/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-crafted/simple_array_index_value_1-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:52:10,854 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:52:10,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:52:10,887 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 05:52:10,931 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:52:10,931 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:52:10,932 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:52:10,932 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 05:52:10,957 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:52:10,957 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:52:10,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:52:10,960 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:52:10,961 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:52:10,961 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:52:10,961 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:52:10,961 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:52:10,961 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:52:10,962 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:52:10,962 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 05:52:10,962 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:52:10,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:52:10,962 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:52:10,962 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:52:10,963 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 05:52:10,963 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:52:11,199 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:52:11,212 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:52:11,213 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:52:11,214 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:52:11,214 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:52:11,215 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i [2021-05-06 05:52:11,278 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86487456d/afb26b64b798444296a67221bb0465d7/FLAG6472de127 [2021-05-06 05:52:11,685 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:52:11,685 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i [2021-05-06 05:52:11,689 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86487456d/afb26b64b798444296a67221bb0465d7/FLAG6472de127 [2021-05-06 05:52:11,703 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86487456d/afb26b64b798444296a67221bb0465d7 [2021-05-06 05:52:11,705 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:52:11,707 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 05:52:11,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:52:11,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:52:11,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:52:11,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f70c431 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11, skipping insertion in model container [2021-05-06 05:52:11,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,720 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:52:11,730 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:52:11,839 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-crafted/simple_array_index_value_1-1.i[834,847] [2021-05-06 05:52:11,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:52:11,859 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:52:11,868 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-crafted/simple_array_index_value_1-1.i[834,847] [2021-05-06 05:52:11,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:52:11,921 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:52:11,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11 WrapperNode [2021-05-06 05:52:11,922 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:52:11,923 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:52:11,923 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:52:11,923 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:52:11,930 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,930 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,937 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,946 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,949 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,950 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... [2021-05-06 05:52:11,954 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:52:11,955 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:52:11,956 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:52:11,956 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:52:11,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:52:12,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:52:12,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:52:12,084 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:52:12,084 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:52:12,084 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:52:12,084 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:52:12,084 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:52:12,084 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:52:12,085 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:52:12,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:52:12,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:52:12,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:52:12,315 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:52:12,315 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 05:52:12,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:52:12 BoogieIcfgContainer [2021-05-06 05:52:12,316 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:52:12,317 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 05:52:12,317 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 05:52:12,317 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 05:52:12,319 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:52:12" (1/1) ... [2021-05-06 05:52:12,327 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 05:52:12 BasicIcfg [2021-05-06 05:52:12,327 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 05:52:12,328 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:52:12,328 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:52:12,330 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:52:12,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:52:11" (1/4) ... [2021-05-06 05:52:12,330 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65d39874 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:52:12, skipping insertion in model container [2021-05-06 05:52:12,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:52:11" (2/4) ... [2021-05-06 05:52:12,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65d39874 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:52:12, skipping insertion in model container [2021-05-06 05:52:12,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:52:12" (3/4) ... [2021-05-06 05:52:12,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65d39874 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 05:52:12, skipping insertion in model container [2021-05-06 05:52:12,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 05:52:12" (4/4) ... [2021-05-06 05:52:12,332 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_1-1.iJordan [2021-05-06 05:52:12,335 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:52:12,337 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:52:12,347 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:52:12,358 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:52:12,358 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 05:52:12,358 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 05:52:12,358 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:52:12,358 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:52:12,358 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:52:12,358 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:52:12,358 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:52:12,366 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:52:12,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 05:52:12,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:12,370 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:12,370 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:12,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:12,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1599893512, now seen corresponding path program 1 times [2021-05-06 05:52:12,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:12,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322081094] [2021-05-06 05:52:12,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:12,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:12,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:52:12,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:12,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322081094] [2021-05-06 05:52:12,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322081094] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:52:12,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:52:12,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:52:12,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111643716] [2021-05-06 05:52:12,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:52:12,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:12,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:52:12,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:52:12,526 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 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) [2021-05-06 05:52:12,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:12,573 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2021-05-06 05:52:12,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:52:12,575 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 [2021-05-06 05:52:12,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:12,579 INFO L225 Difference]: With dead ends: 27 [2021-05-06 05:52:12,579 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 05:52:12,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:52:12,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 05:52:12,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-06 05:52:12,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:52:12,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-05-06 05:52:12,603 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2021-05-06 05:52:12,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:12,603 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-05-06 05:52:12,604 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) [2021-05-06 05:52:12,604 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-05-06 05:52:12,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 05:52:12,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:12,605 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:12,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:52:12,605 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:12,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:12,606 INFO L82 PathProgramCache]: Analyzing trace with hash -952263449, now seen corresponding path program 1 times [2021-05-06 05:52:12,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:12,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139850180] [2021-05-06 05:52:12,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:12,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:12,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:52:12,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:12,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139850180] [2021-05-06 05:52:12,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139850180] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:52:12,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:52:12,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 05:52:12,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878797823] [2021-05-06 05:52:12,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 05:52:12,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:12,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 05:52:12,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:52:12,674 INFO L87 Difference]: Start difference. First operand 22 states and 25 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) [2021-05-06 05:52:12,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:12,761 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-05-06 05:52:12,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 05:52:12,761 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 [2021-05-06 05:52:12,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:12,762 INFO L225 Difference]: With dead ends: 29 [2021-05-06 05:52:12,762 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 05:52:12,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:52:12,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 05:52:12,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-05-06 05:52:12,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:52:12,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 05:52:12,766 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 14 [2021-05-06 05:52:12,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:12,766 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 05:52:12,766 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) [2021-05-06 05:52:12,767 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 05:52:12,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 05:52:12,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:12,767 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:12,767 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 05:52:12,767 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:12,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:12,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1051990743, now seen corresponding path program 1 times [2021-05-06 05:52:12,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:12,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870771672] [2021-05-06 05:52:12,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:12,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:12,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:52:12,867 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:12,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870771672] [2021-05-06 05:52:12,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870771672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:12,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783784729] [2021-05-06 05:52:12,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:12,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:12,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 05:52:12,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:12,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:12,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:12,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:12,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-05-06 05:52:12,976 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-06 05:52:12,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 05:52:12,978 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-06 05:52:12,978 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2021-05-06 05:52:13,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:13,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:13,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-05-06 05:52:13,020 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-06 05:52:13,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 05:52:13,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-06 05:52:13,022 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2021-05-06 05:52:13,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:13,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:52:13,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783784729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:13,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:13,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8] total 10 [2021-05-06 05:52:13,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469496819] [2021-05-06 