/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/prod4br-ll_unwindbound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:15:18,852 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:15:18,853 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:15:18,871 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:15:18,886 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:15:18,887 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:15:18,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:15:18,888 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:15:18,889 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:15:18,889 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:15:18,891 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:15:18,892 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:15:18,896 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:15:18,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:15:18,902 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:15:18,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:15:18,912 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:15:18,930 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:15:18,930 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:15:18,931 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:15:18,931 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 16:15:18,945 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:15:18,945 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:15:18,946 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:15:18,946 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:15:18,946 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:15:18,946 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:15:18,946 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:15:18,947 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:15:18,948 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:15:18,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:15:18,948 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:15:18,949 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:15:18,949 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:15:19,220 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:15:19,235 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:15:19,237 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:15:19,238 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:15:19,240 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:15:19,240 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_unwindbound2.c [2021-05-02 16:15:19,290 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88848795c/9232ac53d0074081a3832f4d86563bdc/FLAG925f2d4da [2021-05-02 16:15:19,635 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:15:19,635 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_unwindbound2.c [2021-05-02 16:15:19,640 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88848795c/9232ac53d0074081a3832f4d86563bdc/FLAG925f2d4da [2021-05-02 16:15:20,032 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88848795c/9232ac53d0074081a3832f4d86563bdc [2021-05-02 16:15:20,034 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:15:20,035 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:15:20,036 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:15:20,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:15:20,049 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:15:20,050 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,051 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@396e89a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20, skipping insertion in model container [2021-05-02 16:15:20,051 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,056 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:15:20,067 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:15:20,186 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/prod4br-ll_unwindbound2.c[524,537] [2021-05-02 16:15:20,209 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:15:20,214 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:15:20,250 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/prod4br-ll_unwindbound2.c[524,537] [2021-05-02 16:15:20,256 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:15:20,264 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:15:20,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20 WrapperNode [2021-05-02 16:15:20,265 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:15:20,265 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:15:20,265 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:15:20,265 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:15:20,275 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,275 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,287 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,296 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,299 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,300 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (1/1) ... [2021-05-02 16:15:20,301 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:15:20,304 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:15:20,304 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:15:20,304 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:15:20,305 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (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 16:15:20,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:15:20,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:15:20,361 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:15:20,361 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:15:20,361 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:15:20,362 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:15:20,362 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:15:20,362 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:15:20,362 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:15:20,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:15:20,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 16:15:20,363 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:15:20,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:15:20,363 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:15:20,365 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:15:20,647 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:15:20,647 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:15:20,648 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:15:20 BoogieIcfgContainer [2021-05-02 16:15:20,648 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:15:20,649 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:15:20,649 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:15:20,651 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:15:20,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:15:20" (1/3) ... [2021-05-02 16:15:20,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4110b54b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:15:20, skipping insertion in model container [2021-05-02 16:15:20,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:15:20" (2/3) ... [2021-05-02 16:15:20,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4110b54b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:15:20, skipping insertion in model container [2021-05-02 16:15:20,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:15:20" (3/3) ... [2021-05-02 16:15:20,652 INFO L111 eAbstractionObserver]: Analyzing ICFG prod4br-ll_unwindbound2.c [2021-05-02 16:15:20,656 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:15:20,658 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:15:20,669 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:15:20,685 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:15:20,685 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:15:20,685 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:15:20,685 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:15:20,685 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:15:20,685 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:15:20,685 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:15:20,685 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:15:20,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:15:20,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:15:20,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:20,701 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:20,701 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:20,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:20,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1717894843, now seen corresponding path program 1 times [2021-05-02 16:15:20,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:20,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992672800] [2021-05-02 16:15:20,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:20,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:20,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:15:20,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:20,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 16:15:20,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:20,916 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 16:15:20,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:20,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992672800] [2021-05-02 