/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/divbin_unwindbound20.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:37:45,517 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:37:45,519 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:37:45,549 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:37:45,563 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:37:45,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:37:45,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:37:45,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:37:45,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:37:45,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:37:45,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:37:45,574 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:37:45,575 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:37:45,576 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:37:45,577 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:37:45,578 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:37:45,583 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:37:45,590 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:37:45,591 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:37:45,591 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:37:45,594 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 14:37:45,649 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:37:45,649 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:37:45,651 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:37:45,651 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:37:45,651 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:37:45,651 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:37:45,651 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:37:45,652 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:37:45,652 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:37:45,652 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:37:45,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:37:45,653 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:37:45,654 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:37:45,654 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:37:45,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:37:45,655 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:37:45,655 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:37:45,655 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:37:45,910 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:37:45,939 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:37:45,941 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:37:45,942 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:37:45,942 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:37:45,943 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound20.i [2021-05-02 14:37:46,032 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cab22271/91155706f87c480e81d5456e48aa7433/FLAGf09100747 [2021-05-02 14:37:46,441 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:37:46,442 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound20.i [2021-05-02 14:37:46,446 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cab22271/91155706f87c480e81d5456e48aa7433/FLAGf09100747 [2021-05-02 14:37:46,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cab22271/91155706f87c480e81d5456e48aa7433 [2021-05-02 14:37:46,793 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:37:46,794 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:37:46,795 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:37:46,795 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:37:46,801 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:37:46,802 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:37:46" (1/1) ... [2021-05-02 14:37:46,802 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3420df73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:46, skipping insertion in model container [2021-05-02 14:37:46,802 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:37:46" (1/1) ... [2021-05-02 14:37:46,807 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:37:46,815 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:37:46,931 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/divbin_unwindbound20.i[958,971] [2021-05-02 14:37:46,954 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:37:46,959 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:37:47,000 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/divbin_unwindbound20.i[958,971] [2021-05-02 14:37:47,003 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:37:47,018 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:37:47,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47 WrapperNode [2021-05-02 14:37:47,019 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:37:47,020 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:37:47,020 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:37:47,021 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:37:47,027 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,027 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,032 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,032 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,050 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (1/1) ... [2021-05-02 14:37:47,052 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:37:47,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:37:47,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:37:47,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:37:47,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (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 14:37:47,155 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:37:47,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:37:47,156 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:37:47,156 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:37:47,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:37:47,156 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:37:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:37:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:37:47,343 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:37:47,344 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:37:47,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:37:47 BoogieIcfgContainer [2021-05-02 14:37:47,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:37:47,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:37:47,346 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:37:47,348 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:37:47,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:37:46" (1/3) ... [2021-05-02 14:37:47,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3301a3e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:37:47, skipping insertion in model container [2021-05-02 14:37:47,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:37:47" (2/3) ... [2021-05-02 14:37:47,349 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3301a3e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:37:47, skipping insertion in model container [2021-05-02 14:37:47,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:37:47" (3/3) ... [2021-05-02 14:37:47,350 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound20.i [2021-05-02 14:37:47,382 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:37:47,385 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:37:47,401 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:37:47,416 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:37:47,416 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:37:47,416 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:37:47,416 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:37:47,416 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:37:47,416 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:37:47,423 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:37:47,423 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:37:47,445 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:47,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 14:37:47,448 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:47,449 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:47,449 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:47,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:47,454 INFO L82 PathProgramCache]: Analyzing trace with hash 878397729, now seen corresponding path program 1 times [2021-05-02 14:37:47,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:47,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65871919] [2021-05-02 14:37:47,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:47,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:47,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:37:47,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:47,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:37:47,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:47,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:37:47,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:47,756 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 14:37:47,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:47,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65871919] [2021-05-02 14:37:47,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65871919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:37:47,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:37:47,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:37:47,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747128500] [2021-05-02 14:37:47,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:37:47,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:47,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:37:47,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:37:47,783 INFO L87 Difference]: Start difference. First operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:47,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:47,885 INFO L93 Difference]: Finished difference Result 60 states and 84 transitions. [2021-05-02 14:37:47,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:37:47,887 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 14:37:47,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:47,892 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:37:47,892 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 14:37:47,895 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:37:47,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 14:37:47,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 14:37:47,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:37:47,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 14:37:47,929 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 23 [2021-05-02 14:37:47,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:47,929 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 14:37:47,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:47,930 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 14:37:47,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 14:37:47,931 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:47,931 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:47,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:37:47,932 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:47,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:47,932 INFO L82 PathProgramCache]: Analyzing trace with hash 994169231, now seen corresponding path program 1 times [2021-05-02 14:37:47,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:47,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125424639] [2021-05-02 14:37:47,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:47,965 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:47,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [231157753] [2021-05-02 14:37:47,965 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 14:37:48,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:48,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:37:48,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:48,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,262 