/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 09:17:39,096 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 09:17:39,130 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 09:17:39,161 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 09:17:39,203 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 09:17:39,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 09:17:39,206 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 09:17:39,207 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 09:17:39,213 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 09:17:39,214 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 09:17:39,215 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 09:17:39,215 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 09:17:39,215 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 09:17:39,215 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 09:17:39,216 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 09:17:39,216 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 09:17:39,216 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 09:17:39,216 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 09:17:39,216 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 09:17:39,217 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:17:39,217 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 09:17:39,217 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 09:17:39,218 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 09:17:39,218 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 09:17:39,409 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 09:17:39,423 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 09:17:39,425 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 09:17:39,425 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 09:17:39,429 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 09:17:39,430 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c [2022-03-19 09:17:39,510 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359cfc821/9e0e2bc116cb4befb7f19c53c0726219/FLAGe084a9997 [2022-03-19 09:17:39,791 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 09:17:39,792 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c [2022-03-19 09:17:39,797 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359cfc821/9e0e2bc116cb4befb7f19c53c0726219/FLAGe084a9997 [2022-03-19 09:17:40,238 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359cfc821/9e0e2bc116cb4befb7f19c53c0726219 [2022-03-19 09:17:40,240 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 09:17:40,241 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 09:17:40,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 09:17:40,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 09:17:40,248 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 09:17:40,248 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,249 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f1825c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40, skipping insertion in model container [2022-03-19 09:17:40,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,253 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 09:17:40,261 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 09:17:40,382 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/bresenham-ll_valuebound20.c[597,610] [2022-03-19 09:17:40,408 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:17:40,414 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 09:17:40,435 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/bresenham-ll_valuebound20.c[597,610] [2022-03-19 09:17:40,461 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:17:40,469 INFO L208 MainTranslator]: Completed translation [2022-03-19 09:17:40,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40 WrapperNode [2022-03-19 09:17:40,470 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 09:17:40,471 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 09:17:40,471 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 09:17:40,471 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 09:17:40,478 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,479 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,482 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,483 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,486 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,488 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,489 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,490 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 09:17:40,491 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 09:17:40,497 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 09:17:40,498 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 09:17:40,499 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (1/1) ... [2022-03-19 09:17:40,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:17:40,519 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:40,530 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) [2022-03-19 09:17:40,536 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 [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 09:17:40,555 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 09:17:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 09:17:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 09:17:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 09:17:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 09:17:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 09:17:40,602 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 09:17:40,603 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 09:17:40,696 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 09:17:40,700 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 09:17:40,701 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-19 09:17:40,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:17:40 BoogieIcfgContainer [2022-03-19 09:17:40,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 09:17:40,712 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 09:17:40,712 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 09:17:40,714 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 09:17:40,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 09:17:40" (1/3) ... [2022-03-19 09:17:40,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34803a25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:17:40, skipping insertion in model container [2022-03-19 09:17:40,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:17:40" (2/3) ... [2022-03-19 09:17:40,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34803a25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:17:40, skipping insertion in model container [2022-03-19 09:17:40,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:17:40" (3/3) ... [2022-03-19 09:17:40,724 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_valuebound20.c [2022-03-19 09:17:40,728 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 09:17:40,728 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 09:17:40,759 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 09:17:40,764 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 [2022-03-19 09:17:40,764 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 09:17:40,772 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-19 09:17:40,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 09:17:40,779 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:40,780 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:17:40,780 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:40,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:40,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1867489771, now seen corresponding path program 1 times [2022-03-19 09:17:40,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:40,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [100391113] [2022-03-19 09:17:40,811 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:40,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1867489771, now seen corresponding path program 2 times [2022-03-19 09:17:40,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:40,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968113209] [2022-03-19 09:17:40,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:40,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:40,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:17:40,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 09:17:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:17:40,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-19 09:17:40,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:17:40,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-19 09:17:40,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:17:40,995 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 09:17:40,996 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:40,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968113209] [2022-03-19 09:17:40,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968113209] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:40,997 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:40,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:17:40,999 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:40,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [100391113] [2022-03-19 09:17:40,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [100391113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:40,999 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:40,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:17:40,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172015664] [2022-03-19 09:17:41,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:41,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 09:17:41,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:41,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 09:17:41,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 09:17:41,020 INFO L87 Difference]: Start difference. First operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-19 09:17:41,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:41,063 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-03-19 09:17:41,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 09:17:41,066 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-19 09:17:41,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:41,070 INFO L225 Difference]: With dead ends: 57 [2022-03-19 09:17:41,071 INFO L226 Difference]: Without dead ends: 27 [2022-03-19 09:17:41,073 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 09:17:41,075 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:41,076 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 34 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:17:41,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-19 09:17:41,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-19 09:17:41,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-19 09:17:41,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-03-19 09:17:41,100 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2022-03-19 09:17:41,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:41,101 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-03-19 09:17:41,101 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-19 09:17:41,101 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-03-19 09:17:41,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 09:17:41,102 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:41,102 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:17:41,102 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 09:17:41,103 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:41,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:41,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1827672217, now seen corresponding path program 1 times [2022-03-19 09:17:41,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:41,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [189864629] [2022-03-19 09:17:41,104 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:41,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1827672217, now seen corresponding path program 2 times [2022-03-19 09:17:41,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:41,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062851231] [2022-03-19 09:17:41,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:41,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:41,118 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:41,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1343369361] [2022-03-19 09:17:41,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:17:41,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:41,119 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:41,120 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) [2022-03-19 09:17:41,122 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 09:17:41,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-19 09:17:41,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:41,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-19 09:17:41,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:41,309 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 09:17:41,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:17:41,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:41,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062851231] [2022-03-19 09:17:41,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:41,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343369361] [2022-03-19 09:17:41,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343369361] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:41,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:41,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 09:17:41,311 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:41,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [189864629] [2022-03-19 09:17:41,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [189864629] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:41,311 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:41,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 09:17:41,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524038206] [2022-03-19 09:17:41,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:41,312 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 09:17:41,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:41,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 09:17:41,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 09:17:41,313 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-19 09:17:41,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:41,383 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-03-19 09:17:41,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 09:17:41,383 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2022-03-19 09:17:41,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:41,385 INFO L225 Difference]: With dead ends: 39 [2022-03-19 09:17:41,385 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 09:17:41,385 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-19 09:17:41,386 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:41,387 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 101 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:17:41,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 09:17:41,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-03-19 09:17:41,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-19 09:17:41,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-03-19 09:17:41,394 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 23 [2022-03-19 09:17:41,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:41,395 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-03-19 09:17:41,395 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-19 09:17:41,395 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-03-19 09:17:41,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 09:17:41,396 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:41,396 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:17:41,417 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:41,611 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 [2022-03-19 09:17:41,611 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:41,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:41,613 INFO L85 PathProgramCache]: Analyzing trace with hash -1419291471, now seen corresponding path program 1 times [2022-03-19 09:17:41,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:41,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1662552460] [2022-03-19 09:17:41,619 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:41,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1419291471, now seen corresponding path program 2 times [2022-03-19 09:17:41,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:41,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059195187] [2022-03-19 09:17:41,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:41,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:41,689 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:41,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1150532265] [2022-03-19 09:17:41,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:17:41,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:41,690 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:41,693 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) [2022-03-19 09:17:41,713 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 09:17:41,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:17:41,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:41,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 09:17:41,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:41,958 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 09:17:41,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:42,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-19 09:17:42,086 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:42,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059195187] [2022-03-19 09:17:42,086 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:42,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150532265] [2022-03-19 09:17:42,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150532265] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:42,086 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:42,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2022-03-19 09:17:42,087 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:42,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1662552460] [2022-03-19 09:17:42,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1662552460] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:42,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:42,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 09:17:42,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321969107] [2022-03-19 09:17:42,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:42,088 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 09:17:42,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:42,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 09:17:42,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-03-19 09:17:42,090 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:17:42,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:42,216 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2022-03-19 09:17:42,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 09:17:42,217 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-19 09:17:42,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:42,217 INFO L225 Difference]: With dead ends: 48 [2022-03-19 09:17:42,218 INFO L226 Difference]: Without dead ends: 44 [2022-03-19 09:17:42,218 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-03-19 09:17:42,219 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 25 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:42,219 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 129 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:17:42,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-19 09:17:42,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-19 09:17:42,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-19 09:17:42,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2022-03-19 09:17:42,227 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 32 [2022-03-19 09:17:42,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:42,227 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2022-03-19 09:17:42,227 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:17:42,227 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2022-03-19 09:17:42,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 09:17:42,228 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:42,228 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:17:42,253 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:42,444 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 [2022-03-19 09:17:42,445 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:42,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:42,445 INFO L85 PathProgramCache]: Analyzing trace with hash 355715891, now seen corresponding path program 1 times [2022-03-19 09:17:42,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:42,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [273844063] [2022-03-19 09:17:42,446 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:42,446 INFO L85 PathProgramCache]: Analyzing trace with hash 355715891, now seen corresponding path program 2 times [2022-03-19 09:17:42,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:42,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043300259] [2022-03-19 09:17:42,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:42,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:42,458 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:42,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1848213096] [2022-03-19 09:17:42,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:17:42,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:42,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:42,459 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) [2022-03-19 09:17:42,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 09:17:42,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:17:42,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:42,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 09:17:42,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:42,658 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 09:17:42,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:42,822 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 09:17:42,822 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:42,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043300259] [2022-03-19 09:17:42,822 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:42,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848213096] [2022-03-19 09:17:42,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848213096] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:42,823 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:42,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2022-03-19 09:17:42,823 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:42,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [273844063] [2022-03-19 09:17:42,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [273844063] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:42,823 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:42,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 09:17:42,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749129774] [2022-03-19 09:17:42,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:42,824 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 09:17:42,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:42,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 09:17:42,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-19 09:17:42,824 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:17:42,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:42,936 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2022-03-19 09:17:42,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 09:17:42,937 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-19 09:17:42,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:42,938 INFO L225 Difference]: With dead ends: 56 [2022-03-19 09:17:42,938 INFO L226 Difference]: Without dead ends: 54 [2022-03-19 09:17:42,938 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-03-19 09:17:42,939 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 11 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:42,939 