16:15:20,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992672800] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:15:20,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:15:20,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:15:20,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364050192] [2021-05-02 16:15:20,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:15:20,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:20,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:15:20,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:15:20,930 INFO L87 Difference]: Start difference. First operand has 32 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 16:15:21,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:21,016 INFO L93 Difference]: Finished difference Result 56 states and 77 transitions. [2021-05-02 16:15:21,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:15:21,017 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 17 [2021-05-02 16:15:21,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:21,022 INFO L225 Difference]: With dead ends: 56 [2021-05-02 16:15:21,022 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 16:15:21,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:15:21,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 16:15:21,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 16:15:21,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:15:21,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-02 16:15:21,049 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 17 [2021-05-02 16:15:21,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:21,049 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-02 16:15:21,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 16:15:21,049 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-02 16:15:21,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 16:15:21,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:21,050 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 16:15:21,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:15:21,051 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:21,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:21,051 INFO L82 PathProgramCache]: Analyzing trace with hash 444281082, now seen corresponding path program 1 times [2021-05-02 16:15:21,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:21,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306245709] [2021-05-02 16:15:21,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:21,063 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:21,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1535496193] [2021-05-02 16:15:21,064 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 16:15:21,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:21,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 16:15:21,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:21,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,247 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 16:15:21,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:21,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306245709] [2021-05-02 16:15:21,248 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:21,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535496193] [2021-05-02 16:15:21,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535496193] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:15:21,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:15:21,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 16:15:21,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994136303] [2021-05-02 16:15:21,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 16:15:21,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:21,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 16:15:21,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:15:21,251 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (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 16:15:21,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:21,263 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2021-05-02 16:15:21,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 16:15:21,264 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (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 18 [2021-05-02 16:15:21,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:21,265 INFO L225 Difference]: With dead ends: 37 [2021-05-02 16:15:21,265 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 16:15:21,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:15:21,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 16:15:21,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 16:15:21,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:15:21,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-05-02 16:15:21,271 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 18 [2021-05-02 16:15:21,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:21,271 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-05-02 16:15:21,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (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 16:15:21,271 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-05-02 16:15:21,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 16:15:21,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:21,272 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 16:15:21,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:15:21,487 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:21,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:21,488 INFO L82 PathProgramCache]: Analyzing trace with hash 446068542, now seen corresponding path program 1 times [2021-05-02 16:15:21,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:21,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303015127] [2021-05-02 16:15:21,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:21,497 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:21,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [102891679] [2021-05-02 16:15:21,498 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 16:15:21,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:21,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 16:15:21,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:21,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:21,647 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 16:15:21,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:21,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303015127] [2021-05-02 16:15:21,647 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:21,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102891679] [2021-05-02 16:15:21,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102891679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:15:21,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:15:21,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 16:15:21,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710903496] [2021-05-02 16:15:21,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:15:21,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:21,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:15:21,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:15:21,649 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 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 16:15:21,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:21,783 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2021-05-02 16:15:21,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:15:21,784 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 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 16:15:21,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:21,785 INFO L225 Difference]: With dead ends: 42 [2021-05-02 16:15:21,785 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 16:15:21,787 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 40.4ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:15:21,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 16:15:21,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-05-02 16:15:21,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 24 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:15:21,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 16:15:21,801 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 18 [2021-05-02 16:15:21,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:21,802 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 16:15:21,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 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 16:15:21,803 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 16:15:21,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 16:15:21,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:21,804 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, 1] [2021-05-02 16:15:22,019 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:22,019 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:22,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:22,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1308579644, now seen corresponding path program 1 times [2021-05-02 16:15:22,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:22,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133109949] [2021-05-02 16:15:22,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:22,029 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:22,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1225377721] [2021-05-02 