05:52:13,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:52:13,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:13,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:52:13,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:52:13,053 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:52:13,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:13,206 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-06 05:52:13,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:52:13,206 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 05:52:13,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:13,208 INFO L225 Difference]: With dead ends: 40 [2021-05-06 05:52:13,208 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 05:52:13,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 123.9ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:52:13,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 05:52:13,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2021-05-06 05:52:13,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:52:13,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-06 05:52:13,222 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 16 [2021-05-06 05:52:13,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:13,222 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-06 05:52:13,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:52:13,222 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-06 05:52:13,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 05:52:13,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:13,223 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:13,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 05:52:13,440 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:13,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:13,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1683413027, now seen corresponding path program 1 times [2021-05-06 05:52:13,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:13,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088417472] [2021-05-06 05:52:13,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:13,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:13,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:13,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:13,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 05:52:13,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:13,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:13,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:13,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088417472] [2021-05-06 05:52:13,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088417472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:13,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497813338] [2021-05-06 05:52:13,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:13,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:13,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 05:52:13,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:13,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:13,694 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:13,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497813338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:13,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:13,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 05:52:13,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163466475] [2021-05-06 05:52:13,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:52:13,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:13,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:52:13,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:52:13,695 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:13,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:13,776 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2021-05-06 05:52:13,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:52:13,776 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-06 05:52:13,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:13,777 INFO L225 Difference]: With dead ends: 47 [2021-05-06 05:52:13,777 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 05:52:13,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 40.2ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:52:13,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 05:52:13,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-05-06 05:52:13,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 05:52:13,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-06 05:52:13,781 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 27 [2021-05-06 05:52:13,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:13,781 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-06 05:52:13,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:13,781 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-06 05:52:13,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 05:52:13,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:13,782 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:13,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:13,997 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:13,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:13,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1290504993, now seen corresponding path program 2 times [2021-05-06 05:52:13,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:13,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49488185] [2021-05-06 05:52:13,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:14,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:14,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 05:52:14,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,072 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:14,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:14,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49488185] [2021-05-06 05:52:14,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49488185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:14,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690369307] [2021-05-06 05:52:14,072 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:14,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:52:14,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:14,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 05:52:14,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:14,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:14,178 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:14,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690369307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:14,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:14,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-06 05:52:14,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651092983] [2021-05-06 05:52:14,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 05:52:14,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:14,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 05:52:14,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:52:14,179 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:14,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:14,301 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2021-05-06 05:52:14,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:52:14,301 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-06 05:52:14,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:14,302 INFO L225 Difference]: With dead ends: 54 [2021-05-06 05:52:14,302 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:52:14,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:52:14,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:52:14,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2021-05-06 05:52:14,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:52:14,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-05-06 05:52:14,306 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 29 [2021-05-06 05:52:14,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:14,306 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-05-06 05:52:14,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:14,306 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-05-06 05:52:14,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 05:52:14,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:14,306 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:14,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:14,512 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:14,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:14,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1663006367, now seen corresponding path program 3 times [2021-05-06 05:52:14,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:14,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348772187] [2021-05-06 05:52:14,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:14,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:14,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-06 05:52:14,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:14,602 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:14,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:14,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348772187] [2021-05-06 05:52:14,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348772187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:14,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823510430] [2021-05-06 05:52:14,602 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:14,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-06 05:52:14,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:14,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:52:14,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:14,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:14,748 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:14,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823510430] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:14,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:14,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-06 05:52:14,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224195691] [2021-05-06 05:52:14,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:52:14,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:14,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:52:14,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:52:14,749 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:14,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:14,888 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2021-05-06 05:52:14,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:52:14,888 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-05-06 05:52:14,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:14,890 INFO L225 Difference]: With dead ends: 61 [2021-05-06 05:52:14,890 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 05:52:14,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 49.7ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:52:14,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 05:52:14,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2021-05-06 05:52:14,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:52:14,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-05-06 05:52:14,907 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 31 [2021-05-06 05:52:14,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:14,907 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-05-06 05:52:14,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:14,907 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-05-06 05:52:14,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 05:52:14,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:14,908 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:15,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:15,114 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:15,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:15,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1140426083, now seen corresponding path program 4 times [2021-05-06 05:52:15,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:15,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009475449] [2021-05-06 05:52:15,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:15,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:15,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-06 05:52:15,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,225 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:15,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:15,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009475449] [2021-05-06 05:52:15,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009475449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:15,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90659784] [2021-05-06 05:52:15,225 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:15,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:52:15,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:15,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 05:52:15,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:15,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:15,386 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:15,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90659784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:15,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:15,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 05:52:15,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850932035] [2021-05-06 05:52:15,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:52:15,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:15,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:52:15,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:52:15,389 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:15,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:15,545 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2021-05-06 05:52:15,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 05:52:15,545 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2021-05-06 05:52:15,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:15,547 INFO L225 Difference]: With dead ends: 68 [2021-05-06 05:52:15,547 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 05:52:15,547 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 69.6ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:52:15,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 05:52:15,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2021-05-06 05:52:15,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 states have internal predecessors, (54), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:52:15,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-06 05:52:15,561 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 33 [2021-05-06 05:52:15,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:15,561 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-06 05:52:15,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:15,562 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-06 05:52:15,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 05:52:15,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:15,563 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:15,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 05:52:15,778 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:15,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:15,778 INFO L82 PathProgramCache]: Analyzing trace with hash 2000451355, now seen corresponding path program 5 times [2021-05-06 05:52:15,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:15,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864141189] [2021-05-06 05:52:15,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:15,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:15,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-06 05:52:15,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:15,864 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:15,864 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:15,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864141189] [2021-05-06 05:52:15,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864141189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:15,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858580258] [2021-05-06 