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 183 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:17:42,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-19 09:17:42,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2022-03-19 09:17:42,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-19 09:17:42,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-03-19 09:17:42,947 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 32 [2022-03-19 09:17:42,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:42,947 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-03-19 09:17:42,947 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:17:42,948 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-03-19 09:17:42,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 09:17:42,948 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:42,948 INFO L500 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2022-03-19 09:17:42,968 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:43,165 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 [2022-03-19 09:17:43,166 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:43,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:43,166 INFO L85 PathProgramCache]: Analyzing trace with hash 125050924, now seen corresponding path program 1 times [2022-03-19 09:17:43,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:43,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1898855753] [2022-03-19 09:17:43,167 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:43,167 INFO L85 PathProgramCache]: Analyzing trace with hash 125050924, now seen corresponding path program 2 times [2022-03-19 09:17:43,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:43,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090098818] [2022-03-19 09:17:43,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:43,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:43,177 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:43,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1481444495] [2022-03-19 09:17:43,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:17:43,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:43,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:43,179 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) [2022-03-19 09:17:43,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 09:17:43,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:17:43,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:43,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 09:17:43,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:43,419 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:43,421 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:43,423 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:44,166 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-19 09:17:44,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:44,557 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-19 09:17:44,559 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:44,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090098818] [2022-03-19 09:17:44,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:44,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481444495] [2022-03-19 09:17:44,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481444495] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:44,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:44,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2022-03-19 09:17:44,560 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:44,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1898855753] [2022-03-19 09:17:44,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1898855753] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:44,560 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:44,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:17:44,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642751220] [2022-03-19 09:17:44,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:44,561 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:17:44,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:44,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:17:44,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-03-19 09:17:44,562 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 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) [2022-03-19 09:17:48,915 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 [] [2022-03-19 09:17:49,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:49,145 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-03-19 09:17:49,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:17:49,146 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 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 39 [2022-03-19 09:17:49,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:49,146 INFO L225 Difference]: With dead ends: 61 [2022-03-19 09:17:49,146 INFO L226 Difference]: Without dead ends: 53 [2022-03-19 09:17:49,147 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=116, Invalid=586, Unknown=0, NotChecked=0, Total=702 [2022-03-19 09:17:49,147 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 18 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:49,148 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 217 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-03-19 09:17:49,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-19 09:17:49,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 43. [2022-03-19 09:17:49,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-19 09:17:49,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2022-03-19 09:17:49,154 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 39 [2022-03-19 09:17:49,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:49,154 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2022-03-19 09:17:49,154 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 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) [2022-03-19 09:17:49,154 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2022-03-19 09:17:49,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 09:17:49,154 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:49,155 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:17:49,172 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:49,355 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 [2022-03-19 09:17:49,355 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:49,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:49,356 INFO L85 PathProgramCache]: Analyzing trace with hash 733948825, now seen corresponding path program 3 times [2022-03-19 09:17:49,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:49,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [424554580] [2022-03-19 09:17:49,356 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:49,356 INFO L85 PathProgramCache]: Analyzing trace with hash 733948825, now seen corresponding path program 4 times [2022-03-19 09:17:49,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:49,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524241089] [2022-03-19 09:17:49,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:49,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:49,374 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:49,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1096095172] [2022-03-19 09:17:49,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:17:49,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:49,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:49,375 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) [2022-03-19 09:17:49,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 09:17:49,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:17:49,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:49,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 09:17:49,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:49,633 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-19 09:17:49,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:49,920 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 09:17:49,921 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:49,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524241089] [2022-03-19 09:17:49,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:49,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096095172] [2022-03-19 09:17:49,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096095172] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:49,921 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:49,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2022-03-19 09:17:49,922 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:49,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [424554580] [2022-03-19 09:17:49,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [424554580] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:49,922 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:49,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 09:17:49,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282159685] [2022-03-19 09:17:49,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:49,922 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 09:17:49,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:49,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 09:17:49,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-19 09:17:49,923 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 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) [2022-03-19 09:17:50,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:50,221 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2022-03-19 09:17:50,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 09:17:50,222 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 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 41 [2022-03-19 09:17:50,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:50,224 INFO L225 Difference]: With dead ends: 61 [2022-03-19 09:17:50,224 INFO L226 Difference]: Without dead ends: 57 [2022-03-19 09:17:50,224 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-03-19 09:17:50,225 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:50,225 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 240 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 09:17:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-19 09:17:50,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-03-19 09:17:50,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.131578947368421) internal successors, (43), 40 states have internal predecessors, (43), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-19 09:17:50,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2022-03-19 09:17:50,239 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 41 [2022-03-19 09:17:50,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:50,239 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2022-03-19 09:17:50,239 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 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) [2022-03-19 09:17:50,240 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2022-03-19 09:17:50,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 09:17:50,242 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:50,242 INFO L500 BasicCegarLoop]: trace histogram [3, 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] [2022-03-19 09:17:50,292 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:50,458 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 [2022-03-19 09:17:50,459 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:50,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:50,459 INFO L85 PathProgramCache]: Analyzing trace with hash -1786011109, now seen corresponding path program 1 times [2022-03-19 09:17:50,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:50,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [654896796] [2022-03-19 09:17:50,460 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:50,460 INFO L85 PathProgramCache]: Analyzing trace with hash -1786011109, now seen corresponding path program 2 times [2022-03-19 09:17:50,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:50,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58085442] [2022-03-19 09:17:50,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:50,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:50,470 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:50,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1917205593] [2022-03-19 09:17:50,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:17:50,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:50,471 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:50,475 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) [2022-03-19 09:17:50,476 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 09:17:50,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:17:50,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:50,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 09:17:50,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:50,748 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-19 09:17:50,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:50,941 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 09:17:50,942 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:50,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58085442] [2022-03-19 09:17:50,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:50,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917205593] [2022-03-19 09:17:50,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917205593] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:50,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:50,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2022-03-19 09:17:50,943 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:50,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [654896796] [2022-03-19 09:17:50,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [654896796] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:50,943 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:50,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 09:17:50,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114072592] [2022-03-19 09:17:50,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:50,944 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 09:17:50,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:50,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 09:17:50,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2022-03-19 09:17:50,945 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 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) [2022-03-19 09:17:51,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:17:51,123 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2022-03-19 09:17:51,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 09:17:51,124 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 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 41 [2022-03-19 09:17:51,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:17:51,125 INFO L225 Difference]: With dead ends: 72 [2022-03-19 09:17:51,125 INFO L226 Difference]: Without dead ends: 70 [2022-03-19 09:17:51,126 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-03-19 09:17:51,126 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 16 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:17:51,127 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 232 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:17:51,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-19 09:17:51,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 59. [2022-03-19 09:17:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 43 states have internal predecessors, (46), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-19 09:17:51,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2022-03-19 09:17:51,142 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 41 [2022-03-19 09:17:51,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:17:51,142 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2022-03-19 09:17:51,142 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 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) [2022-03-19 09:17:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2022-03-19 09:17:51,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 09:17:51,145 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:17:51,145 INFO L500 BasicCegarLoop]: trace histogram [3, 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] [2022-03-19 09:17:51,173 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 09:17:51,361 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 [2022-03-19 09:17:51,362 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:17:51,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:17:51,362 INFO L85 PathProgramCache]: Analyzing trace with hash -287119529, now seen corresponding path program 3 times [2022-03-19 09:17:51,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:51,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1309301963] [2022-03-19 09:17:51,363 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:17:51,363 INFO L85 PathProgramCache]: Analyzing trace with hash -287119529, now seen corresponding path program 4 times [2022-03-19 09:17:51,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:17:51,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079979376] [2022-03-19 09:17:51,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:17:51,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:17:51,376 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:17:51,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1221553025] [2022-03-19 09:17:51,376 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:17:51,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:17:51,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:17:51,378 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) [2022-03-19 09:17:51,386 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 09:17:51,428 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:17:51,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:17:51,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 09:17:51,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:17:51,734 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:51,736 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:17:53,986 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-19 09:17:53,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:17:54,529 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 09:17:54,529 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:17:54,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079979376] [2022-03-19 09:17:54,529 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:17:54,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221553025] [2022-03-19 09:17:54,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221553025] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:17:54,530 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:17:54,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 20 [2022-03-19 09:17:54,530 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:17:54,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1309301963] [2022-03-19 09:17:54,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1309301963] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:17:54,530 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:17:54,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:17:54,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118961599] [2022-03-19 09:17:54,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:17:54,531 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:17:54,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:17:54,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:17:54,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=319, Unknown=1, NotChecked=0, Total=380 [2022-03-19 09:17:54,532 INFO L87 Difference]: Start difference. First operand 59 states and 64 transitions. Second operand has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 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) [2022-03-19 09:17:56,574 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:17:58,616 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:18:01,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:01,664 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2022-03-19 09:18:01,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:18:01,664 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 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 41 [2022-03-19 09:18:01,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:01,665 INFO L225 Difference]: With dead ends: 86 [2022-03-19 09:18:01,665 INFO L226 Difference]: Without dead ends: 73 [2022-03-19 09:18:01,666 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=98, Invalid=500, Unknown=2, NotChecked=0, Total=600 [2022-03-19 09:18:01,667 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 8 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:01,667 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 208 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 233 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2022-03-19 09:18:01,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-19 09:18:01,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-19 09:18:01,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-19 09:18:01,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-19 09:18:01,679 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 41 [2022-03-19 09:18:01,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:01,680 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-19 09:18:01,680 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 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) [2022-03-19 09:18:01,680 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-19 09:18:01,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 09:18:01,680 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:01,680 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:01,689 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-19 09:18:01,881 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 [2022-03-19 09:18:01,881 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:01,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:01,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1487887833, now seen corresponding path program 3 times [2022-03-19 09:18:01,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:01,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1170263202] [2022-03-19 09:18:01,882 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:01,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1487887833, now seen corresponding path program 4 times [2022-03-19 09:18:01,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:01,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329346777] [2022-03-19 09:18:01,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:01,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:01,896 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:01,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [219833881] [2022-03-19 09:18:01,897 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:18:01,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:01,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:01,909 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) [2022-03-19 09:18:01,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 09:18:01,954 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:18:01,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:01,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-19 09:18:01,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:02,198 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-19 09:18:02,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:02,442 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-19 09:18:02,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:02,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329346777] [2022-03-19 09:18:02,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:02,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219833881] [2022-03-19 09:18:02,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219833881] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:02,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:02,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-03-19 09:18:02,443 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:02,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1170263202] [2022-03-19 09:18:02,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1170263202] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:02,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:02,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 