742 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:48,742 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 172 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 204 Invalid, 1 Unknown, 0 Unchecked, 4.0s Time] [2022-03-20 16:32:48,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 16:32:48,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-03-20 16:32:48,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 38 states have internal predecessors, (41), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:32:48,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2022-03-20 16:32:48,752 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 28 [2022-03-20 16:32:48,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:48,752 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2022-03-20 16:32:48,752 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 11 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 16:32:48,752 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2022-03-20 16:32:48,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 16:32:48,753 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:48,753 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:48,776 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 16:32:48,953 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:48,954 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:48,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:48,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1513703477, now seen corresponding path program 1 times [2022-03-20 16:32:48,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:48,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [735015996] [2022-03-20 16:32:48,957 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:48,958 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:48,958 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:48,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1513703477, now seen corresponding path program 2 times [2022-03-20 16:32:48,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:48,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837176868] [2022-03-20 16:32:48,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:48,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:48,965 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:48,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [480627207] [2022-03-20 16:32:48,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:48,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:48,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:48,973 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 16:32:48,974 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 16:32:49,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:49,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:49,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 16:32:49,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:49,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:32:49,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:49,235 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:32:49,236 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:49,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837176868] [2022-03-20 16:32:49,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:49,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480627207] [2022-03-20 16:32:49,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480627207] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:49,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:49,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-20 16:32:49,237 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:49,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [735015996] [2022-03-20 16:32:49,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [735015996] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:49,237 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:49,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 16:32:49,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949291921] [2022-03-20 16:32:49,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:49,237 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 16:32:49,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:49,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 16:32:49,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 16:32:49,238 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 16:32:51,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:51,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:51,324 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2022-03-20 16:32:51,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:32:51,325 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 34 [2022-03-20 16:32:51,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:51,326 INFO L225 Difference]: With dead ends: 59 [2022-03-20 16:32:51,327 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 16:32:51,327 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:32:51,328 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:51,328 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 107 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2022-03-20 16:32:51,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 16:32:51,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2022-03-20 16:32:51,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:32:51,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2022-03-20 16:32:51,336 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 34 [2022-03-20 16:32:51,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:51,336 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2022-03-20 16:32:51,337 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 16:32:51,337 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2022-03-20 16:32:51,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:32:51,337 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:51,337 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:51,365 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 16:32:51,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:51,556 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:51,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:51,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1456887472, now seen corresponding path program 3 times [2022-03-20 16:32:51,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:51,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [15618551] [2022-03-20 16:32:51,559 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:51,559 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:51,559 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:51,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1456887472, now seen corresponding path program 4 times [2022-03-20 16:32:51,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:51,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442319236] [2022-03-20 16:32:51,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:51,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:51,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:51,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [300022970] [2022-03-20 16:32:51,573 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:32:51,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:51,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:51,574 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 16:32:51,576 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 16:32:51,622 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:32:51,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:51,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 16:32:51,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:51,716 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:32:51,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:51,809 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:32:51,809 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:51,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442319236] [2022-03-20 16:32:51,809 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:51,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300022970] [2022-03-20 16:32:51,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300022970] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:51,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:51,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-03-20 16:32:51,810 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:51,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [15618551] [2022-03-20 16:32:51,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [15618551] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:51,810 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:51,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 16:32:51,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288955750] [2022-03-20 16:32:51,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:51,811 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 16:32:51,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:51,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 16:32:51,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-03-20 16:32:51,811 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 16:32:51,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:51,852 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-20 16:32:51,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:32:51,853 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 38 [2022-03-20 16:32:51,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:51,855 INFO L225 Difference]: With dead ends: 54 [2022-03-20 16:32:51,855 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 16:32:51,855 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:32:51,857 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:51,857 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 81 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:51,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 16:32:51,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 16:32:51,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 35 states have internal predecessors, (39), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:32:51,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2022-03-20 16:32:51,896 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 38 [2022-03-20 16:32:51,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:51,897 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2022-03-20 16:32:51,897 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 16:32:51,897 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2022-03-20 16:32:51,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:32:51,898 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:51,899 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:51,924 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 16:32:52,111 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,SelfDestructingSolverStorable8 [2022-03-20 16:32:52,111 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:52,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:52,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1455100012, now seen corresponding path program 3 times [2022-03-20 16:32:52,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:52,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [853081157] [2022-03-20 16:32:52,115 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:52,115 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:52,115 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:52,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1455100012, now seen corresponding path program 4 times [2022-03-20 16:32:52,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:52,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174666915] [2022-03-20 16:32:52,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:52,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:52,123 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:52,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [349695874] [2022-03-20 16:32:52,123 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:32:52,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:52,123 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:52,125 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 16:32:52,126 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 16:32:52,166 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:32:52,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:52,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 16:32:52,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:32:54,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:32:57,100 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:57,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174666915] [2022-03-20 16:32:57,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:57,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349695874] [2022-03-20 16:32:57,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349695874] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:57,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:57,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2022-03-20 