/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/fermat2-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:12:36,238 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:12:36,240 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:12:36,275 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:12:36,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:12:36,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:12:36,297 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:12:36,298 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:12:36,300 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:12:36,301 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:12:36,303 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:12:36,308 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:12:36,309 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:12:36,311 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:12:36,312 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:12:36,314 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:12:36,320 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:12:36,327 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:12:36,328 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:12:36,328 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:12:36,332 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 15:12:36,370 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:12:36,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:12:36,373 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:12:36,373 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:12:36,373 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:12:36,373 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:12:36,373 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:12:36,374 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:12:36,374 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:12:36,374 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:12:36,375 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:12:36,375 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:12:36,376 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:12:36,376 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:12:36,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:12:36,376 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:12:36,376 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:12:36,376 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:12:36,377 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:12:36,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:12:36,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:12:36,377 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:12:36,377 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:12:36,686 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:12:36,712 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:12:36,714 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:12:36,715 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:12:36,716 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:12:36,717 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/fermat2-ll_unwindbound20.c [2021-05-02 15:12:36,772 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbcfbe32/b6c100ff235a40a3b1f96528bdc82ccd/FLAGd15c38933 [2021-05-02 15:12:37,136 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:12:37,137 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat2-ll_unwindbound20.c [2021-05-02 15:12:37,141 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbcfbe32/b6c100ff235a40a3b1f96528bdc82ccd/FLAGd15c38933 [2021-05-02 15:12:37,153 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cbcfbe32/b6c100ff235a40a3b1f96528bdc82ccd [2021-05-02 15:12:37,154 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:12:37,156 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:12:37,161 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:12:37,161 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:12:37,164 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:12:37,164 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e7322f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37, skipping insertion in model container [2021-05-02 15:12:37,165 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,171 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:12:37,182 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:12:37,278 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/fermat2-ll_unwindbound20.c[524,537] [2021-05-02 15:12:37,298 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:12:37,304 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:12:37,318 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/fermat2-ll_unwindbound20.c[524,537] [2021-05-02 15:12:37,324 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:12:37,334 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:12:37,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37 WrapperNode [2021-05-02 15:12:37,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:12:37,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:12:37,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:12:37,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:12:37,359 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,373 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,374 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,380 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,384 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... [2021-05-02 15:12:37,386 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:12:37,386 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:12:37,387 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:12:37,387 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:12:37,387 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:12:37,448 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:12:37,449 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:12:37,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:12:37,689 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:12:37,689 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 15:12:37,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:12:37 BoogieIcfgContainer [2021-05-02 15:12:37,690 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:12:37,692 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:12:37,692 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:12:37,708 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:12:37,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:12:37" (1/3) ... [2021-05-02 15:12:37,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@421402d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:12:37, skipping insertion in model container [2021-05-02 15:12:37,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:12:37" (2/3) ... [2021-05-02 15:12:37,709 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@421402d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:12:37, skipping insertion in model container [2021-05-02 15:12:37,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:12:37" (3/3) ... [2021-05-02 15:12:37,710 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat2-ll_unwindbound20.c [2021-05-02 15:12:37,714 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:12:37,717 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:12:37,747 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:12:37,790 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:12:37,790 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:12:37,790 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:12:37,797 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:12:37,797 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:12:37,798 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:12:37,798 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:12:37,798 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:12:37,814 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 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 15:12:37,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 15:12:37,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:37,819 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:37,820 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:37,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:37,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1859024204, now seen corresponding path program 1 times [2021-05-02 15:12:37,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:37,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658510506] [2021-05-02 15:12:37,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:37,953 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:37,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1818224312] [2021-05-02 15:12:37,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:38,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:12:38,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 1 conjunts are in the unsatisfiable core [2021-05-02 15:12:38,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:38,151 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:12:38,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:38,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658510506] [2021-05-02 15:12:38,151 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:38,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818224312] [2021-05-02 15:12:38,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818224312] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:12:38,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:12:38,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-02 15:12:38,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476428019] [2021-05-02 15:12:38,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-05-02 15:12:38,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:38,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-05-02 15:12:38,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:12:38,179 INFO L87 Difference]: Start difference. First operand has 30 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 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 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:38,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:38,200 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2021-05-02 15:12:38,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-05-02 15:12:38,201 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 15:12:38,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:38,207 INFO