/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/egcd3-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 20:55:37,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 20:55:37,426 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 20:55:37,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 20:55:37,496 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 20:55:37,496 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 20:55:37,498 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 20:55:37,499 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 20:55:37,508 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 20:55:37,508 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 20:55:37,510 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 20:55:37,510 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 20:55:37,511 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 20:55:37,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:55:37,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 20:55:37,512 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 20:55:37,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 20:55:37,723 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 20:55:37,725 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 20:55:37,725 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 20:55:37,726 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 20:55:37,726 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/egcd3-ll_unwindbound10.c [2022-03-20 20:55:37,767 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/885607788/a4ee94973ad44ef6b3a1198d1844abc1/FLAGced7c9cdb [2022-03-20 20:55:38,135 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 20:55:38,135 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd3-ll_unwindbound10.c [2022-03-20 20:55:38,141 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/885607788/a4ee94973ad44ef6b3a1198d1844abc1/FLAGced7c9cdb [2022-03-20 20:55:38,154 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/885607788/a4ee94973ad44ef6b3a1198d1844abc1 [2022-03-20 20:55:38,157 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 20:55:38,158 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 20:55:38,159 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 20:55:38,159 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 20:55:38,161 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 20:55:38,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,163 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bd679a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38, skipping insertion in model container [2022-03-20 20:55:38,163 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,167 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 20:55:38,179 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 20:55:38,303 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/egcd3-ll_unwindbound10.c[490,503] [2022-03-20 20:55:38,327 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:55:38,335 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 20:55:38,342 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/egcd3-ll_unwindbound10.c[490,503] [2022-03-20 20:55:38,360 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:55:38,370 INFO L208 MainTranslator]: Completed translation [2022-03-20 20:55:38,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38 WrapperNode [2022-03-20 20:55:38,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 20:55:38,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 20:55:38,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 20:55:38,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 20:55:38,378 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,378 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,383 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,394 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,398 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,403 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,406 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 20:55:38,407 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 20:55:38,407 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 20:55:38,407 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 20:55:38,407 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (1/1) ... [2022-03-20 20:55:38,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:55:38,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:38,427 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 20:55:38,436 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 20:55:38,456 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 20:55:38,459 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 20:55:38,459 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 20:55:38,459 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 20:55:38,459 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 20:55:38,460 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 20:55:38,460 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 20:55:38,460 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 20:55:38,460 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 20:55:38,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 20:55:38,460 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 20:55:38,461 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 20:55:38,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 20:55:38,461 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 20:55:38,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 20:55:38,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 20:55:38,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 20:55:38,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 20:55:38,462 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 20:55:38,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 20:55:38,504 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 20:55:38,505 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 20:55:38,600 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 20:55:38,604 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 20:55:38,604 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-20 20:55:38,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:55:38 BoogieIcfgContainer [2022-03-20 20:55:38,605 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 20:55:38,606 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 20:55:38,606 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 20:55:38,610 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 20:55:38,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 08:55:38" (1/3) ... [2022-03-20 20:55:38,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25b11329 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:55:38, skipping insertion in model container [2022-03-20 20:55:38,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:55:38" (2/3) ... [2022-03-20 20:55:38,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25b11329 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:55:38, skipping insertion in model container [2022-03-20 20:55:38,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:55:38" (3/3) ... [2022-03-20 20:55:38,612 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound10.c [2022-03-20 20:55:38,615 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 20:55:38,615 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 20:55:38,640 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 20:55:38,648 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 20:55:38,648 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 20:55:38,656 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 25 states have (on average 1.48) internal successors, (37), 26 states have internal predecessors, (37), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 20:55:38,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 20:55:38,661 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:38,661 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:38,661 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:38,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:38,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1766263304, now seen corresponding path program 1 times [2022-03-20 20:55:38,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:38,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [843225932] [2022-03-20 20:55:38,676 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:38,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1766263304, now seen corresponding path program 2 times [2022-03-20 20:55:38,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:38,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366891694] [2022-03-20 20:55:38,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:38,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:38,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:55:38,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 20:55:38,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:55:38,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 20:55:38,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:55:38,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 20:55:38,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:55:38,824 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:38,824 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:38,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366891694] [2022-03-20 20:55:38,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366891694] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:38,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:38,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:55:38,827 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:38,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [843225932] [2022-03-20 20:55:38,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [843225932] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:38,827 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:38,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:55:38,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932433291] [2022-03-20 20:55:38,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:38,830 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 20:55:38,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:38,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 20:55:38,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 20:55:38,853 INFO L87 Difference]: Start difference. First operand has 40 states, 25 states have (on average 1.48) internal successors, (37), 26 states have internal predecessors, (37), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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) [2022-03-20 20:55:38,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:38,960 INFO L93 Difference]: Finished difference Result 74 states and 111 transitions. [2022-03-20 20:55:38,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 20:55:38,962 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 22 [2022-03-20 20:55:38,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:38,967 INFO L225 Difference]: With dead ends: 74 [2022-03-20 20:55:38,967 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 20:55:38,969 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 20:55:38,971 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:38,971 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 51 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:38,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 20:55:38,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-03-20 20:55:38,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 20:55:38,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2022-03-20 20:55:39,000 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 22 [2022-03-20 20:55:39,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:39,000 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2022-03-20 20:55:39,000 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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) [2022-03-20 20:55:39,000 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2022-03-20 20:55:39,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 20:55:39,001 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:39,001 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:39,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 20:55:39,002 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:39,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:39,002 INFO L85 PathProgramCache]: Analyzing trace with hash -81203399, now seen corresponding path program 1 times [2022-03-20 20:55:39,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:39,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [461551927] [2022-03-20 20:55:39,003 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:39,003 INFO L85 PathProgramCache]: Analyzing trace with hash -81203399, now seen corresponding path program 2 times [2022-03-20 20:55:39,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:39,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165175366] [2022-03-20 20:55:39,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:39,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:39,017 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:39,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [751118217] [2022-03-20 20:55:39,018 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:39,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:39,018 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:39,022 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:39,023 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 20:55:39,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 20:55:39,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:39,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 20:55:39,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:39,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:39,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:39,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:39,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165175366] [2022-03-20 20:55:39,158 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:39,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751118217] [2022-03-20 20:55:39,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751118217] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:39,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:39,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 20:55:39,161 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:39,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [461551927] [2022-03-20 20:55:39,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [461551927] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:39,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:39,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 20:55:39,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406016532] [2022-03-20 20:55:39,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:39,162 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 20:55:39,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:39,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 20:55:39,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 20:55:39,163 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:39,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:39,199 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2022-03-20 20:55:39,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 20:55:39,200 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-20 20:55:39,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:39,200 INFO L225 Difference]: With dead ends: 44 [2022-03-20 20:55:39,201 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 20:55:39,201 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 20:55:39,202 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:39,202 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 113 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:39,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 20:55:39,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 20:55:39,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 25 states have internal predecessors, (31), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 20:55:39,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2022-03-20 20:55:39,214 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 23 [2022-03-20 20:55:39,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:39,215 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2022-03-20 20:55:39,215 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:39,215 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2022-03-20 20:55:39,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 20:55:39,215 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:39,215 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:39,234 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:39,416 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:39,416 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:39,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:39,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1762644405, now seen corresponding path program 1 times [2022-03-20 20:55:39,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:39,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1995897472] [2022-03-20 20:55:39,419 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:39,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1762644405, now seen corresponding path program 2 times [2022-03-20 20:55:39,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:39,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435033650] [2022-03-20 20:55:39,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:39,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:39,430 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:39,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [574290117] [2022-03-20 20:55:39,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:39,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:39,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:39,432 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:39,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 20:55:39,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 20:55:39,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:39,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 20:55:39,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:39,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:39,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:39,628 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:39,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435033650] [2022-03-20 20:55:39,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:39,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574290117] [2022-03-20 20:55:39,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574290117] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:39,628 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:39,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 20:55:39,629 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:39,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1995897472] [2022-03-20 20:55:39,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1995897472] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:39,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:39,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 20:55:39,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994656701] [2022-03-20 20:55:39,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:39,630 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 20:55:39,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:39,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 20:55:39,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:39,630 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-03-20 20:55:39,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:39,708 INFO L93 Difference]: Finished difference Result 57 states and 75 transitions. [2022-03-20 20:55:39,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 20:55:39,709 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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 24 [2022-03-20 20:55:39,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:39,712 INFO L225 Difference]: With dead ends: 57 [2022-03-20 20:55:39,712 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 20:55:39,714 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 20:55:39,720 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 18 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:39,720 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 192 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:39,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 20:55:39,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2022-03-20 20:55:39,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 36 states have internal predecessors, (46), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 20:55:39,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 70 transitions. [2022-03-20 20:55:39,729 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 70 transitions. Word has length 24 [2022-03-20 20:55:39,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:39,729 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 70 transitions. [2022-03-20 20:55:39,729 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-03-20 20:55:39,729 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 70 transitions. [2022-03-20 20:55:39,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 20:55:39,730 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:39,730 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:39,748 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:39,935 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 20:55:39,935 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:39,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:39,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1090347867, now seen corresponding path program 1 times [2022-03-20 20:55:39,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:39,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [626534245] [2022-03-20 20:55:39,937 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:39,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1090347867, now seen corresponding path program 2 times [2022-03-20 20:55:39,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:39,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220333144] [2022-03-20 20:55:39,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:39,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:39,956 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:39,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1649400690] [2022-03-20 20:55:39,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:39,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:39,957 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:39,961 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:39,962 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 20:55:40,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:40,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:40,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:55:40,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:40,058 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:40,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:40,058 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:40,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220333144] [2022-03-20 20:55:40,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:40,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649400690] [2022-03-20 20:55:40,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649400690] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:40,059 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:40,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:40,059 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:40,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [626534245] [2022-03-20 20:55:40,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [626534245] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:40,059 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:40,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:40,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475306277] [2022-03-20 