/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/divbin2_unwindbound100.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 01:58:23,040 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 01:58:23,041 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 01:58:23,067 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 01:58:23,078 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 01:58:23,079 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 01:58:23,079 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 01:58:23,080 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 01:58:23,081 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 01:58:23,081 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 01:58:23,082 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 01:58:23,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 01:58:23,084 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 01:58:23,085 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 01:58:23,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 01:58:23,086 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 01:58:23,087 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 01:58:23,092 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 01:58:23,092 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 01:58:23,093 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 01:58:23,093 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 [2021-05-06 01:58:23,107 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 01:58:23,108 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 01:58:23,109 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 01:58:23,109 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 01:58:23,109 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 01:58:23,109 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 01:58:23,109 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 01:58:23,109 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 01:58:23,109 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 01:58:23,110 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 01:58:23,111 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 01:58:23,111 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 01:58:23,111 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 01:58:23,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 01:58:23,112 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 01:58:23,112 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 01:58:23,112 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 01:58:23,356 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 01:58:23,376 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 01:58:23,378 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 01:58:23,379 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 01:58:23,379 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 01:58:23,380 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound100.i [2021-05-06 01:58:23,438 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ca18aa6a/13fa4d9e88b443d39ed1af7f85252d6d/FLAG3e449f0a3 [2021-05-06 01:58:23,815 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 01:58:23,816 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound100.i [2021-05-06 01:58:23,820 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ca18aa6a/13fa4d9e88b443d39ed1af7f85252d6d/FLAG3e449f0a3 [2021-05-06 01:58:23,833 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ca18aa6a/13fa4d9e88b443d39ed1af7f85252d6d [2021-05-06 01:58:23,836 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 01:58:23,837 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 01:58:23,839 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 01:58:23,839 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 01:58:23,841 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 01:58:23,842 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:58:23" (1/1) ... [2021-05-06 01:58:23,842 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72bdcdce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:23, skipping insertion in model container [2021-05-06 01:58:23,842 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:58:23" (1/1) ... [2021-05-06 01:58:23,847 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 01:58:23,859 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 01:58:23,975 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/divbin2_unwindbound100.i[959,972] [2021-05-06 01:58:23,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:58:23,992 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 01:58:24,003 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/divbin2_unwindbound100.i[959,972] [2021-05-06 01:58:24,014 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:58:24,025 INFO L208 MainTranslator]: Completed translation [2021-05-06 01:58:24,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24 WrapperNode [2021-05-06 01:58:24,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 01:58:24,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 01:58:24,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 01:58:24,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 01:58:24,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,051 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,051 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,073 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,076 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (1/1) ... [2021-05-06 01:58:24,079 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 01:58:24,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 01:58:24,080 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 01:58:24,080 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 01:58:24,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (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 [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 01:58:24,146 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 01:58:24,146 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 01:58:24,147 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 01:58:24,147 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 01:58:24,147 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 01:58:24,147 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 01:58:24,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 01:58:24,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 01:58:24,148 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 01:58:24,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 01:58:24,148 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 01:58:24,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 01:58:24,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 01:58:24,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 01:58:24,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 01:58:24,149 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 01:58:24,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 01:58:24,336 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 01:58:24,336 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 01:58:24,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:58:24 BoogieIcfgContainer [2021-05-06 01:58:24,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 01:58:24,338 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 01:58:24,338 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 01:58:24,340 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 01:58:24,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 01:58:23" (1/3) ... [2021-05-06 01:58:24,340 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60c39e80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:58:24, skipping insertion in model container [2021-05-06 01:58:24,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:58:24" (2/3) ... [2021-05-06 01:58:24,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60c39e80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:58:24, skipping insertion in model container [2021-05-06 01:58:24,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:58:24" (3/3) ... [2021-05-06 01:58:24,341 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound100.i [2021-05-06 01:58:24,345 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 01:58:24,347 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 01:58:24,356 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 01:58:24,379 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 01:58:24,379 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 01:58:24,379 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 01:58:24,379 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 01:58:24,379 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 01:58:24,380 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 01:58:24,380 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 01:58:24,380 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 01:58:24,414 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 01:58:24,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 01:58:24,417 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:24,417 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:24,418 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:24,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:24,421 INFO L82 PathProgramCache]: Analyzing trace with hash -2126508982, now seen corresponding path program 1 times [2021-05-06 01:58:24,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:24,426 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132439360] [2021-05-06 01:58:24,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:24,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:24,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 01:58:24,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:24,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:24,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:24,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132439360] [2021-05-06 01:58:24,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132439360] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:58:24,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:58:24,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 01:58:24,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84763338] [2021-05-06 01:58:24,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 01:58:24,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:24,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 01:58:24,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:58:24,560 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:24,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:24,618 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2021-05-06 01:58:24,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 01:58:24,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 01:58:24,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:24,625 INFO L225 Difference]: With dead ends: 44 [2021-05-06 01:58:24,625 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 01:58:24,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:58:24,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 01:58:24,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-06 01:58:24,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:24,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-06 01:58:24,655 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-06 01:58:24,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:24,655 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-06 01:58:24,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:24,656 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-06 01:58:24,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 01:58:24,656 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:24,656 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:24,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 01:58:24,657 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:24,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:24,657 INFO L82 PathProgramCache]: Analyzing trace with hash 941422680, now seen corresponding path program 1 times [2021-05-06 01:58:24,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:24,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875645811] [2021-05-06 01:58:24,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:24,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:24,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 