L225 Difference]: With dead ends: 53 [2021-05-02 15:12:38,208 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 15:12:38,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:12:38,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 15:12:38,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 15:12:38,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 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 15:12:38,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-05-02 15:12:38,243 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22 [2021-05-02 15:12:38,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:38,244 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-05-02 15:12:38,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:38,245 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-05-02 15:12:38,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:12:38,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:38,246 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:38,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 15:12:38,468 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:38,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:38,470 INFO L82 PathProgramCache]: Analyzing trace with hash 243739414, now seen corresponding path program 1 times [2021-05-02 15:12:38,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:38,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868583750] [2021-05-02 15:12:38,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:38,482 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:38,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1837041510] [2021-05-02 15:12:38,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:38,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:12:38,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:12:38,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:38,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:38,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:38,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:38,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:38,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:38,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:12:38,701 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:38,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868583750] [2021-05-02 15:12:38,701 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:38,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837041510] [2021-05-02 15:12:38,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837041510] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:12:38,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:12:38,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:12:38,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098133938] [2021-05-02 15:12:38,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:12:38,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:38,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:12:38,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:12:38,707 INFO L87 Difference]: Start difference. First operand 25 states and 29 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:38,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:38,722 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 15:12:38,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:12:38,723 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:12:38,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:38,727 INFO L225 Difference]: With dead ends: 34 [2021-05-02 15:12:38,728 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 15:12:38,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:12:38,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 15:12:38,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 15:12:38,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 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 15:12:38,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-05-02 15:12:38,739 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 23 [2021-05-02 15:12:38,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:38,740 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-05-02 15:12:38,740 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:38,745 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-05-02 15:12:38,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:12:38,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:38,746 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:38,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:38,961 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:38,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:38,961 INFO L82 PathProgramCache]: Analyzing trace with hash 245526874, now seen corresponding path program 1 times [2021-05-02 15:12:38,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:38,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369610673] [2021-05-02 15:12:38,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:38,973 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:38,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1720343735] [2021-05-02 15:12:38,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:39,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:12:39,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:12:39,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:39,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:39,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:39,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:39,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:39,224 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:12:39,224 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:39,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369610673] [2021-05-02 15:12:39,224 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:39,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720343735] [2021-05-02 15:12:39,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720343735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:39,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:39,225 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:12:39,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755696542] [2021-05-02 15:12:39,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:12:39,225 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:39,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:12:39,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:12:39,226 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:46,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:46,901 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-05-02 15:12:46,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:12:46,902 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:12:46,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:46,903 INFO L225 Difference]: With dead ends: 37 [2021-05-02 15:12:46,903 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 15:12:46,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:12:46,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 15:12:46,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2021-05-02 15:12:46,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 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 15:12:46,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 15:12:46,914 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2021-05-02 15:12:46,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:46,915 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 15:12:46,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:12:46,915 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 15:12:46,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 15:12:46,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:46,916 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 15:12:47,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:47,121 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:47,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:47,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1019533657, now seen corresponding path program 1 times [2021-05-02 15:12:47,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:47,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218144023] [2021-05-02 15:12:47,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:47,130 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:47,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1398327622] [2021-05-02 15:12:47,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:47,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:12:47,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:12:47,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:47,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:47,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:12:47,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:47,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218144023] [2021-05-02 15:12:47,443 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:47,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398327622] [2021-05-02 15:12:47,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398327622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:47,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:47,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:12:47,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713130558] [2021-05-02 15:12:47,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:12:47,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:47,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:12:47,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:12:47,445 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:13:12,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:13:12,823 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-02 15:13:12,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:13:12,824 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 15:13:12,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:13:12,826 INFO L225 Difference]: With dead ends: 39 [2021-05-02 15:13:12,826 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 15:13:12,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 169.