16:32:57,101 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:57,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [853081157] [2022-03-20 16:32:57,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [853081157] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:57,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:57,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:32:57,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235061057] [2022-03-20 16:32:57,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:57,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:32:57,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:57,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:32:57,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-03-20 16:32:57,103 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:32:57,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:57,284 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2022-03-20 16:32:57,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:32:57,285 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2022-03-20 16:32:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:57,285 INFO L225 Difference]: With dead ends: 70 [2022-03-20 16:32:57,285 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 16:32:57,286 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2022-03-20 16:32:57,286 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 27 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:57,286 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 164 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 16:32:57,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 16:32:57,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 65. [2022-03-20 16:32:57,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.125) internal successors, (54), 50 states have internal predecessors, (54), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:32:57,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2022-03-20 16:32:57,297 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 38 [2022-03-20 16:32:57,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:57,297 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2022-03-20 16:32:57,298 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:32:57,298 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2022-03-20 16:32:57,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:32:57,298 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:57,298 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:32:57,317 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 16:32:57,507 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 16:32:57,507 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:57,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:57,508 INFO L85 PathProgramCache]: Analyzing trace with hash -645753386, now seen corresponding path program 1 times [2022-03-20 16:32:57,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:57,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [959950786] [2022-03-20 16:32:57,515 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:32:57,515 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:32:57,515 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:32:57,515 INFO L85 PathProgramCache]: Analyzing trace with hash -645753386, now seen corresponding path program 2 times [2022-03-20 16:32:57,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:57,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924009097] [2022-03-20 16:32:57,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:57,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:57,522 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:57,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [24298477] [2022-03-20 16:32:57,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:57,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:57,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:57,523 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 16:32:57,531 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 16:32:57,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:57,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:57,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 16:32:57,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:02,397 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 16:33:02,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:06,351 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:33:06,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:06,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924009097] [2022-03-20 16:33:06,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:06,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24298477] [2022-03-20 16:33:06,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24298477] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:06,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:06,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 18 [2022-03-20 16:33:06,352 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:06,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [959950786] [2022-03-20 16:33:06,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [959950786] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:06,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:06,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:33:06,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507202434] [2022-03-20 16:33:06,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:06,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:33:06,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:06,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:33:06,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:33:06,354 INFO L87 Difference]: Start difference. First operand 65 states and 70 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:07,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:07,079 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2022-03-20 16:33:07,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:33:07,080 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2022-03-20 16:33:07,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:07,081 INFO L225 Difference]: With dead ends: 78 [2022-03-20 16:33:07,081 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 16:33:07,081 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2022-03-20 16:33:07,081 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 32 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:07,082 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 218 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 16:33:07,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 16:33:07,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 65. [2022-03-20 16:33:07,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.125) internal successors, (54), 50 states have internal predecessors, (54), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:33:07,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2022-03-20 16:33:07,092 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 38 [2022-03-20 16:33:07,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:07,092 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2022-03-20 16:33:07,092 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:07,092 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2022-03-20 16:33:07,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:33:07,093 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:07,093 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:33:07,116 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-03-20 16:33:07,306 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,SelfDestructingSolverStorable10 [2022-03-20 16:33:07,306 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:07,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:07,306 INFO L85 PathProgramCache]: Analyzing trace with hash 539044694, now seen corresponding path program 3 times [2022-03-20 16:33:07,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:07,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1385452672] [2022-03-20 16:33:07,310 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:33:07,310 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:33:07,310 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:33:07,310 INFO L85 PathProgramCache]: Analyzing trace with hash 539044694, now seen corresponding path program 4 times [2022-03-20 16:33:07,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:07,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392710769] [2022-03-20 16:33:07,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:07,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:07,317 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:07,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1026632012] [2022-03-20 16:33:07,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:33:07,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:07,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:07,326 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 16:33:07,327 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 16:33:07,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:33:07,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:07,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 16:33:07,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:11,351 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 16:33:11,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:20,329 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 16:33:20,329 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:20,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392710769] [2022-03-20 16:33:20,329 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:20,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026632012] [2022-03-20 16:33:20,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026632012] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:20,330 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:20,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 18 [2022-03-20 16:33:20,330 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:20,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1385452672] [2022-03-20 16:33:20,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1385452672] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:20,330 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:20,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:33:20,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629662786] [2022-03-20 16:33:20,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:20,330 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:33:20,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:20,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:33:20,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=244, Unknown=2, NotChecked=0, Total=306 [2022-03-20 16:33:20,331 INFO L87 Difference]: Start difference. First operand 65 states and 70 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:23,095 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:25,493 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:26,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:26,090 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2022-03-20 16:33:26,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:33:26,090 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2022-03-20 16:33:26,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:26,091 INFO L225 Difference]: With dead ends: 78 [2022-03-20 16:33:26,091 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 16:33:26,092 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=73, Invalid=305, Unknown=2, NotChecked=0, Total=380 [2022-03-20 16:33:26,092 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:26,092 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 223 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 208 Invalid, 2 Unknown, 0 Unchecked, 5.7s Time] [2022-03-20 16:33:26,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 16:33:26,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 65. [2022-03-20 16:33:26,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.125) internal successors, (54), 50 states have internal predecessors, (54), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:33:26,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2022-03-20 16:33:26,103 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 38 [2022-03-20 16:33:26,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:26,104 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2022-03-20 16:33:26,104 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:26,105 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2022-03-20 16:33:26,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:33:26,105 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:26,105 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:26,130 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 16:33:26,328 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,SelfDestructingSolverStorable11 [2022-03-20 16:33:26,328 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:26,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:26,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1348391320, now