/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/hard-u_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:30:29,889 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:30:29,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:30:29,908 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:30:29,914 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:30:29,914 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:30:29,915 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:30:29,916 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:30:29,916 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:30:29,917 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:30:29,918 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:30:29,919 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:30:29,920 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:30:29,920 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:30:29,921 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:30:29,921 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:30:29,923 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:30:29,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:30:29,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:30:29,929 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:30:29,934 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 15:30:29,948 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:30:29,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:30:29,949 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:30:29,950 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:30:29,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:30:29,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:30:29,951 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:30:29,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:30:29,952 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:30:29,953 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:30:29,966 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:30:30,168 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:30:30,183 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:30:30,185 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:30:30,186 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:30:30,187 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:30:30,187 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound20.c [2021-05-02 15:30:30,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0136f5443/e6f4d45569564defbae092d0f2d5fdab/FLAGdb8e64d0a [2021-05-02 15:30:30,570 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:30:30,570 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound20.c [2021-05-02 15:30:30,575 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0136f5443/e6f4d45569564defbae092d0f2d5fdab/FLAGdb8e64d0a [2021-05-02 15:30:30,592 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0136f5443/e6f4d45569564defbae092d0f2d5fdab [2021-05-02 15:30:30,595 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:30:30,597 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:30:30,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:30,599 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:30:30,602 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:30:30,603 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,603 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14858afd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30, skipping insertion in model container [2021-05-02 15:30:30,603 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,608 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:30:30,619 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:30:30,736 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/hard-u_unwindbound20.c[545,558] [2021-05-02 15:30:30,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:30,764 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:30:30,773 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/hard-u_unwindbound20.c[545,558] [2021-05-02 15:30:30,784 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:30,796 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:30:30,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30 WrapperNode [2021-05-02 15:30:30,796 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:30,802 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:30:30,802 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:30:30,803 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:30:30,817 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,827 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,828 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,852 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,856 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,862 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (1/1) ... [2021-05-02 15:30:30,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:30:30,864 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:30:30,864 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:30:30,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:30:30,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (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 15:30:30,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:30:30,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:30:30,931 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:30:30,931 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:30:30,931 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:30:30,932 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 15:30:30,932 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:30:30,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:30:30,933 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:30:30,933 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:30:30,934 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:30:30,934 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:30:30,934 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:30:30,934 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:30:30,934 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:30:31,166 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:30:31,166 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 15:30:31,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:31 BoogieIcfgContainer [2021-05-02 15:30:31,167 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:30:31,168 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:30:31,168 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:30:31,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:30:31,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:30:30" (1/3) ... [2021-05-02 15:30:31,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fdeeb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:31, skipping insertion in model container [2021-05-02 15:30:31,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:30" (2/3) ... [2021-05-02 15:30:31,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fdeeb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:31, skipping insertion in model container [2021-05-02 15:30:31,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:31" (3/3) ... [2021-05-02 15:30:31,172 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound20.c [2021-05-02 15:30:31,193 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:30:31,195 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:30:31,206 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:30:31,221 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:30:31,221 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:30:31,221 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:30:31,221 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:30:31,221 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:30:31,221 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:30:31,221 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:30:31,221 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:30:31,231 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 15:30:31,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:31,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:31,234 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:31,235 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:31,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:31,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2021-05-02 15:30:31,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:31,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117395161] [2021-05-02 15:30:31,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:31,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:31,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:31,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:31,457 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:31,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117395161] [2021-05-02 15:30:31,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117395161] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:31,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:31,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:30:31,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427804731] [2021-05-02 15:30:31,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:30:31,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:31,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:30:31,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:31,470 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:31,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:31,556 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2021-05-02 15:30:31,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:30:31,557 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:31,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:31,564 INFO L225 Difference]: With dead ends: 66 [2021-05-02 15:30:31,564 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 15:30:31,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:31,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 