20:55:40,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:40,060 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:40,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:40,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:40,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:40,060 INFO L87 Difference]: Start difference. First operand 53 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:40,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:40,079 INFO L93 Difference]: Finished difference Result 77 states and 104 transitions. [2022-03-20 20:55:40,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:55:40,079 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-03-20 20:55:40,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:40,080 INFO L225 Difference]: With dead ends: 77 [2022-03-20 20:55:40,080 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 20:55:40,081 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:40,081 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:40,081 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:40,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 20:55:40,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 20:55:40,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 38 states have internal predecessors, (48), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 20:55:40,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2022-03-20 20:55:40,088 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 29 [2022-03-20 20:55:40,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:40,088 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2022-03-20 20:55:40,088 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:40,088 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2022-03-20 20:55:40,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 20:55:40,089 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:40,089 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:40,108 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-03-20 20:55:40,305 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:40,305 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:40,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:40,306 INFO L85 PathProgramCache]: Analyzing trace with hash 979890972, now seen corresponding path program 1 times [2022-03-20 20:55:40,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:40,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1196090085] [2022-03-20 20:55:40,306 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:40,306 INFO L85 PathProgramCache]: Analyzing trace with hash 979890972, now seen corresponding path program 2 times [2022-03-20 20:55:40,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:40,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106082346] [2022-03-20 20:55:40,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:40,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:40,319 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:40,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [778549749] [2022-03-20 20:55:40,319 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:40,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:40,319 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:40,320 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:40,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 20:55:40,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:40,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:40,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:55:40,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:40,429 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:40,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:40,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:40,520 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:40,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106082346] [2022-03-20 20:55:40,520 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:40,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778549749] [2022-03-20 20:55:40,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778549749] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:40,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:40,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-03-20 20:55:40,521 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:40,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1196090085] [2022-03-20 20:55:40,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1196090085] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:40,521 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:40,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 20:55:40,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485071079] [2022-03-20 20:55:40,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:40,521 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 20:55:40,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:40,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 20:55:40,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-03-20 20:55:40,522 INFO L87 Difference]: Start difference. First operand 55 states and 72 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:40,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:40,553 INFO L93 Difference]: Finished difference Result 67 states and 85 transitions. [2022-03-20 20:55:40,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 20:55:40,553 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2022-03-20 20:55:40,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:40,555 INFO L225 Difference]: With dead ends: 67 [2022-03-20 20:55:40,555 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 20:55:40,556 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2022-03-20 20:55:40,557 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 14 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:40,558 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 141 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:40,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 20:55:40,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2022-03-20 20:55:40,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 20:55:40,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 77 transitions. [2022-03-20 20:55:40,574 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 77 transitions. Word has length 30 [2022-03-20 20:55:40,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:40,575 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 77 transitions. [2022-03-20 20:55:40,575 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:40,575 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 77 transitions. [2022-03-20 20:55:40,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 20:55:40,577 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:40,577 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:40,593 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:40,793 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:40,793 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:40,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:40,794 INFO L85 PathProgramCache]: Analyzing trace with hash 296831538, now seen corresponding path program 1 times [2022-03-20 20:55:40,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:40,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [72864860] [2022-03-20 20:55:40,794 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:40,794 INFO L85 PathProgramCache]: Analyzing trace with hash 296831538, now seen corresponding path program 2 times [2022-03-20 20:55:40,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:40,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298273399] [2022-03-20 20:55:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:40,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:40,806 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:40,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [246244219] [2022-03-20 20:55:40,807 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:40,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:40,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:40,809 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:40,810 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 20:55:40,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:40,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:40,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:55:40,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:40,901 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 20:55:40,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:40,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 20:55:40,987 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:40,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298273399] [2022-03-20 20:55:40,991 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:40,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246244219] [2022-03-20 20:55:40,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246244219] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:40,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:40,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-03-20 20:55:40,992 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:40,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [72864860] [2022-03-20 20:55:40,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [72864860] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:40,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:40,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:55:40,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976048893] [2022-03-20 20:55:40,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:40,993 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:55:40,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:40,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:55:40,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-03-20 20:55:40,994 INFO L87 Difference]: Start difference. First operand 59 states and 77 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:41,135 INFO L93 Difference]: Finished difference Result 138 states and 201 transitions. [2022-03-20 20:55:41,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 20:55:41,135 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 2 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 31 [2022-03-20 20:55:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:41,136 INFO L225 Difference]: With dead ends: 138 [2022-03-20 20:55:41,136 INFO L226 Difference]: Without dead ends: 131 [2022-03-20 20:55:41,137 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2022-03-20 20:55:41,138 INFO L913 BasicCegarLoop]: 64 mSDtfsCounter, 115 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:41,139 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 353 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:41,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-20 20:55:41,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 88. [2022-03-20 20:55:41,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.3636363636363635) internal successors, (90), 67 states have internal predecessors, (90), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 20:55:41,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 122 transitions. [2022-03-20 20:55:41,164 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 122 transitions. Word has length 31 [2022-03-20 20:55:41,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:41,164 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 122 transitions. [2022-03-20 20:55:41,165 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:41,165 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 122 transitions. [2022-03-20 20:55:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 20:55:41,169 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:41,169 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:41,187 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-20 20:55:41,386 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:41,387 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:41,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:41,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1911367052, now seen corresponding path program 1 times [2022-03-20 20:55:41,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:41,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [121139469] [2022-03-20 20:55:41,387 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:41,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1911367052, now seen corresponding path program 2 times [2022-03-20 20:55:41,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:41,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123733897] [2022-03-20 20:55:41,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:41,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:41,398 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:41,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [459806701] [2022-03-20 20:55:41,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:41,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:41,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:41,400 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:41,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 20:55:41,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:41,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:41,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:55:41,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:41,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:41,498 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:41,498 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:41,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123733897] [2022-03-20 20:55:41,498 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:41,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459806701] [2022-03-20 20:55:41,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459806701] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:41,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:41,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 20:55:41,499 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:41,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [121139469] [2022-03-20 20:55:41,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [121139469] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:41,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:41,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 20:55:41,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788743159] [2022-03-20 20:55:41,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:41,500 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 20:55:41,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:41,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 20:55:41,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:41,500 INFO L87 Difference]: Start difference. First operand 88 states and 122 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:41,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:41,537 INFO L93 Difference]: Finished difference Result 127 states and 178 transitions. [2022-03-20 20:55:41,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 20:55:41,538 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2022-03-20 20:55:41,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:41,538 INFO L225 Difference]: With dead ends: 127 [2022-03-20 20:55:41,538 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 20:55:41,539 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:41,539 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 10 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:41,539 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 165 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:41,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 20:55:41,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-03-20 20:55:41,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 68 states have (on average 1.3529411764705883) internal successors, (92), 69 states have internal predecessors, (92), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 20:55:41,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 124 transitions. [2022-03-20 20:55:41,548 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 124 transitions. Word has length 35 [2022-03-20 20:55:41,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:41,548 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 124 transitions. [2022-03-20 20:55:41,548 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:41,548 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 124 transitions. [2022-03-20 20:55:41,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 20:55:41,549 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:41,549 INFO L499 BasicCegarLoop]: trace histogram [3, 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] [2022-03-20 20:55:41,569 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:41,767 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:41,767 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:41,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:41,768 INFO L85 PathProgramCache]: Analyzing trace with hash -304485816, now seen corresponding path program 1 times [2022-03-20 20:55:41,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:41,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1274184237] [2022-03-20 20:55:41,769 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:41,769 INFO L85 PathProgramCache]: Analyzing trace with hash -304485816, now seen corresponding path program 2 times [2022-03-20 20:55:41,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:41,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202194410] [2022-03-20 20:55:41,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:41,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:41,782 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:41,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1968597626] [2022-03-20 20:55:41,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:41,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:41,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:41,787 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:41,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 20:55:41,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:41,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:41,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 20:55:41,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:41,910 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:41,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:41,988 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:41,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:41,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202194410] [2022-03-20 20:55:41,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:41,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968597626] [2022-03-20 20:55:41,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968597626] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:41,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:41,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-20 20:55:41,989 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:41,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1274184237] [2022-03-20 20:55:41,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1274184237] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:41,989 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:41,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 20:55:41,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448463382] [2022-03-20 20:55:41,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:41,990 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 20:55:41,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:41,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 20:55:41,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-03-20 20:55:41,990 INFO L87 Difference]: Start difference. First operand 90 states and 124 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:42,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:42,031 INFO L93 Difference]: Finished difference Result 163 states and 227 transitions. [2022-03-20 20:55:42,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:55:42,032 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2022-03-20 20:55:42,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:42,033 INFO L225 Difference]: With dead ends: 163 [2022-03-20 20:55:42,033 INFO L226 Difference]: Without dead ends: 112 [2022-03-20 20:55:42,035 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-03-20 20:55:42,035 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 29 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:42,035 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 163 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:42,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-03-20 20:55:42,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 109. [2022-03-20 20:55:42,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 81 states have (on average 1.3209876543209877) internal successors, (107), 82 states have internal predecessors, (107), 21 states have call successors, (21), 7 states have call predecessors, (21), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 20:55:42,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 147 transitions. [2022-03-20 20:55:42,046 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 147 transitions. Word has length 36 [2022-03-20 20:55:42,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:42,047 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 147 transitions. [2022-03-20 20:55:42,047 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:42,047 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 147 transitions. [2022-03-20 20:55:42,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 20:55:42,048 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:42,048 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 20:55:42,065 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:42,263 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:42,264 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:42,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:42,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1581560821, now seen corresponding path program 1 times [2022-03-20 20:55:42,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:42,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [914008961] [2022-03-20 20:55:42,264 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:42,265 INFO L85 PathProgramCache]: Analyzing trace with hash 1581560821, now seen corresponding path program 2 times [2022-03-20 20:55:42,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:42,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712299905] [2022-03-20 20:55:42,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:42,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:42,275 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:42,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1375893571] [2022-03-20 20:55:42,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:42,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:42,276 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:42,277 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:42,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 20:55:42,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:42,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:42,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 20:55:42,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:42,468 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 20:55:42,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:42,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:42,556 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:42,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712299905] [2022-03-20 20:55:42,556 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:42,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375893571] [2022-03-20 20:55:42,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375893571] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:42,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:42,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 11 [2022-03-20 20:55:42,558 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:42,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [914008961] [2022-03-20 20:55:42,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [914008961] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:42,558 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:42,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 20:55:42,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957561978] [2022-03-20 20:55:42,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:42,560 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 20:55:42,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:42,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 20:55:42,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 20:55:42,561 INFO L87 Difference]: Start difference. First operand 109 states and 147 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:42,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:42,643 INFO L93 Difference]: Finished difference Result 154 states and 208 transitions. [2022-03-20 20:55:42,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 20:55:42,643 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (5), 2 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 36 [2022-03-20 20:55:42,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:42,644 INFO L225 Difference]: With dead ends: 154 [2022-03-20 20:55:42,644 INFO L226 Difference]: Without dead ends: 152 [2022-03-20 20:55:42,644 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-03-20 20:55:42,645 INFO L913 BasicCegarLoop]: 64 mSDtfsCounter, 61 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:42,645 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 375 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:42,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-03-20 20:55:42,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 148. [2022-03-20 20:55:42,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 109 states have (on average 1.3394495412844036) internal successors, (146), 110 states have internal predecessors, (146), 29 states have call successors, (29), 10 states have call predecessors, (29), 9 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-03-20 20:55:42,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 202 transitions. [2022-03-20 20:55:42,656 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 202 transitions. Word has length 36 [2022-03-20 20:55:42,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:42,656 INFO L478 AbstractCegarLoop]: Abstraction has 148 states and 202 transitions. [2022-03-20 20:55:42,656 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:42,656 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 202 transitions. [2022-03-20 20:55:42,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 20:55:42,656 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:42,656 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:42,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:42,871 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-20 20:55:42,872 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:42,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:42,872 INFO L85 PathProgramCache]: Analyzing trace with hash -428189223, now seen corresponding path program 3 times [2022-03-20 20:55:42,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:42,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [949715579] [2022-03-20 20:55:42,872 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:42,872 INFO L85 PathProgramCache]: Analyzing trace with hash -428189223, now seen corresponding path program 4 times [2022-03-20 20:55:42,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:42,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018137393] [2022-03-20 20:55:42,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:42,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:42,880 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:42,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1011488238] [2022-03-20 20:55:42,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:42,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:42,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:42,882 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:42,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 20:55:42,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:42,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:42,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 20:55:42,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:42,959 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:42,959 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:42,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:42,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018137393] [2022-03-20 20:55:42,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:42,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011488238] [2022-03-20 20:55:42,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011488238] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:42,960 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:42,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:42,960 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:42,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [949715579] [2022-03-20 20:55:42,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [949715579] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:42,960 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:42,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:42,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740662618] [2022-03-20 20:55:42,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:42,961 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:42,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:42,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:42,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:42,961 INFO L87 Difference]: Start difference. First operand 148 states and 202 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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) [2022-03-20 20:55:43,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:43,035 INFO L93 Difference]: Finished difference Result 300 states and 442 transitions. [2022-03-20 20:55:43,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 20:55:43,035 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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 37 [2022-03-20 20:55:43,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:43,037 INFO L225 Difference]: With dead ends: 300 [2022-03-20 20:55:43,037 INFO L226 Difference]: Without dead ends: 249 [2022-03-20 20:55:43,037 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-20 20:55:43,037 INFO L913 BasicCegarLoop]: 64 mSDtfsCounter, 29 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:43,038 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 202 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:43,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2022-03-20 20:55:43,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 175. [2022-03-20 20:55:43,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 136 states have (on average 1.3455882352941178) internal successors, (183), 137 states have internal predecessors, (183), 29 states have call successors, (29), 10 states have call predecessors, (29), 9 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-03-20 20:55:43,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 239 transitions. [2022-03-20 20:55:43,052 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 239 transitions. Word has length 37 [2022-03-20 20:55:43,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:43,052 INFO L478 AbstractCegarLoop]: Abstraction has 175 states and 239 transitions. [2022-03-20 20:55:43,052 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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) [2022-03-20 20:55:43,052 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 239 transitions. [2022-03-20 20:55:43,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 20:55:43,053 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:43,053 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:43,069 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:43,269 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 20:55:43,269 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:43,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:43,269 INFO L85 PathProgramCache]: Analyzing trace with hash -957710478, now seen corresponding path program 1 times [2022-03-20 20:55:43,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:43,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1959488524] [2022-03-20 20:55:43,270 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:43,270 INFO L85 PathProgramCache]: Analyzing trace with hash -957710478, now seen corresponding path program 2 times [2022-03-20 20:55:43,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:43,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689765771] [2022-03-20 20:55:43,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:43,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:43,277 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:43,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1279439343] [2022-03-20 20:55:43,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:43,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:43,278 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:43,278 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:43,283 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 20:55:43,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:43,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:43,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 20:55:43,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:43,416 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 20:55:43,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:43,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:43,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689765771] [2022-03-20 20:55:43,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:43,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279439343] [2022-03-20 20:55:43,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279439343] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:43,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:43,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 20:55:43,417 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:43,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1959488524] [2022-03-20 20:55:43,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1959488524] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:43,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:43,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 20:55:43,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805134183] [2022-03-20 20:55:43,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:43,418 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 20:55:43,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:43,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 20:55:43,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2022-03-20 20:55:43,419 INFO L87 Difference]: Start difference. First operand 175 states and 239 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:55:43,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:43,507 INFO L93 Difference]: Finished difference Result 193 states and 262 transitions. [2022-03-20 20:55:43,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 20:55:43,507 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2022-03-20 20:55:43,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:43,508 INFO L225 Difference]: With dead ends: 193 [2022-03-20 20:55:43,508 INFO L226 Difference]: Without dead ends: 191 [2022-03-20 20:55:43,509 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2022-03-20 20:55:43,509 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 61 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:43,509 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 270 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:43,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-03-20 20:55:43,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2022-03-20 20:55:43,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 145 states have (on average 1.3379310344827586) internal successors, (194), 146 states have internal predecessors, (194), 33 states have call successors, (33), 12 states have call predecessors, (33), 11 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-03-20 20:55:43,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 258 transitions. [2022-03-20 20:55:43,527 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 258 transitions. Word has length 39 [2022-03-20 20:55:43,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:43,527 INFO L478 AbstractCegarLoop]: Abstraction has 190 states and 258 transitions. [2022-03-20 20:55:43,527 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:55:43,527 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 258 transitions. [2022-03-20 20:55:43,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 20:55:43,528 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:43,528 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:43,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:43,741 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 20:55:43,741 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:43,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:43,742 INFO L85 PathProgramCache]: Analyzing trace with hash 409018142, now seen corresponding path program 1 times [2022-03-20 20:55:43,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:43,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1207800879] [2022-03-20 20:55:43,742 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:43,742 INFO L85 PathProgramCache]: Analyzing trace with hash 409018142, now seen corresponding path program 2 times [2022-03-20 20:55:43,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:43,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745811305] [2022-03-20 20:55:43,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:43,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:43,749 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:43,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1748094408] [2022-03-20 20:55:43,749 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:43,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:43,749 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:43,753 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:43,754 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 20:55:43,783 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:43,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:43,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 20:55:43,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:44,028 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:44,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:44,147 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:44,147 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:44,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745811305] [2022-03-20 20:55:44,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:44,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748094408] [2022-03-20 20:55:44,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748094408] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:44,148 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:44,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2022-03-20 20:55:44,148 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:44,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1207800879] [2022-03-20 20:55:44,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1207800879] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:44,148 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:44,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 20:55:44,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365587536] [2022-03-20 20:55:44,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:44,148 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 20:55:44,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:44,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 20:55:44,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:44,149 INFO L87 Difference]: Start difference. First operand 190 states and 258 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 20:55:44,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:44,301 INFO L93 Difference]: Finished difference Result 199 states and 266 transitions. [2022-03-20 20:55:44,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 20:55:44,302 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 41 [2022-03-20 20:55:44,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:44,303 INFO L225 Difference]: With dead ends: 199 [2022-03-20 20:55:44,303 INFO L226 Difference]: Without dead ends: 197 [2022-03-20 20:55:44,303 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2022-03-20 20:55:44,304 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 72 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:44,304 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 385 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:44,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-03-20 20:55:44,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2022-03-20 20:55:44,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 148 states have (on average 1.3310810810810811) internal successors, (197), 149 states have internal predecessors, (197), 33 states have call successors, (33), 13 states have call predecessors, (33), 12 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-03-20 20:55:44,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 261 transitions. [2022-03-20 20:55:44,319 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 261 transitions. Word has length 41 [2022-03-20 20:55:44,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:44,320 INFO L478 AbstractCegarLoop]: Abstraction has 194 states and 261 transitions. [2022-03-20 20:55:44,320 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-20 20:55:44,320 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 261 transitions. [2022-03-20 20:55:44,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 20:55:44,320 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:44,320 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:44,336 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:44,535 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 20:55:44,535 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:44,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:44,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1943393983, now seen corresponding path program 1 times [2022-03-20 20:55:44,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:44,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1834448965] [2022-03-20 20:55:44,536 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:44,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1943393983, now seen corresponding path program 2 times [2022-03-20 20:55:44,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:44,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934624962] [2022-03-20 20:55:44,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:44,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:44,543 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:44,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [323548628] [2022-03-20 20:55:44,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:44,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:44,543 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:44,549 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:44,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 20:55:44,577 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:44,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:44,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:55:44,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:44,636 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 20:55:44,636 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:44,636 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:44,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934624962] [2022-03-20 20:55:44,636 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:44,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323548628] [2022-03-20 20:55:44,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323548628] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:44,637 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:44,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:44,637 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:44,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1834448965] [2022-03-20 20:55:44,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1834448965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:44,637 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:44,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:44,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049673910] [2022-03-20 20:55:44,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:44,637 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:44,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:44,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:44,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:44,638 INFO L87 Difference]: Start difference. First operand 194 states and 261 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 20:55:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:44,680 INFO L93 Difference]: Finished difference Result 261 states and 367 transitions. [2022-03-20 20:55:44,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:55:44,680 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2022-03-20 20:55:44,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:44,682 INFO L225 Difference]: With dead ends: 261 [2022-03-20 20:55:44,682 INFO L226 Difference]: Without dead ends: 259 [2022-03-20 20:55:44,683 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:44,683 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 12 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:44,683 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 169 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:44,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-03-20 20:55:44,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 228. [2022-03-20 20:55:44,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 161 states have (on average 1.329192546583851) internal successors, (214), 167 states have internal predecessors, (214), 53 states have call successors, (53), 14 states have call predecessors, (53), 13 states have return successors, (51), 46 states have call predecessors, (51), 51 states have call successors, (51) [2022-03-20 20:55:44,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 318 transitions. [2022-03-20 20:55:44,705 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 318 transitions. Word has length 44 [2022-03-20 20:55:44,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:44,706 INFO L478 AbstractCegarLoop]: Abstraction has 228 states and 318 transitions. [2022-03-20 20:55:44,706 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 20:55:44,706 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 318 transitions. [2022-03-20 20:55:44,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 20:55:44,706 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:44,706 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:44,724 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:44,922 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 20:55:44,922 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:44,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:44,923 INFO L85 PathProgramCache]: Analyzing trace with hash -772903697, now seen corresponding path program 1 times [2022-03-20 20:55:44,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:44,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [850147089] [2022-03-20 20:55:44,923 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:44,923 INFO L85 PathProgramCache]: Analyzing trace with hash -772903697, now seen corresponding path program 2 times [2022-03-20 20:55:44,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:44,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681351309] [2022-03-20 