09:18:02,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570354834] [2022-03-19 09:18:02,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:02,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 09:18:02,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:02,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 09:18:02,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2022-03-19 09:18:02,444 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-19 09:18:02,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:02,618 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2022-03-19 09:18:02,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 09:18:02,618 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2022-03-19 09:18:02,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:02,619 INFO L225 Difference]: With dead ends: 86 [2022-03-19 09:18:02,619 INFO L226 Difference]: Without dead ends: 84 [2022-03-19 09:18:02,619 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-03-19 09:18:02,620 INFO L912 BasicCegarLoop]: 32 mSDtfsCounter, 11 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:02,620 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 254 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:18:02,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-19 09:18:02,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 73. [2022-03-19 09:18:02,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-19 09:18:02,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-19 09:18:02,635 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 41 [2022-03-19 09:18:02,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:02,636 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-19 09:18:02,636 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-19 09:18:02,636 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-19 09:18:02,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 09:18:02,637 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:02,637 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:02,643 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:02,843 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 [2022-03-19 09:18:02,844 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:02,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:02,844 INFO L85 PathProgramCache]: Analyzing trace with hash 651179076, now seen corresponding path program 1 times [2022-03-19 09:18:02,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:02,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [499715212] [2022-03-19 09:18:02,845 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:02,845 INFO L85 PathProgramCache]: Analyzing trace with hash 651179076, now seen corresponding path program 2 times [2022-03-19 09:18:02,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:02,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958239727] [2022-03-19 09:18:02,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:02,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:02,852 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:02,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [803797548] [2022-03-19 09:18:02,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:18:02,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:02,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:02,854 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) [2022-03-19 09:18:02,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 09:18:02,898 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:18:02,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:02,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 09:18:02,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 09:18:03,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:03,178 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 09:18:03,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:03,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958239727] [2022-03-19 09:18:03,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:03,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803797548] [2022-03-19 09:18:03,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803797548] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:03,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:03,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-19 09:18:03,179 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:03,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [499715212] [2022-03-19 09:18:03,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [499715212] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:03,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:03,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-19 09:18:03,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179710527] [2022-03-19 09:18:03,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:03,180 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-19 09:18:03,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:03,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-19 09:18:03,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-19 09:18:03,180 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:03,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:03,246 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-03-19 09:18:03,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 09:18:03,248 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 48 [2022-03-19 09:18:03,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:03,248 INFO L225 Difference]: With dead ends: 87 [2022-03-19 09:18:03,248 INFO L226 Difference]: Without dead ends: 79 [2022-03-19 09:18:03,249 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-19 09:18:03,249 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:03,249 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 146 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:18:03,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-19 09:18:03,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2022-03-19 09:18:03,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 57 states have internal predecessors, (60), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-19 09:18:03,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 84 transitions. [2022-03-19 09:18:03,264 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 84 transitions. Word has length 48 [2022-03-19 09:18:03,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:03,264 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 84 transitions. [2022-03-19 09:18:03,264 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:03,264 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 84 transitions. [2022-03-19 09:18:03,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 09:18:03,265 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:03,265 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:03,281 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:03,481 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 [2022-03-19 09:18:03,481 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:03,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:03,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1154259258, now seen corresponding path program 3 times [2022-03-19 09:18:03,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:03,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [262345537] [2022-03-19 09:18:03,482 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:03,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1154259258, now seen corresponding path program 4 times [2022-03-19 09:18:03,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:03,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446854779] [2022-03-19 09:18:03,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:03,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:03,488 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:03,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [168182192] [2022-03-19 09:18:03,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:18:03,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:03,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:03,493 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) [2022-03-19 09:18:03,496 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 09:18:03,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:18:03,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:03,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-19 09:18:03,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:03,903 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:03,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:04,163 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-19 09:18:04,163 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:04,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446854779] [2022-03-19 09:18:04,163 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:04,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168182192] [2022-03-19 09:18:04,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168182192] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:04,163 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:04,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 24 [2022-03-19 09:18:04,164 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:04,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [262345537] [2022-03-19 09:18:04,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [262345537] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:04,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:04,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 09:18:04,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738724715] [2022-03-19 09:18:04,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:04,165 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 09:18:04,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:04,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 09:18:04,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:18:04,165 INFO L87 Difference]: Start difference. First operand 76 states and 84 transitions. Second operand has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:04,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:04,460 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-03-19 09:18:04,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 09:18:04,460 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 48 [2022-03-19 09:18:04,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:04,461 INFO L225 Difference]: With dead ends: 87 [2022-03-19 09:18:04,461 INFO L226 Difference]: Without dead ends: 79 [2022-03-19 09:18:04,462 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2022-03-19 09:18:04,462 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:04,462 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 260 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 09:18:04,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-19 09:18:04,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 73. [2022-03-19 09:18:04,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-19 09:18:04,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-19 09:18:04,477 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 48 [2022-03-19 09:18:04,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:04,492 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-19 09:18:04,492 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:04,492 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-19 09:18:04,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:04,493 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:04,493 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:04,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:04,693 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 [2022-03-19 09:18:04,693 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:04,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:04,694 INFO L85 PathProgramCache]: Analyzing trace with hash -463038031, now seen corresponding path program 5 times [2022-03-19 09:18:04,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:04,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1157893778] [2022-03-19 09:18:04,694 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:04,694 INFO L85 PathProgramCache]: Analyzing trace with hash -463038031, now seen corresponding path program 6 times [2022-03-19 09:18:04,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:04,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785299901] [2022-03-19 09:18:04,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:04,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:04,702 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:04,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1207902587] [2022-03-19 09:18:04,702 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:18:04,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:04,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:04,703 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) [2022-03-19 09:18:04,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 09:18:04,750 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 09:18:04,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:04,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 09:18:04,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:04,931 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:05,028 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:05,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:05,220 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 09:18:05,220 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:05,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785299901] [2022-03-19 09:18:05,221 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:05,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207902587] [2022-03-19 09:18:05,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207902587] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:05,221 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:05,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 19 [2022-03-19 09:18:05,221 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:05,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1157893778] [2022-03-19 09:18:05,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1157893778] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:05,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:05,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:18:05,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639291711] [2022-03-19 09:18:05,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:05,222 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:18:05,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:05,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:18:05,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2022-03-19 09:18:05,223 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:05,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:05,621 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2022-03-19 09:18:05,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:18:05,622 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:05,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:05,623 INFO L225 Difference]: With dead ends: 88 [2022-03-19 09:18:05,623 INFO L226 Difference]: Without dead ends: 84 [2022-03-19 09:18:05,623 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2022-03-19 09:18:05,623 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 17 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:05,624 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 277 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 09:18:05,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-19 09:18:05,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 75. [2022-03-19 09:18:05,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 55 states have internal predecessors, (61), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-19 09:18:05,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 83 transitions. [2022-03-19 09:18:05,637 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 83 transitions. Word has length 50 [2022-03-19 09:18:05,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:05,638 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 83 transitions. [2022-03-19 09:18:05,638 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:05,638 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 83 transitions. [2022-03-19 09:18:05,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:05,638 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:05,638 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:05,655 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-19 09:18:05,851 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 [2022-03-19 09:18:05,851 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:05,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:05,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1311969331, now seen corresponding path program 5 times [2022-03-19 09:18:05,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:05,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [624528352] [2022-03-19 09:18:05,852 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:05,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1311969331, now seen corresponding path program 6 times [2022-03-19 09:18:05,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:05,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743269818] [2022-03-19 09:18:05,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:05,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:05,858 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:05,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [793405469] [2022-03-19 09:18:05,858 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:18:05,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:05,859 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:05,867 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) [2022-03-19 09:18:05,868 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 09:18:05,903 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 09:18:05,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:05,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-19 09:18:05,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:06,188 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:06,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 09:18:06,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:06,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743269818] [2022-03-19 09:18:06,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:06,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793405469] [2022-03-19 09:18:06,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793405469] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:06,571 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:06,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 20 [2022-03-19 09:18:06,572 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:06,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [624528352] [2022-03-19 09:18:06,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [624528352] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:06,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:06,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 09:18:06,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16261446] [2022-03-19 09:18:06,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:06,572 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 09:18:06,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:06,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 09:18:06,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-03-19 09:18:06,573 INFO L87 Difference]: Start difference. First operand 75 states and 83 transitions. Second operand has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:08,663 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:18:10,749 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:18:12,769 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 [] [2022-03-19 09:18:13,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:13,034 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2022-03-19 09:18:13,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:18:13,034 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:13,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:13,035 INFO L225 Difference]: With dead ends: 88 [2022-03-19 09:18:13,035 INFO L226 Difference]: Without dead ends: 86 [2022-03-19 09:18:13,035 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:18:13,036 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 19 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 4 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:13,036 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 281 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 355 Invalid, 3 Unknown, 0 Unchecked, 6.3s Time] [2022-03-19 09:18:13,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-19 09:18:13,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 82. [2022-03-19 09:18:13,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 59 states have (on average 1.11864406779661) internal successors, (66), 61 states have internal predecessors, (66), 13 states have call successors, (13), 10 states have call predecessors, (13), 9 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-19 09:18:13,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2022-03-19 09:18:13,048 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 50 [2022-03-19 09:18:13,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:13,049 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2022-03-19 09:18:13,049 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:13,049 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2022-03-19 09:18:13,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:13,049 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:13,049 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:13,068 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:13,250 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 [2022-03-19 09:18:13,250 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:13,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:13,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1484106385, now seen corresponding path program 7 times [2022-03-19 09:18:13,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:13,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [593254028] [2022-03-19 09:18:13,251 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:13,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1484106385, now seen corresponding path program 8 times [2022-03-19 09:18:13,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:13,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301825635] [2022-03-19 09:18:13,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:13,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:13,258 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:13,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1195708561] [2022-03-19 09:18:13,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:18:13,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:13,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:13,264 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) [2022-03-19 09:18:13,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 09:18:13,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:18:13,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:13,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-19 09:18:13,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:13,498 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:13,500 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:13,501 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:13,506 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:13,507 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:28,336 WARN L232 SmtUtils]: Spent 5.12s on a formula simplification. DAG size of input: 20 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-03-19 09:18:31,429 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:31,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:32,123 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 09:18:32,123 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:32,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301825635] [2022-03-19 09:18:32,123 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:32,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195708561] [2022-03-19 