15:30:31,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 15:30:31,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:31,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 15:30:31,615 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-02 15:30:31,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:31,615 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 15:30:31,616 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:31,616 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 15:30:31,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:31,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:31,616 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:31,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:30:31,617 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:31,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:31,617 INFO L82 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2021-05-02 15:30:31,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:31,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375479388] [2021-05-02 15:30:31,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:31,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:31,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:31,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:31,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:31,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375479388] [2021-05-02 15:30:31,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375479388] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:31,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:31,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:31,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409968342] [2021-05-02 15:30:31,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:31,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:31,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:31,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:31,711 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:31,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:31,946 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-02 15:30:31,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:31,947 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:31,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:31,947 INFO L225 Difference]: With dead ends: 47 [2021-05-02 15:30:31,948 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:30:31,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 145.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:31,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:30:31,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-02 15:30:31,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:31,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 15:30:31,957 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-02 15:30:31,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:31,957 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 15:30:31,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:31,958 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 15:30:31,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 15:30:31,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:31,958 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:31,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 15:30:31,958 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:31,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:31,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2021-05-02 15:30:31,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:31,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305582916] [2021-05-02 15:30:31,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:31,977 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:31,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [848399963] [2021-05-02 15:30:31,978 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 15:30:32,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:30:32,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:32,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:32,179 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:32,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305582916] [2021-05-02 15:30:32,179 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:32,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848399963] [2021-05-02 15:30:32,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848399963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:32,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:32,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:30:32,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026617862] [2021-05-02 15:30:32,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:30:32,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:32,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:30:32,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:32,183 INFO L87 Difference]: Start difference. First operand 36 states and 45 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:32,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:32,206 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2021-05-02 15:30:32,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:30:32,206 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 15:30:32,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:32,208 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:32,208 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 15:30:32,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:32,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 15:30:32,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 15:30:32,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:32,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-02 15:30:32,229 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-02 15:30:32,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:32,229 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-02 15:30:32,230 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:32,230 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-02 15:30:32,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:30:32,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:32,232 INFO L523 BasicCegarLoop]: trace histogram [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 15:30:32,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 15:30:32,433 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:32,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:32,434 INFO L82 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2021-05-02 15:30:32,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:32,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822670061] [2021-05-02 15:30:32,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:32,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:32,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:32,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-02 15:30:32,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:32,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:32,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822670061] [2021-05-02 15:30:32,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822670061] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:32,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:32,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:32,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29524518] [2021-05-02 15:30:32,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:32,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:32,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:32,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:32,589 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:32,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:32,802 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2021-05-02 15:30:32,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:32,802 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:30:32,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:32,805 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:32,805 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 15:30:32,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 116.4ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:32,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 15:30:32,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-02 15:30:32,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:32,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 15:30:32,816 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-02 15:30:32,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:32,816 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 15:30:32,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:32,817 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 15:30:32,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 15:30:32,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:32,818 INFO L523 BasicCegarLoop]: trace histogram [3, 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 15:30:32,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 15:30:32,818 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:32,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:32,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2021-05-02 15:30:32,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:32,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538732848] [2021-05-02 15:30:32,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:32,840 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:32,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1742048815] [2021-05-02 15:30:32,841 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 15:30:32,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:30:32,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:32,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:30:33,019 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:33,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538732848] [2021-05-02 15:30:33,020 