/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:37:15,086 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:37:15,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:37:15,112 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 05:37:15,150 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:37:15,151 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:37:15,151 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:37:15,152 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 05:37:15,161 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:37:15,161 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:37:15,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:37:15,163 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:37:15,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:37:15,164 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 05:37:15,165 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:37:15,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:37:15,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:37:15,165 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:37:15,166 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 05:37:15,166 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:37:15,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:37:15,479 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:37:15,482 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:37:15,482 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:37:15,483 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:37:15,484 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-06 05:37:15,559 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b460fb482/4247f1e412794fa4982badd5e062cb60/FLAG7aad0da54 [2021-05-06 05:37:16,009 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:37:16,010 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-06 05:37:16,014 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b460fb482/4247f1e412794fa4982badd5e062cb60/FLAG7aad0da54 [2021-05-06 05:37:16,467 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b460fb482/4247f1e412794fa4982badd5e062cb60 [2021-05-06 05:37:16,471 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:37:16,474 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 05:37:16,478 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:37:16,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:37:16,482 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:37:16,483 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,484 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656be22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16, skipping insertion in model container [2021-05-06 05:37:16,484 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,490 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:37:16,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:37:16,637 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i[849,862] [2021-05-06 05:37:16,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:37:16,654 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:37:16,664 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i[849,862] [2021-05-06 05:37:16,669 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:37:16,680 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:37:16,681 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16 WrapperNode [2021-05-06 05:37:16,681 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:37:16,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:37:16,682 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:37:16,682 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:37:16,698 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,707 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,708 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,742 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,745 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... [2021-05-06 05:37:16,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:37:16,756 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:37:16,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:37:16,756 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:37:16,757 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:37:16,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:37:16,825 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:37:16,825 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:37:16,825 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:37:16,825 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:37:16,826 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:37:16,826 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:37:16,826 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 05:37:16,826 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 05:37:16,826 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:37:16,827 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:37:16,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 05:37:16,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:37:16,827 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:37:16,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:37:16,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:37:16,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:37:16,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:37:16,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:37:16,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:37:17,123 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:37:17,123 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 05:37:17,124 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:37:17 BoogieIcfgContainer [2021-05-06 05:37:17,125 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:37:17,125 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 05:37:17,125 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 05:37:17,126 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 05:37:17,128 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:37:17" (1/1) ... [2021-05-06 05:37:17,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 05:37:17 BasicIcfg [2021-05-06 05:37:17,139 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 05:37:17,141 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:37:17,141 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:37:17,143 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:37:17,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:37:16" (1/4) ... [2021-05-06 05:37:17,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c84d93e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:37:17, skipping insertion in model container [2021-05-06 05:37:17,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:37:16" (2/4) ... [2021-05-06 05:37:17,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c84d93e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:37:17, skipping insertion in model container [2021-05-06 05:37:17,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:37:17" (3/4) ... [2021-05-06 05:37:17,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c84d93e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 05:37:17, skipping insertion in model container [2021-05-06 05:37:17,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 05:37:17" (4/4) ... [2021-05-06 05:37:17,146 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.iJordan [2021-05-06 05:37:17,150 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:37:17,154 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:37:17,168 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:37:17,183 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:37:17,184 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 05:37:17,184 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 05:37:17,184 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:37:17,184 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:37:17,184 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:37:17,184 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:37:17,184 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:37:17,207 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:37:17,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 05:37:17,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:17,213 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:17,214 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:17,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:17,223 INFO L82 PathProgramCache]: Analyzing trace with hash -742242332, now seen corresponding path program 1 times [2021-05-06 05:37:17,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:17,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131046201] [2021-05-06 05:37:17,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:17,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:17,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:37:17,475 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:17,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131046201] [2021-05-06 05:37:17,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131046201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:37:17,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:37:17,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:37:17,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515622161] [2021-05-06 05:37:17,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:37:17,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:17,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:37:17,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:37:17,493 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:17,546 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-06 05:37:17,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:37:17,548 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 05:37:17,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:17,553 INFO L225 Difference]: With dead ends: 24 [2021-05-06 05:37:17,554 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 05:37:17,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:37:17,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 05:37:17,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 05:37:17,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-06 05:37:17,578 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-06 05:37:17,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:17,579 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-06 05:37:17,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,579 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-06 05:37:17,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 05:37:17,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:17,580 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:17,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:37:17,581 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:17,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:17,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1029197154, now seen corresponding path program 1 times [2021-05-06 05:37:17,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:17,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557802865] [2021-05-06 