/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:51:43,511 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:51:43,514 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:51:43,555 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:51:43,576 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:51:43,578 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:51:43,580 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:51:43,581 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:51:43,584 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:51:43,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:51:43,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:51:43,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:51:43,594 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:51:43,596 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:51:43,618 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:51:43,621 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:51:43,625 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:51:43,631 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:51:43,631 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:51:43,632 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:51:43,640 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:51:43,657 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:51:43,658 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:51:43,660 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:51:43,661 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:51:43,662 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:51:43,663 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:51:43,663 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:51:43,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:51:43,664 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:51:43,664 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:51:43,665 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:51:43,665 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:51:43,956 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:51:43,976 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:51:43,979 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:51:43,980 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:51:43,980 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:51:43,981 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-02 17:51:44,033 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505d563ba/7a1ee9441971402a8280087764ccea59/FLAG6ee001263 [2021-05-02 17:51:44,458 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:51:44,458 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-02 17:51:44,464 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505d563ba/7a1ee9441971402a8280087764ccea59/FLAG6ee001263 [2021-05-02 17:51:44,481 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505d563ba/7a1ee9441971402a8280087764ccea59 [2021-05-02 17:51:44,483 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:51:44,485 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:51:44,489 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:51:44,489 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:51:44,496 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:51:44,496 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,497 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 05:51:44, skipping insertion in model container [2021-05-02 17:51:44,498 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,504 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:51:44,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:51:44,661 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i[849,862] [2021-05-02 17:51:44,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:51:44,680 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:51:44,704 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i[849,862] [2021-05-02 17:51:44,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:51:44,744 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:51:44,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44 WrapperNode [2021-05-02 17:51:44,745 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:51:44,746 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:51:44,746 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:51:44,747 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:51:44,757 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,758 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,764 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,791 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (1/1) ... [2021-05-02 17:51:44,796 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:51:44,797 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:51:44,797 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:51:44,798 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:51:44,798 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (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 17:51:44,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:51:44,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:51:44,880 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:51:44,880 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:51:44,880 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:51:44,880 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:51:44,880 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 17:51:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:51:44,882 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:51:44,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:51:44,882 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:51:44,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:51:44,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:51:44,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:51:44,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:51:45,197 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:51:45,198 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 17:51:45,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:45 BoogieIcfgContainer [2021-05-02 17:51:45,199 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:51:45,200 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:51:45,200 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:51:45,200 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:51:45,203 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:45" (1/1) ... [2021-05-02 17:51:45,236 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:51:45 BasicIcfg [2021-05-02 17:51:45,236 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:51:45,238 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:51:45,238 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:51:45,240 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:51:45,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:51:44" (1/4) ... [2021-05-02 17:51:45,243 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42bc152b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:51:45, skipping insertion in model container [2021-05-02 17:51:45,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:44" (2/4) ... [2021-05-02 17:51:45,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42bc152b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:51:45, skipping insertion in model container [2021-05-02 17:51:45,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:45" (3/4) ... [2021-05-02 17:51:45,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42bc152b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:51:45, skipping insertion in model container [2021-05-02 17:51:45,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:51:45" (4/4) ... [2021-05-02 17:51:45,247 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.iJordan [2021-05-02 17:51:45,256 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:51:45,260 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:51:45,276 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:51:45,304 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:51:45,304 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:51:45,304 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:51:45,304 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:51:45,304 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:51:45,304 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:51:45,304 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:51:45,305 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:51:45,322 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:51:45,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:51:45,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:45,331 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:45,331 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:45,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:45,336 INFO L82 PathProgramCache]: Analyzing trace with hash -742242332, now seen corresponding path program 1 times [2021-05-02 17:51:45,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:45,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727544310] [2021-05-02 17:51:45,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:45,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:45,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:45,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:45,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:51:45,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:45,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727544310] [2021-05-02 17:51:45,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727544310] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:51:45,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:51:45,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:51:45,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682772077] [2021-05-02 17:51:45,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:51:45,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:45,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:51:45,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:51:45,641 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:45,715 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 17:51:45,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:51:45,717 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 17:51:45,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:45,725 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:51:45,725 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 17:51:45,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:51:45,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 17:51:45,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 17:51:45,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 17:51:45,754 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-02 17:51:45,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:45,754 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 17:51:45,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,755 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 17:51:45,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:51:45,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:45,756 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:45,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:51:45,756 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:45,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:45,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1029197154, now seen corresponding path program 1 times [2021-05-02 17:51:45,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:45,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554378999] [2021-05-02 17:51:45,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:45,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:45,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:45,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:45,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:51:45,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:45,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554378999] [2021-05-02 17:51:45,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554378999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:51:45,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:51:45,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:51:45,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078701254] [2021-05-02 17:51:45,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:51:45,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:45,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:51:45,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:51:45,898 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:45,958 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 17:51:45,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:51:45,959 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 17:51:45,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:45,960 INFO L225 Difference]: With dead ends: 21 [2021-05-02 17:51:45,960 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:51:45,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:51:45,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:51:45,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-02 