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:13:12,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 15:13:12,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 15:13:12,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 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 15:13:12,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 15:13:12,836 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2021-05-02 15:13:12,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:13:12,837 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 15:13:12,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:13:12,837 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 15:13:12,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 15:13:12,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:13:12,838 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:13:13,051 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:13,052 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:13:13,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:13:13,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1080225052, now seen corresponding path program 1 times [2021-05-02 15:13:13,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:13:13,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809460821] [2021-05-02 15:13:13,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:13:13,074 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:13:13,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1467076323] [2021-05-02 15:13:13,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:13,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:13:13,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:13:13,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:13:13,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,210 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:13:13,210 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:13:13,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809460821] [2021-05-02 15:13:13,210 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:13:13,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467076323] [2021-05-02 15:13:13,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467076323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:13:13,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:13:13,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:13:13,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387276533] [2021-05-02 15:13:13,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:13:13,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:13:13,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:13:13,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:13:13,212 INFO L87 Difference]: Start difference. First operand 32 states and 35 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:13:13,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:13:13,246 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-02 15:13:13,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:13:13,247 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 15:13:13,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:13:13,248 INFO L225 Difference]: With dead ends: 43 [2021-05-02 15:13:13,248 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 15:13:13,248 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 15.7ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:13:13,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 15:13:13,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 15:13:13,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 25 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 15:13:13,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-02 15:13:13,255 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 32 [2021-05-02 15:13:13,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:13:13,255 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-02 15:13:13,255 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:13:13,255 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-02 15:13:13,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 15:13:13,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:13:13,256 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:13:13,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:13,473 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:13:13,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:13:13,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1082012512, now seen corresponding path program 1 times [2021-05-02 15:13:13,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:13:13,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222516710] [2021-05-02 15:13:13,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:13:13,485 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:13:13,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1995911659] [2021-05-02 15:13:13,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:13,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:13:13,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 15:13:13,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:13:13,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:13,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,789 WARN L205 SmtUtils]: Spent 8.12 s on a formula simplification that was a NOOP. DAG size: 25 [2021-05-02 15:13:21,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:21,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,121 WARN L205 SmtUtils]: Spent 8.30 s on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 15:13:30,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:30,195 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:13:30,196 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:13:30,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222516710] [2021-05-02 15:13:30,196 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:13:30,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995911659] [2021-05-02 15:13:30,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995911659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:13:30,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:13:30,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:13:30,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780581731] [2021-05-02 15:13:30,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:13:30,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:13:30,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:13:30,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:13:30,197 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:13:45,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:13:45,036 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2021-05-02 15:13:45,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:13:45,036 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 15:13:45,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:13:45,037 INFO L225 Difference]: With dead ends: 53 [2021-05-02 15:13:45,037 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 15:13:45,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 16538.5ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:13:45,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 15:13:45,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 43. [2021-05-02 15:13:45,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 31 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:13:45,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-02 15:13:45,045 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 32 [2021-05-02 15:13:45,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:13:45,045 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-02 15:13:45,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:13:45,045 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-02 15:13:45,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 15:13:45,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:13:45,046 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:13:45,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:45,249 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:13:45,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:13:45,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1437947422, now seen corresponding path program 1 times [2021-05-02 15:13:45,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:13:45,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129472075] [2021-05-02 15:13:45,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:13:45,258 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:13:45,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [923415882] [2021-05-02 15:13:45,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:13:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:13:45,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 15:13:45,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:13:45,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:45,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:45,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:45,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:55,497 WARN L205 SmtUtils]: Spent 8.03 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:14:22,617 WARN L205 SmtUtils]: Spent 19.05 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 15:14:22,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:22,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:22,698 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 4 refuted. 