16:15:22,030 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 16:15:22,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:22,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:15:22,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:22,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:22,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:22,365 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:22,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133109949] [2021-05-02 16:15:22,365 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:22,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225377721] [2021-05-02 16:15:22,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225377721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:22,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:22,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 16:15:22,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182680326] [2021-05-02 16:15:22,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 16:15:22,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:22,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 16:15:22,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 16:15:22,372 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:22,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:22,723 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2021-05-02 16:15:22,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 16:15:22,723 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 16:15:22,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:22,726 INFO L225 Difference]: With dead ends: 51 [2021-05-02 16:15:22,726 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 16:15:22,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 222.2ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-02 16:15:22,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 16:15:22,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-05-02 16:15:22,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 29 states have internal predecessors, (36), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:15:22,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-05-02 16:15:22,759 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 24 [2021-05-02 16:15:22,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:22,759 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-05-02 16:15:22,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:22,759 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-05-02 16:15:22,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 16:15:22,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:22,761 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:22,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:22,976 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:22,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:22,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1797927234, now seen corresponding path program 1 times [2021-05-02 16:15:22,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:22,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058254146] [2021-05-02 16:15:22,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:22,988 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:22,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338465076] [2021-05-02 16:15:22,988 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 16:15:23,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:23,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 16:15:23,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:23,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:23,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:23,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058254146] [2021-05-02 16:15:23,102 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:23,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338465076] [2021-05-02 16:15:23,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338465076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:23,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:23,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 16:15:23,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53340060] [2021-05-02 16:15:23,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:15:23,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:23,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:15:23,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:15:23,103 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:15:23,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:23,231 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2021-05-02 16:15:23,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 16:15:23,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2021-05-02 16:15:23,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:23,233 INFO L225 Difference]: With dead ends: 56 [2021-05-02 16:15:23,233 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 16:15:23,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:15:23,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 16:15:23,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 16:15:23,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 36 states have internal predecessors, (47), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:15:23,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2021-05-02 16:15:23,254 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 27 [2021-05-02 16:15:23,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:23,254 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2021-05-02 16:15:23,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:15:23,254 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2021-05-02 16:15:23,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 16:15:23,255 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:23,255 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:23,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:23,470 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:23,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:23,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1799714694, now seen corresponding path program 1 times [2021-05-02 16:15:23,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:23,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822926420] [2021-05-02 16:15:23,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:23,479 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:23,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1316864733] [2021-05-02 16:15:23,479 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 16:15:23,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:23,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 16:15:23,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:23,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:23,748 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:23,748 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:23,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822926420] [2021-05-02 16:15:23,749 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:23,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316864733] [2021-05-02 16:15:23,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316864733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:23,749 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:23,749 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 16:15:23,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587677449] [2021-05-02 16:15:23,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 16:15:23,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:23,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 16:15:23,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:15:23,750 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:28,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:28,234 INFO L93 Difference]: Finished difference Result 63 states and 81 transitions. [2021-05-02 16:15:28,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 16:15:28,234 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-02 16:15:28,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:28,235 INFO L225 Difference]: With dead ends: 63 [2021-05-02 16:15:28,235 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 16:15:28,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 100.4ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 16:15:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 16:15:28,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2021-05-02 16:15:28,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.3) internal successors, (52), 42 states have internal predecessors, (52), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:15:28,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2021-05-02 16:15:28,241 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 27 [2021-05-02 16:15:28,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:28,242 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2021-05-02 16:15:28,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2021-05-02 16:15:28,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:15:28,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:28,242 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:28,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:28,465 