17:51:45,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 17:51:45,964 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 17:51:45,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:45,964 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 17:51:45,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:45,964 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 17:51:45,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:51:45,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:45,965 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:45,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:51:45,965 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:45,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:45,966 INFO L82 PathProgramCache]: Analyzing trace with hash 559300038, now seen corresponding path program 1 times [2021-05-02 17:51:45,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:45,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534738319] [2021-05-02 17:51:45,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:45,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:46,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:46,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:46,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:51:46,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:46,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534738319] [2021-05-02 17:51:46,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534738319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:46,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801611603] [2021-05-02 17:51:46,025 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 17:51:46,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:46,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 17:51:46,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:46,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,164 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:51:46,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801611603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:46,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:46,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:51:46,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137355727] [2021-05-02 17:51:46,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:51:46,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:46,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:51:46,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:51:46,166 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:46,209 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-05-02 17:51:46,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:51:46,209 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 17:51:46,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:46,210 INFO L225 Difference]: With dead ends: 25 [2021-05-02 17:51:46,210 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 17:51:46,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 27.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:51:46,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 17:51:46,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 17:51:46,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-02 17:51:46,214 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-05-02 17:51:46,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:46,214 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-02 17:51:46,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,214 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-02 17:51:46,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:51:46,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:46,215 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:46,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:51:46,438 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:46,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:46,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1242233814, now seen corresponding path program 2 times [2021-05-02 17:51:46,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:46,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084020282] [2021-05-02 17:51:46,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:46,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:46,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:46,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:51:46,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:46,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084020282] [2021-05-02 17:51:46,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084020282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:46,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552880851] [2021-05-02 17:51:46,575 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 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 17:51:46,632 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:51:46,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:46,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:51:46,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:46,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:46,739 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:51:46,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552880851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:46,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:46,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:51:46,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580087302] [2021-05-02 17:51:46,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:51:46,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:46,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:51:46,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:51:46,742 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:46,820 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-05-02 17:51:46,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:51:46,820 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 17:51:46,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:46,823 INFO L225 Difference]: With dead ends: 29 [2021-05-02 17:51:46,823 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 17:51:46,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 40.2ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:51:46,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 17:51:46,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 17:51:46,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 17:51:46,834 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-05-02 17:51:46,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:46,834 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 17:51:46,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:46,834 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 17:51:46,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:51:46,835 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:46,835 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:47,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:47,058 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:47,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:47,085 INFO L82 PathProgramCache]: Analyzing trace with hash -342908786, now seen corresponding path program 3 times [2021-05-02 17:51:47,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:47,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503822460] [2021-05-02 17:51:47,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:47,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:47,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:47,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:47,177 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:51:47,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:47,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503822460] [2021-05-02 17:51:47,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503822460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:47,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467008000] [2021-05-02 17:51:47,178 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 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 17:51:47,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:51:47,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:47,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:51:47,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:47,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,335 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:51:47,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467008000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:47,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:47,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:51:47,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40675386] [2021-05-02 17:51:47,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:51:47,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:47,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:51:47,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:51:47,337 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:47,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:47,403 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2021-05-02 17:51:47,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:51:47,404 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 17:51:47,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:47,405 INFO L225 Difference]: With dead ends: 33 [2021-05-02 17:51:47,405 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 17:51:47,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 36.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:51:47,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 17:51:47,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 17:51:47,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:47,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 17:51:47,409 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-02 17:51:47,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:47,409 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 17:51:47,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:47,409 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 17:51:47,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 17:51:47,410 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:47,410 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:47,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:47,625 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:47,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:47,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1216277774, now seen corresponding path program 4 times [2021-05-02 17:51:47,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:47,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906891046] [2021-05-02 17:51:47,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:47,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:47,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:47,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:47,729 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:51:47,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:47,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906891046] [2021-05-02 17:51:47,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906891046] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:47,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337832253] [2021-05-02 17:51:47,730 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 17:51:47,796 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:51:47,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:47,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 17:51:47,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:47,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:47,901 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:51:47,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337832253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:47,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:47,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 17:51:47,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740064169] [2021-05-02 17:51:47,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:51:47,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:47,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:51:47,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:51:47,905 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:47,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:47,993 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-05-02 17:51:47,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:51:47,995 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 17:51:47,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:47,997 INFO L225 Difference]: With dead ends: 37 [2021-05-02 17:51:47,997 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 17:51:47,998 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 49.4ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:51:47,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 