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 14:37:48,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:48,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125424639] [2021-05-02 14:37:48,263 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:48,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231157753] [2021-05-02 14:37:48,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231157753] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:37:48,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:37:48,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:37:48,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002588898] [2021-05-02 14:37:48,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:37:48,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:48,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:37:48,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:37:48,266 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:48,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:48,283 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2021-05-02 14:37:48,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:37:48,284 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-02 14:37:48,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:48,285 INFO L225 Difference]: With dead ends: 42 [2021-05-02 14:37:48,286 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 14:37:48,289 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:37:48,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 14:37:48,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 14:37:48,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:37:48,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 14:37:48,301 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2021-05-02 14:37:48,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:48,302 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 14:37:48,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:48,306 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 14:37:48,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:37:48,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:48,306 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:48,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:37:48,521 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:48,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:48,522 INFO L82 PathProgramCache]: Analyzing trace with hash 422434646, now seen corresponding path program 1 times [2021-05-02 14:37:48,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:48,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969307731] [2021-05-02 14:37:48,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:48,535 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:48,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1906339758] [2021-05-02 14:37:48,535 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 14:37:48,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:48,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:37:48,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:48,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:48,655 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 14:37:48,655 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:48,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969307731] [2021-05-02 14:37:48,655 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:48,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906339758] [2021-05-02 14:37:48,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906339758] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:37:48,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:37:48,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:37:48,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984345042] [2021-05-02 14:37:48,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:37:48,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:48,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:37:48,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:37:48,657 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:48,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:48,677 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-05-02 14:37:48,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:37:48,677 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:37:48,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:48,678 INFO L225 Difference]: With dead ends: 41 [2021-05-02 14:37:48,678 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:37:48,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.4ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:37:48,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:37:48,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 14:37:48,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:37:48,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-02 14:37:48,682 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 26 [2021-05-02 14:37:48,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:48,682 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-02 14:37:48,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:48,682 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-02 14:37:48,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:37:48,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:48,683 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:48,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:48,901 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:48,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:48,902 INFO L82 PathProgramCache]: Analyzing trace with hash 424222106, now seen corresponding path program 1 times [2021-05-02 14:37:48,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:48,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982537757] [2021-05-02 14:37:48,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:48,910 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:48,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1771968436] [2021-05-02 14:37:48,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:48,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:49,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 14:37:49,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:49,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,167 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 14:37:49,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:49,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982537757] [2021-05-02 14:37:49,168 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:49,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771968436] [2021-05-02 14:37:49,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771968436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:49,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:49,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:37:49,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089880146] [2021-05-02 14:37:49,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:37:49,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:49,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:37:49,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:37:49,169 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:49,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:49,290 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2021-05-02 14:37:49,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:37:49,291 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:37:49,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:49,292 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:37:49,292 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:37:49,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 88.4ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:37:49,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:37:49,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 14:37:49,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:37:49,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-05-02 14:37:49,298 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 26 [2021-05-02 14:37:49,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:49,298 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-05-02 14:37:49,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:49,299 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-05-02 14:37:49,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 14:37:49,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:49,300 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:49,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:49,513 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:49,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:49,514 INFO L82 PathProgramCache]: Analyzing trace with hash -193375877, now seen corresponding path program 1 times [2021-05-02 14:37:49,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:49,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308946482] [2021-05-02 14:37:49,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:49,524 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:49,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1829595489] [2021-05-02 14:37:49,524 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 14:37:49,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:49,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:37:49,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:49,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,632 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:49,632 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:49,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308946482] [2021-05-02 14:37:49,633 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:49,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829595489] [2021-05-02 14:37:49,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829595489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:49,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:49,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:37:49,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512466807] [2021-05-02 14:37:49,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:37:49,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:49,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:37:49,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:37:49,634 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:49,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:49,661 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-02 14:37:49,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:37:49,662 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 14:37:49,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:49,663 INFO L225 Difference]: With dead ends: 55 [2021-05-02 14:37:49,663 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 14:37:49,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:37:49,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 14:37:49,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 14:37:49,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:37:49,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 14:37:49,668 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 28 [2021-05-02 14:37:49,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:49,668 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 14:37:49,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:49,668 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 14:37:49,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:37:49,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:49,669 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:49,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:49,887 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:49,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:49,888 INFO L82 PathProgramCache]: Analyzing trace with hash -2031725334, now seen corresponding path program 1 times [2021-05-02 14:37:49,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:49,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97923025] [2021-05-02 14:37:49,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:49,898 