09:18:32,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195708561] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:32,123 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:32,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 21 [2022-03-19 09:18:32,123 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:32,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [593254028] [2022-03-19 09:18:32,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [593254028] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:32,124 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:32,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 09:18:32,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098720360] [2022-03-19 09:18:32,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:32,124 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 09:18:32,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:32,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 09:18:32,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=364, Unknown=1, NotChecked=0, Total=420 [2022-03-19 09:18:32,125 INFO L87 Difference]: Start difference. First operand 82 states and 90 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:35,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:35,905 INFO L93 Difference]: Finished difference Result 96 states and 106 transitions. [2022-03-19 09:18:35,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:18:35,905 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:35,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:35,906 INFO L225 Difference]: With dead ends: 96 [2022-03-19 09:18:35,906 INFO L226 Difference]: Without dead ends: 94 [2022-03-19 09:18:35,906 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=88, Invalid=561, Unknown=1, NotChecked=0, Total=650 [2022-03-19 09:18:35,907 INFO L912 BasicCegarLoop]: 28 mSDtfsCounter, 17 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:35,907 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 315 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 314 Invalid, 0 Unknown, 29 Unchecked, 0.4s Time] [2022-03-19 09:18:35,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-19 09:18:35,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2022-03-19 09:18:35,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 63 states have (on average 1.126984126984127) internal successors, (71), 65 states have internal predecessors, (71), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-19 09:18:35,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2022-03-19 09:18:35,926 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 50 [2022-03-19 09:18:35,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:35,926 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2022-03-19 09:18:35,926 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:35,926 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2022-03-19 09:18:35,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:35,927 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:35,927 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:35,946 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:36,144 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 [2022-03-19 09:18:36,144 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:36,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:36,144 INFO L85 PathProgramCache]: Analyzing trace with hash 290900977, now seen corresponding path program 9 times [2022-03-19 09:18:36,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:36,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [556274113] [2022-03-19 09:18:36,145 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:36,145 INFO L85 PathProgramCache]: Analyzing trace with hash 290900977, now seen corresponding path program 10 times [2022-03-19 09:18:36,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:36,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075527061] [2022-03-19 09:18:36,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:36,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:36,150 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:36,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1317007757] [2022-03-19 09:18:36,150 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:18:36,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:36,150 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:36,151 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) [2022-03-19 09:18:36,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 09:18:36,183 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:18:36,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:36,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-19 09:18:36,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:36,280 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 09:18:36,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:36,372 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 09:18:36,373 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:36,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075527061] [2022-03-19 09:18:36,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:36,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317007757] [2022-03-19 09:18:36,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317007757] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:36,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:36,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-19 09:18:36,373 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:36,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [556274113] [2022-03-19 09:18:36,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [556274113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:36,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:36,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:18:36,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330453371] [2022-03-19 09:18:36,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:36,374 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:18:36,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:36,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:18:36,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-19 09:18:36,374 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:36,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:36,433 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2022-03-19 09:18:36,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:18:36,433 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:36,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:36,434 INFO L225 Difference]: With dead ends: 121 [2022-03-19 09:18:36,434 INFO L226 Difference]: Without dead ends: 108 [2022-03-19 09:18:36,434 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2022-03-19 09:18:36,435 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:36,435 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 105 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:18:36,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-19 09:18:36,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2022-03-19 09:18:36,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 76 states have (on average 1.131578947368421) internal successors, (86), 79 states have internal predecessors, (86), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-19 09:18:36,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 120 transitions. [2022-03-19 09:18:36,455 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 120 transitions. Word has length 50 [2022-03-19 09:18:36,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:36,455 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 120 transitions. [2022-03-19 09:18:36,455 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:36,455 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 120 transitions. [2022-03-19 09:18:36,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:36,456 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:36,456 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:36,474 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:36,672 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 [2022-03-19 09:18:36,673 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:36,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:36,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1452517941, now seen corresponding path program 11 times [2022-03-19 09:18:36,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:36,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1742546794] [2022-03-19 09:18:36,673 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:36,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1452517941, now seen corresponding path program 12 times [2022-03-19 09:18:36,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:36,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989774618] [2022-03-19 09:18:36,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:36,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:36,679 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:36,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [940921341] [2022-03-19 09:18:36,679 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:18:36,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:36,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:36,680 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) [2022-03-19 09:18:36,681 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 09:18:36,720 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 09:18:36,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:36,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-19 09:18:36,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:37,080 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-19 09:18:37,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:37,461 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 09:18:37,462 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:37,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989774618] [2022-03-19 09:18:37,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:37,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940921341] [2022-03-19 09:18:37,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940921341] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:37,462 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:37,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 21 [2022-03-19 09:18:37,462 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:37,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1742546794] [2022-03-19 09:18:37,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1742546794] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:37,462 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:37,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 09:18:37,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696533874] [2022-03-19 09:18:37,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:37,463 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 09:18:37,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:37,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 09:18:37,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-03-19 09:18:37,463 INFO L87 Difference]: Start difference. First operand 104 states and 120 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:37,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:37,687 INFO L93 Difference]: Finished difference Result 117 states and 135 transitions. [2022-03-19 09:18:37,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:18:37,693 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:37,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:37,694 INFO L225 Difference]: With dead ends: 117 [2022-03-19 09:18:37,694 INFO L226 Difference]: Without dead ends: 115 [2022-03-19 09:18:37,694 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:18:37,695 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 22 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:37,695 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 315 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 09:18:37,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-03-19 09:18:37,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2022-03-19 09:18:37,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 81 states have (on average 1.123456790123457) internal successors, (91), 85 states have internal predecessors, (91), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (17), 14 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-19 09:18:37,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 127 transitions. [2022-03-19 09:18:37,718 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 127 transitions. Word has length 50 [2022-03-19 09:18:37,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:37,719 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 127 transitions. [2022-03-19 09:18:37,719 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:37,719 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 127 transitions. [2022-03-19 09:18:37,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:37,719 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:37,719 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:37,738 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:37,931 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 [2022-03-19 09:18:37,931 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:37,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:37,931 INFO L85 PathProgramCache]: Analyzing trace with hash -1343557775, now seen corresponding path program 13 times [2022-03-19 09:18:37,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:37,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [543885658] [2022-03-19 09:18:37,932 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:37,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1343557775, now seen corresponding path program 14 times [2022-03-19 09:18:37,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:37,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442063420] [2022-03-19 09:18:37,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:37,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:37,938 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:37,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1523150055] [2022-03-19 09:18:37,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:18:37,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:37,939 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:37,940 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) [2022-03-19 09:18:37,941 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 09:18:37,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:18:37,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:38,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-19 09:18:38,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:38,346 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:38,348 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:38,353 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:38,597 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:38,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:39,279 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 09:18:39,279 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:39,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442063420] [2022-03-19 09:18:39,280 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:39,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523150055] [2022-03-19 09:18:39,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523150055] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:39,280 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:39,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 22 [2022-03-19 09:18:39,280 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:39,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [543885658] [2022-03-19 09:18:39,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [543885658] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:39,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:39,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 09:18:39,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337461162] [2022-03-19 09:18:39,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:39,281 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 09:18:39,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:39,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 09:18:39,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2022-03-19 09:18:39,281 INFO L87 Difference]: Start difference. First operand 111 states and 127 transitions. Second operand has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:40,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:40,109 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2022-03-19 09:18:40,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 09:18:40,109 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:40,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:40,110 INFO L225 Difference]: With dead ends: 134 [2022-03-19 09:18:40,110 INFO L226 Difference]: Without dead ends: 121 [2022-03-19 09:18:40,111 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:18:40,111 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:40,111 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 278 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 09:18:40,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-19 09:18:40,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-03-19 09:18:40,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 89 states have (on average 1.1235955056179776) internal successors, (100), 93 states have internal predecessors, (100), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:18:40,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 138 transitions. [2022-03-19 09:18:40,140 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 138 transitions. Word has length 50 [2022-03-19 09:18:40,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:40,140 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 138 transitions. [2022-03-19 09:18:40,140 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:40,140 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 138 transitions. [2022-03-19 09:18:40,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:18:40,141 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:40,141 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:40,157 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:40,343 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 [2022-03-19 09:18:40,343 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:40,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:40,343 INFO L85 PathProgramCache]: Analyzing trace with hash 431449587, now seen corresponding path program 5 times [2022-03-19 09:18:40,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:40,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [38711623] [2022-03-19 09:18:40,344 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:40,344 INFO L85 PathProgramCache]: Analyzing trace with hash 431449587, now seen corresponding path program 6 times [2022-03-19 09:18:40,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:40,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728806264] [2022-03-19 09:18:40,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:40,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:40,348 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:40,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1965324644] [2022-03-19 09:18:40,349 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:18:40,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:40,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:40,350 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) [2022-03-19 09:18:40,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 09:18:40,396 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 09:18:40,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:40,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-19 09:18:40,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:40,904 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 09:18:40,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:41,069 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 09:18:41,069 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:41,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728806264] [2022-03-19 09:18:41,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:41,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965324644] [2022-03-19 09:18:41,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965324644] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:41,070 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:41,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 22 [2022-03-19 09:18:41,071 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:41,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [38711623] [2022-03-19 09:18:41,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [38711623] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:41,071 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:41,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 09:18:41,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114927024] [2022-03-19 09:18:41,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:41,071 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 09:18:41,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:41,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 09:18:41,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2022-03-19 09:18:41,072 INFO L87 Difference]: Start difference. First operand 121 states and 138 transitions. Second operand has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:41,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:41,382 INFO L93 Difference]: Finished difference Result 142 states and 159 transitions. [2022-03-19 09:18:41,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 09:18:41,383 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-19 09:18:41,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:41,383 INFO L225 Difference]: With dead ends: 142 [2022-03-19 09:18:41,383 INFO L226 Difference]: Without dead ends: 140 [2022-03-19 09:18:41,384 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:18:41,384 INFO L912 BasicCegarLoop]: 28 mSDtfsCounter, 18 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:41,384 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 332 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 09:18:41,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-03-19 09:18:41,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 129. [2022-03-19 09:18:41,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 95 states have (on average 1.1157894736842104) internal successors, (106), 99 states have internal predecessors, (106), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:18:41,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2022-03-19 09:18:41,419 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 50 [2022-03-19 09:18:41,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:41,419 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2022-03-19 09:18:41,420 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:18:41,420 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2022-03-19 09:18:41,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-19 09:18:41,420 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:41,420 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:41,437 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 09:18:41,623 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 [2022-03-19 09:18:41,624 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:41,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:41,624 INFO L85 PathProgramCache]: Analyzing trace with hash 850213676, now seen corresponding path program 3 times [2022-03-19 09:18:41,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:41,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1408897720] [2022-03-19 09:18:41,625 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:41,625 INFO L85 PathProgramCache]: Analyzing trace with hash 850213676, now seen corresponding path program 4 times [2022-03-19 09:18:41,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:41,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032407740] [2022-03-19 09:18:41,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:41,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:41,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:41,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1900051938] [2022-03-19 09:18:41,630 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:18:41,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:41,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:41,633 