/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:22:09,505 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:22:09,507 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:22:09,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:22:09,550 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:22:09,551 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:22:09,553 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:22:09,554 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:22:09,556 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:22:09,557 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:22:09,558 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:22:09,562 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:22:09,563 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:22:09,564 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:22:09,564 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:22:09,566 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:22:09,571 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:22:09,577 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:22:09,577 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:22:09,578 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:22:09,605 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 17:22:09,652 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:22:09,652 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:22:09,654 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:22:09,654 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:22:09,654 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:22:09,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:22:09,654 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:22:09,654 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:22:09,654 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:22:09,655 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:22:09,655 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:22:09,655 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:22:09,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:22:09,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:22:09,657 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:22:09,657 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:22:09,959 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:22:09,983 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:22:09,985 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:22:09,985 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:22:09,986 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:22:09,986 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound50.c [2021-05-02 17:22:10,021 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf363920/0115fd5b0414497c82f77c81cbb2d5fa/FLAG6bc791a05 [2021-05-02 17:22:10,372 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:22:10,372 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound50.c [2021-05-02 17:22:10,377 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf363920/0115fd5b0414497c82f77c81cbb2d5fa/FLAG6bc791a05 [2021-05-02 17:22:10,805 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf363920/0115fd5b0414497c82f77c81cbb2d5fa [2021-05-02 17:22:10,807 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:22:10,809 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:22:10,811 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:22:10,811 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:22:10,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:22:10,814 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:10,815 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10e9effb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10, skipping insertion in model container [2021-05-02 17:22:10,815 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:10,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:22:10,829 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:22:10,907 WARN L224 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/ps6-ll_valuebound50.c[458,471] [2021-05-02 17:22:10,916 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:22:10,932 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:22:10,961 WARN L224 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/ps6-ll_valuebound50.c[458,471] [2021-05-02 17:22:10,965 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:22:10,973 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:22:10,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10 WrapperNode [2021-05-02 17:22:10,973 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:22:10,974 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:22:10,974 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:22:10,974 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:22:10,981 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:10,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,009 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,015 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,015 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... [2021-05-02 17:22:11,017 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:22:11,017 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:22:11,017 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:22:11,017 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:22:11,018 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:22:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:22:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:22:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:22:11,083 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:22:11,083 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:22:11,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:22:11,083 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:22:11,084 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:22:11,084 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:22:11,085 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:22:11,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:22:11,085 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:22:11,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:22:11,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:22:11,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:22:11,297 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:22:11,298 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:22:11,298 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:22:11 BoogieIcfgContainer [2021-05-02 17:22:11,299 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:22:11,299 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:22:11,300 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:22:11,301 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:22:11,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:22:10" (1/3) ... [2021-05-02 17:22:11,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@866bc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:22:11, skipping insertion in model container [2021-05-02 17:22:11,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:22:10" (2/3) ... [2021-05-02 17:22:11,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@866bc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:22:11, skipping insertion in model container [2021-05-02 17:22:11,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:22:11" (3/3) ... [2021-05-02 17:22:11,303 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_valuebound50.c [2021-05-02 17:22:11,306 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:22:11,308 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:22:11,335 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:22:11,365 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:22:11,365 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:22:11,365 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:22:11,365 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:22:11,365 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:22:11,365 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:22:11,365 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:22:11,365 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:22:11,398 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:22:11,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:22:11,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:22:11,402 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:22:11,402 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:22:11,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:22:11,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1098891495, now seen corresponding path program 1 times [2021-05-02 17:22:11,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:22:11,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356655092] [2021-05-02 17:22:11,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:22:11,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:22:11,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:22:11,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:22:11,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:22:11,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:22:11,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 17:22:11,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:22:11,639 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:22:11,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:22:11,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356655092] [2021-05-02 17:22:11,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356655092] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:22:11,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:22:11,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:22:11,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838083310] [2021-05-02 17:22:11,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:22:11,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:22:11,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:22:11,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:22:11,655 INFO L87 Difference]: Start difference. First operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) 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) [2021-05-02 17:22:13,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:22:13,813 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2021-05-02 17:22:13,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:22:13,815 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 [2021-05-02 17:22:13,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:22:13,820 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:22:13,820 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:22:13,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:22:13,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:22:13,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:22:13,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:22:13,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:22:13,845 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 22 [2021-05-02 17:22:13,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:22:13,845 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:22:13,845 INFO L481 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) [2021-05-02 17:22:13,845 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:22:13,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:22:13,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:22:13,846 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:22:13,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:22:13,847 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:22:13,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:22:13,847 INFO L82 PathProgramCache]: Analyzing trace with hash 769620075, now seen corresponding path program 1 times [2021-05-02 17:22:13,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:22:13,847 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923574042] [2021-05-02 17:22:13,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:22:13,859 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:22:13,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1773498041] [2021-05-02 17:22:13,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:22:13,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:22:13,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:22:13,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:22:13,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:22:13,994 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:22:13,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:22:13,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923574042] [2021-05-02 17:22:13,995 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:22:13,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773498041] [2021-05-02 17:22:13,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773498041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:22:13,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:22:13,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:22:13,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924540073] [2021-05-02 17:22:13,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:22:13,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:22:13,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:22:13,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:22:13,997 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:25:11,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:11,393 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 17:25:11,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:25:11,394 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-05-02 17:25:11,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:11,394 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:25:11,394 