05:52:15,864 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:16,128 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-06 05:52:16,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:16,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 05:52:16,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:16,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:16,197 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:16,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858580258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:16,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:16,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 05:52:16,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417507447] [2021-05-06 05:52:16,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:52:16,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:16,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:52:16,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:52:16,198 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:16,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:16,392 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2021-05-06 05:52:16,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:52:16,392 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-06 05:52:16,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:16,393 INFO L225 Difference]: With dead ends: 75 [2021-05-06 05:52:16,393 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 05:52:16,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 61.3ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:52:16,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 05:52:16,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 71. [2021-05-06 05:52:16,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:52:16,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 79 transitions. [2021-05-06 05:52:16,396 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 79 transitions. Word has length 35 [2021-05-06 05:52:16,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:16,396 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 79 transitions. [2021-05-06 05:52:16,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:16,396 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 79 transitions. [2021-05-06 05:52:16,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 05:52:16,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:16,397 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:16,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:16,602 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:16,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:16,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1021660185, now seen corresponding path program 6 times [2021-05-06 05:52:16,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:16,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663985041] [2021-05-06 05:52:16,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:16,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:16,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:16,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:16,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-06 05:52:16,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:16,703 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:16,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663985041] [2021-05-06 05:52:16,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663985041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:16,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218749187] [2021-05-06 05:52:16,704 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:16,917 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-06 05:52:16,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:16,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 05:52:16,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:16,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:16,985 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:16,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218749187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:16,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:16,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 05:52:16,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933907086] [2021-05-06 05:52:16,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:52:16,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:16,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:52:16,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:52:16,986 INFO L87 Difference]: Start difference. First operand 71 states and 79 transitions. Second operand has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:17,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:17,234 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-05-06 05:52:17,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 05:52:17,234 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-06 05:52:17,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:17,237 INFO L225 Difference]: With dead ends: 82 [2021-05-06 05:52:17,237 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 05:52:17,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 76.6ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:52:17,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 05:52:17,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2021-05-06 05:52:17,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:52:17,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 87 transitions. [2021-05-06 05:52:17,244 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 87 transitions. Word has length 37 [2021-05-06 05:52:17,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:17,244 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 87 transitions. [2021-05-06 05:52:17,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:17,244 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 87 transitions. [2021-05-06 05:52:17,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 05:52:17,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:17,247 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:17,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:17,452 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:17,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:17,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1001183639, now seen corresponding path program 7 times [2021-05-06 05:52:17,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:17,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682106895] [2021-05-06 05:52:17,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:17,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:17,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:17,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:17,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-06 05:52:17,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:17,563 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:17,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:17,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682106895] [2021-05-06 05:52:17,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682106895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:17,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746793292] [2021-05-06 05:52:17,564 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 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 [2021-05-06 05:52:17,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:17,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 05:52:17,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:17,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:17,714 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:17,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746793292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:17,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:17,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-06 05:52:17,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139261287] [2021-05-06 05:52:17,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:52:17,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:17,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:52:17,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:52:17,715 INFO L87 Difference]: Start difference. First operand 78 states and 87 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:17,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:17,986 INFO L93 Difference]: Finished difference Result 89 states and 100 transitions. [2021-05-06 05:52:17,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:52:17,987 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-06 05:52:17,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:17,987 INFO L225 Difference]: With dead ends: 89 [2021-05-06 05:52:17,987 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 05:52:17,987 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 114.8ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:52:17,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 05:52:17,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2021-05-06 05:52:17,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:52:17,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2021-05-06 05:52:17,991 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 39 [2021-05-06 05:52:17,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:17,991 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2021-05-06 05:52:17,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:17,991 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2021-05-06 05:52:17,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 05:52:17,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:17,991 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:18,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:52:18,209 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:18,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:18,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1496907883, now seen corresponding path program 8 times [2021-05-06 05:52:18,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:18,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762193392] [2021-05-06 05:52:18,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:18,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:18,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:18,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:18,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-06 05:52:18,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:18,345 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:18,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:18,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762193392] [2021-05-06 05:52:18,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762193392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:18,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755534508] [2021-05-06 05:52:18,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:18,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:52:18,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:18,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 05:52:18,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:18,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:18,495 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:18,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755534508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:18,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:18,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 05:52:18,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558410637] [2021-05-06 05:52:18,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:52:18,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:18,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:52:18,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:52:18,496 INFO L87 Difference]: Start difference. First operand 85 states and 95 transitions. Second operand has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:18,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:18,814 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2021-05-06 05:52:18,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 05:52:18,815 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-05-06 05:52:18,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:18,816 INFO L225 Difference]: With dead ends: 96 [2021-05-06 05:52:18,816 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 05:52:18,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 8 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 152.6ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:52:18,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 05:52:18,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2021-05-06 05:52:18,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 75 states have (on average 1.04) internal successors, (78), 75 states have internal predecessors, (78), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:52:18,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 103 transitions. [2021-05-06 05:52:18,821 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 103 transitions. Word has length 41 [2021-05-06 05:52:18,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:18,821 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 103 transitions. [2021-05-06 05:52:18,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:18,821 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 103 transitions. [2021-05-06 05:52:18,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 05:52:18,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:18,821 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:19,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:19,033 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:19,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:19,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1276142061, now seen corresponding path program 9 times [2021-05-06 05:52:19,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:19,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199313131] [2021-05-06 05:52:19,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:19,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:19,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:19,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:19,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-06 05:52:19,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:19,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:19,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199313131] [2021-05-06 05:52:19,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199313131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:19,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427154735] [2021-05-06 05:52:19,208 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 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 [2021-05-06 05:52:19,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-06 05:52:19,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:19,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 05:52:19,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:20,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:20,034 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:20,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427154735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:20,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:20,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-06 05:52:20,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671943713] [2021-05-06 05:52:20,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 05:52:20,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:20,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 05:52:20,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:52:20,035 INFO L87 Difference]: Start difference. First operand 92 states and 103 transitions. Second operand has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:20,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:20,439 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2021-05-06 05:52:20,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:52:20,440 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-06 