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:49,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [166326826] [2021-05-02 14:37:49,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:49,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:49,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:37:49,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:49,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:49,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,011 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:50,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:50,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97923025] [2021-05-02 14:37:50,011 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:50,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166326826] [2021-05-02 14:37:50,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166326826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:50,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:50,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:37:50,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685910954] [2021-05-02 14:37:50,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:37:50,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:50,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:37:50,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:37:50,013 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:50,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:50,049 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-05-02 14:37:50,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:37:50,050 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:37:50,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:50,051 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:37:50,051 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:37:50,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.4ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:37:50,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:37:50,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-05-02 14:37:50,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:50,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 14:37:50,060 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 29 [2021-05-02 14:37:50,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:50,061 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 14:37:50,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:50,061 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 14:37:50,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:37:50,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:50,062 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:50,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:37:50,277 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:50,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:50,278 INFO L82 PathProgramCache]: Analyzing trace with hash -2029937874, now seen corresponding path program 1 times [2021-05-02 14:37:50,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:50,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912974926] [2021-05-02 14:37:50,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:50,286 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:50,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [360851456] [2021-05-02 14:37:50,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:50,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:50,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 14:37:50,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:50,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:50,536 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:50,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:50,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912974926] [2021-05-02 14:37:50,536 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:50,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360851456] [2021-05-02 14:37:50,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360851456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:50,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:50,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:37:50,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746061062] [2021-05-02 14:37:50,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:37:50,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:50,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:37:50,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:37:50,540 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:50,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:50,728 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-05-02 14:37:50,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:37:50,728 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:37:50,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:50,729 INFO L225 Difference]: With dead ends: 69 [2021-05-02 14:37:50,729 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:37:50,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 131.4ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:37:50,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:37:50,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 53. [2021-05-02 14:37:50,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 40 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:50,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 14:37:50,734 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 29 [2021-05-02 14:37:50,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:50,734 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 14:37:50,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:37:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 14:37:50,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 14:37:50,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:50,735 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:50,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:50,936 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:50,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:50,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1731935178, now seen corresponding path program 1 times [2021-05-02 14:37:50,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:50,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190629200] [2021-05-02 14:37:50,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:50,944 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:50,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2088863129] [2021-05-02 14:37:50,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:50,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:50,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 14:37:50,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:51,025 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:51,025 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:51,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190629200] [2021-05-02 14:37:51,025 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:51,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088863129] [2021-05-02 14:37:51,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088863129] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:37:51,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:37:51,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:37:51,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374880108] [2021-05-02 14:37:51,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:37:51,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:51,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:37:51,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:37:51,026 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:37:51,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:51,041 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 14:37:51,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:37:51,042 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-05-02 14:37:51,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:51,042 INFO L225 Difference]: With dead ends: 74 [2021-05-02 14:37:51,042 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:37:51,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:37:51,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:37:51,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:37:51,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:37:51,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-02 14:37:51,047 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-05-02 14:37:51,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:51,047 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-02 14:37:51,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:37:51,047 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-02 14:37:51,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:37:51,048 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:51,048 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:51,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:51,265 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:51,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:51,265 INFO L82 PathProgramCache]: Analyzing trace with hash 815990494, now seen corresponding path program 1 times [2021-05-02 14:37:51,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:51,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509634191] [2021-05-02 14:37:51,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:51,273 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:51,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1359372267] [2021-05-02 14:37:51,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:51,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:51,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:37:51,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:51,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,405 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:51,405 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:51,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509634191] [2021-05-02 14:37:51,406 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:51,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359372267] [2021-05-02 14:37:51,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359372267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:51,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:51,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:37:51,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697674027] [2021-05-02 14:37:51,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:37:51,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:51,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:37:51,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:37:51,408 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:51,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:51,443 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-02 14:37:51,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:37:51,443 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:37:51,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:51,444 INFO L225 Difference]: With dead ends: 67 [2021-05-02 14:37:51,444 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:37:51,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:37:51,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:37:51,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-05-02 14:37:51,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:51,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-05-02 14:37:51,455 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 38 [2021-05-02 14:37:51,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:51,455 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-05-02 14:37:51,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:51,455 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-05-02 14:37:51,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:37:51,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:51,459 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:51,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:37:51,676 