05:37:17,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:17,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:17,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:37:17,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557802865] [2021-05-06 05:37:17,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557802865] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:37:17,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:37:17,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 05:37:17,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684753509] [2021-05-06 05:37:17,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 05:37:17,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:17,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 05:37:17,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:37:17,652 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:17,718 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-06 05:37:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 05:37:17,719 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 05:37:17,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:17,720 INFO L225 Difference]: With dead ends: 21 [2021-05-06 05:37:17,720 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 05:37:17,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:37:17,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 05:37:17,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-06 05:37:17,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-06 05:37:17,727 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-06 05:37:17,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:17,727 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-06 05:37:17,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:17,728 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-06 05:37:17,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 05:37:17,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:17,728 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:17,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 05:37:17,729 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:17,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:17,729 INFO L82 PathProgramCache]: Analyzing trace with hash 559300038, now seen corresponding path program 1 times [2021-05-06 05:37:17,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:17,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640136713] [2021-05-06 05:37:17,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:17,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:17,843 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 05:37:17,843 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:17,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640136713] [2021-05-06 05:37:17,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640136713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:17,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274697263] [2021-05-06 05:37:17,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:18,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:18,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-06 05:37:18,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:18,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 05:37:18,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274697263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:18,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:18,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 05:37:18,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642604095] [2021-05-06 05:37:18,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:37:18,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:18,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:37:18,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:37:18,123 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:18,201 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-05-06 05:37:18,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:37:18,202 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-06 05:37:18,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:18,203 INFO L225 Difference]: With dead ends: 25 [2021-05-06 05:37:18,203 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 05:37:18,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 55.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:37:18,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 05:37:18,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-06 05:37:18,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-06 05:37:18,209 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-05-06 05:37:18,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:18,209 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-06 05:37:18,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,209 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-06 05:37:18,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 05:37:18,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:18,210 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:18,435 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 05:37:18,436 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:18,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:18,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1242233814, now seen corresponding path program 2 times [2021-05-06 05:37:18,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:18,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121328016] [2021-05-06 05:37:18,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:18,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:18,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:18,556 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:37:18,556 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:18,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121328016] [2021-05-06 05:37:18,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121328016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:18,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718025178] [2021-05-06 05:37:18,557 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:18,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:37:18,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:18,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-06 05:37:18,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:18,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:18,721 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:37:18,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718025178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:18,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:18,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 05:37:18,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062940262] [2021-05-06 05:37:18,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:37:18,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:18,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:37:18,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:37:18,724 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:18,791 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-05-06 05:37:18,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:37:18,792 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-06 05:37:18,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:18,792 INFO L225 Difference]: With dead ends: 29 [2021-05-06 05:37:18,792 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 05:37:18,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:37:18,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 05:37:18,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-06 05:37:18,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-06 05:37:18,796 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-05-06 05:37:18,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:18,797 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-06 05:37:18,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:18,797 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-06 05:37:18,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 05:37:18,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:18,798 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:19,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:19,023 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:19,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:19,024 INFO L82 PathProgramCache]: Analyzing trace with hash -342908786, now seen corresponding path program 3 times [2021-05-06 05:37:19,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:19,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757255362] [2021-05-06 05:37:19,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:19,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:19,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:19,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:19,173 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 05:37:19,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:19,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757255362] [2021-05-06 05:37:19,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757255362] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:19,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609613733] [2021-05-06 05:37:19,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:19,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 05:37:19,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:19,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 05:37:19,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:19,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,358 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 05:37:19,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609613733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:19,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:19,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-06 05:37:19,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61830324] [2021-05-06 05:37:19,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 05:37:19,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:19,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 05:37:19,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:37:19,366 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:19,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:19,445 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2021-05-06 05:37:19,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:37:19,446 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 05:37:19,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:19,448 INFO L225 Difference]: With dead ends: 33 [2021-05-06 05:37:19,448 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 05:37:19,449 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 75.0ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:37:19,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 05:37:19,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-06 05:37:19,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:19,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-06 05:37:19,457 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-06 05:37:19,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:19,457 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-06 