05:52:20,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:20,440 INFO L225 Difference]: With dead ends: 103 [2021-05-06 05:52:20,441 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 05:52:20,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 116.0ms TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:52:20,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 05:52:20,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2021-05-06 05:52:20,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:52:20,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 111 transitions. [2021-05-06 05:52:20,443 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 111 transitions. Word has length 43 [2021-05-06 05:52:20,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:20,444 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 111 transitions. [2021-05-06 05:52:20,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:20,444 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 111 transitions. [2021-05-06 05:52:20,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 05:52:20,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:20,444 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:20,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:20,650 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:20,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:20,650 INFO L82 PathProgramCache]: Analyzing trace with hash 426415377, now seen corresponding path program 10 times [2021-05-06 05:52:20,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:20,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121324326] [2021-05-06 05:52:20,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:20,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:20,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:20,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:20,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-06 05:52:20,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:20,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:20,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121324326] [2021-05-06 05:52:20,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121324326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:20,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479167376] [2021-05-06 05:52:20,800 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 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 [2021-05-06 05:52:20,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:52:20,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:20,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-06 05:52:20,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:20,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:20,947 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:20,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479167376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:20,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:20,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-06 05:52:20,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701255449] [2021-05-06 05:52:20,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 05:52:20,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:20,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 05:52:20,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:52:20,949 INFO L87 Difference]: Start difference. First operand 99 states and 111 transitions. Second operand has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:21,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:21,380 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2021-05-06 05:52:21,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 05:52:21,380 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-05-06 05:52:21,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:21,381 INFO L225 Difference]: With dead ends: 110 [2021-05-06 05:52:21,381 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 05:52:21,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 135.5ms TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:52:21,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 05:52:21,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2021-05-06 05:52:21,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 15 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 05:52:21,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 119 transitions. [2021-05-06 05:52:21,384 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 119 transitions. Word has length 45 [2021-05-06 05:52:21,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:21,385 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 119 transitions. [2021-05-06 05:52:21,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:21,385 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 119 transitions. [2021-05-06 05:52:21,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 05:52:21,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:21,385 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:21,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 05:52:21,597 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:21,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:21,597 INFO L82 PathProgramCache]: Analyzing trace with hash 201573519, now seen corresponding path program 11 times [2021-05-06 05:52:21,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:21,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235600317] [2021-05-06 05:52:21,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:21,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:21,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:21,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:21,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-06 05:52:21,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:21,810 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:21,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:21,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235600317] [2021-05-06 05:52:21,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235600317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:21,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826325287] [2021-05-06 05:52:21,811 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 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 [2021-05-06 05:52:25,953 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-06 05:52:25,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:25,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 05:52:25,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:26,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:26,077 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:26,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826325287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:26,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:26,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-06 05:52:26,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178528820] [2021-05-06 05:52:26,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 05:52:26,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:26,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 05:52:26,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 05:52:26,079 INFO L87 Difference]: Start difference. First operand 106 states and 119 transitions. Second operand has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:26,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:26,778 INFO L93 Difference]: Finished difference Result 117 states and 132 transitions. [2021-05-06 05:52:26,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 05:52:26,779 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-05-06 05:52:26,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:26,779 INFO L225 Difference]: With dead ends: 117 [2021-05-06 05:52:26,780 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 05:52:26,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 188.1ms TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 05:52:26,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 05:52:26,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2021-05-06 05:52:26,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 93 states have (on average 1.032258064516129) internal successors, (96), 93 states have internal predecessors, (96), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 05:52:26,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 127 transitions. [2021-05-06 05:52:26,783 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 127 transitions. Word has length 47 [2021-05-06 05:52:26,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:26,783 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 127 transitions. [2021-05-06 05:52:26,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:26,783 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 127 transitions. [2021-05-06 05:52:26,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 05:52:26,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:26,784 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:26,990 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 05:52:26,990 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:26,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:26,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1123087219, now seen corresponding path program 12 times [2021-05-06 05:52:26,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:26,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347152957] [2021-05-06 05:52:26,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:27,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:27,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:27,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:27,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-06 05:52:27,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:27,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:27,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347152957] [2021-05-06 05:52:27,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347152957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:27,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033367258] [2021-05-06 05:52:27,209 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 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 [2021-05-06 05:52:30,843 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-05-06 05:52:30,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:30,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 05:52:30,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:30,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:30,967 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:30,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033367258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:30,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:30,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 05:52:30,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475520349] [2021-05-06 05:52:30,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 05:52:30,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:30,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 05:52:30,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:52:30,969 INFO L87 Difference]: Start difference. First operand 113 states and 127 transitions. Second operand has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:31,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:31,554 INFO L93 Difference]: Finished difference Result 124 states and 140 transitions. [2021-05-06 05:52:31,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 05:52:31,554 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2021-05-06 05:52:31,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:31,555 INFO L225 Difference]: With dead ends: 124 [2021-05-06 05:52:31,555 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 05:52:31,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 182.9ms TimeCoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:52:31,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 05:52:31,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2021-05-06 05:52:31,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 99 states have internal predecessors, (102), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 05:52:31,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 135 transitions. [2021-05-06 05:52:31,558 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 135 transitions. Word has length 49 [2021-05-06 05:52:31,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:31,558 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 135 transitions. [2021-05-06 05:52:31,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:31,558 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 135 transitions. [2021-05-06 05:52:31,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 05:52:31,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:31,559 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:31,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 05:52:31,759 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:31,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:31,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1483230475, now seen corresponding path program 13 times [2021-05-06 05:52:31,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:31,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467406772] [2021-05-06 05:52:31,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:31,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:31,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:31,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-06 05:52:31,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:31,961 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:31,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:31,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467406772] [2021-05-06 05:52:31,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467406772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:31,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888849168] [2021-05-06 05:52:31,961 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 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 [2021-05-06 05:52:32,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:32,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-06 05:52:32,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:32,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:32,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888849168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:32,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:32,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 05:52:32,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66973020] [2021-05-06 05:52:32,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 05:52:32,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:32,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 05:52:32,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:52:32,149 INFO L87 Difference]: Start difference. First operand 120 states and 135 transitions. Second operand has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:32,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:32,781 INFO L93 Difference]: Finished difference Result 131 states and 148 transitions. [2021-05-06 05:52:32,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:52:32,781 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2021-05-06 05:52:32,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:32,782 INFO L225 Difference]: With dead ends: 131 [2021-05-06 05:52:32,782 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 05:52:32,782 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 8 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 207.7ms TimeCoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:52:32,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 05:52:32,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 127. [2021-05-06 05:52:32,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 105 states have (on average 1.0285714285714285) internal successors, (108), 105 states have internal predecessors, (108), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 05:52:32,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-06 05:52:32,785 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 51 [2021-05-06 