20:55:44,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:44,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:44,929 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:44,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [175669605] [2022-03-20 20:55:44,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:44,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:44,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:44,933 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:44,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 20:55:44,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:44,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:44,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 20:55:44,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:45,046 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:45,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:45,152 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:55:45,152 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:45,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681351309] [2022-03-20 20:55:45,152 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:45,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175669605] [2022-03-20 20:55:45,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175669605] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:45,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:45,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-03-20 20:55:45,153 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:45,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [850147089] [2022-03-20 20:55:45,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [850147089] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:45,154 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:45,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:55:45,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458422965] [2022-03-20 20:55:45,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:45,154 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:55:45,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:45,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:55:45,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:45,155 INFO L87 Difference]: Start difference. First operand 228 states and 318 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:45,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:45,231 INFO L93 Difference]: Finished difference Result 429 states and 607 transitions. [2022-03-20 20:55:45,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 20:55:45,231 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2022-03-20 20:55:45,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:45,234 INFO L225 Difference]: With dead ends: 429 [2022-03-20 20:55:45,235 INFO L226 Difference]: Without dead ends: 264 [2022-03-20 20:55:45,235 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-03-20 20:55:45,235 INFO L913 BasicCegarLoop]: 51 mSDtfsCounter, 59 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:45,236 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 203 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:45,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-03-20 20:55:45,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 258. [2022-03-20 20:55:45,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 183 states have (on average 1.3060109289617485) internal successors, (239), 189 states have internal predecessors, (239), 57 states have call successors, (57), 18 states have call predecessors, (57), 17 states have return successors, (55), 50 states have call predecessors, (55), 55 states have call successors, (55) [2022-03-20 20:55:45,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 351 transitions. [2022-03-20 20:55:45,273 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 351 transitions. Word has length 42 [2022-03-20 20:55:45,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:45,274 INFO L478 AbstractCegarLoop]: Abstraction has 258 states and 351 transitions. [2022-03-20 20:55:45,274 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:55:45,274 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 351 transitions. [2022-03-20 20:55:45,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 20:55:45,274 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:45,274 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:45,292 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:45,479 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 20:55:45,479 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:45,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:45,480 INFO L85 PathProgramCache]: Analyzing trace with hash 744709461, now seen corresponding path program 1 times [2022-03-20 20:55:45,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:45,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1302628060] [2022-03-20 20:55:45,480 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:45,480 INFO L85 PathProgramCache]: Analyzing trace with hash 744709461, now seen corresponding path program 2 times [2022-03-20 20:55:45,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:45,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355785806] [2022-03-20 20:55:45,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:45,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:45,487 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:45,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [590333140] [2022-03-20 20:55:45,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:45,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:45,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:45,488 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:45,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 20:55:45,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:45,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:45,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:55:45,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:45,603 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 20:55:45,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:45,603 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:45,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355785806] [2022-03-20 20:55:45,604 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:45,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590333140] [2022-03-20 20:55:45,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590333140] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:45,604 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:45,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:45,604 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:45,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1302628060] [2022-03-20 20:55:45,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1302628060] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:45,604 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:45,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:45,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186115034] [2022-03-20 20:55:45,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:45,605 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:45,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:45,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:45,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:45,605 INFO L87 Difference]: Start difference. First operand 258 states and 351 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:55:45,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:45,655 INFO L93 Difference]: Finished difference Result 332 states and 473 transitions. [2022-03-20 20:55:45,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:55:45,655 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 46 [2022-03-20 20:55:45,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:45,657 INFO L225 Difference]: With dead ends: 332 [2022-03-20 20:55:45,657 INFO L226 Difference]: Without dead ends: 330 [2022-03-20 20:55:45,657 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:45,658 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 10 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:45,658 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 158 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:45,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2022-03-20 20:55:45,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 321. [2022-03-20 20:55:45,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 213 states have (on average 1.3427230046948357) internal successors, (286), 223 states have internal predecessors, (286), 89 states have call successors, (89), 19 states have call predecessors, (89), 18 states have return successors, (87), 78 states have call predecessors, (87), 87 states have call successors, (87) [2022-03-20 20:55:45,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 462 transitions. [2022-03-20 20:55:45,681 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 462 transitions. Word has length 46 [2022-03-20 20:55:45,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:45,681 INFO L478 AbstractCegarLoop]: Abstraction has 321 states and 462 transitions. [2022-03-20 20:55:45,681 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:55:45,681 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 462 transitions. [2022-03-20 20:55:45,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 20:55:45,681 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:45,681 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:45,699 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:45,894 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:45,894 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:45,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:45,895 INFO L85 PathProgramCache]: Analyzing trace with hash -522797827, now seen corresponding path program 1 times [2022-03-20 20:55:45,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:45,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1422197071] [2022-03-20 20:55:45,895 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:45,895 INFO L85 PathProgramCache]: Analyzing trace with hash -522797827, now seen corresponding path program 2 times [2022-03-20 20:55:45,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:45,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093335451] [2022-03-20 20:55:45,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:45,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:45,901 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:45,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [615368778] [2022-03-20 20:55:45,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:45,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:45,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:45,903 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:45,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 20:55:45,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:45,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:45,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 20:55:45,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:46,047 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:46,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:46,181 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:46,181 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:46,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093335451] [2022-03-20 20:55:46,181 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:46,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615368778] [2022-03-20 20:55:46,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615368778] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:46,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:46,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-03-20 20:55:46,182 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:46,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1422197071] [2022-03-20 20:55:46,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1422197071] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:46,182 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:46,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:55:46,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931858307] [2022-03-20 20:55:46,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:46,182 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:55:46,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:46,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:55:46,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:46,183 INFO L87 Difference]: Start difference. First operand 321 states and 462 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:46,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:46,258 INFO L93 Difference]: Finished difference Result 335 states and 475 transitions. [2022-03-20 20:55:46,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 20:55:46,258 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 57 [2022-03-20 20:55:46,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:46,260 INFO L225 Difference]: With dead ends: 335 [2022-03-20 20:55:46,260 INFO L226 Difference]: Without dead ends: 328 [2022-03-20 20:55:46,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2022-03-20 20:55:46,260 INFO L913 BasicCegarLoop]: 51 mSDtfsCounter, 53 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:46,261 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 186 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:46,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2022-03-20 20:55:46,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 324. [2022-03-20 20:55:46,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 216 states have (on average 1.337962962962963) internal successors, (289), 226 states have internal predecessors, (289), 89 states have call successors, (89), 19 states have call predecessors, (89), 18 states have return successors, (87), 78 states have call predecessors, (87), 87 states have call successors, (87) [2022-03-20 20:55:46,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 465 transitions. [2022-03-20 20:55:46,293 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 465 transitions. Word has length 57 [2022-03-20 20:55:46,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:46,293 INFO L478 AbstractCegarLoop]: Abstraction has 324 states and 465 transitions. [2022-03-20 20:55:46,293 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:46,293 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 465 transitions. [2022-03-20 20:55:46,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 20:55:46,294 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:46,294 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:46,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:46,507 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 20:55:46,507 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:46,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:46,508 INFO L85 PathProgramCache]: Analyzing trace with hash 958119025, now seen corresponding path program 1 times [2022-03-20 20:55:46,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:46,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1942126489] [2022-03-20 20:55:46,508 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:46,508 INFO L85 PathProgramCache]: Analyzing trace with hash 958119025, now seen corresponding path program 2 times [2022-03-20 20:55:46,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:46,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914470892] [2022-03-20 20:55:46,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:46,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:46,514 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:46,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1174836698] [2022-03-20 20:55:46,514 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:46,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:46,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:46,516 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:46,517 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 20:55:46,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:46,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:46,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-20 20:55:46,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:47,075 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 7 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-20 20:55:47,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 7 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-20 20:55:52,975 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:52,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914470892] [2022-03-20 20:55:52,975 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:52,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174836698] [2022-03-20 20:55:52,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174836698] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:52,975 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:52,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 21 [2022-03-20 20:55:52,976 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:52,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1942126489] [2022-03-20 20:55:52,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1942126489] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:52,976 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:52,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 20:55:52,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700584429] [2022-03-20 20:55:52,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:52,976 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 20:55:52,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:52,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 20:55:52,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2022-03-20 20:55:52,977 INFO L87 Difference]: Start difference. First operand 324 states and 465 transitions. Second operand has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:53,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:53,321 INFO L93 Difference]: Finished difference Result 384 states and 559 transitions. [2022-03-20 20:55:53,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 20:55:53,321 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 58 [2022-03-20 20:55:53,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:53,323 INFO L225 Difference]: With dead ends: 384 [2022-03-20 20:55:53,323 INFO L226 Difference]: Without dead ends: 381 [2022-03-20 20:55:53,323 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2022-03-20 20:55:53,324 INFO L913 BasicCegarLoop]: 57 mSDtfsCounter, 74 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:53,324 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 474 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 20:55:53,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2022-03-20 20:55:53,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 377. [2022-03-20 20:55:53,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 243 states have (on average 1.345679012345679) internal successors, (327), 256 states have internal predecessors, (327), 113 states have call successors, (113), 21 states have call predecessors, (113), 20 states have return successors, (111), 99 states have call predecessors, (111), 111 states have call successors, (111) [2022-03-20 20:55:53,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 551 transitions. [2022-03-20 20:55:53,352 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 551 transitions. Word has length 58 [2022-03-20 20:55:53,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:53,353 INFO L478 AbstractCegarLoop]: Abstraction has 377 states and 551 transitions. [2022-03-20 20:55:53,353 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:53,353 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 551 transitions. [2022-03-20 20:55:53,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-20 20:55:53,353 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:53,353 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:53,372 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:53,569 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 20:55:53,570 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:53,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:53,570 INFO L85 PathProgramCache]: Analyzing trace with hash 27973409, now seen corresponding path program 1 times [2022-03-20 20:55:53,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:53,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [56587190] [2022-03-20 20:55:53,571 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:53,571 INFO L85 PathProgramCache]: Analyzing trace with hash 27973409, now seen corresponding path program 2 times [2022-03-20 20:55:53,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:53,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199065710] [2022-03-20 20:55:53,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:53,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:53,576 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:53,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [352810770] [2022-03-20 20:55:53,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:53,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:53,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:53,578 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:53,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 20:55:53,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:53,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:53,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 20:55:53,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:53,712 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:53,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:53,824 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:53,825 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:53,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199065710] [2022-03-20 20:55:53,825 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:53,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352810770] [2022-03-20 20:55:53,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352810770] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:53,825 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:53,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 20:55:53,825 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:53,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [56587190] [2022-03-20 20:55:53,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [56587190] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:53,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:53,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 20:55:53,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688073595] [2022-03-20 20:55:53,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:53,826 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 20:55:53,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:53,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 20:55:53,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:53,826 INFO L87 Difference]: Start difference. First operand 377 states and 551 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:53,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:53,928 INFO L93 Difference]: Finished difference Result 604 states and 873 transitions. [2022-03-20 20:55:53,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 20:55:53,928 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 63 [2022-03-20 20:55:53,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:53,930 INFO L225 Difference]: With dead ends: 604 [2022-03-20 20:55:53,930 INFO L226 Difference]: Without dead ends: 440 [2022-03-20 20:55:53,931 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=167, Unknown=0, NotChecked=0, Total=272 [2022-03-20 20:55:53,931 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 69 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:53,931 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 216 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:53,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2022-03-20 20:55:53,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 426. [2022-03-20 20:55:53,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 