05:37:19,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:19,458 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-06 05:37:19,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 05:37:19,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:19,459 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:19,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:19,675 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:19,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:19,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1216277774, now seen corresponding path program 4 times [2021-05-06 05:37:19,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:19,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037479496] [2021-05-06 05:37:19,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:19,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:19,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:19,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:19,781 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 05:37:19,783 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:19,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037479496] [2021-05-06 05:37:19,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037479496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:19,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732159260] [2021-05-06 05:37:19,783 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:19,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:37:19,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:19,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-06 05:37:19,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:19,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:19,963 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 05:37:19,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732159260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:19,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:19,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-06 05:37:19,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977929374] [2021-05-06 05:37:19,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:37:19,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:19,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:37:19,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:37:19,965 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:20,045 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-05-06 05:37:20,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:37:20,046 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-06 05:37:20,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:20,049 INFO L225 Difference]: With dead ends: 37 [2021-05-06 05:37:20,049 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 05:37:20,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 51.3ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:37:20,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 05:37:20,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-05-06 05:37:20,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-06 05:37:20,058 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2021-05-06 05:37:20,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:20,058 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-06 05:37:20,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,061 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-06 05:37:20,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:37:20,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:20,063 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:20,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:20,287 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:20,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:20,288 INFO L82 PathProgramCache]: Analyzing trace with hash -198943914, now seen corresponding path program 5 times [2021-05-06 05:37:20,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:20,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386945975] [2021-05-06 05:37:20,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:20,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:20,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:20,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 05:37:20,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:20,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386945975] [2021-05-06 05:37:20,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386945975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:20,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484698472] [2021-05-06 05:37:20,396 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:20,776 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 05:37:20,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:20,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:37:20,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:20,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:20,896 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 05:37:20,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484698472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:20,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:20,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 05:37:20,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48398348] [2021-05-06 05:37:20,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:37:20,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:20,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:37:20,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:37:20,898 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:20,954 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2021-05-06 05:37:20,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 05:37:20,954 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-06 05:37:20,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:20,955 INFO L225 Difference]: With dead ends: 41 [2021-05-06 05:37:20,955 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 05:37:20,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 50.4ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:37:20,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 05:37:20,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-05-06 05:37:20,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-06 05:37:20,958 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-05-06 05:37:20,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:20,958 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-06 05:37:20,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-06 05:37:20,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 05:37:20,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:20,959 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:21,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 05:37:21,181 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:21,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:21,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1087666618, now seen corresponding path program 6 times [2021-05-06 05:37:21,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:21,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725622473] [2021-05-06 05:37:21,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:21,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:21,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:21,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:21,267 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 05:37:21,267 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:21,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725622473] [2021-05-06 05:37:21,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725622473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:21,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286737992] [2021-05-06 05:37:21,267 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:21,406 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 05:37:21,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:21,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 05:37:21,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:21,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,521 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 05:37:21,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286737992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:21,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:21,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 05:37:21,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470520360] [2021-05-06 05:37:21,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:37:21,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:21,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:37:21,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:37:21,523 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:21,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:21,595 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-05-06 05:37:21,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:37:21,595 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 05:37:21,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:21,596 INFO L225 Difference]: With dead ends: 45 [2021-05-06 05:37:21,596 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 05:37:21,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 52.4ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:37:21,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 05:37:21,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-06 05:37:21,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:21,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-06 05:37:21,599 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-05-06 05:37:21,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:21,600 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-06 05:37:21,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:21,600 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-06 05:37:21,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 05:37:21,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:21,600 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:21,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:21,803 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:21,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:21,804 INFO L82 PathProgramCache]: Analyzing trace with hash -504599010, now seen corresponding path program 7 times [2021-05-06 05:37:21,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:21,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029157447] [2021-05-06 05:37:21,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:21,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:21,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:21,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:21,900 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 05:37:21,900 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:21,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029157447] [2021-05-06 05:37:21,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029157447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:21,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861378386] [2021-05-06 05:37:21,900 