3 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:14:22,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:22,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129472075] [2021-05-02 15:14:22,698 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:22,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923415882] [2021-05-02 15:14:22,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923415882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:22,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:22,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:14:22,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420887509] [2021-05-02 15:14:22,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:14:22,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:22,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:14:22,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=104, Unknown=5, NotChecked=0, Total=132 [2021-05-02 15:14:22,700 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:15:29,841 WARN L205 SmtUtils]: Spent 19.29 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:16:12,556 WARN L205 SmtUtils]: Spent 22.31 s on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 15:16:32,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:16:32,273 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-02 15:16:32,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:16:32,273 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 15:16:32,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:16:32,274 INFO L225 Difference]: With dead ends: 51 [2021-05-02 15:16:32,274 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 15:16:32,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 101314.2ms TimeCoverageRelationStatistics Valid=52, Invalid=239, Unknown=15, NotChecked=0, Total=306 [2021-05-02 15:16:32,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 15:16:32,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 41. [2021-05-02 15:16:32,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 29 states have internal predecessors, (31), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:16:32,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-05-02 15:16:32,281 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2021-05-02 15:16:32,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:16:32,281 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-05-02 15:16:32,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:16:32,281 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-05-02 15:16:32,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:16:32,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:16:32,282 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:16:32,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:16:32,501 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:16:32,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:16:32,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1448743382, now seen corresponding path program 2 times [2021-05-02 15:16:32,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:16:32,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926462587] [2021-05-02 15:16:32,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:16:32,510 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:16:32,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1185695728] [2021-05-02 15:16:32,510 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:16:32,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:16:32,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:16:32,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:16:32,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:16:32,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:32,672 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:16:32,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:16:32,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926462587] [2021-05-02 15:16:32,673 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:16:32,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185695728] [2021-05-02 15:16:32,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185695728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:16:32,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:16:32,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:16:32,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876826470] [2021-05-02 15:16:32,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:16:32,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:16:32,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:16:32,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:16:32,674 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:16:32,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:16:32,733 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-02 15:16:32,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:16:32,733 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:16:32,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:16:32,736 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:16:32,736 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:16:32,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 27.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:16:32,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:16:32,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 15:16:32,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:16:32,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-05-02 15:16:32,757 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 41 [2021-05-02 15:16:32,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:16:32,757 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-05-02 15:16:32,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:16:32,757 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-05-02 15:16:32,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:16:32,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:16:32,758 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:16:32,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 15:16:32,965 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:16:32,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:16:32,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1450530842, now seen corresponding path program 2 times [2021-05-02 15:16:32,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:16:32,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832467816] [2021-05-02 15:16:32,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:16:32,979 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:16:32,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [696307557] [2021-05-02 15:16:32,979 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:16:33,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:16:33,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:16:33,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 15:16:33,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:16:33,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:33,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,260 WARN L205 SmtUtils]: Spent 3.02 s on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 15:16:36,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:36,449 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:16:36,449 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:16:36,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832467816] [2021-05-02 15:16:36,449 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:16:36,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696307557] [2021-05-02 15:16:36,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696307557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:16:36,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:16:36,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 15:16:36,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123438590] [2021-05-02 15:16:36,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 15:16:36,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:16:36,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 15:16:36,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 15:16:36,451 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:17:17,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:17:17,604 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2021-05-02 15:17:17,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:17:17,604 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:17:17,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:17:17,605 INFO L225 Difference]: With dead ends: 73 [2021-05-02 15:17:17,605 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 15:17:17,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 3202.4ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-02 15:17:17,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 15:17:17,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2021-05-02 15:17:17,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 45 states have internal predecessors, (49), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:17:17,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2021-05-02 15:17:17,614 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 41 [2021-05-02 15:17:17,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:17:17,615 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2021-05-02 15:17:17,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:17:17,615 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2021-05-02 15:17:17,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:17:17,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:17:17,616 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:17:17,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:17:17,821 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:17:17,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:17:17,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1069429092, now seen corresponding path program 1 times [2021-05-02 15:17:17,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:17:17,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810186251] [2021-05-02 15:17:17,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:17:17,855 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:17:17,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [113638511] [2021-05-02 15:17:17,856 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 15:17:17,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:17:17,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:17:17,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:17:17,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:17,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:17,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:17,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,043 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 15:17:18,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:17:18,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810186251] [2021-05-02 15:17:18,044 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:17:18,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113638511] [2021-05-02 15:17:18,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113638511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:17:18,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:17:18,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:17:18,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966854737] [2021-05-02 15:17:18,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:17:18,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:17:18,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:17:18,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:17:18,045 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:17:18,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:17:18,068 INFO L93 Difference]: Finished difference Result 89 states and 103 transitions. [2021-05-02 15:17:18,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:17:18,069 