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:33,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742048815] [2021-05-02 15:30:33,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742048815] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:33,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:33,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 15:30:33,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9263124] [2021-05-02 15:30:33,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:30:33,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:33,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:30:33,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:33,021 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:33,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:33,113 INFO L93 Difference]: Finished difference Result 71 states and 93 transitions. [2021-05-02 15:30:33,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:33,114 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-02 15:30:33,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:33,121 INFO L225 Difference]: With dead ends: 71 [2021-05-02 15:30:33,121 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 15:30:33,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 34.2ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:33,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 15:30:33,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 15:30:33,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:30:33,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-02 15:30:33,135 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 28 [2021-05-02 15:30:33,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:33,135 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-02 15:30:33,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:33,135 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-02 15:30:33,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:30:33,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:33,136 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:33,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:33,353 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:33,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:33,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2021-05-02 15:30:33,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:33,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696095229] [2021-05-02 15:30:33,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:33,367 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:33,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [954671135] [2021-05-02 15:30:33,367 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 15:30:33,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:33,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:30:33,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:33,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,544 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:33,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:33,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696095229] [2021-05-02 15:30:33,545 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:33,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954671135] [2021-05-02 15:30:33,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954671135] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:33,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:33,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 15:30:33,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796527060] [2021-05-02 15:30:33,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:30:33,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:33,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:30:33,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:33,546 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:33,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:33,571 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-05-02 15:30:33,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:30:33,572 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 15:30:33,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:33,572 INFO L225 Difference]: With dead ends: 76 [2021-05-02 15:30:33,572 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 15:30:33,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.5ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:33,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 15:30:33,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 15:30:33,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 44 states have internal predecessors, (49), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:30:33,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-05-02 15:30:33,578 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 36 [2021-05-02 15:30:33,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:33,578 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-05-02 15:30:33,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:33,579 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-05-02 15:30:33,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:30:33,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:33,579 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:33,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:33,780 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:33,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:33,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1303085071, now seen corresponding path program 1 times [2021-05-02 15:30:33,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:33,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085353850] [2021-05-02 15:30:33,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:33,787 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:33,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1602881539] [2021-05-02 15:30:33,787 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 15:30:33,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:33,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:33,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:33,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,966 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:33,966 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:33,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085353850] [2021-05-02 15:30:33,967 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:33,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602881539] [2021-05-02 15:30:33,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602881539] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:33,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:33,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 15:30:33,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554592224] [2021-05-02 15:30:33,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:33,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:33,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:33,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:33,968 INFO L87 Difference]: Start difference. First operand 68 states and 78 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:34,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:34,099 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2021-05-02 15:30:34,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:34,100 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 15:30:34,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:34,102 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:30:34,102 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 15:30:34,103 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 62.1ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:30:34,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 15:30:34,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 15:30:34,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:30:34,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 15:30:34,113 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 36 [2021-05-02 15:30:34,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:34,113 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 15:30:34,113 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:34,113 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 15:30:34,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 15:30:34,119 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:34,119 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:34,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:34,334 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:34,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:34,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1189074514, now seen corresponding path program 1 times [2021-05-02 15:30:34,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:34,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764224327] [2021-05-02 15:30:34,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:34,341 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:34,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [888902687] [2021-05-02 15:30:34,341 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 15:30:34,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:34,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:30:34,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:34,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,444 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:34,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:34,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764224327] [2021-05-02 15:30:34,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:34,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888902687] [2021-05-02 15:30:34,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888902687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:34,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:34,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:30:34,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975585921] [2021-05-02 