279 states have (on average 1.3118279569892473) internal successors, (366), 290 states have internal predecessors, (366), 117 states have call successors, (117), 30 states have call predecessors, (117), 29 states have return successors, (115), 105 states have call predecessors, (115), 115 states have call successors, (115) [2022-03-20 20:55:53,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 598 transitions. [2022-03-20 20:55:53,983 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 598 transitions. Word has length 63 [2022-03-20 20:55:53,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:53,983 INFO L478 AbstractCegarLoop]: Abstraction has 426 states and 598 transitions. [2022-03-20 20:55:53,983 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:53,983 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 598 transitions. [2022-03-20 20:55:53,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-03-20 20:55:53,983 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:53,983 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:54,006 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:54,203 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 20:55:54,204 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:54,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:54,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1288112160, now seen corresponding path program 3 times [2022-03-20 20:55:54,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:54,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [840628169] [2022-03-20 20:55:54,204 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:54,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1288112160, now seen corresponding path program 4 times [2022-03-20 20:55:54,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:54,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905284461] [2022-03-20 20:55:54,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:54,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:54,210 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:54,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [112188872] [2022-03-20 20:55:54,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:54,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:54,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:54,216 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:54,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 20:55:54,256 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:54,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:54,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 20:55:54,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:54,352 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:54,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:54,465 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:54,465 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:54,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905284461] [2022-03-20 20:55:54,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:54,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112188872] [2022-03-20 20:55:54,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112188872] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:54,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:54,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2022-03-20 20:55:54,466 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:54,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [840628169] [2022-03-20 20:55:54,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [840628169] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:54,466 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:54,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 20:55:54,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086717880] [2022-03-20 20:55:54,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:54,467 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 20:55:54,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:54,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 20:55:54,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:54,467 INFO L87 Difference]: Start difference. First operand 426 states and 598 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:54,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:54,597 INFO L93 Difference]: Finished difference Result 531 states and 722 transitions. [2022-03-20 20:55:54,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 20:55:54,597 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 64 [2022-03-20 20:55:54,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:54,599 INFO L225 Difference]: With dead ends: 531 [2022-03-20 20:55:54,599 INFO L226 Difference]: Without dead ends: 524 [2022-03-20 20:55:54,600 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=118, Invalid=188, Unknown=0, NotChecked=0, Total=306 [2022-03-20 20:55:54,600 INFO L913 BasicCegarLoop]: 61 mSDtfsCounter, 102 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:54,600 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 242 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:54,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2022-03-20 20:55:54,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 503. [2022-03-20 20:55:54,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 330 states have (on average 1.290909090909091) internal successors, (426), 346 states have internal predecessors, (426), 134 states have call successors, (134), 39 states have call predecessors, (134), 38 states have return successors, (131), 117 states have call predecessors, (131), 131 states have call successors, (131) [2022-03-20 20:55:54,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 691 transitions. [2022-03-20 20:55:54,636 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 691 transitions. Word has length 64 [2022-03-20 20:55:54,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:54,636 INFO L478 AbstractCegarLoop]: Abstraction has 503 states and 691 transitions. [2022-03-20 20:55:54,636 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:54,637 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 691 transitions. [2022-03-20 20:55:54,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 20:55:54,637 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:54,637 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:54,655 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:54,851 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:54,852 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:54,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:54,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1156119236, now seen corresponding path program 1 times [2022-03-20 20:55:54,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:54,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1869411040] [2022-03-20 20:55:54,852 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:54,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1156119236, now seen corresponding path program 2 times [2022-03-20 20:55:54,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:54,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187945632] [2022-03-20 20:55:54,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:54,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:54,858 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:54,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [146258313] [2022-03-20 20:55:54,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:54,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:54,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:54,859 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:54,892 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 20:55:54,904 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:54,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:54,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 20:55:54,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-03-20 20:55:55,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:55,169 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2022-03-20 20:55:55,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:55,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187945632] [2022-03-20 20:55:55,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:55,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146258313] [2022-03-20 20:55:55,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146258313] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 20:55:55,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 20:55:55,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2022-03-20 20:55:55,170 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:55,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1869411040] [2022-03-20 20:55:55,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1869411040] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:55,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:55,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:55,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116215248] [2022-03-20 20:55:55,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:55,171 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:55,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:55,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:55,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 20:55:55,171 INFO L87 Difference]: Start difference. First operand 503 states and 691 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:55,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:55,231 INFO L93 Difference]: Finished difference Result 517 states and 704 transitions. [2022-03-20 20:55:55,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:55:55,231 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 67 [2022-03-20 20:55:55,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:55,233 INFO L225 Difference]: With dead ends: 517 [2022-03-20 20:55:55,233 INFO L226 Difference]: Without dead ends: 515 [2022-03-20 20:55:55,233 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-20 20:55:55,234 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 12 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:55,234 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 150 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:55,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-03-20 20:55:55,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 511. [2022-03-20 20:55:55,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 336 states have (on average 1.2797619047619047) internal successors, (430), 352 states have internal predecessors, (430), 134 states have call successors, (134), 41 states have call predecessors, (134), 40 states have return successors, (131), 117 states have call predecessors, (131), 131 states have call successors, (131) [2022-03-20 20:55:55,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 695 transitions. [2022-03-20 20:55:55,278 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 695 transitions. Word has length 67 [2022-03-20 20:55:55,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:55,278 INFO L478 AbstractCegarLoop]: Abstraction has 511 states and 695 transitions. [2022-03-20 20:55:55,278 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:55,278 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 695 transitions. [2022-03-20 20:55:55,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 20:55:55,279 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:55,279 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:55,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:55,495 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:55,495 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:55,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:55,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1261753774, now seen corresponding path program 3 times [2022-03-20 20:55:55,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:55,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [461931070] [2022-03-20 20:55:55,496 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:55,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1261753774, now seen corresponding path program 4 times [2022-03-20 20:55:55,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:55,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844462703] [2022-03-20 20:55:55,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:55,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:55,501 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:55,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [735257326] [2022-03-20 20:55:55,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:55,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:55,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:55,503 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:55,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 20:55:55,539 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:55,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:55,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 20:55:55,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:55,630 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:55,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:55,731 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:55,731 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:55,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844462703] [2022-03-20 20:55:55,731 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:55,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735257326] [2022-03-20 20:55:55,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735257326] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:55,732 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:55,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-03-20 20:55:55,732 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:55,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [461931070] [2022-03-20 20:55:55,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [461931070] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:55,733 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:55,733 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:55:55,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603680411] [2022-03-20 20:55:55,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:55,733 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:55:55,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:55,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:55:55,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 20:55:55,733 INFO L87 Difference]: Start difference. First operand 511 states and 695 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:56,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:56,069 INFO L93 Difference]: Finished difference Result 857 states and 1271 transitions. [2022-03-20 20:55:56,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 20:55:56,070 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 65 [2022-03-20 20:55:56,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:56,073 INFO L225 Difference]: With dead ends: 857 [2022-03-20 20:55:56,073 INFO L226 Difference]: Without dead ends: 850 [2022-03-20 20:55:56,074 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2022-03-20 20:55:56,074 INFO L913 BasicCegarLoop]: 117 mSDtfsCounter, 82 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:56,074 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 565 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 20:55:56,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2022-03-20 20:55:56,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 567. [2022-03-20 20:55:56,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 380 states have (on average 1.3) internal successors, (494), 395 states have internal predecessors, (494), 146 states have call successors, (146), 41 states have call predecessors, (146), 40 states have return successors, (143), 130 states have call predecessors, (143), 143 states have call successors, (143) [2022-03-20 20:55:56,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 783 transitions. [2022-03-20 20:55:56,123 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 783 transitions. Word has length 65 [2022-03-20 20:55:56,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:56,123 INFO L478 AbstractCegarLoop]: Abstraction has 567 states and 783 transitions. [2022-03-20 20:55:56,123 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:56,123 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 783 transitions. [2022-03-20 20:55:56,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 20:55:56,124 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:56,124 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:56,141 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-20 20:55:56,342 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 20:55:56,342 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:56,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:56,342 INFO L85 PathProgramCache]: Analyzing trace with hash 365174246, now seen corresponding path program 1 times [2022-03-20 20:55:56,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:56,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [103445491] [2022-03-20 20:55:56,343 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:56,343 INFO L85 PathProgramCache]: Analyzing trace with hash 365174246, now seen corresponding path program 2 times [2022-03-20 20:55:56,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:56,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284978002] [2022-03-20 20:55:56,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:56,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:56,348 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:56,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1545543738] [2022-03-20 20:55:56,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:56,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:56,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:56,350 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:56,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 20:55:56,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:56,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:56,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 20:55:56,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:56,514 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:56,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:56,665 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:56,666 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:56,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284978002] [2022-03-20 20:55:56,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:56,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545543738] [2022-03-20 20:55:56,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545543738] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:56,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:56,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 20:55:56,666 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:56,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [103445491] [2022-03-20 20:55:56,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [103445491] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:56,667 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:56,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 20:55:56,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238634498] [2022-03-20 20:55:56,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:56,667 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 20:55:56,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:56,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 20:55:56,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:56,668 INFO L87 Difference]: Start difference. First operand 567 states and 783 transitions. Second operand has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:56,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:56,798 INFO L93 Difference]: Finished difference Result 839 states and 1203 transitions. [2022-03-20 20:55:56,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 20:55:56,799 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 65 [2022-03-20 20:55:56,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:56,801 INFO L225 Difference]: With dead ends: 839 [2022-03-20 20:55:56,801 INFO L226 Difference]: Without dead ends: 567 [2022-03-20 20:55:56,802 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=168, Unknown=0, NotChecked=0, Total=272 [2022-03-20 20:55:56,802 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 85 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:56,803 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 199 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:56,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2022-03-20 20:55:56,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 567. [2022-03-20 20:55:56,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 380 states have (on average 1.2894736842105263) internal successors, (490), 395 states have internal predecessors, (490), 146 states have call successors, (146), 41 states have call predecessors, (146), 40 states have return successors, (143), 130 states have call predecessors, (143), 143 states have call successors, (143) [2022-03-20 20:55:56,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 779 transitions. [2022-03-20 20:55:56,846 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 779 transitions. Word has length 65 [2022-03-20 20:55:56,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:56,846 INFO L478 AbstractCegarLoop]: Abstraction has 567 states and 779 transitions. [2022-03-20 20:55:56,846 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:56,846 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 779 transitions. [2022-03-20 20:55:56,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 20:55:56,847 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:56,847 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:56,865 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:57,063 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 20:55:57,063 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:57,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:57,064 INFO L85 PathProgramCache]: Analyzing trace with hash -544828664, now seen corresponding path program 1 times [2022-03-20 20:55:57,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:57,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1253731032] [2022-03-20 20:55:57,064 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:57,064 INFO L85 PathProgramCache]: Analyzing trace with hash -544828664, now seen corresponding path program 2 times [2022-03-20 20:55:57,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:57,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791144261] [2022-03-20 20:55:57,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:57,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:57,073 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:57,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [800211681] [2022-03-20 20:55:57,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:57,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:57,074 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:57,075 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:57,076 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 20:55:57,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:57,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:57,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 20:55:57,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:57,198 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-03-20 20:55:57,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:55:57,198 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:57,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791144261] [2022-03-20 20:55:57,198 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:57,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800211681] [2022-03-20 20:55:57,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800211681] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:57,198 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:57,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:57,199 