seen corresponding path program 3 times [2022-03-20 16:33:26,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:26,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1865877157] [2022-03-20 16:33:26,331 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:33:26,331 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:33:26,331 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:33:26,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1348391320, now seen corresponding path program 4 times [2022-03-20 16:33:26,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:26,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510287991] [2022-03-20 16:33:26,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:26,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:26,344 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:26,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1148397834] [2022-03-20 16:33:26,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:33:26,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:26,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:26,352 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 16:33:26,353 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 16:33:26,396 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:33:26,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:26,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 16:33:26,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:32,398 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 16:33:32,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:44,848 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 16:33:44,848 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:44,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510287991] [2022-03-20 16:33:44,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:44,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148397834] [2022-03-20 16:33:44,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148397834] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:44,849 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:44,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2022-03-20 16:33:44,849 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:44,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1865877157] [2022-03-20 16:33:44,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1865877157] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:44,849 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:44,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:33:44,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079894601] [2022-03-20 16:33:44,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:44,850 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:33:44,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:44,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:33:44,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=218, Unknown=2, NotChecked=0, Total=272 [2022-03-20 16:33:44,850 INFO L87 Difference]: Start difference. First operand 65 states and 70 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:47,923 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:47,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:47,995 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2022-03-20 16:33:47,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:33:47,995 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2022-03-20 16:33:47,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:47,996 INFO L225 Difference]: With dead ends: 76 [2022-03-20 16:33:47,996 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 16:33:47,996 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=65, Invalid=275, Unknown=2, NotChecked=0, Total=342 [2022-03-20 16:33:47,997 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:47,997 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 247 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-20 16:33:47,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 16:33:48,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2022-03-20 16:33:48,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 37 states have (on average 1.135135135135135) internal successors, (42), 39 states have internal predecessors, (42), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:33:48,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2022-03-20 16:33:48,007 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 38 [2022-03-20 16:33:48,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:48,007 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2022-03-20 16:33:48,007 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 16:33:48,007 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2022-03-20 16:33:48,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:33:48,009 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:48,009 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:48,026 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 16:33:48,215 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,SelfDestructingSolverStorable12 [2022-03-20 16:33:48,215 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:48,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:48,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1258071893, now seen corresponding path program 5 times [2022-03-20 16:33:48,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:48,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2142874258] [2022-03-20 16:33:48,217 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:33:48,217 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:33:48,218 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:33:48,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1258071893, now seen corresponding path program 6 times [2022-03-20 16:33:48,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:48,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12618877] [2022-03-20 16:33:48,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:48,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:48,224 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:48,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1758836871] [2022-03-20 16:33:48,225 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:33:48,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:48,225 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:48,226 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 16:33:48,228 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 16:33:48,285 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 16:33:48,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:48,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 16:33:48,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:48,369 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:33:48,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:48,466 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:33:48,466 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:48,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12618877] [2022-03-20 16:33:48,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:48,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758836871] [2022-03-20 16:33:48,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758836871] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:48,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:48,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-20 16:33:48,466 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:48,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2142874258] [2022-03-20 16:33:48,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2142874258] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:48,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:48,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 16:33:48,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508762219] [2022-03-20 16:33:48,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:48,467 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 16:33:48,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:48,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 16:33:48,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:33:48,468 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:33:48,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:48,513 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2022-03-20 16:33:48,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 16:33:48,513 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 48 [2022-03-20 16:33:48,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:48,516 INFO L225 Difference]: With dead ends: 64 [2022-03-20 16:33:48,517 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 16:33:48,517 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:33:48,517 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 17 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:48,518 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 96 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:33:48,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 16:33:48,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 16:33:48,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 43 states have internal predecessors, (48), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:33:48,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2022-03-20 16:33:48,528 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 48 [2022-03-20 16:33:48,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:48,528 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2022-03-20 16:33:48,529 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 16:33:48,529 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2022-03-20 16:33:48,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:33:48,529 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:48,529 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:48,545 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-20 16:33:48,730 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,SelfDestructingSolverStorable13 [2022-03-20 16:33:48,730 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:48,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:48,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1256284433, now seen corresponding path program 5 times [2022-03-20 16:33:48,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:48,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [120953489] [2022-03-20 16:33:48,732 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:33:48,732 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:33:48,732 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:33:48,732 INFO L85 PathProgramCache]: Analyzing trace with hash -1256284433, now seen corresponding path program 6 times [2022-03-20 16:33:48,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:48,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443795585] [2022-03-20 16:33:48,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:48,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:48,738 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:48,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1095910201] [2022-03-20 16:33:48,738 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:33:48,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:48,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:48,740 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 16:33:48,745 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 16:33:48,787 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 16:33:48,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:48,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 16:33:48,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:49,944 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:34:08,239 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:34:08,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:34:13,100 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:34:55,417 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:34:55,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443795585] [2022-03-20 16:34:55,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:34:55,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095910201] [2022-03-20 16:34:55,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095910201] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:34:55,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:34:55,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-03-20 16:34:55,418 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:34:55,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [120953489] [2022-03-20 16:34:55,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [120953489] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:34:55,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:34:55,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 16:34:55,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151166239] [2022-03-20 16:34:55,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:34:55,418 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 16:34:55,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:34:55,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 