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:21,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:21,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 05:37:21,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:21,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:21,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,043 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 05:37:22,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861378386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:22,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:22,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 05:37:22,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939819517] [2021-05-06 05:37:22,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:37:22,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:22,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:37:22,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:37:22,045 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:22,144 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-05-06 05:37:22,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 05:37:22,144 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-06 05:37:22,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:22,148 INFO L225 Difference]: With dead ends: 49 [2021-05-06 05:37:22,148 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 05:37:22,148 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 64.5ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:37:22,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 05:37:22,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-06 05:37:22,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-06 05:37:22,161 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2021-05-06 05:37:22,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:22,161 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-06 05:37:22,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,161 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-06 05:37:22,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 05:37:22,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:22,162 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:22,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:22,362 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:22,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:22,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1597556606, now seen corresponding path program 8 times [2021-05-06 05:37:22,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:22,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193308759] [2021-05-06 05:37:22,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:22,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:22,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:22,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:22,472 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 05:37:22,473 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:22,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193308759] [2021-05-06 05:37:22,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193308759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:22,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098981814] [2021-05-06 05:37:22,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:22,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:37:22,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:22,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 05:37:22,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:22,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:22,662 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 05:37:22,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098981814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:22,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:22,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-06 05:37:22,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045587257] [2021-05-06 05:37:22,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:37:22,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:22,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:37:22,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:37:22,664 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:22,751 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-06 05:37:22,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:37:22,752 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-06 05:37:22,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:22,753 INFO L225 Difference]: With dead ends: 53 [2021-05-06 05:37:22,753 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 05:37:22,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 69.2ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:37:22,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 05:37:22,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-06 05:37:22,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-06 05:37:22,756 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-05-06 05:37:22,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:22,756 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-06 05:37:22,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:22,757 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-06 05:37:22,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 05:37:22,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:22,757 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:22,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:37:22,961 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:22,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:22,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1413490458, now seen corresponding path program 9 times [2021-05-06 05:37:22,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:22,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353706601] [2021-05-06 05:37:22,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:22,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:23,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:23,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:23,078 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 05:37:23,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:23,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353706601] [2021-05-06 05:37:23,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353706601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:23,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714039481] [2021-05-06 05:37:23,079 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:24,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 05:37:24,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:24,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:37:24,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:24,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:24,686 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 05:37:24,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714039481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:24,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:24,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 05:37:24,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983874370] [2021-05-06 05:37:24,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:37:24,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:24,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:37:24,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:37:24,688 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:24,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:24,791 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2021-05-06 05:37:24,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 05:37:24,791 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 05:37:24,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:24,792 INFO L225 Difference]: With dead ends: 57 [2021-05-06 05:37:24,792 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 05:37:24,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 79.4ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:37:24,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 05:37:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-06 05:37:24,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:24,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-06 05:37:24,795 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-06 05:37:24,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:24,795 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-06 05:37:24,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:24,796 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-06 05:37:24,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 05:37:24,796 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:24,796 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:25,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:25,011 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:25,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:25,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1982943050, now seen corresponding path program 10 times [2021-05-06 05:37:25,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:25,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092279935] [2021-05-06 05:37:25,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:25,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:25,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:25,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:25,166 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 05:37:25,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:25,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092279935] [2021-05-06 05:37:25,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092279935] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:25,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953840832] [2021-05-06 05:37:25,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:25,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:37:25,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:25,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:37:25,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:25,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 05:37:25,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953840832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:25,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:25,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-06 05:37:25,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974694438] [2021-05-06 05:37:25,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 05:37:25,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:25,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 05:37:25,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:37:25,359 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:25,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:25,456 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-05-06 05:37:25,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:37:25,456 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-06 05:37:25,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:25,457 INFO L225 Difference]: With dead ends: 61 [2021-05-06 05:37:25,457 