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) [2022-03-19 09:18:41,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 09:18:41,663 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:18:41,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:41,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 09:18:41,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:41,830 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:18:41,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:18:42,027 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:18:42,027 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:18:42,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032407740] [2022-03-19 09:18:42,027 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:18:42,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900051938] [2022-03-19 09:18:42,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900051938] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:18:42,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:18:42,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-03-19 09:18:42,028 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:18:42,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1408897720] [2022-03-19 09:18:42,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1408897720] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:18:42,028 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:18:42,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 09:18:42,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496938294] [2022-03-19 09:18:42,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:18:42,028 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 09:18:42,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:42,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 09:18:42,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-19 09:18:42,029 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:18:42,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:18:42,135 INFO L93 Difference]: Finished difference Result 140 states and 155 transitions. [2022-03-19 09:18:42,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 09:18:42,135 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2022-03-19 09:18:42,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:18:42,136 INFO L225 Difference]: With dead ends: 140 [2022-03-19 09:18:42,136 INFO L226 Difference]: Without dead ends: 132 [2022-03-19 09:18:42,136 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-19 09:18:42,137 INFO L912 BasicCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:18:42,137 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 175 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:18:42,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-19 09:18:42,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2022-03-19 09:18:42,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 96 states have (on average 1.1145833333333333) internal successors, (107), 99 states have internal predecessors, (107), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:18:42,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 145 transitions. [2022-03-19 09:18:42,161 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 145 transitions. Word has length 57 [2022-03-19 09:18:42,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:18:42,161 INFO L478 AbstractCegarLoop]: Abstraction has 130 states and 145 transitions. [2022-03-19 09:18:42,161 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:18:42,162 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 145 transitions. [2022-03-19 09:18:42,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-19 09:18:42,162 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:18:42,162 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:18:42,191 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-19 09:18:42,378 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 [2022-03-19 09:18:42,379 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:18:42,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:18:42,379 INFO L85 PathProgramCache]: Analyzing trace with hash 55892592, now seen corresponding path program 5 times [2022-03-19 09:18:42,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:18:42,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [816080577] [2022-03-19 09:18:42,380 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:18:42,380 INFO L85 PathProgramCache]: Analyzing trace with hash 55892592, now seen corresponding path program 6 times [2022-03-19 09:18:42,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:18:42,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611865644] [2022-03-19 09:18:42,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:18:42,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:18:42,399 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:18:42,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [543667721] [2022-03-19 09:18:42,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:18:42,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:18:42,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:18:42,400 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) [2022-03-19 09:18:42,403 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 09:18:42,773 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-19 09:18:42,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:18:42,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 09:18:42,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:18:43,674 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:43,676 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:18:43,677 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:19:00,641 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 25 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-03-19 09:19:00,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:19:01,825 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:19:03,021 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:19:35,106 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 09:19:35,106 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:19:35,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611865644] [2022-03-19 09:19:35,107 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:19:35,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543667721] [2022-03-19 09:19:35,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543667721] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:19:35,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:19:35,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13] total 27 [2022-03-19 09:19:35,107 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:19:35,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [816080577] [2022-03-19 09:19:35,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [816080577] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:19:35,107 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:19:35,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 09:19:35,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521597647] [2022-03-19 09:19:35,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:19:35,108 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 09:19:35,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:19:35,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 09:19:35,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=585, Unknown=4, NotChecked=0, Total=702 [2022-03-19 09:19:35,108 INFO L87 Difference]: Start difference. First operand 130 states and 145 transitions. Second operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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) [2022-03-19 09:19:41,334 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:19:46,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:20:06,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-19 09:20:13,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:20:13,157 INFO L93 Difference]: Finished difference Result 145 states and 162 transitions. [2022-03-19 09:20:13,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-19 09:20:13,158 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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 57 [2022-03-19 09:20:13,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:20:13,159 INFO L225 Difference]: With dead ends: 145 [2022-03-19 09:20:13,159 INFO L226 Difference]: Without dead ends: 135 [2022-03-19 09:20:13,159 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 48.8s TimeCoverageRelationStatistics Valid=361, Invalid=1614, Unknown=5, NotChecked=0, Total=1980 [2022-03-19 09:20:13,160 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 24 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2022-03-19 09:20:13,160 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 175 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 377 Invalid, 1 Unknown, 0 Unchecked, 10.4s Time] [2022-03-19 09:20:13,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-03-19 09:20:13,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 128. [2022-03-19 09:20:13,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 99 states have internal predecessors, (103), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:20:13,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 141 transitions. [2022-03-19 09:20:13,185 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 141 transitions. Word has length 57 [2022-03-19 09:20:13,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:20:13,185 INFO L478 AbstractCegarLoop]: Abstraction has 128 states and 141 transitions. [2022-03-19 09:20:13,185 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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) [2022-03-19 09:20:13,185 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 141 transitions. [2022-03-19 09:20:13,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-19 09:20:13,186 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:20:13,186 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:20:13,191 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 09:20:13,390 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 [2022-03-19 09:20:13,390 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:20:13,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:20:13,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1124973290, now seen corresponding path program 7 times [2022-03-19 09:20:13,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:20:13,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1663241603] [2022-03-19 09:20:13,391 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:20:13,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1124973290, now seen corresponding path program 8 times [2022-03-19 09:20:13,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:20:13,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578396960] [2022-03-19 09:20:13,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:20:13,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:20:13,396 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:20:13,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [261347240] [2022-03-19 09:20:13,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:20:13,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:20:13,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:20:13,400 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) [2022-03-19 09:20:13,402 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 09:20:13,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:20:13,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:20:13,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 09:20:13,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:20:15,938 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:20:15,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:20:19,054 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:20:19,054 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:20:19,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578396960] [2022-03-19 09:20:19,054 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:20:19,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261347240] [2022-03-19 09:20:19,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261347240] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:20:19,054 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:20:19,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 23 [2022-03-19 09:20:19,054 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:20:19,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1663241603] [2022-03-19 09:20:19,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1663241603] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:20:19,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:20:19,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 09:20:19,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526940706] [2022-03-19 09:20:19,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:20:19,055 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 09:20:19,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:20:19,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 09:20:19,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2022-03-19 09:20:19,056 INFO L87 Difference]: Start difference. First operand 128 states and 141 transitions. Second operand has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:20:21,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:20:21,156 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2022-03-19 09:20:21,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 09:20:21,156 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2022-03-19 09:20:21,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:20:21,157 INFO L225 Difference]: With dead ends: 141 [2022-03-19 09:20:21,157 INFO L226 Difference]: Without dead ends: 133 [2022-03-19 09:20:21,158 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-03-19 09:20:21,158 INFO L912 BasicCegarLoop]: 35 mSDtfsCounter, 9 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-19 09:20:21,158 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 294 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-19 09:20:21,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-03-19 09:20:21,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2022-03-19 09:20:21,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 97 states have (on average 1.092783505154639) internal successors, (106), 102 states have internal predecessors, (106), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-19 09:20:21,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 146 transitions. [2022-03-19 09:20:21,196 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 146 transitions. Word has length 57 [2022-03-19 09:20:21,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:20:21,196 INFO L478 AbstractCegarLoop]: Abstraction has 132 states and 146 transitions. [2022-03-19 09:20:21,196 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:20:21,196 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 146 transitions. [2022-03-19 09:20:21,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-19 09:20:21,197 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:20:21,197 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:20:21,215 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-19 09:20:21,416 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 [2022-03-19 09:20:21,416 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:20:21,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:20:21,417 INFO L85 PathProgramCache]: Analyzing trace with hash -680465044, now seen corresponding path program 5 times [2022-03-19 09:20:21,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:20:21,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2038602327] [2022-03-19 09:20:21,417 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:20:21,417 INFO L85 PathProgramCache]: Analyzing trace with hash -680465044, now seen corresponding path program 6 times [2022-03-19 09:20:21,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:20:21,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321957478] [2022-03-19 09:20:21,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:20:21,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:20:21,422 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:20:21,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [809642168] [2022-03-19 09:20:21,422 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:20:21,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:20:21,422 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:20:21,423 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) [2022-03-19 09:20:21,424 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 09:20:21,818 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-19 09:20:21,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:20:21,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-19 09:20:21,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:20:23,018 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:20:23,020 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:20:23,021 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:20:33,276 WARN L833 $PredicateComparison]: unable to prove that (and (let ((.cse3 (+ c_main_~X~0 1)) (.cse2 (+ (* (- 1) c_main_~Y~0) (div (+ c_main_~v~0 c_main_~X~0) 2) (* c_main_~X~0 c_main_~y~0))) (.cse0 (= c_main_~Y~0 0)) (.cse4 (= (mod (+ (* 2 c_main_~X~0 c_main_~y~0) c_main_~v~0 c_main_~X~0) 2) 0))) (or (let ((.cse1 (div .cse2 c_main_~Y~0))) (and (not .cse0) (not (<= .cse1 c_main_~X~0)) (= (mod .cse2 c_main_~Y~0) 0) (= c_main_~xy~0 (* c_main_~y~0 .cse1)) (<= .cse1 .cse3) (= c_main_~yx~0 (* c_main_~Y~0 .cse1)) .cse4)) (and (let ((.cse6 (= c_main_~y~0 0))) (or (let ((.cse5 (div c_main_~xy~0 c_main_~y~0))) (and (<= .cse5 .cse3) (= (mod c_main_~xy~0 c_main_~y~0) 0) (not .cse6) (< c_main_~X~0 .cse5))) (and .cse6 (= c_main_~xy~0 0)))) (= 0 .cse2) .cse0 (= c_main_~yx~0 0) .cse4))) (<= 0 c_main_~X~0)) is different from false [2022-03-19 09:20:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-19 09:20:58,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:21:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 09:21:00,674 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:21:00,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321957478] [2022-03-19 09:21:00,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:21:00,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809642168] [2022-03-19 09:21:00,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809642168] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:21:00,674 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:21:00,674 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2022-03-19 09:21:00,674 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:21:00,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2038602327] [2022-03-19 09:21:00,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2038602327] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:21:00,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:21:00,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:21:00,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156252368] [2022-03-19 09:21:00,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:21:00,675 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:21:00,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:00,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:21:00,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=313, Unknown=1, NotChecked=36, Total=420 [2022-03-19 09:21:00,676 INFO L87 Difference]: Start difference. First operand 132 states and 146 transitions. Second operand has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:21:04,435 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse7 (* c_main_~X~0 c_main_~y~0)) (.cse3 (+ c_main_~X~0 1))) (and (let ((.cse2 (+ (* (- 1) c_main_~Y~0) (div (+ c_main_~v~0 c_main_~X~0) 2) .cse7)) (.cse0 (= c_main_~Y~0 0)) (.cse4 (= (mod (+ (* 2 c_main_~X~0 c_main_~y~0) c_main_~v~0 c_main_~X~0) 2) 0))) (or (let ((.cse1 (div .cse2 c_main_~Y~0))) (and (not .cse0) (not (<= .cse1 c_main_~X~0)) (= (mod .cse2 c_main_~Y~0) 0) (= c_main_~xy~0 (* c_main_~y~0 .cse1)) (<= .cse1 .cse3) (= c_main_~yx~0 (* c_main_~Y~0 .cse1)) .cse4)) (and (let ((.cse6 (= c_main_~y~0 0))) (or (let ((.cse5 (div c_main_~xy~0 c_main_~y~0))) (and (<= .cse5 .cse3) (= (mod c_main_~xy~0 c_main_~y~0) 0) (not .cse6) (< c_main_~X~0 .cse5))) (and .cse6 (= c_main_~xy~0 0)))) (= 0 .cse2) .cse0 (= c_main_~yx~0 0) .cse4))) (<= 0 c_main_~X~0) (not (<= c_main_~x~0 c_main_~X~0)) (= (+ (* 2 (* c_main_~Y~0 c_main_~x~0)) (* 2 c_main_~Y~0)) (+ (* 2 .cse7) c_main_~v~0 c_main_~X~0)) (<= c_main_~x~0 .cse3))) is different from false [2022-03-19 09:21:04,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:21:04,645 INFO L93 Difference]: Finished difference Result 139 states and 152 transitions. [2022-03-19 09:21:04,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:21:04,647 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 57 [2022-03-19 09:21:04,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:21:04,648 INFO L225 Difference]: With dead ends: 139 [2022-03-19 09:21:04,648 INFO L226 Difference]: Without dead ends: 131 [2022-03-19 09:21:04,648 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=170, Invalid=648, Unknown=2, NotChecked=110, Total=930 [2022-03-19 09:21:04,649 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 21 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 09:21:04,649 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 166 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 119 Invalid, 0 Unknown, 24 Unchecked, 0.6s Time] [2022-03-19 09:21:04,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-19 09:21:04,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2022-03-19 09:21:04,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.086021505376344) internal successors, (101), 97 states have internal predecessors, (101), 19 states have call successors, (19), 14 states have call predecessors, (19), 13 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:21:04,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 138 transitions. [2022-03-19 09:21:04,685 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 138 transitions. Word has length 57 [2022-03-19 09:21:04,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:21:04,685 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 138 transitions. [2022-03-19 09:21:04,685 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-19 09:21:04,685 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 138 transitions. [2022-03-19 09:21:04,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:21:04,685 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:21:04,686 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:21:04,691 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-19 09:21:04,890 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 [2022-03-19 09:21:04,891 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:21:04,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:21:04,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1830651545, now seen corresponding path program 7 times [2022-03-19 09:21:04,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:04,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2079221374] [2022-03-19 09:21:04,891 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:21:04,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1830651545, now seen corresponding path program 8 times [2022-03-19 09:21:04,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:21:04,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249008446] [2022-03-19 09:21:04,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:21:04,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:21:04,897 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:21:04,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1340847154] [2022-03-19 09:21:04,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:21:04,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:21:04,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:21:04,901 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) [2022-03-19 09:21:04,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 09:21:04,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:21:04,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:21:04,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-19 09:21:04,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:21:07,759 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:21:08,550 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-19 09:21:08,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:21:10,536 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-19 09:21:10,537 