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:57,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1253731032] [2022-03-20 20:55:57,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1253731032] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:57,199 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:57,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:55:57,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659780567] [2022-03-20 20:55:57,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:57,199 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:55:57,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:57,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:55:57,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:55:57,200 INFO L87 Difference]: Start difference. First operand 567 states and 779 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:57,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:57,298 INFO L93 Difference]: Finished difference Result 980 states and 1387 transitions. [2022-03-20 20:55:57,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 20:55:57,298 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 69 [2022-03-20 20:55:57,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:57,300 INFO L225 Difference]: With dead ends: 980 [2022-03-20 20:55:57,300 INFO L226 Difference]: Without dead ends: 624 [2022-03-20 20:55:57,301 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:55:57,302 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 11 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:57,302 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 158 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:57,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2022-03-20 20:55:57,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 568. [2022-03-20 20:55:57,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 568 states, 395 states have (on average 1.3012658227848102) internal successors, (514), 400 states have internal predecessors, (514), 134 states have call successors, (134), 39 states have call predecessors, (134), 38 states have return successors, (131), 128 states have call predecessors, (131), 131 states have call successors, (131) [2022-03-20 20:55:57,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 779 transitions. [2022-03-20 20:55:57,385 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 779 transitions. Word has length 69 [2022-03-20 20:55:57,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:57,385 INFO L478 AbstractCegarLoop]: Abstraction has 568 states and 779 transitions. [2022-03-20 20:55:57,385 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:57,385 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 779 transitions. [2022-03-20 20:55:57,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 20:55:57,386 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:57,386 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:57,402 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:57,599 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:57,599 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:57,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:57,600 INFO L85 PathProgramCache]: Analyzing trace with hash -996119216, now seen corresponding path program 3 times [2022-03-20 20:55:57,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:57,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [530749139] [2022-03-20 20:55:57,600 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:57,600 INFO L85 PathProgramCache]: Analyzing trace with hash -996119216, now seen corresponding path program 4 times [2022-03-20 20:55:57,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:57,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798620176] [2022-03-20 20:55:57,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:57,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:57,605 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:57,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [159452103] [2022-03-20 20:55:57,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:57,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:57,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:57,609 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:57,609 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 20:55:57,648 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:57,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:57,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 20:55:57,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:57,762 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 14 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:57,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:57,877 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 14 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:57,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:57,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798620176] [2022-03-20 20:55:57,878 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:57,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159452103] [2022-03-20 20:55:57,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159452103] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:57,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:57,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2022-03-20 20:55:57,878 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:57,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [530749139] [2022-03-20 20:55:57,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [530749139] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:57,879 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:57,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 20:55:57,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992772484] [2022-03-20 20:55:57,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:57,879 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 20:55:57,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:57,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 20:55:57,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:57,879 INFO L87 Difference]: Start difference. First operand 568 states and 779 transitions. Second operand has 10 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:58,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:58,023 INFO L93 Difference]: Finished difference Result 914 states and 1304 transitions. [2022-03-20 20:55:58,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 20:55:58,023 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 69 [2022-03-20 20:55:58,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:58,025 INFO L225 Difference]: With dead ends: 914 [2022-03-20 20:55:58,025 INFO L226 Difference]: Without dead ends: 584 [2022-03-20 20:55:58,028 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2022-03-20 20:55:58,028 INFO L913 BasicCegarLoop]: 61 mSDtfsCounter, 116 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:58,029 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 243 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:58,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2022-03-20 20:55:58,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 575. [2022-03-20 20:55:58,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 402 states have (on average 1.2960199004975124) internal successors, (521), 404 states have internal predecessors, (521), 134 states have call successors, (134), 39 states have call predecessors, (134), 38 states have return successors, (131), 131 states have call predecessors, (131), 131 states have call successors, (131) [2022-03-20 20:55:58,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 786 transitions. [2022-03-20 20:55:58,082 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 786 transitions. Word has length 69 [2022-03-20 20:55:58,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:58,082 INFO L478 AbstractCegarLoop]: Abstraction has 575 states and 786 transitions. [2022-03-20 20:55:58,082 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:58,082 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 786 transitions. [2022-03-20 20:55:58,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-03-20 20:55:58,083 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:58,083 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:58,101 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:58,298 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:58,299 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:58,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:58,299 INFO L85 PathProgramCache]: Analyzing trace with hash 862858316, now seen corresponding path program 3 times [2022-03-20 20:55:58,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:58,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [402658838] [2022-03-20 20:55:58,300 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:58,300 INFO L85 PathProgramCache]: Analyzing trace with hash 862858316, now seen corresponding path program 4 times [2022-03-20 20:55:58,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:58,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716960419] [2022-03-20 20:55:58,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:58,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:58,306 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:58,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1192810143] [2022-03-20 20:55:58,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:58,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:58,307 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:58,308 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:58,363 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 20:55:58,369 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:58,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:58,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 20:55:58,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:58,510 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:58,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:58,637 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:55:58,637 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:58,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716960419] [2022-03-20 20:55:58,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:58,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192810143] [2022-03-20 20:55:58,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192810143] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:58,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:58,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2022-03-20 20:55:58,638 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:58,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [402658838] [2022-03-20 20:55:58,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [402658838] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:58,638 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:58,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 20:55:58,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827016425] [2022-03-20 20:55:58,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:58,638 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 20:55:58,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:58,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 20:55:58,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:55:58,639 INFO L87 Difference]: Start difference. First operand 575 states and 786 transitions. Second operand has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:58,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:58,803 INFO L93 Difference]: Finished difference Result 918 states and 1274 transitions. [2022-03-20 20:55:58,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 20:55:58,803 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 70 [2022-03-20 20:55:58,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:58,806 INFO L225 Difference]: With dead ends: 918 [2022-03-20 20:55:58,806 INFO L226 Difference]: Without dead ends: 688 [2022-03-20 20:55:58,807 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2022-03-20 20:55:58,807 INFO L913 BasicCegarLoop]: 64 mSDtfsCounter, 132 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:58,807 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 263 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:55:58,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2022-03-20 20:55:58,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 658. [2022-03-20 20:55:58,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 658 states, 457 states have (on average 1.2735229759299782) internal successors, (582), 460 states have internal predecessors, (582), 151 states have call successors, (151), 50 states have call predecessors, (151), 49 states have return successors, (147), 147 states have call predecessors, (147), 147 states have call successors, (147) [2022-03-20 20:55:58,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 658 states to 658 states and 880 transitions. [2022-03-20 20:55:58,860 INFO L78 Accepts]: Start accepts. Automaton has 658 states and 880 transitions. Word has length 70 [2022-03-20 20:55:58,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:58,860 INFO L478 AbstractCegarLoop]: Abstraction has 658 states and 880 transitions. [2022-03-20 20:55:58,860 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:55:58,860 INFO L276 IsEmpty]: Start isEmpty. Operand 658 states and 880 transitions. [2022-03-20 20:55:58,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-03-20 20:55:58,861 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:58,861 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:58,878 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:59,076 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-20 20:55:59,077 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:59,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:59,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1546062343, now seen corresponding path program 1 times [2022-03-20 20:55:59,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:59,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2123894553] [2022-03-20 20:55:59,077 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:59,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1546062343, now seen corresponding path program 2 times [2022-03-20 20:55:59,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:59,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222052709] [2022-03-20 20:55:59,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:59,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:59,082 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:59,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768283406] [2022-03-20 20:55:59,082 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:55:59,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:59,083 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:59,083 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:59,084 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 20:55:59,122 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:55:59,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:59,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 20:55:59,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:55:59,246 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 20:55:59,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:55:59,359 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 20:55:59,359 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:55:59,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222052709] [2022-03-20 20:55:59,359 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:55:59,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768283406] [2022-03-20 20:55:59,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768283406] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:55:59,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:55:59,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-03-20 20:55:59,359 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:55:59,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2123894553] [2022-03-20 20:55:59,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2123894553] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:55:59,360 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:55:59,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:55:59,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685817762] [2022-03-20 20:55:59,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:55:59,360 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:55:59,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:59,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:55:59,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-20 20:55:59,361 INFO L87 Difference]: Start difference. First operand 658 states and 880 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:59,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:55:59,488 INFO L93 Difference]: Finished difference Result 757 states and 1022 transitions. [2022-03-20 20:55:59,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:55:59,489 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 70 [2022-03-20 20:55:59,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:55:59,491 INFO L225 Difference]: With dead ends: 757 [2022-03-20 20:55:59,491 INFO L226 Difference]: Without dead ends: 755 [2022-03-20 20:55:59,492 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 20:55:59,492 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 30 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:55:59,492 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 233 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:55:59,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2022-03-20 20:55:59,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 748. [2022-03-20 20:55:59,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 748 states, 537 states have (on average 1.297951582867784) internal successors, (697), 546 states have internal predecessors, (697), 160 states have call successors, (160), 51 states have call predecessors, (160), 50 states have return successors, (156), 150 states have call predecessors, (156), 156 states have call successors, (156) [2022-03-20 20:55:59,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 1013 transitions. [2022-03-20 20:55:59,576 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 1013 transitions. Word has length 70 [2022-03-20 20:55:59,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:55:59,576 INFO L478 AbstractCegarLoop]: Abstraction has 748 states and 1013 transitions. [2022-03-20 20:55:59,576 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:55:59,577 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 1013 transitions. [2022-03-20 20:55:59,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 20:55:59,578 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:55:59,578 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:55:59,595 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 20:55:59,793 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 20:55:59,794 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:55:59,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:55:59,794 INFO L85 PathProgramCache]: Analyzing trace with hash -705069158, now seen corresponding path program 3 times [2022-03-20 20:55:59,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:55:59,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1255628620] [2022-03-20 20:55:59,794 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:55:59,794 INFO L85 PathProgramCache]: Analyzing trace with hash -705069158, now seen corresponding path program 4 times [2022-03-20 20:55:59,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:55:59,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761309966] [2022-03-20 20:55:59,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:55:59,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:55:59,802 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:55:59,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1408188046] [2022-03-20 20:55:59,802 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:55:59,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:55:59,802 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:55:59,803 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:55:59,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 20:55:59,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:55:59,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:55:59,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 65 conjunts are in the unsatisfiable core [2022-03-20 20:55:59,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:00,406 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 8 proven. 52 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 20:56:00,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:00,888 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 27 proven. 