17:51:48,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-05-02 17:51:48,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 17:51:48,008 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2021-05-02 17:51:48,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:48,009 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 17:51:48,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,012 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 17:51:48,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:51:48,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:48,014 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:48,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:48,225 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:48,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:48,226 INFO L82 PathProgramCache]: Analyzing trace with hash -198943914, now seen corresponding path program 5 times [2021-05-02 17:51:48,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:48,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527994593] [2021-05-02 17:51:48,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:48,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:48,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,357 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:51:48,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:48,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527994593] [2021-05-02 17:51:48,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527994593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:48,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510375822] [2021-05-02 17:51:48,358 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 17:51:48,757 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:51:48,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:48,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:51:48,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:48,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,841 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:51:48,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510375822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:48,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:48,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:51:48,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346259306] [2021-05-02 17:51:48,842 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:51:48,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:48,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:51:48,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:51:48,843 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:48,902 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2021-05-02 17:51:48,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:51:48,903 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 17:51:48,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:48,903 INFO L225 Difference]: With dead ends: 41 [2021-05-02 17:51:48,903 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 17:51:48,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 75.2ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:51:48,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 17:51:48,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-05-02 17:51:48,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 17:51:48,907 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-05-02 17:51:48,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:48,907 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 17:51:48,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,907 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 17:51:48,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 17:51:48,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:48,908 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:49,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:51:49,113 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:49,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:49,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1087666618, now seen corresponding path program 6 times [2021-05-02 17:51:49,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:49,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960774590] [2021-05-02 17:51:49,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:49,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:49,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,225 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:51:49,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:49,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960774590] [2021-05-02 17:51:49,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960774590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551686599] [2021-05-02 17:51:49,226 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 17:51:49,407 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:51:49,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:49,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 17:51:49,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:49,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,523 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:51:49,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551686599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:49,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:51:49,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438348013] [2021-05-02 17:51:49,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:51:49,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:49,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:51:49,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:51:49,526 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:49,603 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-05-02 17:51:49,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:51:49,603 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 17:51:49,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:49,605 INFO L225 Difference]: With dead ends: 45 [2021-05-02 17:51:49,606 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:51:49,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 61.8ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:51:49,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:51:49,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:51:49,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 17:51:49,617 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-05-02 17:51:49,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:49,617 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 17:51:49,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,618 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 17:51:49,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 17:51:49,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:49,618 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:49,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:49,844 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:49,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:49,844 INFO L82 PathProgramCache]: Analyzing trace with hash -504599010, now seen corresponding path program 7 times [2021-05-02 17:51:49,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:49,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362941307] [2021-05-02 17:51:49,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:49,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:49,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,964 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 17:51:49,964 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:49,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362941307] [2021-05-02 17:51:49,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362941307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395125986] [2021-05-02 17:51:49,965 INFO L93 rtionOrderModulation]: Changing assertion order to 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 17:51:50,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:51:50,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:50,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,171 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 17:51:50,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395125986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:50,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:51:50,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169189535] [2021-05-02 17:51:50,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:51:50,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:50,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:51:50,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:51:50,173 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:50,271 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-05-02 17:51:50,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:51:50,272 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 17:51:50,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:50,273 INFO L225 Difference]: With dead ends: 49 [2021-05-02 17:51:50,273 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:51:50,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 64.6ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:51:50,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:51:50,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:51:50,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 17:51:50,276 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2021-05-02 17:51:50,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:50,277 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 17:51:50,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,277 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 17:51:50,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 17:51:50,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:50,278 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:50,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:50,502 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:50,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:50,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1597556606, now seen corresponding path program 8 times [2021-05-02 17:51:50,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:50,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562611983] [2021-05-02 17:51:50,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:50,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:51:50,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:50,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562611983] [2021-05-02 17:51:50,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562611983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390429368] [2021-05-02 17:51:50,624 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 17:51:50,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:51:50,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:50,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:51:50,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:50,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,787 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:51:50,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390429368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:50,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:51:50,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758226422] [2021-05-02 17:51:50,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:51:50,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:50,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:51:50,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:51:50,789 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:50,878 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-02 17:51:50,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:51:50,878 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 17:51:50,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:50,879 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:51:50,879 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 17:51:50,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 71.2ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:51:50,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 17:51:50,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 17:51:50,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 17:51:50,882 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-05-02 17:51:50,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:50,882 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 17:51:50,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,883 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 17:51:50,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 17:51:50,883 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:50,883 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:51,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:51:51,085 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:51,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:51,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1413490458, now