01:58:24,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:24,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:24,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875645811] [2021-05-06 01:58:24,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875645811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:58:24,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:58:24,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 01:58:24,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054420844] [2021-05-06 01:58:24,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 01:58:24,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:24,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 01:58:24,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:58:24,749 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:24,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:24,847 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2021-05-06 01:58:24,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 01:58:24,848 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 01:58:24,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:24,850 INFO L225 Difference]: With dead ends: 35 [2021-05-06 01:58:24,850 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 01:58:24,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:58:24,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 01:58:24,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 01:58:24,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:24,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-06 01:58:24,857 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-06 01:58:24,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:24,858 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-06 01:58:24,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:24,859 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-06 01:58:24,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 01:58:24,859 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:24,859 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:24,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 01:58:24,861 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:24,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:24,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1209133518, now seen corresponding path program 1 times [2021-05-06 01:58:24,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:24,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644445158] [2021-05-06 01:58:24,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:24,888 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:24,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [814973361] [2021-05-06 01:58:24,892 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 [2021-05-06 01:58:24,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:24,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 01:58:24,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:24,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:25,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:25,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644445158] [2021-05-06 01:58:25,068 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:25,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814973361] [2021-05-06 01:58:25,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814973361] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:58:25,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:58:25,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 01:58:25,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542290756] [2021-05-06 01:58:25,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 01:58:25,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:25,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 01:58:25,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:58:25,069 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:25,085 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-06 01:58:25,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 01:58:25,085 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 01:58:25,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:25,086 INFO L225 Difference]: With dead ends: 34 [2021-05-06 01:58:25,086 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 01:58:25,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.0ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:58:25,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 01:58:25,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 01:58:25,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:25,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-06 01:58:25,091 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-06 01:58:25,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:25,091 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-06 01:58:25,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,091 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-06 01:58:25,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 01:58:25,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:25,092 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:25,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 01:58:25,309 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:25,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:25,309 INFO L82 PathProgramCache]: Analyzing trace with hash -1207346058, now seen corresponding path program 1 times [2021-05-06 01:58:25,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:25,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972929] [2021-05-06 01:58:25,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:25,319 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:25,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1484069429] [2021-05-06 01:58:25,319 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 [2021-05-06 01:58:25,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:25,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 01:58:25,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:25,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:25,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:25,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972929] [2021-05-06 01:58:25,462 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:25,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484069429] [2021-05-06 01:58:25,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484069429] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:58:25,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:58:25,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 01:58:25,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397664531] [2021-05-06 01:58:25,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 01:58:25,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:25,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 01:58:25,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:58:25,464 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:25,503 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-06 01:58:25,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 01:58:25,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 01:58:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:25,504 INFO L225 Difference]: With dead ends: 35 [2021-05-06 01:58:25,504 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 01:58:25,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 26.4ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:58:25,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 01:58:25,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 01:58:25,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 01:58:25,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-06 01:58:25,508 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-06 01:58:25,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:25,508 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-06 01:58:25,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,508 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-06 01:58:25,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 01:58:25,509 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:25,509 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:25,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:58:25,717 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:25,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:25,717 INFO L82 PathProgramCache]: Analyzing trace with hash -352921097, now seen corresponding path program 1 times [2021-05-06 01:58:25,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:25,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551841561] [2021-05-06 01:58:25,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:25,738 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:25,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1306642647] [2021-05-06 01:58:25,738 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 [2021-05-06 01:58:25,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:25,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 01:58:25,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:25,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:25,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:25,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:25,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551841561] [2021-05-06 01:58:25,853 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:25,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306642647] [2021-05-06 01:58:25,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306642647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 01:58:25,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 01:58:25,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 01:58:25,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505105640] [2021-05-06 01:58:25,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 01:58:25,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:25,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 01:58:25,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:58:25,854 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:25,880 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-05-06 01:58:25,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 01:58:25,881 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 01:58:25,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:25,881 INFO L225 Difference]: With dead ends: 46 [2021-05-06 01:58:25,881 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 01:58:25,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:58:25,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 01:58:25,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 01:58:25,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 01:58:25,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-06 01:58:25,885 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-06 01:58:25,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:25,885 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-06 01:58:25,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:25,885 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-06 01:58:25,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 01:58:25,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:25,886 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:26,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:58:26,087 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:26,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:26,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1615882355, now seen corresponding path program 1 times [2021-05-06 01:58:26,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:26,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383936362] [2021-05-06 01:58:26,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:26,094 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:26,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [756579383] [2021-05-06 01:58:26,095 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 [2021-05-06 01:58:26,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:26,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 01:58:26,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:26,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:26,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:26,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383936362] [2021-05-06 