16:34:55,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=483, Unknown=3, NotChecked=0, Total=600 [2022-03-20 16:34:55,419 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:02,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:02,755 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2022-03-20 16:35:02,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 16:35:02,755 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 48 [2022-03-20 16:35:02,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:02,756 INFO L225 Difference]: With dead ends: 87 [2022-03-20 16:35:02,756 INFO L226 Difference]: Without dead ends: 85 [2022-03-20 16:35:02,756 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=186, Invalid=803, Unknown=3, NotChecked=0, Total=992 [2022-03-20 16:35:02,757 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 52 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:02,757 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 130 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 140 Invalid, 0 Unknown, 31 Unchecked, 3.5s Time] [2022-03-20 16:35:02,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-20 16:35:02,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-20 16:35:02,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 64 states have (on average 1.125) internal successors, (72), 66 states have internal predecessors, (72), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 16:35:02,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2022-03-20 16:35:02,770 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 48 [2022-03-20 16:35:02,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:02,770 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2022-03-20 16:35:02,771 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:02,771 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2022-03-20 16:35:02,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:35:02,771 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:02,771 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:02,796 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 16:35:02,991 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:02,991 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:02,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:02,991 INFO L85 PathProgramCache]: Analyzing trace with hash -446937807, now seen corresponding path program 5 times [2022-03-20 16:35:02,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:02,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1862862802] [2022-03-20 16:35:02,997 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:35:02,997 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:35:02,997 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:35:02,997 INFO L85 PathProgramCache]: Analyzing trace with hash -446937807, now seen corresponding path program 6 times [2022-03-20 16:35:02,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:02,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067976304] [2022-03-20 16:35:02,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:02,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:03,004 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:03,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [145022836] [2022-03-20 16:35:03,004 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:35:03,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:03,005 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:03,006 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 16:35:03,007 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 16:35:03,049 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 16:35:03,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:03,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 16:35:03,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:35:03,671 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:35:04,675 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 16:35:04,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:35:15,898 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 16:35:15,898 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:35:15,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067976304] [2022-03-20 16:35:15,899 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:35:15,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145022836] [2022-03-20 16:35:15,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145022836] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:35:15,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:35:15,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 21 [2022-03-20 16:35:15,899 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:35:15,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1862862802] [2022-03-20 16:35:15,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1862862802] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:35:15,899 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:35:15,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 16:35:15,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593287456] [2022-03-20 16:35:15,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:35:15,900 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 16:35:15,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:15,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 16:35:15,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=342, Unknown=2, NotChecked=0, Total=420 [2022-03-20 16:35:15,901 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:35:18,582 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:35:22,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:22,076 INFO L93 Difference]: Finished difference Result 120 states and 133 transitions. [2022-03-20 16:35:22,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 16:35:22,076 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 48 [2022-03-20 16:35:22,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:22,077 INFO L225 Difference]: With dead ends: 120 [2022-03-20 16:35:22,077 INFO L226 Difference]: Without dead ends: 118 [2022-03-20 16:35:22,077 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=93, Invalid=457, Unknown=2, NotChecked=0, Total=552 [2022-03-20 16:35:22,078 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 38 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:22,078 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 248 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 281 Invalid, 1 Unknown, 21 Unchecked, 3.8s Time] [2022-03-20 16:35:22,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-03-20 16:35:22,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 102. [2022-03-20 16:35:22,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 78 states have (on average 1.141025641025641) internal successors, (89), 81 states have internal predecessors, (89), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 16:35:22,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 113 transitions. [2022-03-20 16:35:22,095 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 113 transitions. Word has length 48 [2022-03-20 16:35:22,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:22,096 INFO L478 AbstractCegarLoop]: Abstraction has 102 states and 113 transitions. [2022-03-20 16:35:22,096 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:35:22,096 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 113 transitions. [2022-03-20 16:35:22,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:35:22,096 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:22,096 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:22,116 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-03-20 16:35:22,308 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,SelfDestructingSolverStorable15 [2022-03-20 16:35:22,308 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:22,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:22,308 INFO L85 PathProgramCache]: Analyzing trace with hash 737860273, now seen corresponding path program 7 times [2022-03-20 16:35:22,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:22,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [222932376] [2022-03-20 16:35:22,311 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:35:22,311 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:35:22,311 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:35:22,311 INFO L85 PathProgramCache]: Analyzing trace with hash 737860273, now seen corresponding path program 8 times [2022-03-20 16:35:22,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:22,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928976172] [2022-03-20 16:35:22,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:22,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:22,319 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:22,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403197503] [2022-03-20 16:35:22,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:35:22,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:22,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:22,321 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 16:35:22,349 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 16:35:22,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:35:22,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:22,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 16:35:22,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:35:25,786 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 7 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:35:25,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:35:28,473 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 16:35:28,473 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:35:28,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928976172] [2022-03-20 16:35:28,473 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:35:28,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403197503] [2022-03-20 16:35:28,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403197503] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:35:28,473 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:35:28,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 22 [2022-03-20 16:35:28,474 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:35:28,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [222932376] [2022-03-20 16:35:28,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [222932376] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:35:28,474 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:35:28,474 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 16:35:28,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851054081] [2022-03-20 16:35:28,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:35:28,474 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 16:35:28,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:28,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 16:35:28,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:35:28,475 INFO L87 Difference]: Start difference. First operand 102 states and 113 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:29,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:29,568 INFO L93 Difference]: Finished difference Result 125 states and 138 transitions. [2022-03-20 16:35:29,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 16:35:29,569 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 48 [2022-03-20 16:35:29,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:29,569 INFO L225 Difference]: With dead ends: 125 [2022-03-20 16:35:29,569 INFO L226 Difference]: Without dead ends: 123 [2022-03-20 16:35:29,570 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-03-20 16:35:29,570 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 32 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:29,570 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 274 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 16:35:29,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-03-20 16:35:29,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 112. [2022-03-20 16:35:29,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 89 states have internal predecessors, (98), 14 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 16:35:29,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 124 transitions. [2022-03-20 16:35:29,593 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 124 transitions. Word has length 48 [2022-03-20 16:35:29,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:29,593 INFO L478 AbstractCegarLoop]: Abstraction has 112 states and 124 transitions. [2022-03-20 16:35:29,593 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:29,593 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 124 transitions. [2022-03-20 16:35:29,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:35:29,594 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:29,594 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:29,614 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-03-20 16:35:29,806 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 16:35:29,806 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:29,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:29,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1547206899, now seen corresponding path program 9 times [2022-03-20 