30 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-20 20:56:00,889 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:00,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761309966] [2022-03-20 20:56:00,889 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:00,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408188046] [2022-03-20 20:56:00,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408188046] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:00,889 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:00,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 22 [2022-03-20 20:56:00,889 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:00,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1255628620] [2022-03-20 20:56:00,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1255628620] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:00,889 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:00,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 20:56:00,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841846154] [2022-03-20 20:56:00,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:00,890 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 20:56:00,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:00,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 20:56:00,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2022-03-20 20:56:00,890 INFO L87 Difference]: Start difference. First operand 748 states and 1013 transitions. Second operand has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 20:56:01,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:01,327 INFO L93 Difference]: Finished difference Result 840 states and 1136 transitions. [2022-03-20 20:56:01,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 20:56:01,327 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) Word has length 75 [2022-03-20 20:56:01,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:01,330 INFO L225 Difference]: With dead ends: 840 [2022-03-20 20:56:01,330 INFO L226 Difference]: Without dead ends: 838 [2022-03-20 20:56:01,330 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2022-03-20 20:56:01,331 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 81 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 647 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:01,331 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 647 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 20:56:01,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838 states. [2022-03-20 20:56:01,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 838 to 813. [2022-03-20 20:56:01,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 813 states, 579 states have (on average 1.302245250431779) internal successors, (754), 589 states have internal predecessors, (754), 178 states have call successors, (178), 56 states have call predecessors, (178), 55 states have return successors, (174), 167 states have call predecessors, (174), 174 states have call successors, (174) [2022-03-20 20:56:01,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 813 states to 813 states and 1106 transitions. [2022-03-20 20:56:01,411 INFO L78 Accepts]: Start accepts. Automaton has 813 states and 1106 transitions. Word has length 75 [2022-03-20 20:56:01,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:01,411 INFO L478 AbstractCegarLoop]: Abstraction has 813 states and 1106 transitions. [2022-03-20 20:56:01,411 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 20:56:01,411 INFO L276 IsEmpty]: Start isEmpty. Operand 813 states and 1106 transitions. [2022-03-20 20:56:01,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-03-20 20:56:01,412 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:01,412 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:01,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:01,627 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 [2022-03-20 20:56:01,628 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:01,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:01,628 INFO L85 PathProgramCache]: Analyzing trace with hash -949871629, now seen corresponding path program 5 times [2022-03-20 20:56:01,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:01,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [506047924] [2022-03-20 20:56:01,628 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:01,629 INFO L85 PathProgramCache]: Analyzing trace with hash -949871629, now seen corresponding path program 6 times [2022-03-20 20:56:01,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:01,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587585534] [2022-03-20 20:56:01,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:01,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:01,633 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:01,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1468533273] [2022-03-20 20:56:01,634 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 20:56:01,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:01,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:01,637 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) [2022-03-20 20:56:01,638 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 20:56:01,691 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 20:56:01,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:01,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 20:56:01,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:01,826 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:56:01,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:56:01,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:01,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587585534] [2022-03-20 20:56:01,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:01,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468533273] [2022-03-20 20:56:01,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468533273] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:01,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:01,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2022-03-20 20:56:01,942 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:01,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [506047924] [2022-03-20 20:56:01,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [506047924] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:01,942 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:01,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 20:56:01,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211116755] [2022-03-20 20:56:01,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:01,942 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 20:56:01,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:01,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 20:56:01,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:56:01,943 INFO L87 Difference]: Start difference. First operand 813 states and 1106 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:56:02,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:02,185 INFO L93 Difference]: Finished difference Result 1433 states and 1997 transitions. [2022-03-20 20:56:02,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 20:56:02,185 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 76 [2022-03-20 20:56:02,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:02,189 INFO L225 Difference]: With dead ends: 1433 [2022-03-20 20:56:02,189 INFO L226 Difference]: Without dead ends: 975 [2022-03-20 20:56:02,190 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2022-03-20 20:56:02,190 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 156 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:02,191 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 307 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:56:02,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 975 states. [2022-03-20 20:56:02,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 975 to 947. [2022-03-20 20:56:02,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 947 states, 673 states have (on average 1.274888558692422) internal successors, (858), 683 states have internal predecessors, (858), 205 states have call successors, (205), 69 states have call predecessors, (205), 68 states have return successors, (200), 194 states have call predecessors, (200), 200 states have call successors, (200) [2022-03-20 20:56:02,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 947 states to 947 states and 1263 transitions. [2022-03-20 20:56:02,303 INFO L78 Accepts]: Start accepts. Automaton has 947 states and 1263 transitions. Word has length 76 [2022-03-20 20:56:02,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:02,303 INFO L478 AbstractCegarLoop]: Abstraction has 947 states and 1263 transitions. [2022-03-20 20:56:02,303 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 20:56:02,303 INFO L276 IsEmpty]: Start isEmpty. Operand 947 states and 1263 transitions. [2022-03-20 20:56:02,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-20 20:56:02,304 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:02,304 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:02,320 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:02,511 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 [2022-03-20 20:56:02,511 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:02,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:02,511 INFO L85 PathProgramCache]: Analyzing trace with hash -362795852, now seen corresponding path program 1 times [2022-03-20 20:56:02,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:02,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [337177103] [2022-03-20 20:56:02,512 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:02,512 INFO L85 PathProgramCache]: Analyzing trace with hash -362795852, now seen corresponding path program 2 times [2022-03-20 20:56:02,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:02,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862800474] [2022-03-20 20:56:02,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:02,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:02,518 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:02,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [846918692] [2022-03-20 20:56:02,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:56:02,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:02,519 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:02,520 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) [2022-03-20 20:56:02,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 20:56:02,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:56:02,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:02,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-20 20:56:02,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:03,095 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 30 proven. 20 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-03-20 20:56:03,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:04,615 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 30 proven. 20 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-03-20 20:56:04,616 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:04,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862800474] [2022-03-20 20:56:04,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:04,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846918692] [2022-03-20 20:56:04,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846918692] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:04,616 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:04,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 22 [2022-03-20 20:56:04,616 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:04,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [337177103] [2022-03-20 20:56:04,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [337177103] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:04,616 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:04,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 20:56:04,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338025472] [2022-03-20 20:56:04,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:04,617 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 20:56:04,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:04,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 20:56:04,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2022-03-20 20:56:04,617 INFO L87 Difference]: Start difference. First operand 947 states and 1263 transitions. Second operand has 13 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-03-20 20:56:06,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:06,046 INFO L93 Difference]: Finished difference Result 1025 states and 1371 transitions. [2022-03-20 20:56:06,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 20:56:06,046 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 81 [2022-03-20 20:56:06,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:06,049 INFO L225 Difference]: With dead ends: 1025 [2022-03-20 20:56:06,050 INFO L226 Difference]: Without dead ends: 1022 [2022-03-20 20:56:06,050 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2022-03-20 20:56:06,050 INFO L913 BasicCegarLoop]: 63 mSDtfsCounter, 76 mSDsluCounter, 490 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:06,050 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 553 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 20:56:06,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1022 states. [2022-03-20 20:56:06,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1022 to 957. [2022-03-20 20:56:06,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 679 states have (on average 1.2695139911634756) internal successors, (862), 689 states have internal predecessors, (862), 207 states have call successors, (207), 71 states have call predecessors, (207), 70 states have return successors, (203), 196 states have call predecessors, (203), 203 states have call successors, (203) [2022-03-20 20:56:06,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 1272 transitions. [2022-03-20 20:56:06,154 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 1272 transitions. Word has length 81 [2022-03-20 20:56:06,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:06,154 INFO L478 AbstractCegarLoop]: Abstraction has 957 states and 1272 transitions. [2022-03-20 20:56:06,154 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-03-20 20:56:06,154 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 1272 transitions. [2022-03-20 20:56:06,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-20 20:56:06,155 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:06,155 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:06,173 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:06,370 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 [2022-03-20 20:56:06,371 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:06,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:06,371 INFO L85 PathProgramCache]: Analyzing trace with hash -2112645673, now seen corresponding path program 1 times [2022-03-20 20:56:06,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:06,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [722618954] [2022-03-20 20:56:06,372 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:06,372 INFO L85 PathProgramCache]: Analyzing trace with hash -2112645673, now seen corresponding path program 2 times [2022-03-20 20:56:06,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:06,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018620796] [2022-03-20 20:56:06,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:06,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:06,378 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:06,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [43333203] [2022-03-20 20:56:06,379 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:56:06,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:06,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:06,380 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) [2022-03-20 20:56:06,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 20:56:06,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:56:06,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:06,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 20:56:06,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 16 proven. 88 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 20:56:06,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:06,744 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 16 proven. 24 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2022-03-20 20:56:06,744 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:06,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018620796] [2022-03-20 20:56:06,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:06,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43333203] [2022-03-20 20:56:06,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43333203] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:06,745 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:06,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2022-03-20 20:56:06,745 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:06,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [722618954] [2022-03-20 20:56:06,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [722618954] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:06,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:06,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 20:56:06,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239304884] [2022-03-20 20:56:06,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:06,746 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 20:56:06,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:06,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 20:56:06,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:56:06,746 INFO L87 Difference]: Start difference. First operand 957 states and 1272 transitions. Second operand has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:06,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:06,971 INFO L93 Difference]: Finished difference Result 966 states and 1279 transitions. [2022-03-20 20:56:06,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 20:56:06,972 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 87 [2022-03-20 20:56:06,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:06,975 INFO L225 Difference]: With dead ends: 966 [2022-03-20 20:56:06,975 INFO L226 Difference]: Without dead ends: 959 [2022-03-20 20:56:06,975 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 160 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=129, Invalid=213, Unknown=0, NotChecked=0, Total=342 [2022-03-20 20:56:06,975 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 132 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:06,976 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 250 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:56:06,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 959 states. [2022-03-20 20:56:07,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 959 to 957. [2022-03-20 20:56:07,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 679 states have (on average 1.2665684830633284) internal successors, (860), 689 states have internal predecessors, (860), 207 states have call successors, (207), 71 states have call predecessors, (207), 70 states have return successors, (203), 196 states have call predecessors, (203), 203 states have call successors, (203) [2022-03-20 20:56:07,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 1270 transitions. [2022-03-20 20:56:07,081 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 1270 transitions. Word has length 87 [2022-03-20 20:56:07,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:07,081 INFO L478 AbstractCegarLoop]: Abstraction has 957 states and 1270 transitions. [2022-03-20 20:56:07,081 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 10 states have internal predecessors, (42), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:07,081 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 1270 transitions. [2022-03-20 20:56:07,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-03-20 20:56:07,082 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:07,082 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:07,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:07,285 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 [2022-03-20 20:56:07,285 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:07,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:07,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1082523945, now seen corresponding path program 3 times [2022-03-20 20:56:07,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:07,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [743049476] [2022-03-20 20:56:07,286 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:07,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1082523945, now seen corresponding path program 4 times [2022-03-20 20:56:07,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:07,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044513953] [2022-03-20 20:56:07,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:07,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:07,290 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:07,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1205958589] [2022-03-20 20:56:07,291 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 20:56:07,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:07,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:07,292 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) [2022-03-20 20:56:07,293 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 20:56:07,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 20:56:07,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:07,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 78 conjunts are in the unsatisfiable core [2022-03-20 20:56:07,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:08,232 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 40 proven. 47 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2022-03-20 20:56:08,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:08,940 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 20:56:09,658 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:09,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044513953] [2022-03-20 20:56:09,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:09,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205958589] [2022-03-20 20:56:09,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205958589] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 20:56:09,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 20:56:09,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-03-20 20:56:09,659 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:09,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [743049476] [2022-03-20 20:56:09,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [743049476] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:09,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:09,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 20:56:09,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581269218] [2022-03-20 20:56:09,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:09,660 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 20:56:09,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:09,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 20:56:09,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2022-03-20 20:56:09,660 INFO L87 Difference]: Start difference. First operand 957 states and 1270 transitions. Second operand has 17 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:11,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:11,326 INFO L93 Difference]: Finished difference Result 1069 states and 1430 transitions. [2022-03-20 20:56:11,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 20:56:11,326 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 88 [2022-03-20 20:56:11,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:11,330 INFO L225 Difference]: With dead ends: 1069 [2022-03-20 20:56:11,330 INFO L226 Difference]: Without dead ends: 1066 [2022-03-20 20:56:11,331 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=156, Invalid=836, Unknown=0, NotChecked=0, Total=992 [2022-03-20 20:56:11,331 INFO L913 BasicCegarLoop]: 75 mSDtfsCounter, 92 mSDsluCounter, 829 mSDsCounter, 0 mSdLazyCounter, 914 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 904 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:11,331 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 904 Invalid, 969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 914 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 20:56:11,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2022-03-20 20:56:11,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1023. [2022-03-20 20:56:11,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1023 states, 720 states have (on average 1.275) internal successors, (918), 731 states have internal predecessors, (918), 229 states have call successors, (229), 74 states have call predecessors, (229), 73 states have return successors, (225), 217 states have call predecessors, (225), 225 states have call successors, (225) [2022-03-20 20:56:11,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1023 states to 1023 states and 1372 transitions. [2022-03-20 20:56:11,444 INFO L78 Accepts]: Start accepts. Automaton has 1023 states and 1372 transitions. Word has length 88 [2022-03-20 20:56:11,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:11,445 INFO L478 AbstractCegarLoop]: Abstraction has 1023 states and 1372 transitions. [2022-03-20 20:56:11,445 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:11,445 INFO L276 IsEmpty]: Start isEmpty. Operand 1023 states and 1372 transitions. [2022-03-20 20:56:11,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 20:56:11,446 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:11,446 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:11,462 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:11,662 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 [2022-03-20 20:56:11,662 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:11,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:11,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1791236545, now seen corresponding path program 5 times [2022-03-20 20:56:11,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:11,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1454331439] [2022-03-20 20:56:11,663 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:11,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1791236545, now seen corresponding path program 6 times [2022-03-20 20:56:11,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:11,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575554219] [2022-03-20 20:56:11,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:11,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:11,668 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:11,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121905022] [2022-03-20 20:56:11,668 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 20:56:11,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:11,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:11,671 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) [2022-03-20 20:56:11,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 20:56:11,728 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 20:56:11,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:11,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 20:56:11,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:11,900 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 98 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 