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:51,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:51,676 INFO L82 PathProgramCache]: Analyzing trace with hash 817777954, now seen corresponding path program 1 times [2021-05-02 14:37:51,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:51,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840947402] [2021-05-02 14:37:51,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:51,684 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:51,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1414939638] [2021-05-02 14:37:51,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:37:51,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:51,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 14:37:51,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:51,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:51,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:52,730 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:52,730 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:52,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840947402] [2021-05-02 14:37:52,730 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:52,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414939638] [2021-05-02 14:37:52,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414939638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:52,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:52,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:37:52,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949126432] [2021-05-02 14:37:52,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:37:52,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:52,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:37:52,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:37:52,731 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:53,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:53,241 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2021-05-02 14:37:53,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:37:53,241 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:37:53,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:53,242 INFO L225 Difference]: With dead ends: 79 [2021-05-02 14:37:53,242 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 14:37:53,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 456.1ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:37:53,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 14:37:53,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-05-02 14:37:53,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:37:53,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-05-02 14:37:53,247 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 38 [2021-05-02 14:37:53,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:53,247 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-05-02 14:37:53,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:53,247 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-05-02 14:37:53,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 14:37:53,248 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:53,248 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:53,451 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:53,452 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:53,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:53,452 INFO L82 PathProgramCache]: Analyzing trace with hash 268409689, now seen corresponding path program 1 times [2021-05-02 14:37:53,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:53,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475107882] [2021-05-02 14:37:53,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:53,459 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:53,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [35805917] [2021-05-02 14:37:53,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-02 14:37:53,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:37:53,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:37:53,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:53,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:37:53,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:53,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475107882] [2021-05-02 14:37:53,634 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:53,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35805917] [2021-05-02 14:37:53,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35805917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:53,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:53,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:37:53,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040138128] [2021-05-02 14:37:53,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:37:53,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:53,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:37:53,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:37:53,635 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:53,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:53,673 INFO L93 Difference]: Finished difference Result 99 states and 116 transitions. [2021-05-02 14:37:53,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:37:53,674 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 40 [2021-05-02 14:37:53,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:53,675 INFO L225 Difference]: With dead ends: 99 [2021-05-02 14:37:53,675 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:37:53,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 22.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:37:53,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:37:53,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 14:37:53,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:37:53,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-05-02 14:37:53,680 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 40 [2021-05-02 14:37:53,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:53,680 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-05-02 14:37:53,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:53,680 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-05-02 14:37:53,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:37:53,681 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:53,681 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:53,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:53,899 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:53,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:53,899 INFO L82 PathProgramCache]: Analyzing trace with hash 829605357, now seen corresponding path program 2 times [2021-05-02 14:37:53,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:53,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552144837] [2021-05-02 14:37:53,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:53,920 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:53,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [27190679] [2021-05-02 14:37:53,920 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:53,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:37:53,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:53,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:37:53,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:53,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:53,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,064 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:37:54,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:54,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552144837] [2021-05-02 14:37:54,064 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:54,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27190679] [2021-05-02 14:37:54,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27190679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:54,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:54,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:37:54,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708506723] [2021-05-02 14:37:54,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:37:54,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:54,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:37:54,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:37:54,065 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:54,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:54,110 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 14:37:54,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:37:54,110 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 14:37:54,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:54,112 INFO L225 Difference]: With dead ends: 106 [2021-05-02 14:37:54,112 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:37:54,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:37:54,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:37:54,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 14:37:54,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:37:54,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:37:54,121 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 43 [2021-05-02 14:37:54,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:54,122 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:37:54,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:37:54,122 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:37:54,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:37:54,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:54,123 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:54,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:37:54,338 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:54,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:54,339 INFO L82 PathProgramCache]: Analyzing trace with hash -897932583, now seen corresponding path program 3 times [2021-05-02 14:37:54,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:54,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402559756] [2021-05-02 14:37:54,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:54,352 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:54,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1092653195] [2021-05-02 14:37:54,352 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:54,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:37:54,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:54,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:37:54,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:54,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,511 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 14:37:54,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:54,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402559756] [2021-05-02 14:37:54,512 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:54,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092653195] [2021-05-02 14:37:54,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092653195] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:37:54,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:37:54,512 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:37:54,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588217348] [2021-05-02 14:37:54,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:37:54,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:54,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:37:54,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:37:54,513 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 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 14:37:54,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:54,535 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2021-05-02 14:37:54,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:37:54,535 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 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 46 [2021-05-02 14:37:54,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:54,536 INFO L225 Difference]: With dead ends: 97 [2021-05-02 14:37:54,536 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 14:37:54,536 