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 05:37:25,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 112.3ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:37:25,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 05:37:25,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-06 05:37:25,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:25,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-06 05:37:25,460 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2021-05-06 05:37:25,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:25,460 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-06 05:37:25,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:25,461 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-06 05:37:25,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 05:37:25,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:25,461 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:25,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:25,677 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:25,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:25,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1737057362, now seen corresponding path program 11 times [2021-05-06 05:37:25,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:25,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761721162] [2021-05-06 05:37:25,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:25,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:25,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:25,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:25,840 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 05:37:25,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:25,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761721162] [2021-05-06 05:37:25,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761721162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:25,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192344959] [2021-05-06 05:37:25,841 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:53,825 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 05:37:53,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:53,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 05:37:53,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:53,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:53,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:54,031 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 05:37:54,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192344959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:54,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:54,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-06 05:37:54,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215351002] [2021-05-06 05:37:54,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 05:37:54,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:54,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 05:37:54,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:37:54,033 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:54,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:54,152 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2021-05-06 05:37:54,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 05:37:54,153 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-06 05:37:54,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:54,153 INFO L225 Difference]: With dead ends: 65 [2021-05-06 05:37:54,153 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 05:37:54,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 103.7ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:37:54,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 05:37:54,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-05-06 05:37:54,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:54,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-06 05:37:54,157 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-05-06 05:37:54,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:54,157 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-06 05:37:54,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:54,157 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-06 05:37:54,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 05:37:54,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:54,158 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:54,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 05:37:54,373 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:54,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:54,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1343570414, now seen corresponding path program 12 times [2021-05-06 05:37:54,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:54,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889944633] [2021-05-06 05:37:54,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:54,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:54,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:54,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:54,536 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 05:37:54,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:54,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889944633] [2021-05-06 05:37:54,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889944633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:54,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819533043] [2021-05-06 05:37:54,537 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:59,127 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 05:37:59,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:37:59,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 05:37:59,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:59,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,307 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 05:37:59,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819533043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:59,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:37:59,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-06 05:37:59,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831391917] [2021-05-06 05:37:59,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 05:37:59,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:37:59,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 05:37:59,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:37:59,309 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:59,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:37:59,421 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2021-05-06 05:37:59,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:37:59,421 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 05:37:59,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:37:59,422 INFO L225 Difference]: With dead ends: 71 [2021-05-06 05:37:59,422 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 05:37:59,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 140.8ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:37:59,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 05:37:59,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-06 05:37:59,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:59,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-06 05:37:59,425 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 62 [2021-05-06 05:37:59,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:37:59,425 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-06 05:37:59,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:37:59,426 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-06 05:37:59,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 05:37:59,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:37:59,426 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:37:59,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 05:37:59,640 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:37:59,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:37:59,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1932819238, now seen corresponding path program 13 times [2021-05-06 05:37:59,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:37:59,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458022832] [2021-05-06 05:37:59,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:37:59,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:59,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:37:59,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:59,835 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 05:37:59,835 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:37:59,835 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458022832] [2021-05-06 05:37:59,835 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458022832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:37:59,835 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275541127] [2021-05-06 05:37:59,836 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:37:59,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:37:59,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 05:37:59,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:37:59,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:37:59,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,058 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 05:38:00,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275541127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:00,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:38:00,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 05:38:00,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038460799] [2021-05-06 05:38:00,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 05:38:00,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:38:00,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 05:38:00,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:38:00,063 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:00,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:38:00,213 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2021-05-06 05:38:00,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:38:00,214 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-06 05:38:00,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:38:00,215 INFO L225 Difference]: With dead ends: 77 [2021-05-06 05:38:00,215 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 05:38:00,215 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 153.0ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 05:38:00,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 05:38:00,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-06 05:38:00,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:00,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-06 05:38:00,218 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-05-06 05:38:00,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:38:00,218 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-06 05:38:00,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:00,219 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-06 05:38:00,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 05:38:00,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:38:00,219 