16:35:29,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:29,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1852057667] [2022-03-20 16:35:29,809 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:35:29,809 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:35:29,809 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:35:29,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1547206899, now seen corresponding path program 10 times [2022-03-20 16:35:29,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:29,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805818216] [2022-03-20 16:35:29,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:29,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:29,816 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:29,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [147381157] [2022-03-20 16:35:29,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:35:29,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:29,817 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:29,818 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:35:29,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 16:35:29,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:35:29,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:29,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 16:35:29,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:35:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:35:35,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:35:46,538 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 16:35:46,538 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:35:46,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805818216] [2022-03-20 16:35:46,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:35:46,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147381157] [2022-03-20 16:35:46,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147381157] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:35:46,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:35:46,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 20 [2022-03-20 16:35:46,539 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:35:46,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1852057667] [2022-03-20 16:35:46,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1852057667] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:35:46,539 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:35:46,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 16:35:46,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394329656] [2022-03-20 16:35:46,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:35:46,539 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 16:35:46,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:46,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 16:35:46,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-03-20 16:35:46,540 INFO L87 Difference]: Start difference. First operand 112 states and 124 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:49,004 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:35:49,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:49,699 INFO L93 Difference]: Finished difference Result 126 states and 139 transitions. [2022-03-20 16:35:49,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 16:35:49,700 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 48 [2022-03-20 16:35:49,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:49,700 INFO L225 Difference]: With dead ends: 126 [2022-03-20 16:35:49,700 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 16:35:49,701 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:35:49,701 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 19 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:49,701 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 348 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-20 16:35:49,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 16:35:49,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 112. [2022-03-20 16:35:49,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 89 states have internal predecessors, (98), 14 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 16:35:49,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 124 transitions. [2022-03-20 16:35:49,721 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 124 transitions. Word has length 48 [2022-03-20 16:35:49,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:49,722 INFO L478 AbstractCegarLoop]: Abstraction has 112 states and 124 transitions. [2022-03-20 16:35:49,722 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:49,722 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 124 transitions. [2022-03-20 16:35:49,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:35:49,722 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:49,722 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:49,748 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-20 16:35:49,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 16:35:49,944 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:49,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:49,944 INFO L85 PathProgramCache]: Analyzing trace with hash -746811343, now seen corresponding path program 11 times [2022-03-20 16:35:49,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:49,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1778012561] [2022-03-20 16:35:49,946 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:35:49,946 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:35:49,946 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:35:49,947 INFO L85 PathProgramCache]: Analyzing trace with hash -746811343, now seen corresponding path program 12 times [2022-03-20 16:35:49,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:49,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287363181] [2022-03-20 16:35:49,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:49,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:49,952 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:49,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1241331939] [2022-03-20 16:35:49,953 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:35:49,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:49,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:49,954 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:35:49,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 16:35:50,026 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 16:35:50,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:50,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 16:35:50,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:35:51,217 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:35:51,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:35:53,586 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 25 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:35:53,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:35:53,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287363181] [2022-03-20 16:35:53,587 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:35:53,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241331939] [2022-03-20 16:35:53,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241331939] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:35:53,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:35:53,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12] total 26 [2022-03-20 16:35:53,587 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:35:53,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1778012561] [2022-03-20 16:35:53,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1778012561] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:35:53,588 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:35:53,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 16:35:53,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265917118] [2022-03-20 16:35:53,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:35:53,588 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 16:35:53,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:53,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 16:35:53,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=533, Unknown=1, NotChecked=0, Total=650 [2022-03-20 16:35:53,589 INFO L87 Difference]: Start difference. First operand 112 states and 124 transitions. Second operand has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:54,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:54,095 INFO L93 Difference]: Finished difference Result 135 states and 152 transitions. [2022-03-20 16:35:54,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 16:35:54,095 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 48 [2022-03-20 16:35:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:54,096 INFO L225 Difference]: With dead ends: 135 [2022-03-20 16:35:54,096 INFO L226 Difference]: Without dead ends: 133 [2022-03-20 16:35:54,097 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=144, Invalid=725, Unknown=1, NotChecked=0, Total=870 [2022-03-20 16:35:54,097 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 31 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:54,097 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 311 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 268 Invalid, 0 Unknown, 58 Unchecked, 0.4s Time] [2022-03-20 16:35:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-03-20 16:35:54,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 118. [2022-03-20 16:35:54,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 91 states have (on average 1.1428571428571428) internal successors, (104), 94 states have internal predecessors, (104), 15 states have call successors, (15), 12 states have call predecessors, (15), 11 states have return successors, (13), 11 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 16:35:54,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 132 transitions. [2022-03-20 16:35:54,125 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 132 transitions. Word has length 48 [2022-03-20 16:35:54,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:54,125 INFO L478 AbstractCegarLoop]: Abstraction has 118 states and 132 transitions. [2022-03-20 16:35:54,125 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 17 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:35:54,125 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 132 transitions. [2022-03-20 16:35:54,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:35:54,126 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:54,126 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:54,142 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 16:35:54,326 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:54,326 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:54,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:54,327 INFO L85 PathProgramCache]: Analyzing trace with hash 62535283, now seen corresponding path program 13 times [2022-03-20 16:35:54,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:54,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1208491288] [2022-03-20 16:35:54,329 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:35:54,329 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:35:54,329 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:35:54,329 INFO L85 PathProgramCache]: Analyzing trace with hash 62535283, now seen corresponding path program 14 times [2022-03-20 16:35:54,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:54,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028473865] [2022-03-20 16:35:54,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:54,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:54,336 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:54,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1845881006] [2022-03-20 16:35:54,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:35:54,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:54,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:54,338 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:35:54,341 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 16:35:54,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:35:54,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:54,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-20 16:35:54,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:36:12,137 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 27 refuted. 