15:30:34,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:30:34,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:34,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:30:34,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:34,448 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:34,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:34,477 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2021-05-02 15:30:34,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:30:34,477 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-05-02 15:30:34,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:34,478 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:30:34,478 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 15:30:34,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.9ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:34,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 15:30:34,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 15:30:34,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:30:34,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-02 15:30:34,486 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 38 [2021-05-02 15:30:34,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:34,487 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-02 15:30:34,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:34,487 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-02 15:30:34,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 15:30:34,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:34,487 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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 15:30:34,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:34,697 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:34,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:34,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890039, now seen corresponding path program 1 times [2021-05-02 15:30:34,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:34,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389201267] [2021-05-02 15:30:34,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:34,703 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:34,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2106599169] [2021-05-02 15:30:34,704 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 15:30:34,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:34,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:30:34,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:34,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:34,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 15:30:35,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:35,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389201267] [2021-05-02 15:30:35,021 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:35,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106599169] [2021-05-02 15:30:35,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106599169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:35,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:35,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:30:35,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075104570] [2021-05-02 15:30:35,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:35,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:35,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:35,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:35,023 INFO L87 Difference]: Start difference. First operand 60 states and 68 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:30:35,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:35,170 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2021-05-02 15:30:35,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:35,171 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-02 15:30:35,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:35,171 INFO L225 Difference]: With dead ends: 83 [2021-05-02 15:30:35,171 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 15:30:35,172 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 43.1ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:30:35,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 15:30:35,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2021-05-02 15:30:35,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 46 states have internal predecessors, (53), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:30:35,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-05-02 15:30:35,177 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 46 [2021-05-02 15:30:35,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:35,177 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-05-02 15:30:35,177 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:30:35,177 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-05-02 15:30:35,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:30:35,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:35,178 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 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] [2021-05-02 15:30:35,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:35,387 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:35,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:35,388 INFO L82 PathProgramCache]: Analyzing trace with hash 243046571, now seen corresponding path program 1 times [2021-05-02 15:30:35,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:35,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784941540] [2021-05-02 15:30:35,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:35,401 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:35,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1725265035] [2021-05-02 15:30:35,401 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 15:30:35,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:35,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:30:35,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:35,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,550 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 15:30:35,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:35,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784941540] [2021-05-02 15:30:35,550 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:35,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725265035] [2021-05-02 15:30:35,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725265035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:35,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:35,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:30:35,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476064171] [2021-05-02 15:30:35,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:35,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:35,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:35,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:35,551 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:30:35,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:35,589 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2021-05-02 15:30:35,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:30:35,589 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 54 [2021-05-02 15:30:35,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:35,591 INFO L225 Difference]: With dead ends: 94 [2021-05-02 15:30:35,591 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 15:30:35,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.2ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:35,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 15:30:35,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 15:30:35,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 55 states have internal predecessors, (61), 18 states have call successors, (18), 13 states have call predecessors, (18), 12 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:30:35,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2021-05-02 15:30:35,603 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 54 [2021-05-02 15:30:35,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:35,603 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2021-05-02 15:30:35,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:30:35,603 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2021-05-02 15:30:35,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:30:35,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:35,605 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 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] [2021-05-02 15:30:35,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 15:30:35,813 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:35,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:35,813 INFO L82 PathProgramCache]: Analyzing trace with hash 244774449, now seen corresponding path program 1 times [2021-05-02 15:30:35,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:35,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116428915] [2021-05-02 15:30:35,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:35,827 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:35,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [69850066] [2021-05-02 15:30:35,828 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 15:30:35,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:35,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:35,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:35,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:35,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,105 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 15:30:36,105 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:36,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116428915] [2021-05-02 15:30:36,105 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:36,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69850066] [2021-05-02 15:30:36,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69850066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:36,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:36,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:30:36,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656126522] [2021-05-02 