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:28,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:28,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1357155568, now seen corresponding path program 1 times [2021-05-02 16:15:28,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:28,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749637051] [2021-05-02 16:15:28,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:28,491 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:28,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [857889502] [2021-05-02 16:15:28,491 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 16:15:28,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:28,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 16:15:28,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:28,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:28,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:28,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:28,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:28,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:28,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:28,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749637051] [2021-05-02 16:15:28,715 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:28,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857889502] [2021-05-02 16:15:28,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857889502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:28,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:28,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 16:15:28,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394679806] [2021-05-02 16:15:28,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 16:15:28,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:28,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 16:15:28,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:15:28,720 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:33,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:33,186 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2021-05-02 16:15:33,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 16:15:33,187 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 16:15:33,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:33,188 INFO L225 Difference]: With dead ends: 79 [2021-05-02 16:15:33,188 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 16:15:33,188 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 135.8ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 16:15:33,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 16:15:33,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 16:15:33,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.297872340425532) internal successors, (61), 49 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 16:15:33,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 79 transitions. [2021-05-02 16:15:33,193 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 79 transitions. Word has length 28 [2021-05-02 16:15:33,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:33,193 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 79 transitions. [2021-05-02 16:15:33,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:33,193 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 79 transitions. [2021-05-02 16:15:33,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 16:15:33,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:33,194 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:33,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:33,409 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:33,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:33,409 INFO L82 PathProgramCache]: Analyzing trace with hash -293334773, now seen corresponding path program 1 times [2021-05-02 16:15:33,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:33,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931400256] [2021-05-02 16:15:33,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:33,416 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:33,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1658444470] [2021-05-02 16:15:33,416 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 16:15:33,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:33,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 16:15:33,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:33,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:33,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:33,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:33,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:33,613 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:33,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:33,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931400256] [2021-05-02 16:15:33,614 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:33,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658444470] [2021-05-02 16:15:33,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658444470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:33,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:33,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 16:15:33,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519826205] [2021-05-02 16:15:33,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 16:15:33,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:33,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 16:15:33,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:15:33,615 INFO L87 Difference]: Start difference. First operand 64 states and 79 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:38,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:38,126 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2021-05-02 16:15:38,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 16:15:38,126 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 16:15:38,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:38,128 INFO L225 Difference]: With dead ends: 92 [2021-05-02 16:15:38,128 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 16:15:38,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 95.8ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 16:15:38,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 16:15:38,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-05-02 16:15:38,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 55 states have (on average 1.290909090909091) internal successors, (71), 57 states have internal predecessors, (71), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 16:15:38,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2021-05-02 16:15:38,136 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 29 [2021-05-02 16:15:38,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:38,136 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2021-05-02 16:15:38,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:38,137 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2021-05-02 16:15:38,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 16:15:38,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:38,137 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:38,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:38,338 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:38,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:38,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1481672589, now seen corresponding path program 1 times [2021-05-02 16:15:38,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:38,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582059084] [2021-05-02 16:15:38,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:38,345 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:38,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2047618231] [2021-05-02 16:15:38,345 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 16:15:38,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:38,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 16:15:38,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:38,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:15:38,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:38,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582059084] [2021-05-02 16:15:38,526 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:38,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047618231] [2021-05-02 16:15:38,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047618231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:38,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:38,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:15:38,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855925816] [2021-05-02 16:15:38,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:15:38,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:38,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:15:38,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:15:38,529 INFO L87 Difference]: Start difference. First operand 74 states and 91 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:38,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:38,677 INFO L93 Difference]: Finished difference Result 87 states and 109 transitions. [2021-05-02 16:15:38,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:15:38,678 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 16:15:38,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:38,678 INFO L225 Difference]: With dead