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.1ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:37:54,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 14:37:54,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2021-05-02 14:37:54,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 35 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:54,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-05-02 14:37:54,542 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 46 [2021-05-02 14:37:54,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:54,542 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-05-02 14:37:54,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 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 14:37:54,543 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-05-02 14:37:54,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:37:54,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:54,543 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:54,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:37:54,759 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:54,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:54,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1469925226, now seen corresponding path program 2 times [2021-05-02 14:37:54,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:54,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230531790] [2021-05-02 14:37:54,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:54,777 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:54,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [451762606] [2021-05-02 14:37:54,777 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:54,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:37:54,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:54,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:37:54,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:54,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:54,994 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:54,994 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:54,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230531790] [2021-05-02 14:37:54,994 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:54,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451762606] [2021-05-02 14:37:54,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451762606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:54,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:54,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:37:54,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397801673] [2021-05-02 14:37:54,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:37:54,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:54,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:37:54,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:37:54,995 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:55,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:55,050 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2021-05-02 14:37:55,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:37:55,050 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:37:55,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:55,051 INFO L225 Difference]: With dead ends: 98 [2021-05-02 14:37:55,051 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 14:37:55,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 30.7ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:37:55,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 14:37:55,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-05-02 14:37:55,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.169811320754717) internal successors, (62), 54 states have internal predecessors, (62), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:37:55,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2021-05-02 14:37:55,058 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 47 [2021-05-02 14:37:55,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:55,058 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2021-05-02 14:37:55,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:55,058 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2021-05-02 14:37:55,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:37:55,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:55,059 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:55,274 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:37:55,274 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:55,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:55,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1471712686, now seen corresponding path program 2 times [2021-05-02 14:37:55,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:55,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665187197] [2021-05-02 14:37:55,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:55,281 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:55,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1315749959] [2021-05-02 14:37:55,281 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:55,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:37:55,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:55,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 14:37:55,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:55,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:55,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:55,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:55,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:55,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:55,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:56,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:56,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:56,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:56,495 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:37:56,495 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:56,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665187197] [2021-05-02 14:37:56,495 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:56,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315749959] [2021-05-02 14:37:56,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315749959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:56,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:56,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:37:56,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155208394] [2021-05-02 14:37:56,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:37:56,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:56,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:37:56,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:37:56,496 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:56,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:56,739 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2021-05-02 14:37:56,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:37:56,739 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:37:56,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:56,740 INFO L225 Difference]: With dead ends: 100 [2021-05-02 14:37:56,740 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 14:37:56,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 335.6ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:37:56,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 14:37:56,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 14:37:56,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:37:56,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-02 14:37:56,743 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 47 [2021-05-02 14:37:56,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:56,743 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-02 14:37:56,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:56,743 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-02 14:37:56,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:37:56,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:56,744 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:56,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:56,948 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:56,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:56,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1045745238, now seen corresponding path program 3 times [2021-05-02 14:37:56,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:56,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455901866] [2021-05-02 14:37:56,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:56,957 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:56,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1612070895] [2021-05-02 14:37:56,957 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:57,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:37:57,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:57,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:37:57,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:57,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:37:57,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:57,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455901866] [2021-05-02 14:37:57,191 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:57,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612070895] [2021-05-02 14:37:57,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612070895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:57,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:57,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:37:57,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484092918] [2021-05-02 14:37:57,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:37:57,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:57,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:37:57,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:37:57,193 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:57,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:57,246 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2021-05-02 14:37:57,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:37:57,247 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 50 [2021-05-02 14:37:57,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:57,249 INFO L225 Difference]: With dead ends: 101 [2021-05-02 14:37:57,249 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 14:37:57,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 54.5ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:37:57,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 14:37:57,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 74. [2021-05-02 14:37:57,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 57 states have internal predecessors, (65), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:37:57,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 83 transitions. [2021-05-02 14:37:57,254 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 83 transitions. Word has length 50 [2021-05-02 14:37:57,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:57,254 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 83 transitions. [2021-05-02 14:37:57,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:37:57,254 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 83 transitions. [2021-05-02 14:37:57,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:37:57,254 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:57,254 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:57,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 14:37:57,458 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:57,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:57,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1047532698, now seen corresponding path program 3 times [2021-05-02 14:37:57,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:57,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927823907] [2021-05-02 14:37:57,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:57,471 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:57,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2144038222] [2021-05-02 14:37:57,471 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true