1 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:36:12,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:36:23,553 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 16:36:23,553 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:36:23,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028473865] [2022-03-20 16:36:23,553 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:36:23,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845881006] [2022-03-20 16:36:23,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845881006] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:36:23,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:36:23,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 22 [2022-03-20 16:36:23,554 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:36:23,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1208491288] [2022-03-20 16:36:23,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1208491288] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:36:23,554 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:36:23,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 16:36:23,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697341590] [2022-03-20 16:36:23,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:36:23,555 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 16:36:23,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:23,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 16:36:23,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=380, Unknown=2, NotChecked=0, Total=462 [2022-03-20 16:36:23,555 INFO L87 Difference]: Start difference. First operand 118 states and 132 transitions. Second operand has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 15 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:36:26,705 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:28,911 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:30,920 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:33,036 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:35,358 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.63s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:38,020 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:39,531 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:41,927 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:36:42,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:36:42,105 INFO L93 Difference]: Finished difference Result 136 states and 150 transitions. [2022-03-20 16:36:42,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 16:36:42,105 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 15 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 48 [2022-03-20 16:36:42,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:36:42,106 INFO L225 Difference]: With dead ends: 136 [2022-03-20 16:36:42,106 INFO L226 Difference]: Without dead ends: 134 [2022-03-20 16:36:42,107 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=97, Invalid=501, Unknown=2, NotChecked=0, Total=600 [2022-03-20 16:36:42,108 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 33 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 10 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.5s IncrementalHoareTripleChecker+Time [2022-03-20 16:36:42,108 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 299 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 397 Invalid, 6 Unknown, 0 Unchecked, 18.5s Time] [2022-03-20 16:36:42,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-03-20 16:36:42,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 112. [2022-03-20 16:36:42,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 89 states have internal predecessors, (98), 14 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 16:36:42,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 124 transitions. [2022-03-20 16:36:42,133 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 124 transitions. Word has length 48 [2022-03-20 16:36:42,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:36:42,134 INFO L478 AbstractCegarLoop]: Abstraction has 112 states and 124 transitions. [2022-03-20 16:36:42,134 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 15 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 16:36:42,134 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 124 transitions. [2022-03-20 16:36:42,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:36:42,134 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:36:42,135 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:36:42,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 16:36:42,339 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:36:42,339 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:36:42,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:36:42,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1247333363, now seen corresponding path program 15 times [2022-03-20 16:36:42,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:42,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1133385755] [2022-03-20 16:36:42,342 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:36:42,342 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:36:42,342 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:36:42,342 INFO L85 PathProgramCache]: Analyzing trace with hash 1247333363, now seen corresponding path program 16 times [2022-03-20 16:36:42,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:36:42,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259812063] [2022-03-20 16:36:42,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:36:42,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:36:42,348 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:36:42,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567454258] [2022-03-20 16:36:42,348 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:36:42,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:36:42,348 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:36:42,349 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:36:42,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 16:36:42,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:36:42,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:36:42,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 16:36:42,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:36:43,502 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:36:45,938 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 37 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:36:45,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:36:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 16:36:49,550 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:36:49,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259812063] [2022-03-20 16:36:49,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:36:49,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567454258] [2022-03-20 16:36:49,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567454258] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:36:49,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:36:49,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11] total 21 [2022-03-20 16:36:49,550 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:36:49,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1133385755] [2022-03-20 16:36:49,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1133385755] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:36:49,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:36:49,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 16:36:49,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461059495] [2022-03-20 16:36:49,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:36:49,551 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 16:36:49,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:49,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 16:36:49,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-03-20 16:36:49,552 INFO L87 Difference]: Start difference. First operand 112 states and 124 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:36:52,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:36:52,594 INFO L93 Difference]: Finished difference Result 162 states and 185 transitions. [2022-03-20 16:36:52,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 16:36:52,595 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 48 [2022-03-20 16:36:52,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:36:52,596 INFO L225 Difference]: With dead ends: 162 [2022-03-20 16:36:52,596 INFO L226 Difference]: Without dead ends: 160 [2022-03-20 16:36:52,596 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 76 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=144, Invalid=506, Unknown=0, NotChecked=0, Total=650 [2022-03-20 16:36:52,597 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 30 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:36:52,597 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 212 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 115 Invalid, 0 Unknown, 29 Unchecked, 0.2s Time] [2022-03-20 16:36:52,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-03-20 16:36:52,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 134. [2022-03-20 16:36:52,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 103 states have (on average 1.145631067961165) internal successors, (118), 109 states have internal predecessors, (118), 18 states have call successors, (18), 13 states have call predecessors, (18), 12 states have return successors, (16), 11 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 16:36:52,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 152 transitions. [2022-03-20 16:36:52,630 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 152 transitions. Word has length 48 [2022-03-20 16:36:52,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:36:52,630 INFO L478 AbstractCegarLoop]: Abstraction has 134 states and 152 transitions. [2022-03-20 16:36:52,630 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:36:52,630 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 152 transitions. [2022-03-20 16:36:52,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 16:36:52,630 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:36:52,630 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:36:52,646 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 16:36:52,831 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 16:36:52,831 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:36:52,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:36:52,831 INFO L85 PathProgramCache]: Analyzing trace with hash -921054650, now seen corresponding path program 7 times [2022-03-20 16:36:52,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:52,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [702472] [2022-03-20 16:36:52,833 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:36:52,833 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:36:52,833 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:36:52,833 INFO L85 PathProgramCache]: Analyzing trace with hash -921054650, now seen corresponding path program 8 times [2022-03-20 16:36:52,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:36:52,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692732123] [2022-03-20 16:36:52,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:36:52,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:36:52,839 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:36:52,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1754756130] [2022-03-20 16:36:52,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:36:52,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:36:52,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:36:52,840 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:36:52,842 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 16:36:52,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:36:52,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:36:52,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 16:36:52,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:36:52,981 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 8 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:36:52,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:36:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 16:36:53,108 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:36:53,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692732123] [2022-03-20 16:36:53,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:36:53,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754756130] [2022-03-20 16:36:53,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754756130] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:36:53,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:36:53,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-03-20 16:36:53,108 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:36:53,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [702472] [2022-03-20 16:36:53,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [702472] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:36:53,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:36:53,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 16:36:53,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181544346] [2022-03-20 16:36:53,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:36:53,109 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 16:36:53,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:53,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 16:36:53,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:36:53,109 INFO L87 Difference]: Start difference. First operand 134 states and 152 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 7 states have internal predecessors, (44), 7 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:36:53,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:36:53,185 INFO L93 Difference]: Finished difference Result 172 states and 197 transitions. [2022-03-20 16:36:53,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:36:53,187 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 7 states have internal predecessors, (44), 7 