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:21:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249008446] [2022-03-19 09:21:10,537 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:21:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340847154] [2022-03-19 09:21:10,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340847154] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:21:10,537 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:21:10,537 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 24 [2022-03-19 09:21:10,537 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:21:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2079221374] [2022-03-19 09:21:10,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2079221374] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:21:10,537 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:21:10,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 09:21:10,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573836685] [2022-03-19 09:21:10,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:21:10,538 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 09:21:10,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:10,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 09:21:10,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:21:10,538 INFO L87 Difference]: Start difference. First operand 126 states and 138 transitions. Second operand has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:14,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:21:14,338 INFO L93 Difference]: Finished difference Result 143 states and 156 transitions. [2022-03-19 09:21:14,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 09:21:14,340 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:21:14,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:21:14,340 INFO L225 Difference]: With dead ends: 143 [2022-03-19 09:21:14,340 INFO L226 Difference]: Without dead ends: 141 [2022-03-19 09:21:14,341 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2022-03-19 09:21:14,341 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:21:14,341 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 333 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-03-19 09:21:14,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-03-19 09:21:14,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2022-03-19 09:21:14,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 103 states have (on average 1.087378640776699) internal successors, (112), 107 states have internal predecessors, (112), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-19 09:21:14,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 151 transitions. [2022-03-19 09:21:14,372 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 151 transitions. Word has length 59 [2022-03-19 09:21:14,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:21:14,372 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 151 transitions. [2022-03-19 09:21:14,372 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:14,372 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 151 transitions. [2022-03-19 09:21:14,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:21:14,373 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:21:14,373 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:21:14,390 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-19 09:21:14,590 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 [2022-03-19 09:21:14,590 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:21:14,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:21:14,591 INFO L85 PathProgramCache]: Analyzing trace with hash -689308389, now seen corresponding path program 15 times [2022-03-19 09:21:14,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:14,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1593799516] [2022-03-19 09:21:14,591 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:21:14,591 INFO L85 PathProgramCache]: Analyzing trace with hash -689308389, now seen corresponding path program 16 times [2022-03-19 09:21:14,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:21:14,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267257557] [2022-03-19 09:21:14,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:21:14,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:21:14,598 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:21:14,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087135328] [2022-03-19 09:21:14,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:21:14,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:21:14,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:21:14,599 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) [2022-03-19 09:21:14,601 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 09:21:14,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:21:14,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:21:14,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-19 09:21:14,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:21:17,793 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:21:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-19 09:21:18,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:21:20,671 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-19 09:21:20,672 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:21:20,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267257557] [2022-03-19 09:21:20,672 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:21:20,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087135328] [2022-03-19 09:21:20,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087135328] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:21:20,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:21:20,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 26 [2022-03-19 09:21:20,672 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:21:20,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1593799516] [2022-03-19 09:21:20,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1593799516] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:21:20,672 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:21:20,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 09:21:20,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3907272] [2022-03-19 09:21:20,673 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:21:20,673 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 09:21:20,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:20,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 09:21:20,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:21:20,673 INFO L87 Difference]: Start difference. First operand 139 states and 151 transitions. Second operand has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:24,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:21:24,254 INFO L93 Difference]: Finished difference Result 150 states and 162 transitions. [2022-03-19 09:21:24,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 09:21:24,255 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:21:24,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:21:24,256 INFO L225 Difference]: With dead ends: 150 [2022-03-19 09:21:24,256 INFO L226 Difference]: Without dead ends: 148 [2022-03-19 09:21:24,256 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-03-19 09:21:24,256 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-03-19 09:21:24,256 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 304 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-03-19 09:21:24,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-19 09:21:24,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2022-03-19 09:21:24,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 108 states have (on average 1.0833333333333333) internal successors, (117), 113 states have internal predecessors, (117), 21 states have call successors, (21), 17 states have call predecessors, (21), 16 states have return successors, (20), 15 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-19 09:21:24,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 158 transitions. [2022-03-19 09:21:24,284 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 158 transitions. Word has length 59 [2022-03-19 09:21:24,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:21:24,284 INFO L478 AbstractCegarLoop]: Abstraction has 146 states and 158 transitions. [2022-03-19 09:21:24,284 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:24,284 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 158 transitions. [2022-03-19 09:21:24,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:21:24,285 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:21:24,285 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:21:24,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-19 09:21:24,499 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 [2022-03-19 09:21:24,499 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:21:24,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:21:24,500 INFO L85 PathProgramCache]: Analyzing trace with hash 809583191, now seen corresponding path program 17 times [2022-03-19 09:21:24,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:24,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [732329068] [2022-03-19 09:21:24,500 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:21:24,500 INFO L85 PathProgramCache]: Analyzing trace with hash 809583191, now seen corresponding path program 18 times [2022-03-19 09:21:24,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:21:24,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82847244] [2022-03-19 09:21:24,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:21:24,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:21:24,504 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:21:24,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1884645468] [2022-03-19 09:21:24,505 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:21:24,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:21:24,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:21:24,520 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) [2022-03-19 09:21:24,561 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 09:21:24,575 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-19 09:21:24,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:21:24,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 51 conjunts are in the unsatisfiable core [2022-03-19 09:21:24,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:21:27,560 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 40 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 09:21:27,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:21:29,203 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-19 09:21:29,203 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:21:29,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82847244] [2022-03-19 09:21:29,203 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:21:29,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884645468] [2022-03-19 09:21:29,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884645468] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:21:29,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:21:29,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10] total 23 [2022-03-19 09:21:29,204 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:21:29,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [732329068] [2022-03-19 09:21:29,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [732329068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:21:29,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:21:29,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 09:21:29,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608487246] [2022-03-19 09:21:29,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:21:29,204 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 09:21:29,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:29,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 09:21:29,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2022-03-19 09:21:29,205 INFO L87 Difference]: Start difference. First operand 146 states and 158 transitions. Second operand has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:32,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:21:32,320 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2022-03-19 09:21:32,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 09:21:32,321 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:21:32,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:21:32,321 INFO L225 Difference]: With dead ends: 163 [2022-03-19 09:21:32,321 INFO L226 Difference]: Without dead ends: 161 [2022-03-19 09:21:32,322 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 92 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:21:32,322 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 17 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-03-19 09:21:32,322 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 309 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-03-19 09:21:32,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-03-19 09:21:32,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 136. [2022-03-19 09:21:32,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 104 states have internal predecessors, (110), 19 states have call successors, (19), 16 states have call predecessors, (19), 15 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 09:21:32,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 147 transitions. [2022-03-19 09:21:32,356 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 147 transitions. Word has length 59 [2022-03-19 09:21:32,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:21:32,356 INFO L478 AbstractCegarLoop]: Abstraction has 136 states and 147 transitions. [2022-03-19 09:21:32,357 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:32,357 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 147 transitions. [2022-03-19 09:21:32,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:21:32,358 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:21:32,358 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:21:32,374 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-19 09:21:32,573 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 [2022-03-19 09:21:32,573 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:21:32,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:21:32,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1971200155, now seen corresponding path program 19 times [2022-03-19 09:21:32,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:32,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [599272078] [2022-03-19 09:21:32,574 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:21:32,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1971200155, now seen corresponding path program 20 times [2022-03-19 09:21:32,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:21:32,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875177289] [2022-03-19 09:21:32,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:21:32,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:21:32,578 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:21:32,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1947087093] [2022-03-19 09:21:32,578 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:21:32,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:21:32,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:21:32,588 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) [2022-03-19 09:21:32,589 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 09:21:32,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:21:32,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:21:32,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-19 09:21:32,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:21:35,707 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:21:38,793 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:21:43,828 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-19 09:21:43,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:21:45,896 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-19 09:21:45,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:21:45,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875177289] [2022-03-19 09:21:45,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:21:45,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947087093] [2022-03-19 09:21:45,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947087093] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:21:45,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:21:45,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 28 [2022-03-19 09:21:45,897 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:21:45,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [599272078] [2022-03-19 09:21:45,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [599272078] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:21:45,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:21:45,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 09:21:45,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860396357] [2022-03-19 09:21:45,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:21:45,898 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 09:21:45,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:45,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 09:21:45,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=661, Unknown=2, NotChecked=0, Total=756 [2022-03-19 09:21:45,898 INFO L87 Difference]: Start difference. First operand 136 states and 147 transitions. Second operand has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:49,299 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 [] [2022-03-19 09:21:52,099 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 [] [2022-03-19 09:21:55,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:21:55,315 INFO L93 Difference]: Finished difference Result 161 states and 175 transitions. [2022-03-19 09:21:55,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 09:21:55,317 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:21:55,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:21:55,317 INFO L225 Difference]: With dead ends: 161 [2022-03-19 09:21:55,318 INFO L226 Difference]: Without dead ends: 159 [2022-03-19 09:21:55,318 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=137, Invalid=983, Unknown=2, NotChecked=0, Total=1122 [2022-03-19 09:21:55,318 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 15 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2022-03-19 09:21:55,318 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 220 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 646 Invalid, 2 Unknown, 0 Unchecked, 7.8s Time] [2022-03-19 09:21:55,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-03-19 09:21:55,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 150. [2022-03-19 09:21:55,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 112 states have (on average 1.0892857142857142) internal successors, (122), 115 states have internal predecessors, (122), 21 states have call successors, (21), 17 states have call predecessors, (21), 16 states have return successors, (20), 17 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-19 09:21:55,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 163 transitions. [2022-03-19 09:21:55,352 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 163 transitions. Word has length 59 [2022-03-19 09:21:55,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:21:55,352 INFO L478 AbstractCegarLoop]: Abstraction has 150 states and 163 transitions. [2022-03-19 09:21:55,352 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:21:55,353 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 163 transitions. [2022-03-19 09:21:55,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:21:55,353 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:21:55,353 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:21:55,370 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-19 09:21:55,570 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 [2022-03-19 09:21:55,570 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:21:55,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:21:55,570 INFO L85 PathProgramCache]: Analyzing trace with hash -548759779, now seen corresponding path program 21 times [2022-03-19 09:21:55,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:21:55,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1060719547] [2022-03-19 09:21:55,571 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:21:55,571 INFO L85 PathProgramCache]: Analyzing trace with hash -548759779, now seen corresponding path program 22 times [2022-03-19 09:21:55,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:21:55,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598485838] [2022-03-19 09:21:55,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:21:55,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:21:55,575 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:21:55,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [523507919] [2022-03-19 09:21:55,575 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:21:55,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:21:55,576 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:21:55,577 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) [2022-03-19 09:21:55,577 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 09:21:55,621 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:21:55,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:21:55,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-19 09:21:55,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:21:58,274 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:21:58,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:01,027 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:01,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598485838] [2022-03-19 09:22:01,027 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:01,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523507919] [2022-03-19 09:22:01,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523507919] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:01,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:01,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-19 09:22:01,028 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:01,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1060719547] [2022-03-19 09:22:01,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1060719547] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:01,028 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:01,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:22:01,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365582498] [2022-03-19 09:22:01,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:01,028 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:22:01,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:01,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:22:01,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:22:01,029 INFO L87 Difference]: Start difference. First operand 150 states and 163 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:03,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:03,412 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2022-03-19 09:22:03,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:22:03,413 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:03,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:03,414 INFO L225 Difference]: With dead ends: 161 [2022-03-19 09:22:03,414 INFO L226 Difference]: Without dead ends: 159 [2022-03-19 09:22:03,414 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:22:03,414 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:03,414 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 322 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-03-19 09:22:03,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-03-19 09:22:03,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 141. [2022-03-19 09:22:03,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 108 states have internal predecessors, (114), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (19), 16 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-19 09:22:03,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 153 transitions. [2022-03-19 09:22:03,446 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 153 transitions. Word has length 59 [2022-03-19 09:22:03,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:03,447 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 153 transitions. [2022-03-19 09:22:03,447 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:03,447 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 153 