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2021-05-02 15:17:18,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:17:18,070 INFO L225 Difference]: With dead ends: 89 [2021-05-02 15:17:18,070 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 15:17:18,070 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:17:18,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 15:17:18,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2021-05-02 15:17:18,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 53 states have (on average 1.150943396226415) internal successors, (61), 55 states have internal predecessors, (61), 12 states have call successors, (12), 8 states have call predecessors, (12), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 15:17:18,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 83 transitions. [2021-05-02 15:17:18,078 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 83 transitions. Word has length 41 [2021-05-02 15:17:18,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:17:18,078 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 83 transitions. [2021-05-02 15:17:18,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:17:18,079 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 83 transitions. [2021-05-02 15:17:18,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:17:18,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:17:18,079 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:17:18,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:17:18,283 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:17:18,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:17:18,283 INFO L82 PathProgramCache]: Analyzing trace with hash 429462488, now seen corresponding path program 2 times [2021-05-02 15:17:18,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:17:18,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731349] [2021-05-02 15:17:18,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:17:18,296 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:17:18,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [138095992] [2021-05-02 15:17:18,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:17:18,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:17:18,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:17:18,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 15:17:18,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:17:18,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:18,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:17:21,910 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 14 refuted. 1 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:17:21,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:17:21,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731349] [2021-05-02 15:17:21,910 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:17:21,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138095992] [2021-05-02 15:17:21,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138095992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:17:21,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:17:21,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:17:21,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368987921] [2021-05-02 15:17:21,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:17:21,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:17:21,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:17:21,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=153, Unknown=1, NotChecked=0, Total=182 [2021-05-02 15:17:21,912 INFO L87 Difference]: Start difference. First operand 73 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:18:03,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:18:03,268 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-05-02 15:18:03,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 15:18:03,269 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:18:03,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:18:03,270 INFO L225 Difference]: With dead ends: 82 [2021-05-02 15:18:03,270 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 15:18:03,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 6901.8ms TimeCoverageRelationStatistics Valid=67, Invalid=392, Unknown=3, NotChecked=0, Total=462 [2021-05-02 15:18:03,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 15:18:03,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-05-02 15:18:03,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 59 states have internal predecessors, (64), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:18:03,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 88 transitions. [2021-05-02 15:18:03,279 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 88 transitions. Word has length 41 [2021-05-02 15:18:03,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:18:03,279 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 88 transitions. [2021-05-02 15:18:03,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:18:03,279 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 88 transitions. [2021-05-02 15:18:03,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:18:03,280 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:18:03,280 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:18:03,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:18:03,493 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:18:03,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:18:03,493 INFO L82 PathProgramCache]: Analyzing trace with hash -2090497446, now seen corresponding path program 2 times [2021-05-02 15:18:03,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:18:03,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236895739] [2021-05-02 15:18:03,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:18:03,499 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:18:03,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [172497215] [2021-05-02 15:18:03,499 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 15:18:03,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:18:03,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:18:03,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 15:18:03,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:18:03,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:03,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:03,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:03,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:03,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:03,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,831 WARN L205 SmtUtils]: Spent 8.04 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:18:13,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:13,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:15,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:16,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:20,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,401 WARN L205 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 15:18:43,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:18:43,676 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 10 refuted. 6 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 15:18:43,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:18:43,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236895739] [2021-05-02 15:18:43,677 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:18:43,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172497215] [2021-05-02 15:18:43,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172497215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:18:43,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:18:43,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:18:43,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195700253] [2021-05-02 15:18:43,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:18:43,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:18:43,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:18:43,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=142, Unknown=12, NotChecked=0, Total=182 [2021-05-02 15:18:43,678 INFO L87 Difference]: Start difference. First operand 78 states and 88 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:19:23,558 WARN L205 SmtUtils]: Spent 8.07 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:20:00,435 WARN L205 SmtUtils]: Spent 4.12 s on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 15:20:58,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:58,307 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2021-05-02 15:20:58,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 15:20:58,308 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:20:58,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:58,309 INFO L225 Difference]: With dead ends: 87 [2021-05-02 15:20:58,309 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 15:20:58,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 77156.1ms TimeCoverageRelationStatistics Valid=67, Invalid=372, Unknown=23, NotChecked=0, Total=462 [2021-05-02 15:20:58,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 15:20:58,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 15:20:58,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 63 states have internal predecessors, (67), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 15:20:58,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2021-05-02 15:20:58,318 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 41 [2021-05-02 15:20:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:58,318 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2021-05-02 15:20:58,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:20:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2021-05-02 15:20:58,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 15:20:58,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:58,319 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:58,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:58,533 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:58,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:58,533 INFO L82 PathProgramCache]: Analyzing trace with hash -678977956, now seen corresponding path program 3 times [2021-05-02 15:20:58,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:58,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567754878] [2021-05-02 15:20:58,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:58,540 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:58,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2057430199] [2021-05-02 15:20:58,540 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true