05:52:32,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:32,785 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-06 05:52:32,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:32,786 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-06 05:52:32,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 05:52:32,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:32,786 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:33,001 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:33,001 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:33,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:33,001 INFO L82 PathProgramCache]: Analyzing trace with hash -2106366455, now seen corresponding path program 14 times [2021-05-06 05:52:33,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:33,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277901949] [2021-05-06 05:52:33,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:33,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:33,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:33,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:33,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 05:52:33,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:33,215 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:33,216 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:33,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277901949] [2021-05-06 05:52:33,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277901949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:33,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180639727] [2021-05-06 05:52:33,216 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 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 [2021-05-06 05:52:33,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:52:33,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:33,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-06 05:52:33,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:33,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:33,421 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:33,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180639727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:33,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:33,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 05:52:33,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191143384] [2021-05-06 05:52:33,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 05:52:33,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:33,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 05:52:33,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:52:33,422 INFO L87 Difference]: Start difference. First operand 127 states and 143 transitions. Second operand has 20 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:34,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:34,152 INFO L93 Difference]: Finished difference Result 138 states and 156 transitions. [2021-05-06 05:52:34,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 05:52:34,153 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2021-05-06 05:52:34,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:34,154 INFO L225 Difference]: With dead ends: 138 [2021-05-06 05:52:34,154 INFO L226 Difference]: Without dead ends: 138 [2021-05-06 05:52:34,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 243.6ms TimeCoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:52:34,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-06 05:52:34,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 134. [2021-05-06 05:52:34,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 states have internal predecessors, (114), 19 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 05:52:34,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 151 transitions. [2021-05-06 05:52:34,157 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 151 transitions. Word has length 53 [2021-05-06 05:52:34,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:34,157 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 151 transitions. [2021-05-06 05:52:34,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 19 states have internal predecessors, (51), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:34,157 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 151 transitions. [2021-05-06 05:52:34,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 05:52:34,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:34,158 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:34,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 05:52:34,363 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:34,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:34,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1444689799, now seen corresponding path program 15 times [2021-05-06 05:52:34,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:34,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27685306] [2021-05-06 05:52:34,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:34,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:34,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:34,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-06 05:52:34,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:34,615 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:34,616 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:34,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27685306] [2021-05-06 05:52:34,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27685306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:34,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717579327] [2021-05-06 05:52:34,616 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 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 [2021-05-06 05:52:44,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-06 05:52:44,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:44,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 05:52:44,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:44,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:44,717 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:44,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717579327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:44,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:44,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-06 05:52:44,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560569005] [2021-05-06 05:52:44,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 05:52:44,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:44,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 05:52:44,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-06 05:52:44,718 INFO L87 Difference]: Start difference. First operand 134 states and 151 transitions. Second operand has 21 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:45,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:45,515 INFO L93 Difference]: Finished difference Result 145 states and 164 transitions. [2021-05-06 05:52:45,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 05:52:45,515 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2021-05-06 05:52:45,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:45,516 INFO L225 Difference]: With dead ends: 145 [2021-05-06 05:52:45,516 INFO L226 Difference]: Without dead ends: 145 [2021-05-06 05:52:45,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 253.6ms TimeCoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-06 05:52:45,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-06 05:52:45,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2021-05-06 05:52:45,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 20 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 05:52:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 159 transitions. [2021-05-06 05:52:45,519 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 159 transitions. Word has length 55 [2021-05-06 05:52:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:45,519 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 159 transitions. [2021-05-06 05:52:45,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:45,520 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 159 transitions. [2021-05-06 05:52:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 05:52:45,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:45,520 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:45,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 05:52:45,725 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:45,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:45,726 INFO L82 PathProgramCache]: Analyzing trace with hash -489250427, now seen corresponding path program 16 times [2021-05-06 05:52:45,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:45,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261141100] [2021-05-06 05:52:45,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:45,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:45,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:45,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:45,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-06 05:52:45,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:45,984 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:45,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:45,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261141100] [2021-05-06 05:52:45,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261141100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:45,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761766162] [2021-05-06 05:52:45,984 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 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 [2021-05-06 05:52:46,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:52:46,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:52:46,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 05:52:46,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:52:46,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:52:46,253 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:52:46,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761766162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:46,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:52:46,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-06 05:52:46,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495506564] [2021-05-06 05:52:46,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 05:52:46,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:52:46,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 05:52:46,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:52:46,255 INFO L87 Difference]: Start difference. First operand 141 states and 159 transitions. Second operand has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:46,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:52:46,986 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2021-05-06 05:52:46,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 05:52:46,987 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 57 [2021-05-06 05:52:46,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:52:46,987 INFO L225 Difference]: With dead ends: 152 [2021-05-06 05:52:46,987 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 05:52:46,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 17 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 308.2ms TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:52:46,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 05:52:47,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 148. [2021-05-06 05:52:47,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 123 states have (on average 1.024390243902439) internal successors, (126), 123 states have internal predecessors, (126), 21 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 05:52:47,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 167 transitions. [2021-05-06 05:52:47,017 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 167 transitions. Word has length 57 [2021-05-06 05:52:47,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:52:47,017 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 167 transitions. [2021-05-06 05:52:47,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:52:47,017 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 167 transitions. [2021-05-06 05:52:47,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 05:52:47,019 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:52:47,019 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:52:47,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:52:47,220 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:52:47,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:52:47,220 INFO L82 PathProgramCache]: Analyzing trace with hash 715031555, now seen corresponding path program 17 times [2021-05-06 05:52:47,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:52:47,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429373014] [2021-05-06 05:52:47,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:52:47,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:47,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:52:47,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:47,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 05:52:47,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:52:47,423 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:52:47,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:52:47,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429373014] [2021-05-06 05:52:47,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429373014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:52:47,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368153405] [2021-05-06 05:52:47,423 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:53:17,086 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-06 05:53:17,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:53:17,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-06 05:53:17,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:53:17,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:53:17,178 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:53:17,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368153405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:53:17,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:53:17,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-06 05:53:17,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759238518] [2021-05-06 05:53:17,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 05:53:17,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:53:17,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 05:53:17,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 05:53:17,180 INFO L87 Difference]: Start difference. First operand 148 states and 167 transitions. Second operand has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:53:18,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:53:18,060 INFO L93 Difference]: Finished difference Result 159 states and 180 transitions. [2021-05-06 05:53:18,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 05:53:18,060 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2021-05-06 05:53:18,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:53:18,075 INFO L225 Difference]: With dead ends: 159 [2021-05-06 05:53:18,075 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 05:53:18,075 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 141.1ms TimeCoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 05:53:18,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 05:53:18,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2021-05-06 05:53:18,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 22 states have call successors, (22), 4 states have call predecessors, (22), 3 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 05:53:18,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 175 transitions. [2021-05-06 05:53:18,086 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 175 transitions. Word has length 59 [2021-05-06 05:53:18,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:53:18,086 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 175 transitions. [2021-05-06 05:53:18,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:53:18,086 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 175 transitions. [2021-05-06 