01:58:26,192 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:26,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756579383] [2021-05-06 01:58:26,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756579383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 01:58:26,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 01:58:26,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 01:58:26,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069134688] [2021-05-06 01:58:26,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 01:58:26,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:26,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 01:58:26,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:58:26,193 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:26,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:26,241 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2021-05-06 01:58:26,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 01:58:26,241 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-06 01:58:26,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:26,242 INFO L225 Difference]: With dead ends: 46 [2021-05-06 01:58:26,242 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 01:58:26,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:58:26,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 01:58:26,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-06 01:58:26,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 01:58:26,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-06 01:58:26,246 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-06 01:58:26,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:26,246 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-06 01:58:26,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:26,246 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-06 01:58:26,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 01:58:26,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:26,247 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:26,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:58:26,461 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:26,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:26,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1617669815, now seen corresponding path program 1 times [2021-05-06 01:58:26,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:26,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180712130] [2021-05-06 01:58:26,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:26,469 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:26,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [527123734] [2021-05-06 01:58:26,469 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 [2021-05-06 01:58:26,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:26,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 01:58:26,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:26,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:26,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:26,633 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:26,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180712130] [2021-05-06 01:58:26,634 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:26,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527123734] [2021-05-06 01:58:26,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527123734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 01:58:26,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 01:58:26,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 01:58:26,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690579723] [2021-05-06 01:58:26,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 01:58:26,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:26,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 01:58:26,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:58:26,635 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:26,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:26,719 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2021-05-06 01:58:26,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 01:58:26,719 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-06 01:58:26,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:26,720 INFO L225 Difference]: With dead ends: 52 [2021-05-06 01:58:26,720 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 01:58:26,720 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:58:26,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 01:58:26,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-06 01:58:26,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 01:58:26,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-06 01:58:26,724 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-06 01:58:26,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:26,725 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-06 01:58:26,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 01:58:26,725 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-06 01:58:26,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 01:58:26,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:26,725 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] [2021-05-06 01:58:26,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 01:58:26,937 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:26,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:26,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1627795671, now seen corresponding path program 1 times [2021-05-06 01:58:26,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:26,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259170171] [2021-05-06 01:58:26,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:26,951 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:26,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301161126] [2021-05-06 01:58:26,951 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 [2021-05-06 01:58:27,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:27,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 01:58:27,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:27,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:27,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:27,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259170171] [2021-05-06 01:58:27,050 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:27,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301161126] [2021-05-06 01:58:27,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301161126] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:58:27,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:58:27,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 01:58:27,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984540266] [2021-05-06 01:58:27,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 01:58:27,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:27,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 01:58:27,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:58:27,051 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:27,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:27,062 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-06 01:58:27,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 01:58:27,062 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-06 01:58:27,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:27,063 INFO L225 Difference]: With dead ends: 58 [2021-05-06 01:58:27,063 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 01:58:27,063 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:58:27,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 01:58:27,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 01:58:27,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 01:58:27,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-06 01:58:27,079 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-06 01:58:27,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:27,079 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-06 01:58:27,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:27,079 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-06 01:58:27,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 01:58:27,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:27,080 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] [2021-05-06 01:58:27,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:58:27,280 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:27,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:27,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1817538190, now seen corresponding path program 1 times [2021-05-06 01:58:27,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:27,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701455955] [2021-05-06 01:58:27,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:27,287 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:27,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1685268580] [2021-05-06 01:58:27,288 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 [2021-05-06 01:58:27,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:58:27,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 01:58:27,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:58:27,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:58:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:58:27,471 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:58:27,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701455955] [2021-05-06 01:58:27,471 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:58:27,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685268580] [2021-05-06 01:58:27,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685268580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 01:58:27,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 01:58:27,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 01:58:27,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101280506] [2021-05-06 01:58:27,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 01:58:27,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:58:27,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 01:58:27,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:58:27,475 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:27,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:58:27,510 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-05-06 01:58:27,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 01:58:27,511 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-06 01:58:27,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:58:27,511 INFO L225 Difference]: With dead ends: 60 [2021-05-06 01:58:27,511 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 01:58:27,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 21.3ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 01:58:27,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 01:58:27,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-06 01:58:27,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 01:58:27,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-06 01:58:27,527 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-06 01:58:27,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:58:27,528 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-06 01:58:27,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:58:27,529 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-06 01:58:27,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 01:58:27,530 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:58:27,531 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:58:27,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:58:27,745 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:58:27,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:58:27,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1815750730, now seen corresponding path program 1 times [2021-05-06 01:58:27,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:58:27,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733272865] [2021-05-06 01:58:27,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:58:27,752 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:58:27,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [395936194] [2021-05-06 01:58:27,752 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