15:30:36,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:36,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:36,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:36,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:36,108 INFO L87 Difference]: Start difference. First operand 85 states and 95 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:30:36,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:36,214 INFO L93 Difference]: Finished difference Result 99 states and 114 transitions. [2021-05-02 15:30:36,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:36,215 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2021-05-02 15:30:36,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:36,218 INFO L225 Difference]: With dead ends: 99 [2021-05-02 15:30:36,218 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 15:30:36,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 54.8ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:30:36,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 15:30:36,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-05-02 15:30:36,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 63 states have internal predecessors, (71), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:30:36,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 111 transitions. [2021-05-02 15:30:36,225 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 111 transitions. Word has length 54 [2021-05-02 15:30:36,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:36,227 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 111 transitions. [2021-05-02 15:30:36,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:30:36,227 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 111 transitions. [2021-05-02 15:30:36,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 15:30:36,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:36,229 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:36,435 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:30:36,435 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:36,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:36,435 INFO L82 PathProgramCache]: Analyzing trace with hash 940283669, now seen corresponding path program 1 times [2021-05-02 15:30:36,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:36,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502269533] [2021-05-02 15:30:36,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:36,446 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:36,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [481114458] [2021-05-02 15:30:36,446 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 15:30:36,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:36,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:30:36,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:36,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:36,590 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 15:30:36,590 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:36,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502269533] [2021-05-02 15:30:36,590 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:36,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481114458] [2021-05-02 15:30:36,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481114458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:36,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:36,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:30:36,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698807458] [2021-05-02 15:30:36,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:36,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:36,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:36,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:36,591 INFO L87 Difference]: Start difference. First operand 96 states and 111 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:30:36,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:36,636 INFO L93 Difference]: Finished difference Result 123 states and 149 transitions. [2021-05-02 15:30:36,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:36,636 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 61 [2021-05-02 15:30:36,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:36,638 INFO L225 Difference]: With dead ends: 123 [2021-05-02 15:30:36,638 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 15:30:36,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 25.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:36,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 15:30:36,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-02 15:30:36,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 65 states have internal predecessors, (73), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:30:36,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2021-05-02 15:30:36,650 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 61 [2021-05-02 15:30:36,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:36,650 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2021-05-02 15:30:36,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:30:36,651 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2021-05-02 15:30:36,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 15:30:36,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:36,651 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:36,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:36,865 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:36,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:36,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1995039641, now seen corresponding path program 2 times [2021-05-02 15:30:36,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:36,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726336772] [2021-05-02 15:30:36,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:36,871 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:36,871 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1641405931] [2021-05-02 15:30:36,871 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 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 15:30:37,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:30:37,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:30:37,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 15:30:37,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:37,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:37,437 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 43 proven. 34 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 15:30:37,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:37,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726336772] [2021-05-02 15:30:37,437 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:37,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641405931] [2021-05-02 15:30:37,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641405931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:37,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:37,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:30:37,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964588697] [2021-05-02 15:30:37,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:30:37,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:37,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:30:37,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:30:37,438 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:30:37,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:37,865 INFO L93 Difference]: Finished difference Result 125 states and 148 transitions. [2021-05-02 15:30:37,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:30:37,865 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 64 [2021-05-02 15:30:37,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:37,866 INFO L225 Difference]: With dead ends: 125 [2021-05-02 15:30:37,866 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 15:30:37,867 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 93.3ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:30:37,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 15:30:37,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-05-02 15:30:37,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 69 states have (on average 1.173913043478261) internal successors, (81), 72 states have internal predecessors, (81), 26 states have call successors, (26), 15 states have call predecessors, (26), 14 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:30:37,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 131 transitions. [2021-05-02 15:30:37,873 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 131 transitions. Word has length 64 [2021-05-02 15:30:37,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:37,873 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 131 transitions. [2021-05-02 15:30:37,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:30:37,873 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 131 transitions. [2021-05-02 15:30:37,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:30:37,874 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:37,874 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:38,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:38,082 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:38,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:38,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1140868055, now seen corresponding path program 1 times [2021-05-02 15:30:38,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:38,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131547214] [2021-05-02 15:30:38,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:38,096 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:38,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1761594187] [2021-05-02 15:30:38,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:30:38,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:38,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:30:38,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:38,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,263 