ends: 87 [2021-05-02 16:15:38,678 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 16:15:38,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 68.4ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:15:38,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 16:15:38,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 72. [2021-05-02 16:15:38,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 55 states have internal predecessors, (69), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 16:15:38,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2021-05-02 16:15:38,684 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 29 [2021-05-02 16:15:38,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:38,684 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2021-05-02 16:15:38,684 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:15:38,684 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2021-05-02 16:15:38,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 16:15:38,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:38,685 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:38,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 16:15:38,885 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:38,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:38,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1680888588, now seen corresponding path program 1 times [2021-05-02 16:15:38,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:38,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504351540] [2021-05-02 16:15:38,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:38,892 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:38,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [16048539] [2021-05-02 16:15:38,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:15:38,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:38,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 16:15:38,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:38,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:38,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,031 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 16:15:39,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:39,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504351540] [2021-05-02 16:15:39,032 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:39,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16048539] [2021-05-02 16:15:39,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16048539] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:15:39,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:15:39,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 16:15:39,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386617438] [2021-05-02 16:15:39,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:15:39,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:39,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:15:39,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:15:39,033 INFO L87 Difference]: Start difference. First operand 72 states and 89 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:39,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:39,143 INFO L93 Difference]: Finished difference Result 98 states and 127 transitions. [2021-05-02 16:15:39,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 16:15:39,143 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 33 [2021-05-02 16:15:39,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:39,144 INFO L225 Difference]: With dead ends: 98 [2021-05-02 16:15:39,144 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 16:15:39,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 48.5ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:15:39,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 16:15:39,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2021-05-02 16:15:39,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 66 states have internal predecessors, (84), 14 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 16:15:39,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2021-05-02 16:15:39,150 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 33 [2021-05-02 16:15:39,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:39,151 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2021-05-02 16:15:39,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:39,151 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2021-05-02 16:15:39,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 16:15:39,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:39,151 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:39,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:39,367 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:39,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:39,367 INFO L82 PathProgramCache]: Analyzing trace with hash 368374993, now seen corresponding path program 1 times [2021-05-02 16:15:39,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:39,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871198316] [2021-05-02 16:15:39,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:39,374 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:39,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1477094233] [2021-05-02 16:15:39,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:39,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:39,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 16:15:39,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:39,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:39,625 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 16:15:39,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:39,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871198316] [2021-05-02 16:15:39,626 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:39,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477094233] [2021-05-02 16:15:39,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477094233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:39,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:39,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 16:15:39,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963430245] [2021-05-02 16:15:39,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 16:15:39,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:39,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 16:15:39,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 16:15:39,627 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:41,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:41,934 INFO L93 Difference]: Finished difference Result 103 states and 137 transitions. [2021-05-02 16:15:41,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 16:15:41,934 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-05-02 16:15:41,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:41,936 INFO L225 Difference]: With dead ends: 103 [2021-05-02 16:15:41,936 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 16:15:41,937 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 197.5ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-05-02 16:15:41,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 16:15:41,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 94. [2021-05-02 16:15:41,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 73 states have internal predecessors, (92), 16 states have call successors, (16), 9 states have call predecessors, (16), 8 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 16:15:41,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2021-05-02 16:15:41,943 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 35 [2021-05-02 16:15:41,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:41,943 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2021-05-02 16:15:41,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:41,943 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2021-05-02 16:15:41,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 16:15:41,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:41,944 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:42,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 16:15:42,159 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:42,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:42,159 INFO L82 PathProgramCache]: Analyzing trace with hash -218431021, now seen corresponding path program 1 times [2021-05-02 16:15:42,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:42,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307195367] [2021-05-02 16:15:42,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:42,165 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:42,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1306533692] [2021-05-02 16:15:42,165 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 16:15:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:15:42,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 16:15:42,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:15:42,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:15:42,506 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 16:15:42,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:15:42,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307195367] [2021-05-02 16:15:42,507 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:15:42,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306533692] [2021-05-02 