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:38:00,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 05:38:00,437 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:38:00,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:38:00,437 INFO L82 PathProgramCache]: Analyzing trace with hash -2047989442, now seen corresponding path program 14 times [2021-05-06 05:38:00,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:38:00,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071954975] [2021-05-06 05:38:00,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:38:00,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:00,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:38:00,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:00,637 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 05:38:00,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:38:00,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071954975] [2021-05-06 05:38:00,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071954975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:00,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268188069] [2021-05-06 05:38:00,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:38:00,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:38:00,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:38:00,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 05:38:00,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:38:00,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 05:38:00,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268188069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:00,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:38:00,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 05:38:00,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608401459] [2021-05-06 05:38:00,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 05:38:00,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:38:00,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 05:38:00,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:38:00,885 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:01,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:38:01,021 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2021-05-06 05:38:01,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 05:38:01,021 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 05:38:01,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:38:01,022 INFO L225 Difference]: With dead ends: 81 [2021-05-06 05:38:01,022 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 05:38:01,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 154.6ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:38:01,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 05:38:01,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-06 05:38:01,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:01,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-06 05:38:01,027 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-06 05:38:01,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:38:01,028 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-06 05:38:01,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:01,028 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-06 05:38:01,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 05:38:01,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:38:01,029 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:38:01,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:38:01,241 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:38:01,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:38:01,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1683250270, now seen corresponding path program 15 times [2021-05-06 05:38:01,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:38:01,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283585135] [2021-05-06 05:38:01,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:38:01,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:01,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:38:01,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:01,466 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 05:38:01,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:38:01,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283585135] [2021-05-06 05:38:01,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283585135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:01,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785752588] [2021-05-06 05:38:01,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:38:14,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-06 05:38:14,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:38:14,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-06 05:38:14,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:38:14,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:14,973 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 05:38:14,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785752588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:14,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:38:14,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-06 05:38:14,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707804854] [2021-05-06 05:38:14,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 05:38:14,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:38:14,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 05:38:14,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 05:38:14,974 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:38:15,078 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2021-05-06 05:38:15,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 05:38:15,078 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-06 05:38:15,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:38:15,079 INFO L225 Difference]: With dead ends: 85 [2021-05-06 05:38:15,079 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 05:38:15,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 174.3ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 05:38:15,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 05:38:15,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-06 05:38:15,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-06 05:38:15,081 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2021-05-06 05:38:15,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:38:15,081 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-06 05:38:15,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,082 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-06 05:38:15,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 05:38:15,082 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:38:15,082 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:38:15,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 05:38:15,293 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:38:15,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:38:15,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1537281018, now seen corresponding path program 16 times [2021-05-06 05:38:15,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:38:15,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395143297] [2021-05-06 05:38:15,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:38:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:15,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:38:15,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 05:38:15,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:38:15,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395143297] [2021-05-06 05:38:15,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395143297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:15,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439658742] [2021-05-06 05:38:15,566 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:38:15,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:38:15,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:38:15,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 05:38:15,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:38:15,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:38:15,817 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 05:38:15,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439658742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:15,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 05:38:15,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-06 05:38:15,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455797166] [2021-05-06 05:38:15,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 05:38:15,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:38:15,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 05:38:15,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:38:15,819 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:38:15,965 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2021-05-06 05:38:15,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 05:38:15,966 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 05:38:15,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:38:15,967 INFO L225 Difference]: With dead ends: 89 [2021-05-06 05:38:15,967 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 05:38:15,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 212.2ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:38:15,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 05:38:15,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-06 05:38:15,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-06 05:38:15,970 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-05-06 05:38:15,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:38:15,970 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-06 05:38:15,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:38:15,970 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-06 05:38:15,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 05:38:15,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:38:15,971 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:38:16,185 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 05:38:16,185 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:38:16,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:38:16,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1151133078, now seen corresponding path program 17 times [2021-05-06 05:38:16,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:38:16,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415470753] [2021-05-06 05:38:16,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:38:16,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:16,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:38:16,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:38:16,453 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-05-06 05:38:16,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:38:16,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415470753] [2021-05-06 05:38:16,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415470753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:38:16,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372278870] [2021-05-06 05:38:16,453 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true