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:30:38,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:38,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131547214] [2021-05-02 15:30:38,264 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:38,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761594187] [2021-05-02 15:30:38,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761594187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:38,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:38,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:30:38,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631776936] [2021-05-02 15:30:38,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:30:38,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:38,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:30:38,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:30:38,265 INFO L87 Difference]: Start difference. First operand 110 states and 131 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:30:38,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:38,333 INFO L93 Difference]: Finished difference Result 146 states and 166 transitions. [2021-05-02 15:30:38,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:38,334 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 68 [2021-05-02 15:30:38,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:38,334 INFO L225 Difference]: With dead ends: 146 [2021-05-02 15:30:38,334 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 15:30:38,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 27.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:38,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 15:30:38,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2021-05-02 15:30:38,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 87 states have (on average 1.1379310344827587) internal successors, (99), 89 states have internal predecessors, (99), 26 states have call successors, (26), 19 states have call predecessors, (26), 18 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:30:38,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 149 transitions. [2021-05-02 15:30:38,345 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 149 transitions. Word has length 68 [2021-05-02 15:30:38,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:38,345 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 149 transitions. [2021-05-02 15:30:38,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:30:38,346 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 149 transitions. [2021-05-02 15:30:38,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:30:38,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:38,346 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:38,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 15:30:38,561 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:38,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:38,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1142595933, now seen corresponding path program 1 times [2021-05-02 15:30:38,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:38,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263136131] [2021-05-02 15:30:38,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:38,566 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:38,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [833663092] [2021-05-02 15:30:38,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:30:38,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:38,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 15:30:38,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:38,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:38,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:39,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:40:49,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:40:49,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263136131] [2021-05-02 15:40:49,734 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:40:49,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833663092] [2021-05-02 15:40:49,734 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: -1072721305 [2021-05-02 15:40:49,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:40:49,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-05-02 15:40:49,734 ERROR L212 FreeRefinementEngine]: Strategy CAMEL failed to provide any proof altough trace is infeasible [2021-05-02 15:40:49,734 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 15:40:49,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:40:49,964 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-02 15:40:49,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 03:40:49 BoogieIcfgContainer [2021-05-02 15:40:49,964 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 15:40:49,966 INFO L168 Benchmark]: Toolchain (without parser) took 619367.81 ms. Allocated memory was 184.5 MB in the beginning and 6.6 GB in the end (delta: 6.4 GB). Free memory was 150.2 MB in the beginning and 5.2 GB in the end (delta: -5.1 GB). Peak memory consumption was 4.8 GB. Max. memory is 8.0 GB. [2021-05-02 15:40:49,966 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory was 167.0 MB in the beginning and 166.9 MB in the end (delta: 106.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 15:40:49,966 INFO L168 Benchmark]: CACSL2BoogieTranslator took 201.07 ms. Allocated memory is still 184.5 MB. Free memory was 150.0 MB in the beginning and 140.0 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:49,966 INFO L168 Benchmark]: Boogie Preprocessor took 61.67 ms. Allocated memory is still 184.5 MB. Free memory was 140.0 MB in the beginning and 168.0 MB in the end (delta: -28.0 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:49,966 INFO L168 Benchmark]: RCFGBuilder took 303.51 ms. Allocated memory is still 184.5 MB. Free memory was 167.6 MB in the beginning and 151.9 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:49,966 INFO L168 Benchmark]: TraceAbstraction took 618795.90 ms. Allocated memory was 184.5 MB in the beginning and 6.6 GB in the end (delta: 6.4 GB). Free memory was 151.2 MB in the beginning and 5.2 GB in the end (delta: -5.1 GB). Peak memory consumption was 4.8 GB. Max. memory is 8.0 GB. [2021-05-02 15:40:49,967 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory was 167.0 MB in the beginning and 166.9 MB in the end (delta: 106.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 201.07 ms. Allocated memory is still 184.5 MB. Free memory was 150.0 MB in the beginning and 140.0 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 61.67 ms. Allocated memory is still 184.5 MB. Free memory was 140.0 MB in the beginning and 168.0 MB in the end (delta: -28.0 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 303.51 ms. Allocated memory is still 184.5 MB. Free memory was 167.6 MB in the beginning and 151.9 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 618795.90 ms. Allocated memory was 184.5 MB in the beginning and 6.6 GB in the end (delta: 6.4 GB). Free memory was 151.2 MB in the beginning and 5.2 GB in the end (delta: -5.1 GB). Peak memory consumption was 4.8 GB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 17]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L22] int counter = 0; [L24] unsigned int A, B; [L25] unsigned int r, d, p, q; [L26] A = __VERIFIER_nondet_unsigned_int() [L27] B = __VERIFIER_nondet_unsigned_int() [L28] CALL assume_abort_if_not(B >= 1) [L12] COND FALSE !(!cond) [L28] RET assume_abort_if_not(B >= 1) [L30] r = A [L31] d = B [L32] p = 1 [L33] q = 0 [L35] EXPR counter++ [L35] COND TRUE counter++<20 [L36] CALL __VERIFIER_assert(q == 0) [L15] COND FALSE !(!(cond)) [L36] RET __VERIFIER_assert(q == 0) [L37] CALL __VERIFIER_assert(r == A) [L15] COND FALSE !(!(cond)) [L37] RET __VERIFIER_assert(r == A) [L38] CALL __VERIFIER_assert(d == B * p) [L15] COND FALSE !(!(cond)) [L38] RET __VERIFIER_assert(d == B * p) [L39] COND FALSE !(!(r >= d)) [L41] d = 2 * d [L42] p = 2 * p [L35] EXPR counter++ [L35] COND TRUE counter++<20 [L36] CALL __VERIFIER_assert(q == 0) [L15] COND FALSE !(!(cond)) [L36] RET __VERIFIER_assert(q == 0) [L37] CALL __VERIFIER_assert(r == A) [L15] COND FALSE !(!(cond)) [L37] RET __VERIFIER_assert(r == A) [L38] CALL __VERIFIER_assert(d == B * p) [L15] COND FALSE !(!(cond)) [L38] RET __VERIFIER_assert(d == B * p) [L39] COND TRUE !(r >= d) [L45] EXPR counter++ [L45] COND TRUE counter++<20 [L46] CALL __VERIFIER_assert(A == q*B + r) [L15] COND FALSE !(!(cond)) [L46] RET __VERIFIER_assert(A == q*B + r) [L47] CALL __VERIFIER_assert(d == B*p) [L15] COND FALSE !(!(cond)) [L47] RET __VERIFIER_assert(d == B*p) [L49] COND FALSE !(!(p != 1)) [L51] d = d / 2 [L52] p = p / 2 [L53] COND TRUE r >= d [L54] r = r - d [L55] q = q + p [L45] EXPR counter++ [L45] COND TRUE counter++<20 [L46] CALL __VERIFIER_assert(A == q*B + r) [L15] COND TRUE !(cond) [L17] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 618718.8ms, OverallIterations: 15, TraceHistogramMax: 9, EmptinessCheckTime: 20.6ms, AutomataDifference: 1738.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 596 SDtfs, 273 SDslu, 1877 SDs, 0 SdLazy, 1069 SolverSat, 148 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 968.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 545 GetRequests, 452 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 710.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=132occurred in iteration=14, InterpolantAutomatonStates: 103, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 163.1ms AutomataMinimizationTime, 14 MinimizatonAttempts, 27 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 132.0ms SsaConstructionTime, 751.1ms SatisfiabilityAnalysisTime, 1789.6ms InterpolantComputationTime, 564 NumberOfCodeBlocks, 564 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 550 ConstructedInterpolants, 0 QuantifiedInterpolants, 2003 SizeOfPredicates, 30 NumberOfNonLiveVariables, 1852 ConjunctsInSsa, 158 ConjunctsInUnsatCore, 14 InterpolantComputations, 7 PerfectInterpolantSequences, 438/665 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...