seen corresponding path program 9 times [2021-05-02 17:51:51,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:51,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242059137] [2021-05-02 17:51:51,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:51,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:51,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:51,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:51,200 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 17:51:51,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:51,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242059137] [2021-05-02 17:51:51,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242059137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:51,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578382163] [2021-05-02 17:51:51,201 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 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 17:51:51,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:51:51,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:51,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 17:51:51,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:51,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,966 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 17:51:51,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578382163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:51,966 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:51,966 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:51:51,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595828484] [2021-05-02 17:51:51,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:51:51,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:51,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:51:51,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:51:51,968 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:52,049 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2021-05-02 17:51:52,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:51:52,050 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 17:51:52,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:52,051 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:51:52,052 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 17:51:52,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 78.4ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:51:52,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 17:51:52,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 17:51:52,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 17:51:52,067 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-02 17:51:52,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:52,067 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 17:51:52,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,068 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 17:51:52,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 17:51:52,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:52,068 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:52,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:52,285 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:52,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:52,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1982943050, now seen corresponding path program 10 times [2021-05-02 17:51:52,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:52,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65120870] [2021-05-02 17:51:52,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:52,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:52,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:52,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:52,451 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 17:51:52,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:52,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65120870] [2021-05-02 17:51:52,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65120870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:52,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553743400] [2021-05-02 17:51:52,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 17:51:52,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:51:52,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:52,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 17:51:52,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:52,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,627 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 17:51:52,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553743400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:52,627 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:52,627 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 17:51:52,627 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41373688] [2021-05-02 17:51:52,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:51:52,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:52,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:51:52,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:51:52,628 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:52,729 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-05-02 17:51:52,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:51:52,730 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 17:51:52,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:52,730 INFO L225 Difference]: With dead ends: 61 [2021-05-02 17:51:52,730 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 17:51:52,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 99.9ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:51:52,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 17:51:52,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 17:51:52,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 17:51:52,734 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2021-05-02 17:51:52,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:52,734 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 17:51:52,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,734 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 17:51:52,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 17:51:52,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:52,735 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:52,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:52,949 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:52,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:52,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1737057362, now seen corresponding path program 11 times [2021-05-02 17:51:52,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:52,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321766407] [2021-05-02 17:51:52,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:52,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:53,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,122 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:51:53,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:53,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321766407] [2021-05-02 17:51:53,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321766407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:53,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300319249] [2021-05-02 17:51:53,123 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_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 17:52:19,306 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 17:52:19,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:19,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 17:52:19,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:19,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,489 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:52:19,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300319249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:19,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:19,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:52:19,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091236918] [2021-05-02 17:52:19,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:52:19,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:19,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:52:19,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:19,492 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:19,604 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2021-05-02 17:52:19,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:52:19,605 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 17:52:19,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:19,606 INFO L225 Difference]: With dead ends: 65 [2021-05-02 17:52:19,606 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 17:52:19,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 118.2ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:19,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 17:52:19,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-05-02 17:52:19,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 17:52:19,616 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-05-02 17:52:19,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:19,616 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 17:52:19,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,616 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 17:52:19,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 17:52:19,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:19,620 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:19,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:52:19,821 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:19,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:19,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1343570414, now seen corresponding path program 12 times [2021-05-02 17:52:19,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:19,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702377484] [2021-05-02 17:52:19,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:19,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:20,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:20,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:20,011 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 17:52:20,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:20,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702377484] [2021-05-02 17:52:20,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702377484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:20,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197545872] [2021-05-02 17:52:20,012 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 17:52:27,597 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 17:52:27,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:27,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:52:27,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:27,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:52:27,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197545872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:27,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:27,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 17:52:27,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591834729] [2021-05-02 17:52:27,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:27,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:27,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:27,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:27,799 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:27,938 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2021-05-02 17:52:27,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:27,938 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 17:52:27,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:27,941 INFO L225 Difference]: With dead ends: 71 [2021-05-02 17:52:27,941 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 17:52:27,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 147.5ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:27,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 17:52:27,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 17:52:27,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 17:52:27,946 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 62 [2021-05-02 17:52:27,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:27,946 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 17:52:27,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,946 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 17:52:27,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 17:52:27,947 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:27,947 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:28,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:52:28,148 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:28,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:28,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1932819238, now seen corresponding path program 13 times [2021-05-02 