transitions. [2022-03-19 09:22:03,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:22:03,447 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:03,447 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:03,464 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-19 09:22:03,664 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-19 09:22:03,664 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:03,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:03,665 INFO L85 PathProgramCache]: Analyzing trace with hash -1434400107, now seen corresponding path program 23 times [2022-03-19 09:22:03,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:03,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [753661242] [2022-03-19 09:22:03,665 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:03,665 INFO L85 PathProgramCache]: Analyzing trace with hash -1434400107, now seen corresponding path program 24 times [2022-03-19 09:22:03,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:03,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112482222] [2022-03-19 09:22:03,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:03,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:03,669 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:03,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [989165561] [2022-03-19 09:22:03,670 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:22:03,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:03,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:03,671 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:03,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 09:22:03,727 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-19 09:22:03,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:03,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-19 09:22:03,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:22:06,533 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:22:10,010 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:22:12,859 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-19 09:22:12,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:16,299 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-19 09:22:16,299 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:16,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112482222] [2022-03-19 09:22:16,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:16,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989165561] [2022-03-19 09:22:16,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989165561] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:16,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:16,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 10] total 28 [2022-03-19 09:22:16,300 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:16,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [753661242] [2022-03-19 09:22:16,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [753661242] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:16,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:16,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 09:22:16,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715327886] [2022-03-19 09:22:16,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:16,300 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 09:22:16,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:16,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 09:22:16,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=669, Unknown=0, NotChecked=0, Total=756 [2022-03-19 09:22:16,301 INFO L87 Difference]: Start difference. First operand 141 states and 153 transitions. Second operand has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:23,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:23,919 INFO L93 Difference]: Finished difference Result 166 states and 183 transitions. [2022-03-19 09:22:23,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 09:22:23,920 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:23,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:23,921 INFO L225 Difference]: With dead ends: 166 [2022-03-19 09:22:23,921 INFO L226 Difference]: Without dead ends: 155 [2022-03-19 09:22:23,921 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 88 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 09:22:23,922 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 19 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:23,922 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 377 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 617 Invalid, 0 Unknown, 18 Unchecked, 5.1s Time] [2022-03-19 09:22:23,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-03-19 09:22:23,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 146. [2022-03-19 09:22:23,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 109 states have (on average 1.091743119266055) internal successors, (119), 112 states have internal predecessors, (119), 21 states have call successors, (21), 16 states have call predecessors, (21), 15 states have return successors, (20), 17 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-19 09:22:23,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 160 transitions. [2022-03-19 09:22:23,971 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 160 transitions. Word has length 59 [2022-03-19 09:22:23,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:23,971 INFO L478 AbstractCegarLoop]: Abstraction has 146 states and 160 transitions. [2022-03-19 09:22:23,971 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:23,971 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 160 transitions. [2022-03-19 09:22:23,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:22:23,971 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:23,971 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:23,991 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 09:22:24,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-19 09:22:24,191 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:24,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:24,192 INFO L85 PathProgramCache]: Analyzing trace with hash 340607255, now seen corresponding path program 25 times [2022-03-19 09:22:24,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:24,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2061750002] [2022-03-19 09:22:24,192 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:24,192 INFO L85 PathProgramCache]: Analyzing trace with hash 340607255, now seen corresponding path program 26 times [2022-03-19 09:22:24,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:24,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740194649] [2022-03-19 09:22:24,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:24,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:24,196 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:24,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567731743] [2022-03-19 09:22:24,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:22:24,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:24,197 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:24,198 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:24,202 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 09:22:24,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:22:24,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:24,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-19 09:22:24,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:22:26,986 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:26,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:30,561 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:30,561 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:30,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740194649] [2022-03-19 09:22:30,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:30,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567731743] [2022-03-19 09:22:30,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567731743] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:30,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:30,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2022-03-19 09:22:30,561 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:30,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2061750002] [2022-03-19 09:22:30,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2061750002] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:30,562 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:30,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 09:22:30,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114258455] [2022-03-19 09:22:30,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:30,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 09:22:30,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:30,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 09:22:30,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:22:30,563 INFO L87 Difference]: Start difference. First operand 146 states and 160 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:33,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:33,087 INFO L93 Difference]: Finished difference Result 157 states and 172 transitions. [2022-03-19 09:22:33,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:22:33,088 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:33,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:33,089 INFO L225 Difference]: With dead ends: 157 [2022-03-19 09:22:33,089 INFO L226 Difference]: Without dead ends: 155 [2022-03-19 09:22:33,089 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2022-03-19 09:22:33,090 INFO L912 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:33,090 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 326 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-03-19 09:22:33,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-03-19 09:22:33,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 153. [2022-03-19 09:22:33,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 114 states have (on average 1.087719298245614) internal successors, (124), 118 states have internal predecessors, (124), 22 states have call successors, (22), 17 states have call predecessors, (22), 16 states have return successors, (21), 17 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 09:22:33,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 167 transitions. [2022-03-19 09:22:33,125 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 167 transitions. Word has length 59 [2022-03-19 09:22:33,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:33,126 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 167 transitions. [2022-03-19 09:22:33,126 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:33,126 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 167 transitions. [2022-03-19 09:22:33,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:22:33,126 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:33,126 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:33,130 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-19 09:22:33,329 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-19 09:22:33,329 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:33,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:33,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1502224219, now seen corresponding path program 27 times [2022-03-19 09:22:33,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:33,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1634447642] [2022-03-19 09:22:33,330 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:33,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1502224219, now seen corresponding path program 28 times [2022-03-19 09:22:33,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:33,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505541702] [2022-03-19 09:22:33,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:33,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:33,334 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:33,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2130938161] [2022-03-19 09:22:33,335 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:22:33,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:33,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:33,336 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:33,340 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 09:22:33,396 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:22:33,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:33,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-19 09:22:33,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:22:36,214 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:36,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:39,542 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 29 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:39,542 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:39,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505541702] [2022-03-19 09:22:39,542 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:39,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130938161] [2022-03-19 09:22:39,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130938161] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:39,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:39,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 25 [2022-03-19 09:22:39,543 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:39,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1634447642] [2022-03-19 09:22:39,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1634447642] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:39,543 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:39,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 09:22:39,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060686766] [2022-03-19 09:22:39,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:39,543 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 09:22:39,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:39,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 09:22:39,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2022-03-19 09:22:39,544 INFO L87 Difference]: Start difference. First operand 153 states and 167 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:42,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:42,101 INFO L93 Difference]: Finished difference Result 178 states and 196 transitions. [2022-03-19 09:22:42,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:22:42,102 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:42,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:42,103 INFO L225 Difference]: With dead ends: 178 [2022-03-19 09:22:42,103 INFO L226 Difference]: Without dead ends: 167 [2022-03-19 09:22:42,104 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=136, Invalid=566, Unknown=0, NotChecked=0, Total=702 [2022-03-19 09:22:42,104 INFO L912 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:42,104 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 350 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-03-19 09:22:42,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-03-19 09:22:42,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 165. [2022-03-19 09:22:42,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 123 states have (on average 1.08130081300813) internal successors, (133), 128 states have internal predecessors, (133), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 18 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-19 09:22:42,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 180 transitions. [2022-03-19 09:22:42,144 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 180 transitions. Word has length 59 [2022-03-19 09:22:42,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:42,144 INFO L478 AbstractCegarLoop]: Abstraction has 165 states and 180 transitions. [2022-03-19 09:22:42,144 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:42,144 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 180 transitions. [2022-03-19 09:22:42,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:22:42,145 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:42,145 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:42,151 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-19 09:22:42,349 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:42,349 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:42,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:42,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1293851497, now seen corresponding path program 29 times [2022-03-19 09:22:42,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:42,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [746837788] [2022-03-19 09:22:42,350 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:42,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1293851497, now seen corresponding path program 30 times [2022-03-19 09:22:42,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:42,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981815365] [2022-03-19 09:22:42,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:42,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:42,354 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:42,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1839481716] [2022-03-19 09:22:42,354 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:22:42,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:42,355 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:42,356 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:42,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 09:22:42,418 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-19 09:22:42,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:42,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-19 09:22:42,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:22:44,765 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:44,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:47,649 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:47,649 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:47,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981815365] [2022-03-19 09:22:47,649 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:47,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839481716] [2022-03-19 09:22:47,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839481716] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:47,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:47,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-19 09:22:47,650 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:47,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [746837788] [2022-03-19 09:22:47,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [746837788] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:47,650 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:47,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 09:22:47,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926970259] [2022-03-19 09:22:47,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:47,650 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 09:22:47,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:47,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 09:22:47,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-19 09:22:47,651 INFO L87 Difference]: Start difference. First operand 165 states and 180 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:50,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:50,075 INFO L93 Difference]: Finished difference Result 187 states and 206 transitions. [2022-03-19 09:22:50,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:22:50,076 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:50,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:50,077 INFO L225 Difference]: With dead ends: 187 [2022-03-19 09:22:50,077 INFO L226 Difference]: Without dead ends: 176 [2022-03-19 09:22:50,077 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:22:50,078 INFO L912 BasicCegarLoop]: 32 mSDtfsCounter, 8 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:50,078 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 326 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-03-19 09:22:50,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-19 09:22:50,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 167. [2022-03-19 09:22:50,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 125 states have (on average 1.088) internal successors, (136), 129 states have internal predecessors, (136), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-19 09:22:50,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 183 transitions. [2022-03-19 09:22:50,120 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 183 transitions. Word has length 59 [2022-03-19 09:22:50,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:50,120 INFO L478 AbstractCegarLoop]: Abstraction has 167 states and 183 transitions. [2022-03-19 09:22:50,121 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:50,121 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 183 transitions. [2022-03-19 09:22:50,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:22:50,121 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:50,121 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:50,145 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-19 09:22:50,347 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-19 09:22:50,347 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:50,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:50,348 INFO L85 PathProgramCache]: Analyzing trace with hash 481155865, now seen corresponding path program 7 times [2022-03-19 09:22:50,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:50,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1377854945] [2022-03-19 09:22:50,348 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:50,348 INFO L85 PathProgramCache]: Analyzing trace with hash 481155865, now seen corresponding path program 8 times [2022-03-19 09:22:50,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:50,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464521843] [2022-03-19 09:22:50,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:50,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:50,356 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:50,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2044930309] [2022-03-19 09:22:50,356 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:22:50,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:50,357 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:50,358 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:50,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 09:22:50,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:22:50,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:50,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-19 09:22:50,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:22:52,791 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:52,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:22:55,883 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:22:55,883 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:22:55,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464521843] [2022-03-19 09:22:55,883 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:22:55,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044930309] [2022-03-19 09:22:55,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044930309] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:22:55,883 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:22:55,883 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2022-03-19 09:22:55,883 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:22:55,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1377854945] [2022-03-19 09:22:55,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1377854945] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:22:55,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:22:55,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 09:22:55,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061266919] [2022-03-19 09:22:55,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:22:55,884 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 09:22:55,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:55,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 09:22:55,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:22:55,885 INFO L87 Difference]: Start difference. First operand 167 states and 183 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:58,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:22:58,546 INFO L93 Difference]: Finished difference Result 178 states and 195 transitions. [2022-03-19 