20:56:11,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:12,034 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 34 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2022-03-20 20:56:12,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:12,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575554219] [2022-03-20 20:56:12,034 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:12,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121905022] [2022-03-20 20:56:12,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121905022] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:12,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:12,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2022-03-20 20:56:12,035 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:12,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1454331439] [2022-03-20 20:56:12,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1454331439] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:12,035 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:12,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 20:56:12,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028115572] [2022-03-20 20:56:12,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:12,035 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 20:56:12,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:12,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 20:56:12,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:56:12,036 INFO L87 Difference]: Start difference. First operand 1023 states and 1372 transitions. Second operand has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 11 states have internal predecessors, (46), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:12,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:12,268 INFO L93 Difference]: Finished difference Result 1058 states and 1407 transitions. [2022-03-20 20:56:12,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 20:56:12,269 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 11 states have internal predecessors, (46), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 91 [2022-03-20 20:56:12,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:12,272 INFO L225 Difference]: With dead ends: 1058 [2022-03-20 20:56:12,272 INFO L226 Difference]: Without dead ends: 1051 [2022-03-20 20:56:12,272 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 168 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=140, Invalid=240, Unknown=0, NotChecked=0, Total=380 [2022-03-20 20:56:12,273 INFO L913 BasicCegarLoop]: 69 mSDtfsCounter, 150 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:12,273 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 298 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:56:12,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1051 states. [2022-03-20 20:56:12,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1051 to 1034. [2022-03-20 20:56:12,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1034 states, 731 states have (on average 1.2708618331053352) internal successors, (929), 742 states have internal predecessors, (929), 229 states have call successors, (229), 74 states have call predecessors, (229), 73 states have return successors, (225), 217 states have call predecessors, (225), 225 states have call successors, (225) [2022-03-20 20:56:12,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1383 transitions. [2022-03-20 20:56:12,389 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1383 transitions. Word has length 91 [2022-03-20 20:56:12,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:12,389 INFO L478 AbstractCegarLoop]: Abstraction has 1034 states and 1383 transitions. [2022-03-20 20:56:12,389 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 11 states have internal predecessors, (46), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:12,389 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1383 transitions. [2022-03-20 20:56:12,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-20 20:56:12,390 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:12,390 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:12,406 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:12,603 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 [2022-03-20 20:56:12,603 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:12,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:12,604 INFO L85 PathProgramCache]: Analyzing trace with hash -554609469, now seen corresponding path program 1 times [2022-03-20 20:56:12,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:12,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2055087661] [2022-03-20 20:56:12,604 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:12,604 INFO L85 PathProgramCache]: Analyzing trace with hash -554609469, now seen corresponding path program 2 times [2022-03-20 20:56:12,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:12,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798711265] [2022-03-20 20:56:12,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:12,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:12,611 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:12,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [801731504] [2022-03-20 20:56:12,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:56:12,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:12,611 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:12,614 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) [2022-03-20 20:56:12,615 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 20:56:12,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:56:12,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:12,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 20:56:12,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:12,854 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 24 proven. 96 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 20:56:12,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 24 proven. 32 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2022-03-20 20:56:12,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:12,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798711265] [2022-03-20 20:56:12,988 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:12,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801731504] [2022-03-20 20:56:12,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801731504] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:12,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:12,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2022-03-20 20:56:12,988 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:12,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2055087661] [2022-03-20 20:56:12,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2055087661] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:12,989 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:12,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 20:56:12,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838823624] [2022-03-20 20:56:12,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:12,989 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 20:56:12,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:12,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 20:56:12,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-20 20:56:12,989 INFO L87 Difference]: Start difference. First operand 1034 states and 1383 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:13,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:13,235 INFO L93 Difference]: Finished difference Result 1378 states and 1899 transitions. [2022-03-20 20:56:13,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 20:56:13,236 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 93 [2022-03-20 20:56:13,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:13,239 INFO L225 Difference]: With dead ends: 1378 [2022-03-20 20:56:13,239 INFO L226 Difference]: Without dead ends: 1058 [2022-03-20 20:56:13,240 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 172 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=242, Unknown=0, NotChecked=0, Total=380 [2022-03-20 20:56:13,241 INFO L913 BasicCegarLoop]: 69 mSDtfsCounter, 162 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:13,241 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 290 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:56:13,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1058 states. [2022-03-20 20:56:13,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1058 to 1054. [2022-03-20 20:56:13,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1054 states, 751 states have (on average 1.2623169107856191) internal successors, (948), 762 states have internal predecessors, (948), 229 states have call successors, (229), 74 states have call predecessors, (229), 73 states have return successors, (225), 217 states have call predecessors, (225), 225 states have call successors, (225) [2022-03-20 20:56:13,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1054 states to 1054 states and 1402 transitions. [2022-03-20 20:56:13,361 INFO L78 Accepts]: Start accepts. Automaton has 1054 states and 1402 transitions. Word has length 93 [2022-03-20 20:56:13,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:13,361 INFO L478 AbstractCegarLoop]: Abstraction has 1054 states and 1402 transitions. [2022-03-20 20:56:13,361 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:13,361 INFO L276 IsEmpty]: Start isEmpty. Operand 1054 states and 1402 transitions. [2022-03-20 20:56:13,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 20:56:13,362 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:13,362 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:13,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:13,580 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 [2022-03-20 20:56:13,580 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:13,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:13,580 INFO L85 PathProgramCache]: Analyzing trace with hash -2034142563, now seen corresponding path program 5 times [2022-03-20 20:56:13,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:13,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1003403306] [2022-03-20 20:56:13,581 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:13,581 INFO L85 PathProgramCache]: Analyzing trace with hash -2034142563, now seen corresponding path program 6 times [2022-03-20 20:56:13,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:13,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117362240] [2022-03-20 20:56:13,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:13,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:13,586 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:13,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1016963579] [2022-03-20 20:56:13,586 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 20:56:13,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:13,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:13,588 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) [2022-03-20 20:56:13,589 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 20:56:13,707 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 20:56:13,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:56:13,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 20:56:13,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:56:13,886 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 24 proven. 108 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 20:56:13,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:56:14,009 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2022-03-20 20:56:14,010 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:56:14,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117362240] [2022-03-20 20:56:14,010 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:56:14,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016963579] [2022-03-20 20:56:14,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016963579] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:56:14,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:56:14,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2022-03-20 20:56:14,010 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:56:14,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1003403306] [2022-03-20 20:56:14,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1003403306] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:56:14,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:56:14,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 20:56:14,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913189603] [2022-03-20 20:56:14,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:56:14,011 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 20:56:14,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:14,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 20:56:14,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2022-03-20 20:56:14,012 INFO L87 Difference]: Start difference. First operand 1054 states and 1402 transitions. Second operand has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:14,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:56:14,298 INFO L93 Difference]: Finished difference Result 1535 states and 2087 transitions. [2022-03-20 20:56:14,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 20:56:14,299 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 97 [2022-03-20 20:56:14,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:56:14,303 INFO L225 Difference]: With dead ends: 1535 [2022-03-20 20:56:14,303 INFO L226 Difference]: Without dead ends: 1215 [2022-03-20 20:56:14,304 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=139, Invalid=241, Unknown=0, NotChecked=0, Total=380 [2022-03-20 20:56:14,304 INFO L913 BasicCegarLoop]: 73 mSDtfsCounter, 181 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:56:14,304 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 314 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:56:14,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1215 states. [2022-03-20 20:56:14,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1215 to 1160. [2022-03-20 20:56:14,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1160 states, 809 states have (on average 1.2571075401730532) internal successors, (1017), 821 states have internal predecessors, (1017), 262 states have call successors, (262), 89 states have call predecessors, (262), 88 states have return successors, (257), 249 states have call predecessors, (257), 257 states have call successors, (257) [2022-03-20 20:56:14,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1536 transitions. [2022-03-20 20:56:14,439 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1536 transitions. Word has length 97 [2022-03-20 20:56:14,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:56:14,439 INFO L478 AbstractCegarLoop]: Abstraction has 1160 states and 1536 transitions. [2022-03-20 20:56:14,439 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2022-03-20 20:56:14,439 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1536 transitions. [2022-03-20 20:56:14,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-03-20 20:56:14,440 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:56:14,440 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:56:14,456 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:14,656 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 [2022-03-20 20:56:14,656 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:56:14,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:56:14,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1787026468, now seen corresponding path program 7 times [2022-03-20 20:56:14,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:56:14,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1846350469] [2022-03-20 20:56:14,657 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:56:14,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1787026468, now seen corresponding path program 8 times [2022-03-20 20:56:14,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:56:14,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997376006] [2022-03-20 20:56:14,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:56:14,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:56:14,662 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:56:14,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [392088945] [2022-03-20 20:56:14,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:56:14,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:56:14,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:56:14,665 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) [2022-03-20 20:56:14,667 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 20:56:14,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:56:14,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2022-03-20 20:56:14,724 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 20:56:14,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 20:56:14,796 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 20:56:14,796 INFO L130 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found a feasible trace [2022-03-20 20:56:14,796 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-03-20 20:56:14,798 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 20:56:14,817 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 20:56:14,999 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 [2022-03-20 20:56:15,002 INFO L719 BasicCegarLoop]: Path program histogram: [8, 6, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2] [2022-03-20 20:56:15,003 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-20 20:56:15,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.03 08:56:15 BoogieIcfgContainer [2022-03-20 20:56:15,015 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-20 20:56:15,015 INFO L158 Benchmark]: Toolchain (without parser) took 36857.19ms. Allocated memory was 189.8MB in the beginning and 398.5MB in the end (delta: 208.7MB). Free memory was 140.4MB in the beginning and 344.0MB in the end (delta: -203.6MB). Peak memory consumption was 5.0MB. Max. memory is 8.0GB. [2022-03-20 20:56:15,015 INFO L158 Benchmark]: CDTParser took 0.12ms. Allocated memory is still 189.8MB. Free memory was 157.2MB in the beginning and 157.0MB in the end (delta: 151.9kB). There was no memory consumed. Max. memory is 8.0GB. [2022-03-20 20:56:15,016 INFO L158 Benchmark]: CACSL2BoogieTranslator took 211.26ms. Allocated memory is still 189.8MB. Free memory was 140.3MB in the beginning and 164.5MB in the end (delta: -24.3MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-20 20:56:15,016 INFO L158 Benchmark]: Boogie Preprocessor took 35.46ms. Allocated memory is still 189.8MB. Free memory was 164.5MB in the beginning and 163.3MB in the end (delta: 1.3MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-03-20 20:56:15,016 INFO L158 Benchmark]: RCFGBuilder took 198.21ms. Allocated memory is still 189.8MB. Free memory was 163.3MB in the beginning and 151.7MB in the end (delta: 11.5MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-20 20:56:15,016 INFO L158 Benchmark]: TraceAbstraction took 36409.23ms. Allocated memory was 189.8MB in the beginning and 398.5MB in the end (delta: 208.7MB). Free memory was 151.3MB in the beginning and 344.0MB in the end (delta: -192.7MB). Peak memory consumption was 16.9MB. Max. memory is 8.0GB. [2022-03-20 20:56:15,016 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12ms. Allocated memory is still 189.8MB. Free memory was 157.2MB in the beginning and 157.0MB in the end (delta: 151.9kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 211.26ms. Allocated memory is still 189.8MB. Free memory was 140.3MB in the beginning and 164.5MB in the end (delta: -24.3MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 35.46ms. Allocated memory is still 189.8MB. Free memory was 164.5MB in the beginning and 163.3MB in the end (delta: 1.3MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 198.21ms. Allocated memory is still 189.8MB. Free memory was 163.3MB in the beginning and 151.7MB in the end (delta: 11.5MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * TraceAbstraction took 36409.23ms. Allocated memory was 189.8MB in the beginning and 398.5MB in the end (delta: 208.7MB). Free memory was 151.3MB in the beginning and 344.0MB in the end (delta: -192.7MB). Peak memory consumption was 16.9MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 13]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L18] int counter = 0; [L20] int x, y; [L21] long long a, b, p, q, r, s; [L22] x = __VERIFIER_nondet_int() [L23] y = __VERIFIER_nondet_int() [L24] CALL assume_abort_if_not(x >= 1) [L8] COND FALSE !(!cond) [L24] RET assume_abort_if_not(x >= 1) [L25] CALL assume_abort_if_not(y >= 1) [L8] COND FALSE !(!cond) [L25] RET assume_abort_if_not(y >= 1) [L27] a = x [L28] b = y [L29] p = 1 [L30] q = 0 [L31] r = 0 [L32] s = 1 [L34] EXPR counter++ [L34] COND TRUE counter++<10 [L35] COND FALSE !(!(b != 0)) [L37] long long c, k; [L38] c = a [L39] k = 0 [L41] EXPR counter++ [L41] COND TRUE counter++<10 [L42] COND TRUE !(c >= b) [L63] a = b [L64] b = c [L65] long long temp; [L66] temp = p [L67] p = q [L68] q = temp - q * k [L69] temp = r [L70] r = s [L71] s = temp - s * k [L34] EXPR counter++ [L34] COND TRUE counter++<10 [L35] COND FALSE !(!(b != 0)) [L37] long long c, k; [L38] c = a [L39] k = 0 [L41] EXPR counter++ [L41] COND TRUE counter++<10 [L42] COND FALSE !(!(c >= b)) [L44] long long d, v; [L45] d = 1 [L46] v = b [L48] EXPR counter++ [L48] COND TRUE counter++<10 [L49] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L49] RET __VERIFIER_assert(a == y * r + x * p) [L50] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(b == x * q + y * s) [L51] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(a == k * b + c) [L52] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(v == b * d) [L54] COND TRUE !(c >= 2 * v) [L59] c = c - v [L60] k = k + d [L41] EXPR counter++ [L41] COND TRUE counter++<10 [L42] COND TRUE !(c >= b) [L63] a = b [L64] b = c [L65] long long temp; [L66] temp = p [L67] p = q [L68] q = temp - q * k [L69] temp = r [L70] r = s [L71] s = temp - s * k [L34] EXPR counter++ [L34] COND TRUE counter++<10 [L35] COND FALSE !(!(b != 0)) [L37] long long c, k; [L38] c = a [L39] k = 0 [L41] EXPR counter++ [L41] COND TRUE counter++<10 [L42] COND FALSE !(!(c >= b)) [L44] long long d, v; [L45] d = 1 [L46] v = b [L48] EXPR counter++ [L48] COND TRUE counter++<10 [L49] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L49] RET __VERIFIER_assert(a == y * r + x * p) [L50] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(b == x * q + y * s) [L51] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(a == k * b + c) [L52] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(v == b * d) [L54] COND TRUE !(c >= 2 * v) [L59] c = c - v [L60] k = k + d [L41] EXPR counter++ [L41] COND TRUE counter++<10 [L42] COND TRUE !(c >= b) [L63] a = b [L64] b = c [L65] long long temp; [L66] temp = p [L67] p = q [L68] q = temp - q * k [L69] temp = r [L70] r = s [L71] s = temp - s * k [L34] EXPR counter++ [L34] COND FALSE !(counter++<10) [L73] CALL __VERIFIER_assert(p*x - q*x + r*y - s*y == a) [L11] COND TRUE !(cond) [L13] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 43 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 36.4s, OverallIterations: 35, TraceHistogramMax: 9, PathProgramHistogramMax: 8, EmptinessCheckTime: 0.0s, AutomataDifference: 7.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 2416 SdHoareTripleChecker+Valid, 3.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 2302 mSDsluCounter, 9545 SdHoareTripleChecker+Invalid, 2.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 7617 mSDsCounter, 1226 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 5012 IncrementalHoareTripleChecker+Invalid, 6238 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 1226 mSolverCounterUnsat, 1928 mSDtfsCounter, 5012 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 3502 GetRequests, 3037 SyntacticMatches, 22 SemanticMatches, 443 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 939 ImplicationChecksByTransitivity, 11.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1160occurred in iteration=34, InterpolantAutomatonStates: 364, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.7s AutomataMinimizationTime, 34 MinimizatonAttempts, 848 StatesRemovedByMinimization, 30 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-03-20 20:56:15,027 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...