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:25:11,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:11,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:25:11,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 17:25:11,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:25:11,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 17:25:11,404 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 22 [2021-05-02 17:25:11,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:11,404 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 17:25:11,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:25:11,404 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 17:25:11,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:25:11,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:11,405 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:11,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:25:11,624 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:11,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:11,625 INFO L82 PathProgramCache]: Analyzing trace with hash 645812411, now seen corresponding path program 1 times [2021-05-02 17:25:11,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:11,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794818716] [2021-05-02 17:25:11,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:11,634 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:11,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1808760438] [2021-05-02 17:25:11,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:11,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:11,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:25:11,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:11,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:11,838 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:25:11,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:11,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794818716] [2021-05-02 17:25:11,838 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:11,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808760438] [2021-05-02 17:25:11,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808760438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:11,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:11,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:11,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365615176] [2021-05-02 17:25:11,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:11,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:11,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:11,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:11,840 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:25:11,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:11,912 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 17:25:11,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:25:11,913 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 17:25:11,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:11,913 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:25:11,913 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 17:25:11,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 39.0ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:11,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 17:25:11,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 17:25:11,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:25:11,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-05-02 17:25:11,920 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 29 [2021-05-02 17:25:11,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:11,921 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-05-02 17:25:11,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:25:11,921 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-05-02 17:25:11,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 17:25:11,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:11,922 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:12,137 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:12,138 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:12,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:12,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1415216747, now seen corresponding path program 2 times [2021-05-02 17:25:12,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:12,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47273517] [2021-05-02 17:25:12,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:12,158 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:12,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1104337066] [2021-05-02 17:25:12,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:12,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:25:12,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:12,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 17:25:12,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:12,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,405 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:25:12,405 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:12,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47273517] [2021-05-02 17:25:12,406 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:12,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104337066] [2021-05-02 17:25:12,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104337066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:12,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:12,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:25:12,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381744857] [2021-05-02 17:25:12,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:25:12,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:12,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:25:12,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:12,407 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:25:12,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:12,556 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 17:25:12,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:25:12,556 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 17:25:12,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:12,557 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:25:12,557 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:25:12,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.3ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:12,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:25:12,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:25:12,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:25:12,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-05-02 17:25:12,564 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 36 [2021-05-02 17:25:12,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:12,565 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-05-02 17:25:12,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:25:12,565 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-05-02 17:25:12,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 17:25:12,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:12,566 INFO L523 BasicCegarLoop]: trace histogram [4, 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] [2021-05-02 17:25:12,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:12,782 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:12,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash 463554397, now seen corresponding path program 1 times [2021-05-02 17:25:12,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:12,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669624277] [2021-05-02 17:25:12,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:12,796 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:12,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [843443308] [2021-05-02 17:25:12,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:12,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:12,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:25:12,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:12,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:12,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,043 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:25:13,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:13,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669624277] [2021-05-02 17:25:13,043 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:13,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843443308] [2021-05-02 17:25:13,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843443308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:13,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:13,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:25:13,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674519952] [2021-05-02 17:25:13,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:25:13,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:13,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:25:13,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:13,045 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:25:13,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:13,142 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-02 17:25:13,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:25:13,143 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 40 [2021-05-02 17:25:13,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:13,144 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:25:13,144 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:25:13,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 91.7ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:25:13,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:25:13,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:25:13,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:25:13,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:25:13,150 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 17:25:13,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:13,150 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:25:13,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:25:13,151 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:25:13,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:25:13,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:13,151 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:13,366 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:13,366 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:13,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:13,367 INFO L82 PathProgramCache]: Analyzing trace with hash 380668603, now seen corresponding path program 3 times [2021-05-02 17:25:13,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:13,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797765412] [2021-05-02 17:25:13,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:13,381 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:13,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1167993814] [2021-05-02 17:25:13,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:13,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:25:13,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:13,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:25:13,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:13,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:13,565 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 17:25:13,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:13,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797765412] [2021-05-02 17:25:13,565 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:13,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167993814] [2021-05-02 17:25:13,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167993814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:13,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:13,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:25:13,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709480982] [2021-05-02 17:25:13,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:25:13,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:13,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:25:13,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:25:13,566 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:25:38,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:38,099 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 17:25:38,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:25:38,099 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 43 [2021-05-02 17:25:38,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:38,100 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:25:38,100 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:25:38,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 21279.7ms TimeCoverageRelationStatistics Valid=23, Invalid=48, Unknown=1, NotChecked=0, Total=72 [2021-05-02 17:25:38,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:25:38,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-02 17:25:38,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:25:38,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 17:25:38,107 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 43 [2021-05-02 17:25:38,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:38,107 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 17:25:38,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:25:38,107 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 17:25:38,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:25:38,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:38,108 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:38,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:25:38,323 