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 58 [2022-03-20 16:36:53,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:36:53,188 INFO L225 Difference]: With dead ends: 172 [2022-03-20 16:36:53,188 INFO L226 Difference]: Without dead ends: 165 [2022-03-20 16:36:53,188 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=183, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:36:53,189 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 18 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:36:53,189 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:36:53,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-03-20 16:36:53,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 154. [2022-03-20 16:36:53,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 121 states have (on average 1.140495867768595) internal successors, (138), 125 states have internal predecessors, (138), 19 states have call successors, (19), 14 states have call predecessors, (19), 13 states have return successors, (17), 14 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 16:36:53,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 174 transitions. [2022-03-20 16:36:53,223 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 174 transitions. Word has length 58 [2022-03-20 16:36:53,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:36:53,224 INFO L478 AbstractCegarLoop]: Abstraction has 154 states and 174 transitions. [2022-03-20 16:36:53,224 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 7 states have internal predecessors, (44), 7 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:36:53,224 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 174 transitions. [2022-03-20 16:36:53,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 16:36:53,224 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:36:53,225 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:36:53,245 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 16:36:53,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 16:36:53,436 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:36:53,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:36:53,437 INFO L85 PathProgramCache]: Analyzing trace with hash -919267190, now seen corresponding path program 7 times [2022-03-20 16:36:53,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:36:53,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [573468372] [2022-03-20 16:36:53,438 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:36:53,438 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:36:53,438 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:36:53,438 INFO L85 PathProgramCache]: Analyzing trace with hash -919267190, now seen corresponding path program 8 times [2022-03-20 16:36:53,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:36:53,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684703945] [2022-03-20 16:36:53,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:36:53,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:36:53,444 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:36:53,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1605836431] [2022-03-20 16:36:53,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:36:53,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:36:53,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:36:53,445 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:36:53,446 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 16:36:53,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:36:53,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:36:53,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 16:36:53,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:37:13,892 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:37:13,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:37:20,079 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:37:26,359 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:37:26,360 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:37:26,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684703945] [2022-03-20 16:37:26,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:37:26,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605836431] [2022-03-20 16:37:26,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605836431] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:37:26,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:37:26,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 30 [2022-03-20 16:37:26,360 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:37:26,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [573468372] [2022-03-20 16:37:26,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [573468372] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:37:26,360 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:37:26,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 16:37:26,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988482866] [2022-03-20 16:37:26,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:37:26,361 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 16:37:26,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:37:26,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 16:37:26,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2022-03-20 16:37:26,362 INFO L87 Difference]: Start difference. First operand 154 states and 174 transitions. Second operand has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 16 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:37:27,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:37:27,195 INFO L93 Difference]: Finished difference Result 164 states and 185 transitions. [2022-03-20 16:37:27,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 16:37:27,196 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 16 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 58 [2022-03-20 16:37:27,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:37:27,197 INFO L225 Difference]: With dead ends: 164 [2022-03-20 16:37:27,197 INFO L226 Difference]: Without dead ends: 162 [2022-03-20 16:37:27,197 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=175, Invalid=881, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 16:37:27,198 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 35 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 16:37:27,198 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 365 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 16:37:27,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-03-20 16:37:27,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 159. [2022-03-20 16:37:27,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 124 states have (on average 1.1370967741935485) internal successors, (141), 129 states have internal predecessors, (141), 20 states have call successors, (20), 15 states have call predecessors, (20), 14 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 16:37:27,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 179 transitions. [2022-03-20 16:37:27,248 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 179 transitions. Word has length 58 [2022-03-20 16:37:27,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:37:27,248 INFO L478 AbstractCegarLoop]: Abstraction has 159 states and 179 transitions. [2022-03-20 16:37:27,248 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 16 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:37:27,248 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 179 transitions. [2022-03-20 16:37:27,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 16:37:27,249 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:37:27,249 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:37:27,275 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 16:37:27,475 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:37:27,475 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:37:27,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:37:27,475 INFO L85 PathProgramCache]: Analyzing trace with hash 110092108, now seen corresponding path program 17 times [2022-03-20 16:37:27,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:37:27,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1563921117] [2022-03-20 16:37:27,478 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:37:27,478 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:37:27,478 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:37:27,478 INFO L85 PathProgramCache]: Analyzing trace with hash 110092108, now seen corresponding path program 18 times [2022-03-20 16:37:27,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:37:27,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201651175] [2022-03-20 16:37:27,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:37:27,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:37:27,483 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:37:27,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [727600637] [2022-03-20 16:37:27,483 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:37:27,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:37:27,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:37:27,484 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:37:27,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 16:37:27,544 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 16:37:27,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:37:27,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 16:37:27,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:37:29,000 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 16 proven. 49 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:37:29,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:37:31,038 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:38:12,476 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:38:12,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201651175] [2022-03-20 16:38:12,477 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:38:12,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727600637] [2022-03-20 16:38:12,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727600637] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:38:12,477 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:38:12,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-03-20 16:38:12,477 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:38:12,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1563921117] [2022-03-20 16:38:12,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1563921117] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:38:12,478 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:38:12,478 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 16:38:12,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841787617] [2022-03-20 16:38:12,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:38:12,478 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 16:38:12,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:38:12,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 16:38:12,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2022-03-20 16:38:12,479 INFO L87 Difference]: Start difference. First operand 159 states and 179 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:38:13,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:38:13,346 INFO L93 Difference]: Finished difference Result 178 states and 201 transitions. [2022-03-20 16:38:13,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 16:38:13,346 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 58 [2022-03-20 16:38:13,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:38:13,349 INFO L225 Difference]: With dead ends: 178 [2022-03-20 16:38:13,349 INFO L226 Difference]: Without dead ends: 176 [2022-03-20 16:38:13,350 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=175, Invalid=881, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 16:38:13,350 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 42 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:38:13,351 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 263 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 256 Invalid, 0 Unknown, 35 Unchecked, 0.3s Time] [2022-03-20 16:38:13,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-20 16:38:13,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 160. [2022-03-20 16:38:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 124 states have (on average 1.1370967741935485) internal successors, (141), 129 states have internal predecessors, (141), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 16:38:13,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 179 transitions. [2022-03-20 16:38:13,399 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 179 transitions. Word has length 58 [2022-03-20 16:38:13,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:38:13,400 INFO L478 AbstractCegarLoop]: Abstraction has 160 states and 179 transitions. [2022-03-20 16:38:13,400 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:38:13,401 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 179 transitions. [2022-03-20 16:38:13,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 16:38:13,402 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:38:13,402 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:38:13,424 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 