16:15:42,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306533692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:15:42,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:15:42,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 16:15:42,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220074987] [2021-05-02 16:15:42,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 16:15:42,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:15:42,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 16:15:42,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 16:15:42,508 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:43,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:15:43,495 INFO L93 Difference]: Finished difference Result 123 states and 163 transitions. [2021-05-02 16:15:43,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 16:15:43,495 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-05-02 16:15:43,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:15:43,496 INFO L225 Difference]: With dead ends: 123 [2021-05-02 16:15:43,496 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 16:15:43,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 420.4ms TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-05-02 16:15:43,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 16:15:43,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 101. [2021-05-02 16:15:43,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 75 states have (on average 1.3466666666666667) internal successors, (101), 79 states have internal predecessors, (101), 17 states have call successors, (17), 9 states have call predecessors, (17), 8 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 16:15:43,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 133 transitions. [2021-05-02 16:15:43,504 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 133 transitions. Word has length 35 [2021-05-02 16:15:43,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:15:43,504 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 133 transitions. [2021-05-02 16:15:43,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:15:43,505 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 133 transitions. [2021-05-02 16:15:43,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 16:15:43,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:15:43,505 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:15:43,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 16:15:43,721 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:15:43,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:15:43,721 INFO L82 PathProgramCache]: Analyzing trace with hash 604176890, now seen corresponding path program 2 times [2021-05-02 16:15:43,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:15:43,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375834453] [2021-05-02 16:15:43,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:15:43,731 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:15:43,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [48362765] [2021-05-02 16:15:43,732 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 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 16:15:43,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:15:43,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-05-02 16:15:43,774 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 16:15:43,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 16:15:43,787 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 16:15:43,818 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 16:15:43,818 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 16:15:44,019 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:15:44,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 04:15:44 BoogieIcfgContainer [2021-05-02 16:15:44,053 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 16:15:44,054 INFO L168 Benchmark]: Toolchain (without parser) took 24019.20 ms. Allocated memory was 209.7 MB in the beginning and 251.7 MB in the end (delta: 41.9 MB). Free memory was 174.8 MB in the beginning and 202.5 MB in the end (delta: -27.7 MB). Peak memory consumption was 15.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 209.7 MB. Free memory is still 191.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.25 ms. Allocated memory is still 209.7 MB. Free memory was 174.6 MB in the beginning and 192.5 MB in the end (delta: -17.9 MB). Peak memory consumption was 11.7 MB. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L168 Benchmark]: Boogie Preprocessor took 35.40 ms. Allocated memory is still 209.7 MB. Free memory was 192.5 MB in the beginning and 191.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L168 Benchmark]: RCFGBuilder took 343.73 ms. Allocated memory is still 209.7 MB. Free memory was 190.6 MB in the beginning and 174.2 MB in the end (delta: 16.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L168 Benchmark]: TraceAbstraction took 23404.46 ms. Allocated memory was 209.7 MB in the beginning and 251.7 MB in the end (delta: 41.9 MB). Free memory was 173.6 MB in the beginning and 202.5 MB in the end (delta: -28.8 MB). Peak memory consumption was 13.1 MB. Max. memory is 8.0 GB. [2021-05-02 16:15:44,054 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 209.7 MB. Free memory is still 191.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 229.25 ms. Allocated memory is still 209.7 MB. Free memory was 174.6 MB in the beginning and 192.5 MB in the end (delta: -17.9 MB). Peak memory consumption was 11.7 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.40 ms. Allocated memory is still 209.7 MB. Free memory was 192.5 MB in the beginning and 191.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 343.73 ms. Allocated memory is still 209.7 MB. Free memory was 190.6 MB in the beginning and 174.2 MB in the end (delta: 16.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 23404.46 ms. Allocated memory was 209.7 MB in the beginning and 251.7 MB in the end (delta: 41.9 MB). Free memory was 173.6 MB in the beginning and 202.5 MB in the end (delta: -28.8 MB). Peak memory consumption was 13.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 14]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int counter = 0; VAL [\old(counter)=14, counter=0] [L21] int x, y; [L22] long long a, b, p, q; [L24] x = __VERIFIER_nondet_int() [L25] y = __VERIFIER_nondet_int() [L26] CALL assume_abort_if_not(y >= 1) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L9] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L26] RET assume_abort_if_not(y >= 1) VAL [\old(counter)=0, counter=0, x=4, y=4] [L28] a = x [L29] b = y [L30] p = 1 [L31] q = 0 VAL [\old(counter)=0, a=4, b=4, counter=0, p=1, q=0, x=4, y=4] [L33] EXPR counter++ VAL [\old(counter)=0, a=4, b=4, counter=1, counter++=0, p=1, q=0, x=4, y=4] [L33] COND TRUE counter++<2 [L34] CALL __VERIFIER_assert(q + a * b * p == (long long) x * y) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L34] RET __VERIFIER_assert(q + a * b * p == (long long) x * y) VAL [\old(counter)=0, a=4, b=4, counter=1, p=1, q=0, x=4, y=4] [L36] COND FALSE !(!(a != 0 && b != 0)) VAL [\old(counter)=0, a=4, b=4, counter=1, p=1, q=0, x=4, y=4] [L39] COND TRUE a % 2 == 0 && b % 2 == 0 [L40] a = a / 2 [L41] b = b / 2 [L42] p = 4 * p VAL [\old(counter)=0, a=2, b=2, counter=1, p=4, q=0, x=4, y=4] [L33] EXPR counter++ VAL [\old(counter)=0, a=2, b=2, counter=2, counter++=1, p=4, q=0, x=4, y=4] [L33] COND TRUE counter++<2 [L34] CALL __VERIFIER_assert(q + a * b * p == (long long) x * y) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L34] RET __VERIFIER_assert(q + a * b * p == (long long) x * y) VAL [\old(counter)=0, a=2, b=2, counter=2, p=4, q=0, x=4, y=4] [L36] COND FALSE !(!(a != 0 && b != 0)) VAL [\old(counter)=0, a=2, b=2, counter=2, p=4, q=0, x=4, y=4] [L39] COND TRUE a % 2 == 0 && b % 2 == 0 [L40] a = a / 2 [L41] b = b / 2 [L42] p = 4 * p VAL [\old(counter)=0, a=1, b=1, counter=2, p=16, q=0, x=4, y=4] [L33] EXPR counter++ VAL [\old(counter)=0, a=1, b=1, counter=3, counter++=2, p=16, q=0, x=4, y=4] [L33] COND FALSE !(counter++<2) [L56] CALL __VERIFIER_assert(q == (long long) x * y) VAL [\old(cond)=0, \old(counter)=0, counter=3] [L12] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] [L14] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 23336.1ms, OverallIterations: 13, TraceHistogramMax: 3, EmptinessCheckTime: 14.2ms, AutomataDifference: 17775.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 308 SDtfs, 327 SDslu, 1295 SDs, 0 SdLazy, 1678 SolverSat, 117 SolverUnsat, 7 SolverUnknown, 0 SolverNotchecked, 15866.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 335 GetRequests, 211 SyntacticMatches, 4 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1388.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=12, InterpolantAutomatonStates: 116, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 129.5ms AutomataMinimizationTime, 12 MinimizatonAttempts, 53 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 83.5ms SsaConstructionTime, 293.3ms SatisfiabilityAnalysisTime, 1938.5ms InterpolantComputationTime, 356 NumberOfCodeBlocks, 356 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 308 ConstructedInterpolants, 0 QuantifiedInterpolants, 1731 SizeOfPredicates, 36 NumberOfNonLiveVariables, 1565 ConjunctsInSsa, 239 ConjunctsInUnsatCore, 12 InterpolantComputations, 4 PerfectInterpolantSequences, 38/62 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 proved your program to be incorrect! Received shutdown request...