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:38,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:38,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1886956461, now seen corresponding path program 2 times [2021-05-02 17:25:38,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:38,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412538178] [2021-05-02 17:25:38,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:38,330 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:38,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [695582996] [2021-05-02 17:25:38,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:38,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:25:38,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:38,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 17:25:38,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:38,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:38,588 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:25:38,588 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:38,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412538178] [2021-05-02 17:25:38,588 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:38,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695582996] [2021-05-02 17:25:38,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695582996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:38,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:38,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:25:38,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669012488] [2021-05-02 17:25:38,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:25:38,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:38,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:25:38,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:38,589 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:25:38,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:38,679 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-02 17:25:38,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:25:38,679 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 47 [2021-05-02 17:25:38,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:38,680 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:25:38,680 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:25:38,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 73.4ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:25:38,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:25:38,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:25:38,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:25:38,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-02 17:25:38,688 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 47 [2021-05-02 17:25:38,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:38,688 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-02 17:25:38,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:25:38,688 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-02 17:25:38,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 17:25:38,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:38,689 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:38,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:38,905 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:38,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:38,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1213805219, now seen corresponding path program 3 times [2021-05-02 17:25:38,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:38,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411856447] [2021-05-02 17:25:38,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:38,911 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:38,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [218577962] [2021-05-02 17:25:38,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:39,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:25:39,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:39,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:25:39,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:39,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,425 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 9 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 17:25:39,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:39,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411856447] [2021-05-02 17:25:39,425 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:39,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218577962] [2021-05-02 17:25:39,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218577962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:39,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:39,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:25:39,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329745741] [2021-05-02 17:25:39,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:25:39,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:39,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:25:39,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:39,427 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:25:39,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:39,557 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-02 17:25:39,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:25:39,557 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 54 [2021-05-02 17:25:39,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:39,558 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:25:39,558 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:25:39,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 74.4ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:25:39,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:25:39,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 17:25:39,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 11 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:25:39,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 17:25:39,564 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 54 [2021-05-02 17:25:39,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:39,564 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 17:25:39,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:25:39,564 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 17:25:39,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:25:39,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:39,565 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:39,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:25:39,769 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:39,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:39,770 INFO L82 PathProgramCache]: Analyzing trace with hash 307258797, now seen corresponding path program 4 times [2021-05-02 17:25:39,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:39,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402565820] [2021-05-02 17:25:39,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:39,776 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:39,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [733203830] [2021-05-02 17:25:39,776 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:39,879 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:25:39,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:39,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:25:39,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:39,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:39,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:40,037 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:25:40,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:40,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402565820] [2021-05-02 17:25:40,038 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:40,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733203830] [2021-05-02 17:25:40,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733203830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:40,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:40,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:25:40,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926035943] [2021-05-02 17:25:40,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:25:40,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:40,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:25:40,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:40,039 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-05-02 17:25:40,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:40,113 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-02 17:25:40,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:25:40,114 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 61 [2021-05-02 17:25:40,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:40,114 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:25:40,114 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:25:40,114 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 66.1ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:25:40,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:25:40,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:25:40,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:25:40,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:25:40,120 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 61 [2021-05-02 17:25:40,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:40,121 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:25:40,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-05-02 17:25:40,121 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:25:40,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 17:25:40,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:40,121 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:40,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 17:25:40,337 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:40,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:40,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1082774365, now seen corresponding path program 5 times [2021-05-02 17:25:40,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:40,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681711232] [2021-05-02 17:25:40,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:40,344 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:40,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [458246759] [2021-05-02 17:25:40,344 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:40,833 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:25:40,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:40,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 17:25:40,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:40,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,693 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 61 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 17:25:42,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:42,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681711232] [2021-05-02 17:25:42,693 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:42,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458246759] [2021-05-02 17:25:42,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458246759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:42,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:42,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:25:42,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458216045] [2021-05-02 17:25:42,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:25:42,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:42,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:25:42,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:25:42,694 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:25:42,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:42,852 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-02 17:25:42,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:25:42,852 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 68 [2021-05-02 17:25:42,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:42,853 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:25:42,853 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 17:25:42,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1732.7ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:25:42,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 17:25:42,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 17:25:42,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 17:25:42,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-05-02 17:25:42,860 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 68 [2021-05-02 17:25:42,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:42,860 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-05-02 17:25:42,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:25:42,860 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-05-02 17:25:42,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:25:42,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:42,861 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:43,071 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:43,071 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:43,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:43,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1692754003, now seen corresponding path program 6 times [2021-05-02 17:25:43,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:43,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137514259] [2021-05-02 17:25:43,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:43,078 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:43,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [401595375] [2021-05-02 17:25:43,079 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true