05:53:18,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 05:53:18,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:53:18,086 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:53:18,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:53:18,287 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:53:18,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:53:18,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1611153663, now seen corresponding path program 18 times [2021-05-06 05:53:18,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:53:18,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099713828] [2021-05-06 05:53:18,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:53:18,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:53:18,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:53:18,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:53:18,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 05:53:18,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:53:18,670 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:53:18,670 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:53:18,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099713828] [2021-05-06 05:53:18,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099713828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:53:18,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556754945] [2021-05-06 05:53:18,671 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:00,119 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2021-05-06 05:54:00,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:54:00,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-06 05:54:00,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:54:00,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:54:00,264 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:54:00,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556754945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:00,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:54:00,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-06 05:54:00,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025963816] [2021-05-06 05:54:00,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 05:54:00,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:54:00,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 05:54:00,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-06 05:54:00,265 INFO L87 Difference]: Start difference. First operand 155 states and 175 transitions. Second operand has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:01,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:54:01,273 INFO L93 Difference]: Finished difference Result 166 states and 188 transitions. [2021-05-06 05:54:01,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 05:54:01,274 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 61 [2021-05-06 05:54:01,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:54:01,274 INFO L225 Difference]: With dead ends: 166 [2021-05-06 05:54:01,274 INFO L226 Difference]: Without dead ends: 166 [2021-05-06 05:54:01,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 321.0ms TimeCoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-06 05:54:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-06 05:54:01,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2021-05-06 05:54:01,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 135 states have internal predecessors, (138), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-06 05:54:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 183 transitions. [2021-05-06 05:54:01,278 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 183 transitions. Word has length 61 [2021-05-06 05:54:01,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:54:01,278 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 183 transitions. [2021-05-06 05:54:01,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:01,279 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 183 transitions. [2021-05-06 05:54:01,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 05:54:01,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:54:01,279 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:54:01,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:01,490 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:54:01,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:54:01,490 INFO L82 PathProgramCache]: Analyzing trace with hash 602813055, now seen corresponding path program 19 times [2021-05-06 05:54:01,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:54:01,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932045222] [2021-05-06 05:54:01,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:54:01,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:01,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:54:01,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:01,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 05:54:01,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:01,775 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:54:01,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:54:01,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932045222] [2021-05-06 05:54:01,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932045222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:01,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679525770] [2021-05-06 05:54:01,775 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:01,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:01,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-06 05:54:01,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:54:01,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:54:02,005 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:54:02,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679525770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:02,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:54:02,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-06 05:54:02,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053930939] [2021-05-06 05:54:02,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 05:54:02,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:54:02,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 05:54:02,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 05:54:02,007 INFO L87 Difference]: Start difference. First operand 162 states and 183 transitions. Second operand has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:02,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:54:02,712 INFO L93 Difference]: Finished difference Result 173 states and 196 transitions. [2021-05-06 05:54:02,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 05:54:02,713 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 63 [2021-05-06 05:54:02,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:54:02,714 INFO L225 Difference]: With dead ends: 173 [2021-05-06 05:54:02,714 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 05:54:02,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 52 SyntacticMatches, 14 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 329.2ms TimeCoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 05:54:02,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 05:54:02,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 169. [2021-05-06 05:54:02,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 141 states have (on average 1.0212765957446808) internal successors, (144), 141 states have internal predecessors, (144), 24 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-06 05:54:02,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2021-05-06 05:54:02,738 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 63 [2021-05-06 05:54:02,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:54:02,738 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2021-05-06 05:54:02,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:02,739 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2021-05-06 05:54:02,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 05:54:02,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:54:02,739 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:54:02,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 05:54:02,942 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:54:02,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:54:02,942 INFO L82 PathProgramCache]: Analyzing trace with hash -2078949763, now seen corresponding path program 20 times [2021-05-06 05:54:02,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:54:02,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125335211] [2021-05-06 05:54:02,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:54:02,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:03,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:54:03,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:03,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 05:54:03,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:03,247 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:54:03,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:54:03,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125335211] [2021-05-06 05:54:03,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125335211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:03,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589757120] [2021-05-06 05:54:03,247 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:03,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:54:03,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:54:03,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-06 05:54:03,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:54:03,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:54:03,650 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:54:03,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589757120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:03,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:54:03,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-06 05:54:03,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321705808] [2021-05-06 05:54:03,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 05:54:03,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:54:03,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 05:54:03,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 05:54:03,652 INFO L87 Difference]: Start difference. First operand 169 states and 191 transitions. Second operand has 26 states, 26 states have (on average 2.423076923076923) internal successors, (63), 25 states have internal predecessors, (63), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:04,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:54:04,796 INFO L93 Difference]: Finished difference Result 180 states and 204 transitions. [2021-05-06 05:54:04,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 05:54:04,797 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.423076923076923) internal successors, (63), 25 states have internal predecessors, (63), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 65 [2021-05-06 05:54:04,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:54:04,798 INFO L225 Difference]: With dead ends: 180 [2021-05-06 05:54:04,798 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 05:54:04,798 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 52 SyntacticMatches, 16 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 421.5ms TimeCoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 05:54:04,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 05:54:04,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 176. [2021-05-06 05:54:04,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 25 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 05:54:04,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 199 transitions. [2021-05-06 05:54:04,802 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 199 transitions. Word has length 65 [2021-05-06 05:54:04,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:54:04,802 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 199 transitions. [2021-05-06 05:54:04,802 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.423076923076923) internal successors, (63), 25 states have internal predecessors, (63), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:04,802 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 199 transitions. [2021-05-06 05:54:04,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 05:54:04,803 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:54:04,803 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:54:05,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 05:54:05,003 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:54:05,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:54:05,004 INFO L82 PathProgramCache]: Analyzing trace with hash 2022327035, now seen corresponding path program 21 times [2021-05-06 05:54:05,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:54:05,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931496369] [2021-05-06 05:54:05,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:54:05,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:05,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:54:05,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:05,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 05:54:05,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:05,311 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:54:05,311 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:54:05,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931496369] [2021-05-06 05:54:05,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931496369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:05,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470040066] [2021-05-06 05:54:05,311 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:30,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-05-06 05:54:30,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:54:30,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-06 05:54:30,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:54:30,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:54:30,449 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:54:30,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470040066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:30,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:54:30,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-06 05:54:30,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189761041] [2021-05-06 05:54:30,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 05:54:30,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:54:30,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 05:54:30,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-06 05:54:30,450 INFO L87 Difference]: Start difference. First operand 176 states and 199 transitions. Second operand has 27 states, 27 states have (on average 2.4074074074074074) internal successors, (65), 26 states have internal predecessors, (65), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:31,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:54:31,721 INFO L93 Difference]: Finished difference Result 187 states and 212 transitions. [2021-05-06 05:54:31,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 05:54:31,722 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4074074074074074) internal successors, (65), 26 states have internal predecessors, (65), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 67 [2021-05-06 05:54:31,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:54:31,723 INFO L225 Difference]: With dead ends: 187 [2021-05-06 05:54:31,723 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 05:54:31,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 226.5ms TimeCoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-06 05:54:31,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 05:54:31,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2021-05-06 05:54:31,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 26 states have call successors, (26), 4 states have call predecessors, (26), 3 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-06 05:54:31,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 207 transitions. [2021-05-06 05:54:31,726 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 207 transitions. Word has length 67 [2021-05-06 05:54:31,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:54:31,727 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 207 transitions. [2021-05-06 05:54:31,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.4074074074074074) internal successors, (65), 26 states have internal predecessors, (65), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:31,727 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 207 transitions. [2021-05-06 05:54:31,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 05:54:31,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:54:31,727 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:54:31,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:31,937 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:54:31,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:54:31,937 INFO L82 PathProgramCache]: Analyzing trace with hash 569352185, now seen corresponding path program 22 times [2021-05-06 05:54:31,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:54:31,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307804681] [2021-05-06 05:54:31,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:54:31,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:32,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:54:32,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:32,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 05:54:32,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:32,343 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:54:32,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:54:32,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307804681] [2021-05-06 05:54:32,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307804681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:32,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514062329] [2021-05-06 05:54:32,344 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:54:32,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:54:32,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:54:32,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-06 05:54:32,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:54:32,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:54:32,715 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:54:32,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514062329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:32,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:54:32,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-06 05:54:32,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157926120] [2021-05-06 05:54:32,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 05:54:32,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:54:32,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 05:54:32,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 05:54:32,717 INFO L87 Difference]: Start difference. First operand 183 states and 207 transitions. Second operand has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:34,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:54:34,120 INFO L93 Difference]: Finished difference Result 194 states and 220 transitions. [2021-05-06 05:54:34,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 05:54:34,121 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2021-05-06 05:54:34,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:54:34,121 INFO L225 Difference]: With dead ends: 194 [2021-05-06 05:54:34,121 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 05:54:34,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 50 SyntacticMatches, 22 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 510.0ms TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 05:54:34,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 05:54:34,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 190. [2021-05-06 05:54:34,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 159 states have (on average 1.0188679245283019) internal successors, (162), 159 states have internal predecessors, (162), 27 states have call successors, (27), 4 states have call predecessors, (27), 3 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-06 05:54:34,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 215 transitions. [2021-05-06 05:54:34,125 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 215 transitions. Word has length 69 [2021-05-06 05:54:34,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:54:34,125 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 215 transitions. [2021-05-06 05:54:34,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:54:34,125 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 215 transitions. [2021-05-06 05:54:34,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 05:54:34,126 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:54:34,126 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:54:34,326 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 05:54:34,326 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:54:34,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:54:34,326 INFO L82 PathProgramCache]: Analyzing trace with hash 124892535, now seen corresponding path program 23 times [2021-05-06 05:54:34,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:54:34,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411378617] [2021-05-06 05:54:34,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:54:34,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:34,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:54:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:34,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-06 05:54:34,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:54:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:54:34,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:54:34,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411378617] [2021-05-06 05:54:34,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411378617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:54:34,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990785532] [2021-05-06 05:54:34,696 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:56:18,671 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-06 05:56:18,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:56:18,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-06 05:56:18,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:56:18,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:56:18,855 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:56:18,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990785532] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:56:18,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:56:18,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-06 05:56:18,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571636573] [2021-05-06 05:56:18,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 05:56:18,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:56:18,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 05:56:18,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 05:56:18,857 INFO L87 Difference]: Start difference. First operand 190 states and 215 transitions. Second operand has 29 states, 29 states have (on average 2.3793103448275863) internal successors, (69), 28 states have internal predecessors, (69), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:56:20,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:56:20,331 INFO L93 Difference]: Finished difference Result 201 states and 228 transitions. [2021-05-06 05:56:20,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 05:56:20,332 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.3793103448275863) internal successors, (69), 28 states have internal predecessors, (69), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 71 [2021-05-06 05:56:20,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:56:20,332 INFO L225 Difference]: With dead ends: 201 [2021-05-06 05:56:20,333 INFO L226 Difference]: Without dead ends: 201 [2021-05-06 05:56:20,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 308.1ms TimeCoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 05:56:20,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-06 05:56:20,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 197. [2021-05-06 05:56:20,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 165 states have (on average 1.018181818181818) internal successors, (168), 165 states have internal predecessors, (168), 28 states have call successors, (28), 4 states have call predecessors, (28), 3 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 05:56:20,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 223 transitions. [2021-05-06 05:56:20,337 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 223 transitions. Word has length 71 [2021-05-06 05:56:20,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:56:20,338 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 223 transitions. [2021-05-06 05:56:20,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.3793103448275863) internal successors, (69), 28 states have internal predecessors, (69), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:56:20,338 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 223 transitions. [2021-05-06 05:56:20,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 05:56:20,338 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:56:20,338 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:56:20,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:56:20,549 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:56:20,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:56:20,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1799068811, now seen corresponding path program 24 times [2021-05-06 05:56:20,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:56:20,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733496651] [2021-05-06 05:56:20,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:56:20,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:56:20,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:56:20,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:56:20,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 05:56:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:56:20,951 INFO L134 CoverageAnalysis]: Checked inductivity of 629 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:56:20,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:56:20,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733496651] [2021-05-06 05:56:20,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733496651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:56:20,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005108582] [2021-05-06 05:56:20,951 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:59:44,118 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2021-05-06 05:59:44,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:59:44,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-06 05:59:44,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:59:44,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:59:44,325 INFO L134 CoverageAnalysis]: Checked inductivity of 629 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:59:44,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005108582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:44,325 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:59:44,325 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 05:59:44,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177912647] [2021-05-06 05:59:44,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 05:59:44,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:59:44,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 05:59:44,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 05:59:44,326 INFO L87 Difference]: Start difference. First operand 197 states and 223 transitions. Second operand has 30 states, 30 states have (on average 2.3666666666666667) internal successors, (71), 29 states have internal predecessors, (71), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:45,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:59:45,973 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2021-05-06 05:59:45,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 05:59:45,973 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.3666666666666667) internal successors, (71), 29 states have internal predecessors, (71), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 73 [2021-05-06 05:59:45,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:59:45,974 INFO L225 Difference]: With dead ends: 208 [2021-05-06 05:59:45,974 INFO L226 Difference]: Without dead ends: 208 [2021-05-06 05:59:45,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 383.1ms TimeCoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 05:59:45,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-06 05:59:45,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 204. [2021-05-06 05:59:45,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 171 states have (on average 1.0175438596491229) internal successors, (174), 171 states have internal predecessors, (174), 29 states have call successors, (29), 4 states have call predecessors, (29), 3 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-06 05:59:45,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 231 transitions. [2021-05-06 05:59:45,978 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 231 transitions. Word has length 73 [2021-05-06 05:59:45,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:59:45,978 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 231 transitions. [2021-05-06 05:59:45,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.3666666666666667) internal successors, (71), 29 states have internal predecessors, (71), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:45,978 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 231 transitions. [2021-05-06 05:59:45,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 05:59:45,978 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:59:45,978 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:59:46,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-06 05:59:46,179 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:59:46,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:59:46,180 INFO L82 PathProgramCache]: Analyzing trace with hash 404982259, now seen corresponding path program 25 times [2021-05-06 05:59:46,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:59:46,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684016518] [2021-05-06 05:59:46,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:59:46,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:46,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:59:46,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:46,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 05:59:46,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:46,603 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:59:46,603 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:59:46,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684016518] [2021-05-06 05:59:46,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684016518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:46,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056385361] [2021-05-06 05:59:46,603 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:59:46,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:46,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-06 05:59:46,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:59:46,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:59:46,972 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:59:46,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056385361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:46,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:59:46,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-06 05:59:46,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892839823] [2021-05-06 05:59:46,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 05:59:46,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:59:46,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 05:59:46,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 05:59:46,974 INFO L87 Difference]: Start difference. First operand 204 states and 231 transitions. Second operand has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:48,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:59:48,694 INFO L93 Difference]: Finished difference Result 215 states and 244 transitions. [2021-05-06 05:59:48,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 05:59:48,695 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 75 [2021-05-06 05:59:48,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:59:48,696 INFO L225 Difference]: With dead ends: 215 [2021-05-06 05:59:48,696 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 05:59:48,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 60 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 591.1ms TimeCoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 05:59:48,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 05:59:48,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 211. [2021-05-06 05:59:48,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 177 states have (on average 1.0169491525423728) internal successors, (180), 177 states have internal predecessors, (180), 30 states have call successors, (30), 4 states have call predecessors, (30), 3 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 05:59:48,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 239 transitions. [2021-05-06 05:59:48,729 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 239 transitions. Word has length 75 [2021-05-06 05:59:48,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:59:48,729 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 239 transitions. [2021-05-06 05:59:48,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:48,729 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 239 transitions. [2021-05-06 05:59:48,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 05:59:48,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:59:48,730 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:59:48,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 05:59:48,930 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:59:48,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:59:48,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1079183601, now seen corresponding path program 26 times [2021-05-06 05:59:48,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:59:48,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296615679] [2021-05-06 05:59:48,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:59:48,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:49,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:59:49,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:49,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 05:59:49,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:49,427 INFO L134 CoverageAnalysis]: Checked inductivity of 733 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:59:49,427 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:59:49,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296615679] [2021-05-06 05:59:49,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296615679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:49,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708984731] [2021-05-06 05:59:49,427 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:59:49,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:59:49,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:59:49,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-06 05:59:49,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:59:49,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:59:49,781 INFO L134 CoverageAnalysis]: Checked inductivity of 733 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:59:49,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708984731] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:49,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:59:49,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 05:59:49,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314477044] [2021-05-06 05:59:49,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 05:59:49,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:59:49,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 05:59:49,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 05:59:49,782 INFO L87 Difference]: Start difference. First operand 211 states and 239 transitions. Second operand has 32 states, 32 states have (on average 2.34375) internal successors, (75), 31 states have internal predecessors, (75), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:51,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:59:51,139 INFO L93 Difference]: Finished difference Result 222 states and 252 transitions. [2021-05-06 05:59:51,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 05:59:51,139 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 31 states have internal predecessors, (75), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 77 [2021-05-06 05:59:51,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:59:51,140 INFO L225 Difference]: With dead ends: 222 [2021-05-06 05:59:51,140 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 05:59:51,140 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 621.3ms TimeCoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 05:59:51,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 05:59:51,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 218. [2021-05-06 05:59:51,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 183 states have (on average 1.0163934426229508) internal successors, (186), 183 states have internal predecessors, (186), 31 states have call successors, (31), 4 states have call predecessors, (31), 3 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-06 05:59:51,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 247 transitions. [2021-05-06 05:59:51,144 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 247 transitions. Word has length 77 [2021-05-06 05:59:51,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:59:51,144 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 247 transitions. [2021-05-06 05:59:51,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 31 states have internal predecessors, (75), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:59:51,144 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 247 transitions. [2021-05-06 05:59:51,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 05:59:51,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:59:51,145 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:59:51,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 05:59:51,345 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:59:51,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:59:51,345 INFO L82 PathProgramCache]: Analyzing trace with hash 446611567, now seen corresponding path program 27 times [2021-05-06 05:59:51,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:59:51,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58348028] [2021-05-06 05:59:51,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:59:51,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:51,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:59:51,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:51,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-06 05:59:51,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:59:51,819 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:59:51,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:59:51,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58348028] [2021-05-06 05:59:51,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58348028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:59:51,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483298874] [2021-05-06 05:59:51,819 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:02:10,130 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-05-06 06:02:10,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:02:10,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-06 06:02:10,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:02:10,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:02:10,328 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:02:10,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483298874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:02:10,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:02:10,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-06 06:02:10,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876567513] [2021-05-06 06:02:10,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 06:02:10,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:02:10,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 06:02:10,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 06:02:10,330 INFO L87 Difference]: Start difference. First operand 218 states and 247 transitions. Second operand has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 32 states have internal predecessors, (77), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:02:12,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:02:12,261 INFO L93 Difference]: Finished difference Result 229 states and 260 transitions. [2021-05-06 06:02:12,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 06:02:12,262 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 32 states have internal predecessors, (77), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 79 [2021-05-06 06:02:12,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:02:12,263 INFO L225 Difference]: With dead ends: 229 [2021-05-06 06:02:12,263 INFO L226 Difference]: Without dead ends: 229 [2021-05-06 06:02:12,263 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 444.9ms TimeCoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 06:02:12,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-06 06:02:12,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 225. [2021-05-06 06:02:12,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 32 states have call successors, (32), 4 states have call predecessors, (32), 3 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 06:02:12,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 255 transitions. [2021-05-06 06:02:12,266 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 255 transitions. Word has length 79 [2021-05-06 06:02:12,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:02:12,267 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 255 transitions. [2021-05-06 06:02:12,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 32 states have internal predecessors, (77), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:02:12,267 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 255 transitions. [2021-05-06 06:02:12,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 06:02:12,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:02:12,267 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:02:12,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:02:12,477 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:02:12,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:02:12,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1864724371, now seen corresponding path program 28 times [2021-05-06 06:02:12,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:02:12,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010691800] [2021-05-06 06:02:12,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:02:12,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:12,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:02:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:12,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2021-05-06 06:02:12,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:12,989 INFO L134 CoverageAnalysis]: Checked inductivity of 845 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:02:12,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:02:12,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010691800] [2021-05-06 06:02:12,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010691800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:02:12,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529556964] [2021-05-06 06:02:12,989 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:02:13,040 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:02:13,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:02:13,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-06 06:02:13,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:02:13,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:02:13,513 INFO L134 CoverageAnalysis]: Checked inductivity of 845 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:02:13,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529556964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:02:13,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:02:13,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-06 06:02:13,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907982446] [2021-05-06 06:02:13,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 06:02:13,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:02:13,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 06:02:13,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:02:13,514 INFO L87 Difference]: Start difference. First operand 225 states and 255 transitions. Second operand has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:02:15,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:02:15,357 INFO L93 Difference]: Finished difference Result 236 states and 268 transitions. [2021-05-06 06:02:15,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 06:02:15,357 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 81 [2021-05-06 06:02:15,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:02:15,358 INFO L225 Difference]: With dead ends: 236 [2021-05-06 06:02:15,358 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 06:02:15,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 28 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 816.9ms TimeCoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:02:15,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 06:02:15,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 232. [2021-05-06 06:02:15,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 195 states have (on average 1.0153846153846153) internal successors, (198), 195 states have internal predecessors, (198), 33 states have call successors, (33), 4 states have call predecessors, (33), 3 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 06:02:15,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 263 transitions. [2021-05-06 06:02:15,363 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 263 transitions. Word has length 81 [2021-05-06 06:02:15,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:02:15,363 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 263 transitions. [2021-05-06 06:02:15,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.323529411764706) internal successors, (79), 33 states have internal predecessors, (79), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:02:15,363 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 263 transitions. [2021-05-06 06:02:15,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 06:02:15,363 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:02:15,363 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:02:15,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-06 06:02:15,581 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:02:15,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:02:15,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1734498539, now seen corresponding path program 29 times [2021-05-06 06:02:15,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:02:15,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399262286] [2021-05-06 06:02:15,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:02:15,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:16,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:02:16,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:16,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-06 06:02:16,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:02:16,035 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:02:16,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:02:16,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399262286] [2021-05-06 06:02:16,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399262286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:02:16,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438060032] [2021-05-06 06:02:16,036 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true