16:38:13,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:38:13,623 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:38:13,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:38:13,624 INFO L85 PathProgramCache]: Analyzing trace with hash 919438734, now seen corresponding path program 19 times [2022-03-20 16:38:13,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:38:13,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [569315209] [2022-03-20 16:38:13,629 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:38:13,629 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:38:13,629 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:38:13,629 INFO L85 PathProgramCache]: Analyzing trace with hash 919438734, now seen corresponding path program 20 times [2022-03-20 16:38:13,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:38:13,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172369948] [2022-03-20 16:38:13,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:38:13,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:38:13,634 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:38:13,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [745538677] [2022-03-20 16:38:13,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:38:13,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:38:13,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:38:13,635 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:38:13,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 16:38:13,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:38:13,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:38:13,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 16:38:13,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:38:48,924 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 62 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:38:48,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:39:09,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:39:09,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172369948] [2022-03-20 16:39:09,253 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:39:09,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745538677] [2022-03-20 16:39:09,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745538677] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:39:09,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:39:09,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-03-20 16:39:09,254 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:39:09,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [569315209] [2022-03-20 16:39:09,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [569315209] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:39:09,254 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:39:09,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 16:39:09,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292186002] [2022-03-20 16:39:09,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:39:09,254 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 16:39:09,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:39:09,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 16:39:09,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=534, Unknown=3, NotChecked=0, Total=650 [2022-03-20 16:39:09,255 INFO L87 Difference]: Start difference. First operand 160 states and 179 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:39:10,666 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:39:11,736 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:39:13,345 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:39:15,054 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:39:16,966 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:39:19,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:39:19,240 INFO L93 Difference]: Finished difference Result 174 states and 193 transitions. [2022-03-20 16:39:19,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 16:39:19,241 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 58 [2022-03-20 16:39:19,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:39:19,242 INFO L225 Difference]: With dead ends: 174 [2022-03-20 16:39:19,242 INFO L226 Difference]: Without dead ends: 172 [2022-03-20 16:39:19,242 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=128, Invalid=681, Unknown=3, NotChecked=0, Total=812 [2022-03-20 16:39:19,242 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 37 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2022-03-20 16:39:19,243 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 383 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 9.9s Time] [2022-03-20 16:39:19,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-03-20 16:39:19,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 153. [2022-03-20 16:39:19,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 122 states have internal predecessors, (135), 19 states have call successors, (19), 16 states have call predecessors, (19), 15 states have return successors, (17), 14 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 16:39:19,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 171 transitions. [2022-03-20 16:39:19,279 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 171 transitions. Word has length 58 [2022-03-20 16:39:19,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:39:19,280 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 171 transitions. [2022-03-20 16:39:19,280 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:39:19,280 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 171 transitions. [2022-03-20 16:39:19,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 16:39:19,281 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:39:19,281 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:39:19,298 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 16:39:19,485 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-20 16:39:19,485 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:39:19,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:39:19,485 INFO L85 PathProgramCache]: Analyzing trace with hash 2024097313, now seen corresponding path program 9 times [2022-03-20 16:39:19,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:39:19,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1927070725] [2022-03-20 16:39:19,487 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:39:19,487 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:39:19,487 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:39:19,487 INFO L85 PathProgramCache]: Analyzing trace with hash 2024097313, now seen corresponding path program 10 times [2022-03-20 16:39:19,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:39:19,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027379300] [2022-03-20 16:39:19,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:39:19,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:39:19,492 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:39:19,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1810947677] [2022-03-20 16:39:19,492 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:39:19,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:39:19,493 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:39:19,494 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:39:19,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 16:39:19,544 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:39:19,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:39:19,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 16:39:19,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:39:19,663 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 16:39:19,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:39:19,813 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 70 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-20 16:39:19,813 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:39:19,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027379300] [2022-03-20 16:39:19,813 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:39:19,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810947677] [2022-03-20 16:39:19,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810947677] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:39:19,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:39:19,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-03-20 16:39:19,814 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:39:19,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1927070725] [2022-03-20 16:39:19,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1927070725] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:39:19,814 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:39:19,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 16:39:19,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227970624] [2022-03-20 16:39:19,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:39:19,814 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 16:39:19,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:39:19,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 16:39:19,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:39:19,815 INFO L87 Difference]: Start difference. First operand 153 states and 171 transitions. Second operand has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 8 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:39:19,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:39:19,910 INFO L93 Difference]: Finished difference Result 183 states and 207 transitions. [2022-03-20 16:39:19,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:39:19,910 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 8 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 68 [2022-03-20 16:39:19,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:39:19,911 INFO L225 Difference]: With dead ends: 183 [2022-03-20 16:39:19,911 INFO L226 Difference]: Without dead ends: 176 [2022-03-20 16:39:19,912 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=249, Unknown=0, NotChecked=0, Total=420 [2022-03-20 16:39:19,912 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 21 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:39:19,912 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 108 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:39:19,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-20 16:39:19,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 176. [2022-03-20 16:39:19,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 139 states have (on average 1.143884892086331) internal successors, (159), 141 states have internal predecessors, (159), 20 states have call successors, (20), 17 states have call predecessors, (20), 16 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 16:39:19,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 197 transitions. [2022-03-20 16:39:19,955 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 197 transitions. Word has length 68 [2022-03-20 16:39:19,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:39:19,955 INFO L478 AbstractCegarLoop]: Abstraction has 176 states and 197 transitions. [2022-03-20 16:39:19,955 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 8 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:39:19,955 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 197 transitions. [2022-03-20 16:39:19,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 16:39:19,956 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:39:19,956 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:39:19,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 16:39:20,157 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 16:39:20,157 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:39:20,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:39:20,158 INFO L85 PathProgramCache]: Analyzing trace with hash 2025884773, now seen corresponding path program 9 times [2022-03-20 16:39:20,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:39:20,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [410672996] [2022-03-20 16:39:20,159 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:39:20,160 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 16:39:20,160 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:39:20,160 INFO L85 PathProgramCache]: Analyzing trace with hash 2025884773, now seen corresponding path program 10 times [2022-03-20 16:39:20,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:39:20,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926618357] [2022-03-20 16:39:20,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:39:20,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:39:20,170 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:39:20,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [270199831] [2022-03-20 16:39:20,170 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:39:20,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:39:20,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:39:20,171 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:39:20,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 16:39:20,214 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:39:20,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:39:20,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-20 16:39:20,216 INFO L286 TraceCheckSpWp]: Computing forward predicates...