17:52:28,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:28,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907287215] [2021-05-02 17:52:28,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:28,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,336 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 17:52:28,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:28,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907287215] [2021-05-02 17:52:28,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907287215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371747821] [2021-05-02 17:52:28,336 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:28,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 17:52:28,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:28,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,550 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 17:52:28,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371747821] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:28,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:52:28,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096760628] [2021-05-02 17:52:28,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:28,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:28,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:28,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:28,552 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:28,686 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2021-05-02 17:52:28,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:28,686 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 17:52:28,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:28,687 INFO L225 Difference]: With dead ends: 77 [2021-05-02 17:52:28,687 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 17:52:28,687 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 146.0ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:28,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 17:52:28,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 17:52:28,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 17:52:28,690 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-05-02 17:52:28,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:28,690 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 17:52:28,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,690 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 17:52:28,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 17:52:28,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:28,691 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:28,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:52:28,914 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:28,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:28,914 INFO L82 PathProgramCache]: Analyzing trace with hash -2047989442, now seen corresponding path program 14 times [2021-05-02 17:52:28,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:28,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600670730] [2021-05-02 17:52:28,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:28,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:29,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,143 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 17:52:29,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:29,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600670730] [2021-05-02 17:52:29,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600670730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644899570] [2021-05-02 17:52:29,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:29,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:29,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:29,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:52:29,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:29,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,373 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 17:52:29,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644899570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:29,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:52:29,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875909604] [2021-05-02 17:52:29,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:52:29,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:29,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:52:29,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:29,376 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:29,506 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2021-05-02 17:52:29,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:52:29,507 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 17:52:29,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:29,508 INFO L225 Difference]: With dead ends: 81 [2021-05-02 17:52:29,508 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 17:52:29,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 166.0ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:29,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 17:52:29,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-02 17:52:29,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 17:52:29,512 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-02 17:52:29,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:29,513 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 17:52:29,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,514 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 17:52:29,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 17:52:29,515 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:29,515 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:29,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:29,721 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:29,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:29,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1683250270, now seen corresponding path program 15 times [2021-05-02 17:52:29,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:29,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455674651] [2021-05-02 17:52:29,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:29,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:29,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,949 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 17:52:29,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:29,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455674651] [2021-05-02 17:52:29,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455674651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640928347] [2021-05-02 17:52:29,950 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:41,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 17:52:41,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:41,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:52:41,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:41,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,918 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 17:52:41,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640928347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:41,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:41,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 17:52:41,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364521208] [2021-05-02 17:52:41,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:52:41,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:41,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:52:41,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:41,920 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:42,059 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2021-05-02 17:52:42,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:52:42,059 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-02 17:52:42,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:42,060 INFO L225 Difference]: With dead ends: 85 [2021-05-02 17:52:42,060 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 17:52:42,060 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 179.1ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:42,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 17:52:42,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 17:52:42,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 17:52:42,063 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2021-05-02 17:52:42,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:42,063 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 17:52:42,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,063 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 17:52:42,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 17:52:42,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:42,063 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:42,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:52:42,264 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:42,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:42,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1537281018, now seen corresponding path program 16 times [2021-05-02 17:52:42,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:42,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447389408] [2021-05-02 17:52:42,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:42,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:42,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:42,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:42,516 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 17:52:42,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:42,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447389408] [2021-05-02 17:52:42,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447389408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:42,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685423278] [2021-05-02 17:52:42,517 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:42,599 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:42,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:42,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:52:42,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:42,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,762 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 17:52:42,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685423278] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:42,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:42,763 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 17:52:42,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285659054] [2021-05-02 17:52:42,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 17:52:42,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:42,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 17:52:42,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:42,764 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:42,903 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2021-05-02 17:52:42,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 17:52:42,904 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-02 17:52:42,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:42,904 INFO L225 Difference]: With dead ends: 89 [2021-05-02 17:52:42,904 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 17:52:42,905 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 194.5ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:42,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 17:52:42,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-02 17:52:42,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 17:52:42,907 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-05-02 17:52:42,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:42,907 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 17:52:42,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,908 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 17:52:42,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 17:52:42,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:42,908 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:43,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:52:43,121 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:43,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:43,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1151133078, now seen corresponding path program 17 times [2021-05-02 17:52:43,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:43,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737014330] [2021-05-02 17:52:43,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:43,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:43,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,388 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-05-02 17:52:43,388 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:43,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737014330] [2021-05-02 17:52:43,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737014330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:43,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22656626] [2021-05-02 17:52:43,389 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true