09:22:58,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 09:22:58,546 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-19 09:22:58,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:22:58,547 INFO L225 Difference]: With dead ends: 178 [2022-03-19 09:22:58,547 INFO L226 Difference]: Without dead ends: 176 [2022-03-19 09:22:58,547 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=127, Invalid=629, Unknown=0, NotChecked=0, Total=756 [2022-03-19 09:22:58,548 INFO L912 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-19 09:22:58,548 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 350 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-03-19 09:22:58,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-19 09:22:58,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 167. [2022-03-19 09:22:58,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 125 states have (on average 1.088) internal successors, (136), 129 states have internal predecessors, (136), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-19 09:22:58,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 183 transitions. [2022-03-19 09:22:58,593 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 183 transitions. Word has length 59 [2022-03-19 09:22:58,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:22:58,593 INFO L478 AbstractCegarLoop]: Abstraction has 167 states and 183 transitions. [2022-03-19 09:22:58,594 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-19 09:22:58,594 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 183 transitions. [2022-03-19 09:22:58,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-19 09:22:58,594 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:22:58,594 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:22:58,611 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-19 09:22:58,798 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:58,799 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:22:58,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:22:58,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1744740017, now seen corresponding path program 9 times [2022-03-19 09:22:58,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:22:58,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [527237794] [2022-03-19 09:22:58,799 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:22:58,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1744740017, now seen corresponding path program 10 times [2022-03-19 09:22:58,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:22:58,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648076284] [2022-03-19 09:22:58,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:22:58,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:22:58,803 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:22:58,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [276680618] [2022-03-19 09:22:58,803 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:22:58,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:22:58,804 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:22:58,805 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:22:58,806 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 09:22:58,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:22:58,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:22:58,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 58 conjunts are in the unsatisfiable core [2022-03-19 09:22:58,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:23:02,780 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-19 09:23:02,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:23:05,100 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-03-19 09:23:05,100 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:23:05,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648076284] [2022-03-19 09:23:05,100 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:23:05,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276680618] [2022-03-19 09:23:05,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276680618] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:23:05,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:23:05,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 26 [2022-03-19 09:23:05,101 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:23:05,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [527237794] [2022-03-19 09:23:05,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [527237794] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:23:05,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:23:05,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 09:23:05,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219061284] [2022-03-19 09:23:05,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:23:05,101 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 09:23:05,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:05,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 09:23:05,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2022-03-19 09:23:05,102 INFO L87 Difference]: Start difference. First operand 167 states and 183 transitions. Second operand has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:09,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:23:09,729 INFO L93 Difference]: Finished difference Result 192 states and 212 transitions. [2022-03-19 09:23:09,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-19 09:23:09,730 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-19 09:23:09,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:23:09,731 INFO L225 Difference]: With dead ends: 192 [2022-03-19 09:23:09,731 INFO L226 Difference]: Without dead ends: 190 [2022-03-19 09:23:09,731 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 105 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2022-03-19 09:23:09,731 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:23:09,731 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 404 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-03-19 09:23:09,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-03-19 09:23:09,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 188. [2022-03-19 09:23:09,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 141 states have (on average 1.0921985815602837) internal successors, (154), 146 states have internal predecessors, (154), 27 states have call successors, (27), 20 states have call predecessors, (27), 19 states have return successors, (26), 21 states have call predecessors, (26), 26 states have call successors, (26) [2022-03-19 09:23:09,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 207 transitions. [2022-03-19 09:23:09,780 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 207 transitions. Word has length 68 [2022-03-19 09:23:09,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:23:09,780 INFO L478 AbstractCegarLoop]: Abstraction has 188 states and 207 transitions. [2022-03-19 09:23:09,780 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:09,780 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 207 transitions. [2022-03-19 09:23:09,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-19 09:23:09,781 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:23:09,781 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:23:09,807 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-19 09:23:09,997 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:23:09,997 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:23:09,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:23:09,997 INFO L85 PathProgramCache]: Analyzing trace with hash -775219917, now seen corresponding path program 31 times [2022-03-19 09:23:09,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:09,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2039526999] [2022-03-19 09:23:09,998 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:23:09,998 INFO L85 PathProgramCache]: Analyzing trace with hash -775219917, now seen corresponding path program 32 times [2022-03-19 09:23:09,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:23:09,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753506497] [2022-03-19 09:23:09,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:23:09,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:23:10,002 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:23:10,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1552436060] [2022-03-19 09:23:10,003 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:23:10,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:23:10,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:23:10,004 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:23:10,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 09:23:10,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:23:10,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:23:10,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 75 conjunts are in the unsatisfiable core [2022-03-19 09:23:10,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:23:14,799 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-03-19 09:23:14,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:23:17,423 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-19 09:23:17,423 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:23:17,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753506497] [2022-03-19 09:23:17,424 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:23:17,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552436060] [2022-03-19 09:23:17,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552436060] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:23:17,424 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:23:17,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12] total 30 [2022-03-19 09:23:17,424 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:23:17,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2039526999] [2022-03-19 09:23:17,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2039526999] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:23:17,424 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:23:17,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 09:23:17,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908840233] [2022-03-19 09:23:17,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:23:17,425 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 09:23:17,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:17,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 09:23:17,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2022-03-19 09:23:17,425 INFO L87 Difference]: Start difference. First operand 188 states and 207 transitions. Second operand has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:22,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:23:22,075 INFO L93 Difference]: Finished difference Result 203 states and 221 transitions. [2022-03-19 09:23:22,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 09:23:22,076 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-19 09:23:22,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:23:22,077 INFO L225 Difference]: With dead ends: 203 [2022-03-19 09:23:22,077 INFO L226 Difference]: Without dead ends: 201 [2022-03-19 09:23:22,077 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 09:23:22,078 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 22 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-03-19 09:23:22,078 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 388 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-03-19 09:23:22,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-03-19 09:23:22,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 176. [2022-03-19 09:23:22,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 132 states have (on average 1.0909090909090908) internal successors, (144), 136 states have internal predecessors, (144), 25 states have call successors, (25), 19 states have call predecessors, (25), 18 states have return successors, (24), 20 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-19 09:23:22,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 193 transitions. [2022-03-19 09:23:22,132 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 193 transitions. Word has length 68 [2022-03-19 09:23:22,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:23:22,132 INFO L478 AbstractCegarLoop]: Abstraction has 176 states and 193 transitions. [2022-03-19 09:23:22,132 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:22,132 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 193 transitions. [2022-03-19 09:23:22,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-19 09:23:22,133 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:23:22,133 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:23:22,149 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 09:23:22,339 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-03-19 09:23:22,340 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:23:22,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:23:22,340 INFO L85 PathProgramCache]: Analyzing trace with hash 723671663, now seen corresponding path program 33 times [2022-03-19 09:23:22,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:22,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [687460779] [2022-03-19 09:23:22,340 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:23:22,340 INFO L85 PathProgramCache]: Analyzing trace with hash 723671663, now seen corresponding path program 34 times [2022-03-19 09:23:22,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:23:22,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068277865] [2022-03-19 09:23:22,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:23:22,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:23:22,345 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:23:22,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1336752795] [2022-03-19 09:23:22,345 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 09:23:22,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:23:22,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:23:22,346 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:23:22,374 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 09:23:22,389 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 09:23:22,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:23:22,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-19 09:23:22,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:23:25,812 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:23:26,724 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-03-19 09:23:26,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:23:29,025 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-19 09:23:29,025 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:23:29,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068277865] [2022-03-19 09:23:29,025 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:23:29,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336752795] [2022-03-19 09:23:29,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336752795] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:23:29,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:23:29,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 25 [2022-03-19 09:23:29,026 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:23:29,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [687460779] [2022-03-19 09:23:29,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [687460779] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:23:29,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:23:29,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 09:23:29,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348527512] [2022-03-19 09:23:29,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:23:29,026 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 09:23:29,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:29,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 09:23:29,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2022-03-19 09:23:29,027 INFO L87 Difference]: Start difference. First operand 176 states and 193 transitions. Second operand has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:31,252 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 [] [2022-03-19 09:23:34,564 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 [] [2022-03-19 09:23:37,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:23:37,714 INFO L93 Difference]: Finished difference Result 196 states and 214 transitions. [2022-03-19 09:23:37,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 09:23:37,715 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-19 09:23:37,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:23:37,716 INFO L225 Difference]: With dead ends: 196 [2022-03-19 09:23:37,716 INFO L226 Difference]: Without dead ends: 194 [2022-03-19 09:23:37,717 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 107 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-03-19 09:23:37,717 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2022-03-19 09:23:37,717 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 379 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 649 Invalid, 2 Unknown, 0 Unchecked, 7.6s Time] [2022-03-19 09:23:37,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-03-19 09:23:37,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 183. [2022-03-19 09:23:37,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 137 states have (on average 1.0875912408759123) internal successors, (149), 142 states have internal predecessors, (149), 26 states have call successors, (26), 20 states have call predecessors, (26), 19 states have return successors, (25), 20 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-19 09:23:37,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 200 transitions. [2022-03-19 09:23:37,765 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 200 transitions. Word has length 68 [2022-03-19 09:23:37,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:23:37,765 INFO L478 AbstractCegarLoop]: Abstraction has 183 states and 200 transitions. [2022-03-19 09:23:37,765 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-19 09:23:37,765 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 200 transitions. [2022-03-19 09:23:37,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-19 09:23:37,765 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:23:37,765 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:23:37,784 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-19 09:23:37,981 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-19 09:23:37,982 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:23:37,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:23:37,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1885288627, now seen corresponding path program 35 times [2022-03-19 09:23:37,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:37,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1939972446] [2022-03-19 09:23:37,982 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:23:37,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1885288627, now seen corresponding path program 36 times [2022-03-19 09:23:37,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:23:37,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986585801] [2022-03-19 09:23:37,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:23:37,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:23:37,986 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:23:37,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [521227587] [2022-03-19 09:23:37,987 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 09:23:37,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:23:37,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:23:37,988 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 09:23:37,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-19 09:23:38,033 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-19 09:23:38,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:23:38,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 09:23:38,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:23:38,480 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:23:38,481 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:23:38,484 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:23:42,118 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-19 09:23:42,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:23:42,941 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-19 09:23:42,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:23:42,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986585801] [2022-03-19 09:23:42,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:23:42,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521227587] [2022-03-19 09:23:42,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521227587] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:23:42,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:23:42,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2022-03-19 09:23:42,942 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:23:42,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1939972446] [2022-03-19 09:23:42,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1939972446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:23:42,942 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:23:42,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 09:23:42,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339154299] [2022-03-19 09:23:42,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:23:42,942 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 09:23:42,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:23:42,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 09:23:42,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=126, Unknown=1, NotChecked=0, Total=156 [2022-03-19 09:23:42,943 INFO L87 Difference]: Start difference. First operand 183 states and 200 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-19 09:24:14,971 WARN L232 SmtUtils]: Spent 31.72s on a formula simplification. DAG size of input: 69 DAG size of output: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-19 09:24:15,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:24:15,392 INFO L93 Difference]: Finished difference Result 183 states and 200 transitions. [2022-03-19 09:24:15,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 09:24:15,393 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2022-03-19 09:24:15,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:24:15,393 INFO L225 Difference]: With dead ends: 183 [2022-03-19 09:24:15,393 INFO L226 Difference]: Without dead ends: 0 [2022-03-19 09:24:15,396 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 121 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=43, Invalid=166, Unknown=1, NotChecked=0, Total=210 [2022-03-19 09:24:15,399 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 8 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 09:24:15,399 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 134 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 12 Unchecked, 0.4s Time] [2022-03-19 09:24:15,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-19 09:24:15,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-19 09:24:15,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-19 09:24:15,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-19 09:24:15,400 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2022-03-19 09:24:15,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:24:15,400 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-19 09:24:15,400 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-19 09:24:15,400 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-19 09:24:15,400 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-19 09:24:15,402 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-19 09:24:15,418 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-19 09:24:15,615 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-19 09:24:15,617 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-19 09:29:01,448 WARN L232 SmtUtils]: Spent 4.75m on a formula simplification. DAG size of input: 427 DAG size of output: 390 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2022-03-19 09:29:43,738 WARN L232 SmtUtils]: Spent 29.06s on a formula simplification. DAG size of input: 322 DAG size of output: 33 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-19 09:31:44,745 WARN L232 SmtUtils]: Spent 2.01m on a formula simplification. DAG size of input: 357 DAG size of output: 49 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-19 09:32:24,070 WARN L232 SmtUtils]: Spent 38.98s on a formula simplification. DAG size of input: 320 DAG size of output: 30 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter)