/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-05 23:53:40,267 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-05 23:53:40,269 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-05 23:53:40,291 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-05 23:53:40,314 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-05 23:53:40,314 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-05 23:53:40,315 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-05 23:53:40,319 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-05 23:53:40,339 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-05 23:53:40,339 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-05 23:53:40,340 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-05 23:53:40,340 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-05 23:53:40,340 INFO L138 SettingsManager]: * Use SBE=true [2021-05-05 23:53:40,340 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-05 23:53:40,341 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-05 23:53:40,342 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-05 23:53:40,342 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-05 23:53:40,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-05 23:53:40,343 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-05 23:53:40,578 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-05 23:53:40,596 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-05 23:53:40,598 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-05 23:53:40,598 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-05 23:53:40,600 INFO L275 PluginConnector]: CDTParser initialized [2021-05-05 23:53:40,600 INFO L432 ainManager$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 [2021-05-05 23:53:40,643 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c1479db79/27c7ed3211504cb98114f0f68aeaf272/FLAGdda3fcd45 [2021-05-05 23:53:41,014 INFO L306 CDTParser]: Found 1 translation units. [2021-05-05 23:53:41,014 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i [2021-05-05 23:53:41,018 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c1479db79/27c7ed3211504cb98114f0f68aeaf272/FLAGdda3fcd45 [2021-05-05 23:53:41,027 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c1479db79/27c7ed3211504cb98114f0f68aeaf272 [2021-05-05 23:53:41,029 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-05 23:53:41,031 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-05 23:53:41,033 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-05 23:53:41,033 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-05 23:53:41,036 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-05 23:53:41,037 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,038 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78982ff9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41, skipping insertion in model container [2021-05-05 23:53:41,039 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,043 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-05 23:53:41,057 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-05 23:53:41,137 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] [2021-05-05 23:53:41,146 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-05 23:53:41,150 INFO L203 MainTranslator]: Completed pre-run [2021-05-05 23:53:41,184 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] [2021-05-05 23:53:41,188 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-05 23:53:41,199 INFO L208 MainTranslator]: Completed translation [2021-05-05 23:53:41,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41 WrapperNode [2021-05-05 23:53:41,200 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-05 23:53:41,201 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-05 23:53:41,201 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-05 23:53:41,201 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-05 23:53:41,208 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,216 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,219 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (1/1) ... [2021-05-05 23:53:41,220 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-05 23:53:41,221 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-05 23:53:41,221 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-05 23:53:41,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-05 23:53:41,221 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (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 [2021-05-05 23:53:41,279 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-05 23:53:41,279 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-05 23:53:41,279 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-05 23:53:41,279 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-05 23:53:41,279 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-05 23:53:41,280 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-05 23:53:41,280 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-05 23:53:41,280 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-05 23:53:41,280 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-05 23:53:41,280 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-05 23:53:41,281 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-05 23:53:41,281 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-05 23:53:41,281 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-05 23:53:41,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-05 23:53:41,282 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-05 23:53:41,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-05 23:53:41,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-05 23:53:41,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-05 23:53:41,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-05 23:53:41,528 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-05 23:53:41,529 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-05 23:53:41,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.05 11:53:41 BoogieIcfgContainer [2021-05-05 23:53:41,530 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-05 23:53:41,530 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-05 23:53:41,531 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-05 23:53:41,532 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-05 23:53:41,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.05 11:53:41" (1/3) ... [2021-05-05 23:53:41,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26b9ef07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.05 11:53:41, skipping insertion in model container [2021-05-05 23:53:41,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.05 11:53:41" (2/3) ... [2021-05-05 23:53:41,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26b9ef07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.05 11:53:41, skipping insertion in model container [2021-05-05 23:53:41,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.05 11:53:41" (3/3) ... [2021-05-05 23:53:41,534 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_1-1.i [2021-05-05 23:53:41,538 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-05 23:53:41,540 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-05 23:53:41,550 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-05 23:53:41,567 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-05 23:53:41,568 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-05 23:53:41,568 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-05 23:53:41,568 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-05 23:53:41,568 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-05 23:53:41,568 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-05 23:53:41,568 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-05 23:53:41,568 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-05 23:53:41,578 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) [2021-05-05 23:53:41,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-05 23:53:41,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:41,582 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-05 23:53:41,582 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:41,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:41,585 INFO L82 PathProgramCache]: Analyzing trace with hash 56847072, now seen corresponding path program 1 times [2021-05-05 23:53:41,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:41,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888449423] [2021-05-05 23:53:41,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:41,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:41,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:41,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-05 23:53:41,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:41,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888449423] [2021-05-05 23:53:41,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888449423] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-05 23:53:41,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-05 23:53:41,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-05 23:53:41,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599625075] [2021-05-05 23:53:41,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-05 23:53:41,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:41,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-05 23:53:41,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-05 23:53:41,772 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) [2021-05-05 23:53:41,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:41,855 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2021-05-05 23:53:41,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-05 23:53:41,857 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 [2021-05-05 23:53:41,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:41,862 INFO L225 Difference]: With dead ends: 46 [2021-05-05 23:53:41,862 INFO L226 Difference]: Without dead ends: 22 [2021-05-05 23:53:41,864 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-05 23:53:41,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-05 23:53:41,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-05 23:53:41,888 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) [2021-05-05 23:53:41,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-05-05 23:53:41,890 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2021-05-05 23:53:41,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:41,891 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-05-05 23:53:41,891 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) [2021-05-05 23:53:41,891 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-05-05 23:53:41,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-05 23:53:41,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:41,892 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-05 23:53:41,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-05 23:53:41,892 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:41,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:41,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1810080346, now seen corresponding path program 1 times [2021-05-05 23:53:41,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:41,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301627049] [2021-05-05 23:53:41,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:41,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:41,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:41,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:41,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-05 23:53:41,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:41,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301627049] [2021-05-05 23:53:41,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301627049] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-05 23:53:41,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-05 23:53:41,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-05 23:53:41,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243325329] [2021-05-05 23:53:41,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-05 23:53:41,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:41,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-05 23:53:41,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-05 23:53:41,975 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) [2021-05-05 23:53:42,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:42,031 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-05-05 23:53:42,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-05 23:53:42,032 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 [2021-05-05 23:53:42,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:42,032 INFO L225 Difference]: With dead ends: 43 [2021-05-05 23:53:42,032 INFO L226 Difference]: Without dead ends: 29 [2021-05-05 23:53:42,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-05 23:53:42,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-05 23:53:42,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-05-05 23:53:42,044 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) [2021-05-05 23:53:42,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-05 23:53:42,044 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 14 [2021-05-05 23:53:42,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:42,045 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-05 23:53:42,045 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) [2021-05-05 23:53:42,045 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-05 23:53:42,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-05 23:53:42,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:42,045 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-05 23:53:42,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-05 23:53:42,045 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:42,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:42,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1733475192, now seen corresponding path program 1 times [2021-05-05 23:53:42,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:42,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019585464] [2021-05-05 23:53:42,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:42,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:42,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-05 23:53:42,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:42,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019585464] [2021-05-05 23:53:42,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019585464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:42,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259173120] [2021-05-05 23:53:42,109 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 [2021-05-05 23:53:42,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-05 23:53:42,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:42,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,230 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 [2021-05-05 23:53:42,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-05 23:53:42,233 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-05 23:53:42,234 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-05 23:53:42,234 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2021-05-05 23:53:42,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,276 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 [2021-05-05 23:53:42,278 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-05 23:53:42,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-05 23:53:42,279 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-05 23:53:42,280 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2021-05-05 23:53:42,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-05 23:53:42,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259173120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:42,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:42,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8] total 10 [2021-05-05 23:53:42,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789610644] [2021-05-05 23:53:42,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-05 23:53:42,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:42,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-05 23:53:42,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-05 23:53:42,321 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) [2021-05-05 23:53:42,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:42,490 INFO L93 Difference]: Finished difference Result 56 states and 65 transitions. [2021-05-05 23:53:42,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-05 23:53:42,491 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 [2021-05-05 23:53:42,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:42,492 INFO L225 Difference]: With dead ends: 56 [2021-05-05 23:53:42,492 INFO L226 Difference]: Without dead ends: 40 [2021-05-05 23:53:42,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 103.1ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-05 23:53:42,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-05 23:53:42,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2021-05-05 23:53:42,503 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) [2021-05-05 23:53:42,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-05 23:53:42,505 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 16 [2021-05-05 23:53:42,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:42,505 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-05 23:53:42,505 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) [2021-05-05 23:53:42,505 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-05 23:53:42,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-05 23:53:42,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:42,506 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] [2021-05-05 23:53:42,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-05 23:53:42,726 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:42,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:42,726 INFO L82 PathProgramCache]: Analyzing trace with hash 2014289623, now seen corresponding path program 1 times [2021-05-05 23:53:42,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:42,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076713561] [2021-05-05 23:53:42,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:42,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:42,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-05 23:53:42,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,838 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:42,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:42,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076713561] [2021-05-05 23:53:42,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076713561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:42,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002278715] [2021-05-05 23:53:42,839 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 [2021-05-05 23:53:42,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:42,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-05 23:53:42,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:42,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:42,969 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:42,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002278715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:42,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:42,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-05 23:53:42,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425916740] [2021-05-05 23:53:42,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-05 23:53:42,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:42,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-05 23:53:42,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-05 23:53:42,977 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) [2021-05-05 23:53:43,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:43,124 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2021-05-05 23:53:43,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-05 23:53:43,125 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 [2021-05-05 23:53:43,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:43,126 INFO L225 Difference]: With dead ends: 72 [2021-05-05 23:53:43,126 INFO L226 Difference]: Without dead ends: 47 [2021-05-05 23:53:43,127 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 39.0ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-05 23:53:43,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-05 23:53:43,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-05-05 23:53:43,138 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) [2021-05-05 23:53:43,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-05 23:53:43,143 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 27 [2021-05-05 23:53:43,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:43,144 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-05 23:53:43,144 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) [2021-05-05 23:53:43,144 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-05 23:53:43,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-05 23:53:43,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:43,145 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] [2021-05-05 23:53:43,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:43,358 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:43,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:43,358 INFO L82 PathProgramCache]: Analyzing trace with hash 108033845, now seen corresponding path program 2 times [2021-05-05 23:53:43,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:43,359 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741381679] [2021-05-05 23:53:43,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:43,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:43,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:43,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:43,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-05 23:53:43,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:43,438 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:43,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:43,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741381679] [2021-05-05 23:53:43,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741381679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:43,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904094870] [2021-05-05 23:53:43,439 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 [2021-05-05 23:53:43,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-05 23:53:43,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:43,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-05 23:53:43,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:43,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:43,613 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:43,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904094870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:43,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:43,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-05 23:53:43,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110013998] [2021-05-05 23:53:43,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-05 23:53:43,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:43,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-05 23:53:43,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-05 23:53:43,614 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) [2021-05-05 23:53:43,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:43,762 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2021-05-05 23:53:43,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-05 23:53:43,763 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 [2021-05-05 23:53:43,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:43,764 INFO L225 Difference]: With dead ends: 84 [2021-05-05 23:53:43,764 INFO L226 Difference]: Without dead ends: 54 [2021-05-05 23:53:43,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 51.7ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-05 23:53:43,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-05 23:53:43,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2021-05-05 23:53:43,774 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) [2021-05-05 23:53:43,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-05-05 23:53:43,777 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 29 [2021-05-05 23:53:43,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:43,777 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-05-05 23:53:43,778 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) [2021-05-05 23:53:43,778 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-05-05 23:53:43,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-05 23:53:43,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:43,779 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] [2021-05-05 23:53:43,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:43,983 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:43,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:43,983 INFO L82 PathProgramCache]: Analyzing trace with hash 2147266579, now seen corresponding path program 3 times [2021-05-05 23:53:43,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:43,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518384654] [2021-05-05 23:53:43,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:44,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:44,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-05 23:53:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,102 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:44,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:44,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518384654] [2021-05-05 23:53:44,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518384654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:44,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348276137] [2021-05-05 23:53:44,103 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 [2021-05-05 23:53:44,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-05 23:53:44,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:44,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-05 23:53:44,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:44,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:44,259 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:44,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348276137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:44,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:44,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-05 23:53:44,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996429895] [2021-05-05 23:53:44,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-05 23:53:44,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:44,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-05 23:53:44,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-05 23:53:44,261 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) [2021-05-05 23:53:44,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:44,416 INFO L93 Difference]: Finished difference Result 96 states and 109 transitions. [2021-05-05 23:53:44,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-05 23:53:44,416 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 [2021-05-05 23:53:44,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:44,417 INFO L225 Difference]: With dead ends: 96 [2021-05-05 23:53:44,417 INFO L226 Difference]: Without dead ends: 61 [2021-05-05 23:53:44,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 63.0ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-05 23:53:44,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-05 23:53:44,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2021-05-05 23:53:44,421 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) [2021-05-05 23:53:44,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-05-05 23:53:44,422 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 31 [2021-05-05 23:53:44,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:44,422 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-05-05 23:53:44,422 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) [2021-05-05 23:53:44,422 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-05-05 23:53:44,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-05 23:53:44,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:44,423 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] [2021-05-05 23:53:44,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:44,628 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:44,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:44,628 INFO L82 PathProgramCache]: Analyzing trace with hash -950130319, now seen corresponding path program 4 times [2021-05-05 23:53:44,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:44,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077647981] [2021-05-05 23:53:44,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:44,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:44,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-05 23:53:44,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:44,715 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:44,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:44,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077647981] [2021-05-05 23:53:44,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2077647981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:44,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596096071] [2021-05-05 23:53:44,716 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 [2021-05-05 23:53:44,780 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-05 23:53:44,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:44,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-05 23:53:44,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:44,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:44,848 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:44,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596096071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:44,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:44,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-05 23:53:44,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771357366] [2021-05-05 23:53:44,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-05 23:53:44,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:44,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-05 23:53:44,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-05 23:53:44,849 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) [2021-05-05 23:53:45,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:45,064 INFO L93 Difference]: Finished difference Result 108 states and 123 transitions. [2021-05-05 23:53:45,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-05 23:53:45,064 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 [2021-05-05 23:53:45,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:45,066 INFO L225 Difference]: With dead ends: 108 [2021-05-05 23:53:45,066 INFO L226 Difference]: Without dead ends: 68 [2021-05-05 23:53:45,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 63.5ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-05 23:53:45,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-05 23:53:45,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2021-05-05 23:53:45,073 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) [2021-05-05 23:53:45,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-05 23:53:45,074 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 33 [2021-05-05 23:53:45,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:45,075 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-05 23:53:45,075 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) [2021-05-05 23:53:45,075 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-05 23:53:45,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-05 23:53:45,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:45,075 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] [2021-05-05 23:53:45,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-05 23:53:45,287 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:45,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:45,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1136213169, now seen corresponding path program 5 times [2021-05-05 23:53:45,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:45,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52732424] [2021-05-05 23:53:45,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:45,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:45,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:45,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:45,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-05 23:53:45,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:45,387 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:45,387 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:45,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52732424] [2021-05-05 23:53:45,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52732424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:45,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737714468] [2021-05-05 23:53:45,388 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 [2021-05-05 23:53:45,643 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-05 23:53:45,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:45,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-05 23:53:45,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:45,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:45,717 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:45,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737714468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:45,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:45,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-05 23:53:45,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611192629] [2021-05-05 23:53:45,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-05 23:53:45,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:45,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-05 23:53:45,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-05 23:53:45,719 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) [2021-05-05 23:53:45,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:45,960 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2021-05-05 23:53:45,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-05 23:53:45,960 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 [2021-05-05 23:53:45,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:45,961 INFO L225 Difference]: With dead ends: 120 [2021-05-05 23:53:45,961 INFO L226 Difference]: Without dead ends: 75 [2021-05-05 23:53:45,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 71.5ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-05 23:53:45,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-05 23:53:45,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 71. [2021-05-05 23:53:45,966 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) [2021-05-05 23:53:45,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 79 transitions. [2021-05-05 23:53:45,966 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 79 transitions. Word has length 35 [2021-05-05 23:53:45,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:45,967 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 79 transitions. [2021-05-05 23:53:45,967 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) [2021-05-05 23:53:45,967 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 79 transitions. [2021-05-05 23:53:45,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-05 23:53:45,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:45,967 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] [2021-05-05 23:53:46,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:46,172 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:46,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:46,172 INFO L82 PathProgramCache]: Analyzing trace with hash 426794413, now seen corresponding path program 6 times [2021-05-05 23:53:46,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:46,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209449264] [2021-05-05 23:53:46,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:46,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:46,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:46,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:46,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-05 23:53:46,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:46,318 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:46,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:46,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209449264] [2021-05-05 23:53:46,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209449264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:46,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127790279] [2021-05-05 23:53:46,319 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 [2021-05-05 23:53:46,539 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-05 23:53:46,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:46,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-05 23:53:46,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:46,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:46,617 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:46,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127790279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:46,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:46,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-05 23:53:46,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461425156] [2021-05-05 23:53:46,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-05 23:53:46,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:46,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-05 23:53:46,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-05 23:53:46,618 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) [2021-05-05 23:53:46,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:46,875 INFO L93 Difference]: Finished difference Result 132 states and 151 transitions. [2021-05-05 23:53:46,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-05 23:53:46,875 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 [2021-05-05 23:53:46,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:46,876 INFO L225 Difference]: With dead ends: 132 [2021-05-05 23:53:46,876 INFO L226 Difference]: Without dead ends: 82 [2021-05-05 23:53:46,876 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 109.2ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-05 23:53:46,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-05 23:53:46,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2021-05-05 23:53:46,881 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) [2021-05-05 23:53:46,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 87 transitions. [2021-05-05 23:53:46,881 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 87 transitions. Word has length 37 [2021-05-05 23:53:46,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:46,882 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 87 transitions. [2021-05-05 23:53:46,882 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) [2021-05-05 23:53:46,882 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 87 transitions. [2021-05-05 23:53:46,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-05 23:53:46,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:46,882 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] [2021-05-05 23:53:47,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:47,089 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:47,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:47,089 INFO L82 PathProgramCache]: Analyzing trace with hash -761472885, now seen corresponding path program 7 times [2021-05-05 23:53:47,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:47,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013222814] [2021-05-05 23:53:47,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:47,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:47,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:47,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:47,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-05 23:53:47,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:47,209 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:47,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:47,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013222814] [2021-05-05 23:53:47,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013222814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:47,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216845058] [2021-05-05 23:53:47,209 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 [2021-05-05 23:53:47,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:47,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-05 23:53:47,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:47,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:47,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216845058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:47,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:47,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-05 23:53:47,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624221760] [2021-05-05 23:53:47,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-05 23:53:47,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:47,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-05 23:53:47,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-05 23:53:47,411 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) [2021-05-05 23:53:47,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:47,770 INFO L93 Difference]: Finished difference Result 144 states and 165 transitions. [2021-05-05 23:53:47,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-05 23:53:47,771 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 [2021-05-05 23:53:47,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:47,771 INFO L225 Difference]: With dead ends: 144 [2021-05-05 23:53:47,771 INFO L226 Difference]: Without dead ends: 89 [2021-05-05 23:53:47,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 141.4ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-05 23:53:47,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-05 23:53:47,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2021-05-05 23:53:47,784 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) [2021-05-05 23:53:47,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2021-05-05 23:53:47,785 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 39 [2021-05-05 23:53:47,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:47,785 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2021-05-05 23:53:47,785 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) [2021-05-05 23:53:47,785 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2021-05-05 23:53:47,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-05 23:53:47,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:47,786 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] [2021-05-05 23:53:47,993 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-05 23:53:47,993 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:47,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:47,993 INFO L82 PathProgramCache]: Analyzing trace with hash -225045527, now seen corresponding path program 8 times [2021-05-05 23:53:47,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:47,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666659779] [2021-05-05 23:53:47,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:48,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:48,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:48,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:48,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-05 23:53:48,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:48,132 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:48,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:48,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666659779] [2021-05-05 23:53:48,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666659779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:48,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084049207] [2021-05-05 23:53:48,133 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 [2021-05-05 23:53:48,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-05 23:53:48,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:48,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-05 23:53:48,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:48,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:48,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084049207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:48,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:48,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-05 23:53:48,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095464670] [2021-05-05 23:53:48,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-05 23:53:48,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:48,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-05 23:53:48,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-05 23:53:48,296 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) [2021-05-05 23:53:48,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:48,718 INFO L93 Difference]: Finished difference Result 156 states and 179 transitions. [2021-05-05 23:53:48,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-05 23:53:48,719 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 [2021-05-05 23:53:48,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:48,720 INFO L225 Difference]: With dead ends: 156 [2021-05-05 23:53:48,720 INFO L226 Difference]: Without dead ends: 96 [2021-05-05 23:53:48,720 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 8 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 133.4ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-05 23:53:48,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-05 23:53:48,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2021-05-05 23:53:48,724 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) [2021-05-05 23:53:48,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 103 transitions. [2021-05-05 23:53:48,725 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 103 transitions. Word has length 41 [2021-05-05 23:53:48,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:48,725 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 103 transitions. [2021-05-05 23:53:48,725 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) [2021-05-05 23:53:48,725 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 103 transitions. [2021-05-05 23:53:48,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-05 23:53:48,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:48,726 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] [2021-05-05 23:53:48,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:48,933 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:48,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:48,934 INFO L82 PathProgramCache]: Analyzing trace with hash -114430009, now seen corresponding path program 9 times [2021-05-05 23:53:48,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:48,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783161264] [2021-05-05 23:53:48,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:48,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:49,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:49,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:49,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-05 23:53:49,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:49,079 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:49,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:49,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783161264] [2021-05-05 23:53:49,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783161264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:49,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115818489] [2021-05-05 23:53:49,080 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 [2021-05-05 23:53:49,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-05 23:53:49,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:49,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-05 23:53:49,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:49,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:49,879 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:49,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115818489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:49,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:49,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-05 23:53:49,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941560555] [2021-05-05 23:53:49,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-05 23:53:49,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:49,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-05 23:53:49,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-05 23:53:49,881 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) [2021-05-05 23:53:50,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:50,344 INFO L93 Difference]: Finished difference Result 168 states and 193 transitions. [2021-05-05 23:53:50,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-05 23:53:50,345 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 [2021-05-05 23:53:50,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:50,346 INFO L225 Difference]: With dead ends: 168 [2021-05-05 23:53:50,346 INFO L226 Difference]: Without dead ends: 103 [2021-05-05 23:53:50,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 112.0ms TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-05 23:53:50,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-05 23:53:50,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2021-05-05 23:53:50,352 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) [2021-05-05 23:53:50,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 111 transitions. [2021-05-05 23:53:50,355 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 111 transitions. Word has length 43 [2021-05-05 23:53:50,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:50,355 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 111 transitions. [2021-05-05 23:53:50,355 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) [2021-05-05 23:53:50,355 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 111 transitions. [2021-05-05 23:53:50,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-05 23:53:50,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:50,356 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] [2021-05-05 23:53:50,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:53:50,560 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:50,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:50,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1187099611, now seen corresponding path program 10 times [2021-05-05 23:53:50,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:50,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568782805] [2021-05-05 23:53:50,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:50,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:50,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:50,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:50,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-05 23:53:50,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:50,717 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:50,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:50,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568782805] [2021-05-05 23:53:50,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568782805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:50,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054609888] [2021-05-05 23:53:50,717 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 [2021-05-05 23:53:50,768 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-05 23:53:50,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:50,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-05 23:53:50,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:50,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:50,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054609888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:50,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:50,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-05 23:53:50,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908451201] [2021-05-05 23:53:50,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-05 23:53:50,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:50,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-05 23:53:50,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-05 23:53:50,867 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) [2021-05-05 23:53:51,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:51,317 INFO L93 Difference]: Finished difference Result 180 states and 207 transitions. [2021-05-05 23:53:51,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-05 23:53:51,317 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 [2021-05-05 23:53:51,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:51,318 INFO L225 Difference]: With dead ends: 180 [2021-05-05 23:53:51,318 INFO L226 Difference]: Without dead ends: 110 [2021-05-05 23:53:51,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 154.4ms TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-05 23:53:51,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-05 23:53:51,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2021-05-05 23:53:51,323 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) [2021-05-05 23:53:51,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 119 transitions. [2021-05-05 23:53:51,324 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 119 transitions. Word has length 45 [2021-05-05 23:53:51,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:51,324 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 119 transitions. [2021-05-05 23:53:51,324 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) [2021-05-05 23:53:51,324 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 119 transitions. [2021-05-05 23:53:51,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-05 23:53:51,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:51,325 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] [2021-05-05 23:53:51,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-05 23:53:51,537 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:51,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:51,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1230436093, now seen corresponding path program 11 times [2021-05-05 23:53:51,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:51,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13752662] [2021-05-05 23:53:51,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:51,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:51,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:51,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:51,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-05 23:53:51,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:51,732 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:51,733 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:51,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13752662] [2021-05-05 23:53:51,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13752662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:51,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681810081] [2021-05-05 23:53:51,733 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 [2021-05-05 23:53:55,873 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-05 23:53:55,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:53:55,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-05 23:53:55,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:53:56,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:53:56,034 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:53:56,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681810081] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:56,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:53:56,035 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-05 23:53:56,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177410543] [2021-05-05 23:53:56,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-05 23:53:56,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:53:56,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-05 23:53:56,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-05 23:53:56,036 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) [2021-05-05 23:53:56,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:53:56,862 INFO L93 Difference]: Finished difference Result 192 states and 221 transitions. [2021-05-05 23:53:56,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-05 23:53:56,863 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 [2021-05-05 23:53:56,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:53:56,865 INFO L225 Difference]: With dead ends: 192 [2021-05-05 23:53:56,865 INFO L226 Difference]: Without dead ends: 117 [2021-05-05 23:53:56,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 144.3ms TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-05 23:53:56,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-05 23:53:56,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2021-05-05 23:53:56,872 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) [2021-05-05 23:53:56,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 127 transitions. [2021-05-05 23:53:56,873 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 127 transitions. Word has length 47 [2021-05-05 23:53:56,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:53:56,873 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 127 transitions. [2021-05-05 23:53:56,873 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) [2021-05-05 23:53:56,873 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 127 transitions. [2021-05-05 23:53:56,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-05 23:53:56,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:53:56,876 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] [2021-05-05 23:53:57,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-05 23:53:57,083 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:53:57,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:53:57,083 INFO L82 PathProgramCache]: Analyzing trace with hash 72877665, now seen corresponding path program 12 times [2021-05-05 23:53:57,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:53:57,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666729872] [2021-05-05 23:53:57,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:53:57,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:57,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:53:57,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:57,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-05 23:53:57,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:53:57,349 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:53:57,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:53:57,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666729872] [2021-05-05 23:53:57,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666729872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:53:57,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104784896] [2021-05-05 23:53:57,349 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 [2021-05-05 23:54:00,507 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-05-05 23:54:00,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:54:00,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-05 23:54:00,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:00,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:00,634 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:00,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104784896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:00,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:00,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-05 23:54:00,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226845784] [2021-05-05 23:54:00,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-05 23:54:00,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:00,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-05 23:54:00,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-05 23:54:00,635 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) [2021-05-05 23:54:01,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:01,305 INFO L93 Difference]: Finished difference Result 204 states and 235 transitions. [2021-05-05 23:54:01,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-05 23:54:01,305 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 [2021-05-05 23:54:01,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:01,306 INFO L225 Difference]: With dead ends: 204 [2021-05-05 23:54:01,306 INFO L226 Difference]: Without dead ends: 124 [2021-05-05 23:54:01,307 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 219.4ms TimeCoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-05 23:54:01,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-05 23:54:01,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2021-05-05 23:54:01,311 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) [2021-05-05 23:54:01,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 135 transitions. [2021-05-05 23:54:01,313 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 135 transitions. Word has length 49 [2021-05-05 23:54:01,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:01,313 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 135 transitions. [2021-05-05 23:54:01,313 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) [2021-05-05 23:54:01,313 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 135 transitions. [2021-05-05 23:54:01,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-05 23:54:01,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:01,315 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] [2021-05-05 23:54:01,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-05 23:54:01,520 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:01,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:01,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1573051329, now seen corresponding path program 13 times [2021-05-05 23:54:01,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:01,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455402928] [2021-05-05 23:54:01,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:01,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:01,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:01,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:01,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-05 23:54:01,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:01,719 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:01,719 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:01,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455402928] [2021-05-05 23:54:01,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455402928] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:01,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350600137] [2021-05-05 23:54:01,719 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 [2021-05-05 23:54:01,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:01,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-05 23:54:01,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:01,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:01,938 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:01,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350600137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:01,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:01,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-05 23:54:01,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513860279] [2021-05-05 23:54:01,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-05 23:54:01,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:01,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-05 23:54:01,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-05 23:54:01,939 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) [2021-05-05 23:54:02,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:02,614 INFO L93 Difference]: Finished difference Result 216 states and 249 transitions. [2021-05-05 23:54:02,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-05 23:54:02,614 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 [2021-05-05 23:54:02,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:02,615 INFO L225 Difference]: With dead ends: 216 [2021-05-05 23:54:02,615 INFO L226 Difference]: Without dead ends: 131 [2021-05-05 23:54:02,616 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 8 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 208.8ms TimeCoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-05 23:54:02,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-05 23:54:02,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 127. [2021-05-05 23:54:02,620 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) [2021-05-05 23:54:02,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-05 23:54:02,620 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 51 [2021-05-05 23:54:02,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:02,621 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-05 23:54:02,621 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) [2021-05-05 23:54:02,621 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-05 23:54:02,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-05 23:54:02,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:02,621 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] [2021-05-05 23:54:02,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:54:02,829 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:02,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:02,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1532117661, now seen corresponding path program 14 times [2021-05-05 23:54:02,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:02,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298200476] [2021-05-05 23:54:02,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:02,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:03,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:03,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:03,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-05 23:54:03,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:03,043 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:03,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:03,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298200476] [2021-05-05 23:54:03,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298200476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:03,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032312756] [2021-05-05 23:54:03,043 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 [2021-05-05 23:54:03,130 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-05 23:54:03,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:54:03,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-05 23:54:03,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:03,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:03,290 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:03,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032312756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:03,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:03,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-05 23:54:03,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860441766] [2021-05-05 23:54:03,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-05 23:54:03,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:03,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-05 23:54:03,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-05 23:54:03,291 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) [2021-05-05 23:54:04,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:04,054 INFO L93 Difference]: Finished difference Result 228 states and 263 transitions. [2021-05-05 23:54:04,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-05 23:54:04,054 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 [2021-05-05 23:54:04,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:04,055 INFO L225 Difference]: With dead ends: 228 [2021-05-05 23:54:04,055 INFO L226 Difference]: Without dead ends: 138 [2021-05-05 23:54:04,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 243.5ms TimeCoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-05 23:54:04,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-05 23:54:04,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 134. [2021-05-05 23:54:04,059 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) [2021-05-05 23:54:04,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 151 transitions. [2021-05-05 23:54:04,060 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 151 transitions. Word has length 53 [2021-05-05 23:54:04,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:04,060 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 151 transitions. [2021-05-05 23:54:04,060 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) [2021-05-05 23:54:04,060 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 151 transitions. [2021-05-05 23:54:04,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-05 23:54:04,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:04,061 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] [2021-05-05 23:54:04,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-05 23:54:04,265 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:04,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:04,265 INFO L82 PathProgramCache]: Analyzing trace with hash 597246331, now seen corresponding path program 15 times [2021-05-05 23:54:04,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:04,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017415315] [2021-05-05 23:54:04,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:04,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:04,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:04,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:04,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-05 23:54:04,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:04,472 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:04,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:04,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017415315] [2021-05-05 23:54:04,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017415315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:04,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118372358] [2021-05-05 23:54:04,472 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 [2021-05-05 23:54:12,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-05 23:54:12,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:54:12,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-05 23:54:12,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:12,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:12,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118372358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:12,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:12,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-05 23:54:12,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183119810] [2021-05-05 23:54:12,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-05 23:54:12,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:12,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-05 23:54:12,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-05 23:54:12,715 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) [2021-05-05 23:54:13,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:13,577 INFO L93 Difference]: Finished difference Result 240 states and 277 transitions. [2021-05-05 23:54:13,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-05 23:54:13,578 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 [2021-05-05 23:54:13,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:13,579 INFO L225 Difference]: With dead ends: 240 [2021-05-05 23:54:13,579 INFO L226 Difference]: Without dead ends: 145 [2021-05-05 23:54:13,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 212.8ms TimeCoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-05 23:54:13,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-05 23:54:13,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2021-05-05 23:54:13,583 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) [2021-05-05 23:54:13,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 159 transitions. [2021-05-05 23:54:13,584 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 159 transitions. Word has length 55 [2021-05-05 23:54:13,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:13,584 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 159 transitions. [2021-05-05 23:54:13,584 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) [2021-05-05 23:54:13,584 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 159 transitions. [2021-05-05 23:54:13,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-05 23:54:13,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:13,585 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] [2021-05-05 23:54:13,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-05 23:54:13,793 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:13,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:13,793 INFO L82 PathProgramCache]: Analyzing trace with hash -165936935, now seen corresponding path program 16 times [2021-05-05 23:54:13,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:13,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418411836] [2021-05-05 23:54:13,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:13,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:14,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:14,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:14,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-05 23:54:14,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:14,042 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:14,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:14,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418411836] [2021-05-05 23:54:14,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418411836] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:14,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912116074] [2021-05-05 23:54:14,043 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 [2021-05-05 23:54:14,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-05 23:54:14,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:54:14,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-05 23:54:14,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:14,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:14,357 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:14,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912116074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:14,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:14,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-05 23:54:14,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603251828] [2021-05-05 23:54:14,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-05 23:54:14,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:14,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-05 23:54:14,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-05 23:54:14,358 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) [2021-05-05 23:54:15,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:15,314 INFO L93 Difference]: Finished difference Result 252 states and 291 transitions. [2021-05-05 23:54:15,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-05 23:54:15,314 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 [2021-05-05 23:54:15,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:15,315 INFO L225 Difference]: With dead ends: 252 [2021-05-05 23:54:15,315 INFO L226 Difference]: Without dead ends: 152 [2021-05-05 23:54:15,315 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 17 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 337.2ms TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-05 23:54:15,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-05 23:54:15,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 148. [2021-05-05 23:54:15,320 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) [2021-05-05 23:54:15,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 167 transitions. [2021-05-05 23:54:15,321 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 167 transitions. Word has length 57 [2021-05-05 23:54:15,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:15,321 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 167 transitions. [2021-05-05 23:54:15,321 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) [2021-05-05 23:54:15,321 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 167 transitions. [2021-05-05 23:54:15,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-05 23:54:15,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:15,321 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] [2021-05-05 23:54:15,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:54:15,529 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:15,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:15,529 INFO L82 PathProgramCache]: Analyzing trace with hash 854352055, now seen corresponding path program 17 times [2021-05-05 23:54:15,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:15,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252009042] [2021-05-05 23:54:15,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:15,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:15,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:15,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:15,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-05 23:54:15,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:15,787 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:15,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:15,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252009042] [2021-05-05 23:54:15,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252009042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:15,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159281700] [2021-05-05 23:54:15,787 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 [2021-05-05 23:54:45,335 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-05 23:54:45,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:54:45,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-05 23:54:45,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:54:45,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:54:45,455 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:54:45,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159281700] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:45,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:54:45,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-05 23:54:45,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484083777] [2021-05-05 23:54:45,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-05 23:54:45,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:54:45,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-05 23:54:45,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-05 23:54:45,457 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) [2021-05-05 23:54:46,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:54:46,463 INFO L93 Difference]: Finished difference Result 264 states and 305 transitions. [2021-05-05 23:54:46,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-05 23:54:46,463 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 [2021-05-05 23:54:46,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:54:46,464 INFO L225 Difference]: With dead ends: 264 [2021-05-05 23:54:46,464 INFO L226 Difference]: Without dead ends: 159 [2021-05-05 23:54:46,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 222.7ms TimeCoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-05 23:54:46,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-05 23:54:46,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2021-05-05 23:54:46,470 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) [2021-05-05 23:54:46,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 175 transitions. [2021-05-05 23:54:46,471 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 175 transitions. Word has length 59 [2021-05-05 23:54:46,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:54:46,471 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 175 transitions. [2021-05-05 23:54:46,471 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) [2021-05-05 23:54:46,471 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 175 transitions. [2021-05-05 23:54:46,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-05 23:54:46,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:54:46,472 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] [2021-05-05 23:54:46,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:54:46,680 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:54:46,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:54:46,681 INFO L82 PathProgramCache]: Analyzing trace with hash 2099527957, now seen corresponding path program 18 times [2021-05-05 23:54:46,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:54:46,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196243172] [2021-05-05 23:54:46,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:54:46,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:46,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:54:46,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:46,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-05 23:54:46,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:54:46,959 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:54:46,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:54:46,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196243172] [2021-05-05 23:54:46,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196243172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:54:46,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445873472] [2021-05-05 23:54:46,960 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 [2021-05-05 23:55:28,794 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2021-05-05 23:55:28,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:55:28,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-05 23:55:28,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:55:28,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:55:28,965 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:55:28,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445873472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:28,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:55:28,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-05 23:55:28,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766352747] [2021-05-05 23:55:28,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-05 23:55:28,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:55:28,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-05 23:55:28,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-05 23:55:28,967 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) [2021-05-05 23:55:30,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:55:30,023 INFO L93 Difference]: Finished difference Result 276 states and 319 transitions. [2021-05-05 23:55:30,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-05 23:55:30,024 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 [2021-05-05 23:55:30,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:55:30,024 INFO L225 Difference]: With dead ends: 276 [2021-05-05 23:55:30,025 INFO L226 Difference]: Without dead ends: 166 [2021-05-05 23:55:30,025 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 272.0ms TimeCoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-05 23:55:30,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-05 23:55:30,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2021-05-05 23:55:30,030 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) [2021-05-05 23:55:30,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 183 transitions. [2021-05-05 23:55:30,030 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 183 transitions. Word has length 61 [2021-05-05 23:55:30,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:55:30,031 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 183 transitions. [2021-05-05 23:55:30,031 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) [2021-05-05 23:55:30,031 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 183 transitions. [2021-05-05 23:55:30,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-05 23:55:30,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:55:30,031 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] [2021-05-05 23:55:30,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:55:30,241 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:55:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:55:30,242 INFO L82 PathProgramCache]: Analyzing trace with hash 417694195, now seen corresponding path program 19 times [2021-05-05 23:55:30,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:55:30,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674064615] [2021-05-05 23:55:30,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:55:30,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:30,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:55:30,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:30,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-05 23:55:30,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:30,531 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:55:30,531 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:55:30,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674064615] [2021-05-05 23:55:30,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674064615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:30,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173562565] [2021-05-05 23:55:30,532 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 [2021-05-05 23:55:30,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:30,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-05 23:55:30,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:55:30,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:55:30,869 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:55:30,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173562565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:30,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:55:30,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-05 23:55:30,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420933071] [2021-05-05 23:55:30,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-05 23:55:30,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:55:30,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-05 23:55:30,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-05 23:55:30,870 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) [2021-05-05 23:55:32,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:55:32,073 INFO L93 Difference]: Finished difference Result 288 states and 333 transitions. [2021-05-05 23:55:32,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-05 23:55:32,073 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 [2021-05-05 23:55:32,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:55:32,074 INFO L225 Difference]: With dead ends: 288 [2021-05-05 23:55:32,074 INFO L226 Difference]: Without dead ends: 173 [2021-05-05 23:55:32,075 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 52 SyntacticMatches, 14 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 393.4ms TimeCoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-05 23:55:32,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-05 23:55:32,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 169. [2021-05-05 23:55:32,079 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) [2021-05-05 23:55:32,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2021-05-05 23:55:32,080 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 63 [2021-05-05 23:55:32,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:55:32,080 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2021-05-05 23:55:32,080 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) [2021-05-05 23:55:32,080 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2021-05-05 23:55:32,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-05 23:55:32,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:55:32,081 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] [2021-05-05 23:55:32,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-05 23:55:32,297 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:55:32,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:55:32,298 INFO L82 PathProgramCache]: Analyzing trace with hash -916847791, now seen corresponding path program 20 times [2021-05-05 23:55:32,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:55:32,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610867166] [2021-05-05 23:55:32,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:55:32,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:32,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:55:32,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:32,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-05 23:55:32,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:32,629 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:55:32,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:55:32,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610867166] [2021-05-05 23:55:32,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610867166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:32,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186146348] [2021-05-05 23:55:32,629 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 [2021-05-05 23:55:32,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-05 23:55:32,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:55:32,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-05 23:55:32,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:55:32,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:55:32,953 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:55:32,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186146348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:32,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:55:32,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-05 23:55:32,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714229290] [2021-05-05 23:55:32,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-05 23:55:32,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:55:32,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-05 23:55:32,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-05 23:55:32,954 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) [2021-05-05 23:55:34,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:55:34,264 INFO L93 Difference]: Finished difference Result 300 states and 347 transitions. [2021-05-05 23:55:34,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-05 23:55:34,264 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 [2021-05-05 23:55:34,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:55:34,265 INFO L225 Difference]: With dead ends: 300 [2021-05-05 23:55:34,265 INFO L226 Difference]: Without dead ends: 180 [2021-05-05 23:55:34,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 52 SyntacticMatches, 16 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 446.8ms TimeCoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-05 23:55:34,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-05 23:55:34,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 176. [2021-05-05 23:55:34,270 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) [2021-05-05 23:55:34,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 199 transitions. [2021-05-05 23:55:34,271 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 199 transitions. Word has length 65 [2021-05-05 23:55:34,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:55:34,271 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 199 transitions. [2021-05-05 23:55:34,271 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) [2021-05-05 23:55:34,271 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 199 transitions. [2021-05-05 23:55:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-05 23:55:34,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:55:34,272 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] [2021-05-05 23:55:34,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-05 23:55:34,476 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:55:34,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:55:34,476 INFO L82 PathProgramCache]: Analyzing trace with hash 783525167, now seen corresponding path program 21 times [2021-05-05 23:55:34,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:55:34,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416238037] [2021-05-05 23:55:34,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:55:34,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:34,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:55:34,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:34,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-05 23:55:34,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:55:34,812 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:55:34,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:55:34,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416238037] [2021-05-05 23:55:34,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416238037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:55:34,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707979167] [2021-05-05 23:55:34,812 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 [2021-05-05 23:56:00,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-05-05 23:56:00,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:56:00,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-05 23:56:00,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:56:00,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:56:00,205 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:56:00,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707979167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:56:00,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:56:00,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-05 23:56:00,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285105126] [2021-05-05 23:56:00,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-05 23:56:00,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:56:00,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-05 23:56:00,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-05 23:56:00,208 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) [2021-05-05 23:56:01,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:56:01,564 INFO L93 Difference]: Finished difference Result 312 states and 361 transitions. [2021-05-05 23:56:01,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-05 23:56:01,565 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 [2021-05-05 23:56:01,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:56:01,565 INFO L225 Difference]: With dead ends: 312 [2021-05-05 23:56:01,566 INFO L226 Difference]: Without dead ends: 187 [2021-05-05 23:56:01,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 335.3ms TimeCoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-05 23:56:01,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-05 23:56:01,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2021-05-05 23:56:01,571 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) [2021-05-05 23:56:01,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 207 transitions. [2021-05-05 23:56:01,572 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 207 transitions. Word has length 67 [2021-05-05 23:56:01,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:56:01,572 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 207 transitions. [2021-05-05 23:56:01,572 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) [2021-05-05 23:56:01,572 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 207 transitions. [2021-05-05 23:56:01,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-05 23:56:01,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:56:01,573 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] [2021-05-05 23:56:01,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:56:01,785 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:56:01,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:56:01,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1540601971, now seen corresponding path program 22 times [2021-05-05 23:56:01,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:56:01,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554610466] [2021-05-05 23:56:01,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:56:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:02,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:56:02,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:02,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-05 23:56:02,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:02,153 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:56:02,153 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:56:02,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554610466] [2021-05-05 23:56:02,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554610466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:56:02,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61437733] [2021-05-05 23:56:02,153 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 [2021-05-05 23:56:02,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-05 23:56:02,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:56:02,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-05 23:56:02,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:56:02,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:56:02,554 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:56:02,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61437733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:56:02,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:56:02,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-05 23:56:02,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570376401] [2021-05-05 23:56:02,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-05 23:56:02,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:56:02,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-05 23:56:02,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-05 23:56:02,555 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) [2021-05-05 23:56:04,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:56:04,065 INFO L93 Difference]: Finished difference Result 324 states and 375 transitions. [2021-05-05 23:56:04,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-05 23:56:04,066 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 [2021-05-05 23:56:04,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:56:04,067 INFO L225 Difference]: With dead ends: 324 [2021-05-05 23:56:04,067 INFO L226 Difference]: Without dead ends: 194 [2021-05-05 23:56:04,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 50 SyntacticMatches, 22 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 542.1ms TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-05 23:56:04,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-05 23:56:04,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 190. [2021-05-05 23:56:04,072 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) [2021-05-05 23:56:04,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 215 transitions. [2021-05-05 23:56:04,073 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 215 transitions. Word has length 69 [2021-05-05 23:56:04,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:56:04,073 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 215 transitions. [2021-05-05 23:56:04,073 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) [2021-05-05 23:56:04,073 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 215 transitions. [2021-05-05 23:56:04,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-05 23:56:04,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:56:04,074 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] [2021-05-05 23:56:04,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-05 23:56:04,289 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:56:04,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:56:04,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1643787669, now seen corresponding path program 23 times [2021-05-05 23:56:04,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:56:04,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499439878] [2021-05-05 23:56:04,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:56:04,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:04,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:56:04,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:04,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-05 23:56:04,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:56:04,726 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:56:04,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:56:04,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499439878] [2021-05-05 23:56:04,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499439878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:56:04,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709143029] [2021-05-05 23:56:04,727 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 [2021-05-05 23:57:39,172 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-05 23:57:39,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-05 23:57:39,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-05 23:57:39,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-05 23:57:39,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-05 23:57:39,340 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-05 23:57:39,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709143029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:57:39,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-05 23:57:39,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-05 23:57:39,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742119820] [2021-05-05 23:57:39,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-05 23:57:39,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-05 23:57:39,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-05 23:57:39,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-05 23:57:39,342 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) [2021-05-05 23:57:40,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-05 23:57:40,958 INFO L93 Difference]: Finished difference Result 336 states and 389 transitions. [2021-05-05 23:57:40,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-05 23:57:40,958 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 [2021-05-05 23:57:40,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-05 23:57:40,959 INFO L225 Difference]: With dead ends: 336 [2021-05-05 23:57:40,959 INFO L226 Difference]: Without dead ends: 201 [2021-05-05 23:57:40,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 372.5ms TimeCoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-05 23:57:40,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-05 23:57:40,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 197. [2021-05-05 23:57:40,965 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) [2021-05-05 23:57:40,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 223 transitions. [2021-05-05 23:57:40,965 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 223 transitions. Word has length 71 [2021-05-05 23:57:40,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-05 23:57:40,966 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 223 transitions. [2021-05-05 23:57:40,966 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) [2021-05-05 23:57:40,966 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 223 transitions. [2021-05-05 23:57:40,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-05 23:57:40,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-05 23:57:40,966 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] [2021-05-05 23:57:41,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-05 23:57:41,180 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-05 23:57:41,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-05 23:57:41,180 INFO L82 PathProgramCache]: Analyzing trace with hash -2020995639, now seen corresponding path program 24 times [2021-05-05 23:57:41,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-05 23:57:41,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899959428] [2021-05-05 23:57:41,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-05 23:57:41,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:57:41,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-05 23:57:41,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:57:41,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-05 23:57:41,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-05 23:57:41,632 INFO L134 CoverageAnalysis]: Checked inductivity of 629 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-05 23:57:41,632 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-05 23:57:41,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899959428] [2021-05-05 23:57:41,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899959428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-05 23:57:41,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297697981] [2021-05-05 23:57:41,632 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 00:01:01,832 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2021-05-06 00:01:01,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:01:01,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-06 00:01:01,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:01:02,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:01:02,038 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 00:01:02,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297697981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:02,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:01:02,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 00:01:02,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872314244] [2021-05-06 00:01:02,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 00:01:02,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:01:02,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 00:01:02,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 00:01:02,039 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 00:01:03,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:01:03,748 INFO L93 Difference]: Finished difference Result 348 states and 403 transitions. [2021-05-06 00:01:03,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 00:01:03,749 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 00:01:03,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:01:03,749 INFO L225 Difference]: With dead ends: 348 [2021-05-06 00:01:03,750 INFO L226 Difference]: Without dead ends: 208 [2021-05-06 00:01:03,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 442.3ms TimeCoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 00:01:03,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-06 00:01:03,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 204. [2021-05-06 00:01:03,756 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 00:01:03,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 231 transitions. [2021-05-06 00:01:03,757 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 231 transitions. Word has length 73 [2021-05-06 00:01:03,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:01:03,757 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 231 transitions. [2021-05-06 00:01:03,757 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 00:01:03,757 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 231 transitions. [2021-05-06 00:01:03,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 00:01:03,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:01:03,757 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 00:01:03,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-06 00:01:03,958 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:01:03,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:01:03,958 INFO L82 PathProgramCache]: Analyzing trace with hash 554365351, now seen corresponding path program 25 times [2021-05-06 00:01:03,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:01:03,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904517217] [2021-05-06 00:01:03,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:01:03,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:04,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:01:04,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:04,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 00:01:04,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:04,389 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 00:01:04,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:01:04,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904517217] [2021-05-06 00:01:04,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904517217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:04,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323354555] [2021-05-06 00:01:04,389 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 00:01:04,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:04,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-06 00:01:04,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:01:04,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:01:04,816 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 00:01:04,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323354555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:04,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:01:04,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-06 00:01:04,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260320473] [2021-05-06 00:01:04,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 00:01:04,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:01:04,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 00:01:04,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 00:01:04,818 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 00:01:06,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:01:06,768 INFO L93 Difference]: Finished difference Result 360 states and 417 transitions. [2021-05-06 00:01:06,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 00:01:06,768 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 00:01:06,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:01:06,769 INFO L225 Difference]: With dead ends: 360 [2021-05-06 00:01:06,769 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 00:01:06,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 60 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 632.2ms TimeCoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 00:01:06,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 00:01:06,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 211. [2021-05-06 00:01:06,776 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 00:01:06,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 239 transitions. [2021-05-06 00:01:06,776 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 239 transitions. Word has length 75 [2021-05-06 00:01:06,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:01:06,777 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 239 transitions. [2021-05-06 00:01:06,777 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 00:01:06,777 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 239 transitions. [2021-05-06 00:01:06,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 00:01:06,777 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:01:06,777 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 00:01:06,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 00:01:06,995 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:01:06,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:01:06,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1575114245, now seen corresponding path program 26 times [2021-05-06 00:01:06,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:01:06,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234834167] [2021-05-06 00:01:06,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:01:07,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:07,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:01:07,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:07,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 00:01:07,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:07,489 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 00:01:07,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:01:07,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234834167] [2021-05-06 00:01:07,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234834167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:07,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783674] [2021-05-06 00:01:07,489 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 00:01:07,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:01:07,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:01:07,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-06 00:01:07,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:01:07,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:01:07,917 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 00:01:07,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:07,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:01:07,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 00:01:07,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688620335] [2021-05-06 00:01:07,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 00:01:07,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:01:07,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 00:01:07,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:01:07,918 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 00:01:09,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:01:09,920 INFO L93 Difference]: Finished difference Result 372 states and 431 transitions. [2021-05-06 00:01:09,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 00:01:09,921 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 00:01:09,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:01:09,922 INFO L225 Difference]: With dead ends: 372 [2021-05-06 00:01:09,922 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 00:01:09,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 641.1ms TimeCoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:01:09,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 00:01:09,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 218. [2021-05-06 00:01:09,928 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 00:01:09,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 247 transitions. [2021-05-06 00:01:09,929 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 247 transitions. Word has length 77 [2021-05-06 00:01:09,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:01:09,929 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 247 transitions. [2021-05-06 00:01:09,930 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 00:01:09,930 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 247 transitions. [2021-05-06 00:01:09,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 00:01:09,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:01:09,930 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 00:01:10,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 00:01:10,141 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:01:10,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:01:10,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1032709405, now seen corresponding path program 27 times [2021-05-06 00:01:10,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:01:10,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344899241] [2021-05-06 00:01:10,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:01:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:10,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:01:10,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:10,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-06 00:01:10,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:01:10,617 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 00:01:10,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:01:10,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344899241] [2021-05-06 00:01:10,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344899241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:01:10,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704610575] [2021-05-06 00:01:10,617 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 00:03:18,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-05-06 00:03:18,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:03:18,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-06 00:03:18,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:03:18,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:03:18,337 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 00:03:18,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704610575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:03:18,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:03:18,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-06 00:03:18,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284564001] [2021-05-06 00:03:18,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 00:03:18,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:03:18,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 00:03:18,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 00:03:18,338 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 00:03:20,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:03:20,350 INFO L93 Difference]: Finished difference Result 384 states and 445 transitions. [2021-05-06 00:03:20,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 00:03:20,350 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 00:03:20,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:03:20,351 INFO L225 Difference]: With dead ends: 384 [2021-05-06 00:03:20,351 INFO L226 Difference]: Without dead ends: 229 [2021-05-06 00:03:20,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 458.0ms TimeCoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 00:03:20,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-06 00:03:20,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 225. [2021-05-06 00:03:20,358 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 00:03:20,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 255 transitions. [2021-05-06 00:03:20,358 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 255 transitions. Word has length 79 [2021-05-06 00:03:20,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:03:20,359 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 255 transitions. [2021-05-06 00:03:20,359 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 00:03:20,359 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 255 transitions. [2021-05-06 00:03:20,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 00:03:20,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:03:20,359 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 00:03:20,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:03:20,560 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:03:20,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:03:20,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1109663809, now seen corresponding path program 28 times [2021-05-06 00:03:20,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:03:20,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536455101] [2021-05-06 00:03:20,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:03:20,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:21,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:03:21,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:21,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2021-05-06 00:03:21,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:21,062 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 00:03:21,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:03:21,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536455101] [2021-05-06 00:03:21,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536455101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:03:21,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312111131] [2021-05-06 00:03:21,063 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 00:03:21,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:03:21,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:03:21,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-06 00:03:21,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:03:21,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:03:21,603 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 00:03:21,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312111131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:03:21,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:03:21,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-06 00:03:21,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381554540] [2021-05-06 00:03:21,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 00:03:21,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:03:21,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 00:03:21,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:03:21,604 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 00:03:23,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:03:23,796 INFO L93 Difference]: Finished difference Result 396 states and 459 transitions. [2021-05-06 00:03:23,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 00:03:23,796 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 00:03:23,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:03:23,797 INFO L225 Difference]: With dead ends: 396 [2021-05-06 00:03:23,797 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 00:03:23,797 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 28 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 809.7ms TimeCoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:03:23,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 00:03:23,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 232. [2021-05-06 00:03:23,804 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 00:03:23,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 263 transitions. [2021-05-06 00:03:23,805 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 263 transitions. Word has length 81 [2021-05-06 00:03:23,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:03:23,805 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 263 transitions. [2021-05-06 00:03:23,805 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 00:03:23,805 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 263 transitions. [2021-05-06 00:03:23,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 00:03:23,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:03:23,805 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 00:03:24,022 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-06 00:03:24,022 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:03:24,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:03:24,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1653979617, now seen corresponding path program 29 times [2021-05-06 00:03:24,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:03:24,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996193258] [2021-05-06 00:03:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:03:24,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:24,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:03:24,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:24,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-06 00:03:24,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:03:24,542 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 00:03:24,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:03:24,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996193258] [2021-05-06 00:03:24,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996193258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:03:24,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379626625] [2021-05-06 00:03:24,542 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