/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/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:52:40,186 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:52:40,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:52:40,211 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:52:40,211 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:52:40,212 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:52:40,213 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:52:40,215 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:52:40,223 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:52:40,224 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:52:40,225 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:52:40,226 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:52:40,226 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:52:40,227 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:52:40,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:52:40,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:52:40,229 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:52:40,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:52:40,231 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:52:40,233 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:52:40,234 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:52:40,235 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:52:40,236 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:52:40,237 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:52:40,239 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:52:40,247 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:52:40,247 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:52:40,248 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:52:40,249 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:52:40,258 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:52:40,258 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:52:40,259 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:52:40,260 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:52:40,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:52:40,261 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:52:40,261 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:52:40,261 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:52:40,261 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:52:40,262 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:52:40,262 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:52:40,262 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:52:40,262 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:52:40,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:52:40,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:52:40,263 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:52:40,263 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:52:40,264 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:52:40,526 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:52:40,542 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:52:40,545 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:52:40,546 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:52:40,546 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:52:40,547 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-02 18:52:40,602 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0bb847ed7/686a47f77fa0470593093055df3c9dd7/FLAG8ab92c3ee [2021-05-02 18:52:41,032 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:52:41,032 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-02 18:52:41,038 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0bb847ed7/686a47f77fa0470593093055df3c9dd7/FLAG8ab92c3ee [2021-05-02 18:52:41,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0bb847ed7/686a47f77fa0470593093055df3c9dd7 [2021-05-02 18:52:41,423 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:52:41,426 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:52:41,428 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:52:41,429 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:52:41,431 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:52:41,432 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49ec56c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41, skipping insertion in model container [2021-05-02 18:52:41,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:52:41,454 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:52:41,577 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2021-05-02 18:52:41,589 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:52:41,596 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:52:41,606 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2021-05-02 18:52:41,611 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:52:41,623 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:52:41,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41 WrapperNode [2021-05-02 18:52:41,624 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:52:41,626 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:52:41,626 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:52:41,626 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:52:41,648 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,655 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,671 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,676 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,681 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... [2021-05-02 18:52:41,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:52:41,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:52:41,688 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:52:41,688 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:52:41,689 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:52:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:52:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:52:41,787 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:52:41,787 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:52:41,787 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:52:41,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:52:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:52:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:52:41,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:52:41,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:52:41,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:52:41,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:52:41,790 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:52:41,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:52:42,126 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:52:42,127 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 18:52:42,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:42 BoogieIcfgContainer [2021-05-02 18:52:42,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:52:42,129 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:52:42,129 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:52:42,130 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:52:42,132 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:42" (1/1) ... [2021-05-02 18:52:42,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:52:42 BasicIcfg [2021-05-02 18:52:42,149 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:52:42,151 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:52:42,151 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:52:42,156 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:52:42,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:52:41" (1/4) ... [2021-05-02 18:52:42,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40c8a94b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:52:42, skipping insertion in model container [2021-05-02 18:52:42,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:41" (2/4) ... [2021-05-02 18:52:42,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40c8a94b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:52:42, skipping insertion in model container [2021-05-02 18:52:42,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:42" (3/4) ... [2021-05-02 18:52:42,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40c8a94b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:52:42, skipping insertion in model container [2021-05-02 18:52:42,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:52:42" (4/4) ... [2021-05-02 18:52:42,160 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.cJordan [2021-05-02 18:52:42,165 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:52:42,169 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:52:42,185 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:52:42,211 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:52:42,211 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:52:42,212 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:52:42,212 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:52:42,212 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:52:42,212 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:52:42,212 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:52:42,212 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:52:42,227 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 18:52:42,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:52:42,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:42,235 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:42,236 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:42,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:42,242 INFO L82 PathProgramCache]: Analyzing trace with hash -414317756, now seen corresponding path program 1 times [2021-05-02 18:52:42,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:42,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703198201] [2021-05-02 18:52:42,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:42,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:42,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:42,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:42,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:42,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703198201] [2021-05-02 18:52:42,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703198201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:42,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:42,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:52:42,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722126951] [2021-05-02 18:52:42,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:52:42,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:42,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:52:42,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:52:42,533 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:42,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:42,625 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 18:52:42,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:52:42,627 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 18:52:42,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:42,638 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:52:42,639 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 18:52:42,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 75.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:52:42,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 18:52:42,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 18:52:42,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:52:42,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-02 18:52:42,670 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2021-05-02 18:52:42,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:42,671 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-02 18:52:42,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:42,671 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-02 18:52:42,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:52:42,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:42,673 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:42,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:52:42,673 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:42,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:42,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1035089572, now seen corresponding path program 1 times [2021-05-02 18:52:42,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:42,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376981937] [2021-05-02 18:52:42,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:42,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:42,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:42,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:42,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:42,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376981937] [2021-05-02 18:52:42,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376981937] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:42,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:42,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 18:52:42,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227075558] [2021-05-02 18:52:42,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:52:42,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:42,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:52:42,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:52:42,886 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:43,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:43,035 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-05-02 18:52:43,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:52:43,035 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-02 18:52:43,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:43,036 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:52:43,036 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:52:43,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 104.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:52:43,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:52:43,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 18:52:43,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:52:43,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 18:52:43,041 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2021-05-02 18:52:43,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:43,042 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 18:52:43,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:43,042 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 18:52:43,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:52:43,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:43,043 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:43,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:52:43,043 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:43,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:43,044 INFO L82 PathProgramCache]: Analyzing trace with hash -2124918270, now seen corresponding path program 1 times [2021-05-02 18:52:43,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:43,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767404957] [2021-05-02 18:52:43,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:43,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:43,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:52:43,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:43,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767404957] [2021-05-02 18:52:43,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767404957] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:43,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:43,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:52:43,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245072275] [2021-05-02 18:52:43,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:52:43,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:43,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:52:43,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:43,113 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:43,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:43,273 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2021-05-02 18:52:43,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:52:43,273 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-02 18:52:43,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:43,275 INFO L225 Difference]: With dead ends: 33 [2021-05-02 18:52:43,275 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 18:52:43,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:43,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 18:52:43,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2021-05-02 18:52:43,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:52:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-05-02 18:52:43,282 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2021-05-02 18:52:43,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:43,282 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-05-02 18:52:43,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:43,283 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-05-02 18:52:43,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:52:43,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:43,283 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:43,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:52:43,284 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:43,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:43,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1237414589, now seen corresponding path program 1 times [2021-05-02 18:52:43,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:43,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205604193] [2021-05-02 18:52:43,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:43,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:43,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:43,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:52:43,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:43,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205604193] [2021-05-02 18:52:43,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205604193] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:43,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:43,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:52:43,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662215764] [2021-05-02 18:52:43,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:52:43,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:43,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:52:43,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:52:43,424 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:43,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:43,573 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2021-05-02 18:52:43,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:52:43,574 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), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 18:52:43,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:43,576 INFO L225 Difference]: With dead ends: 40 [2021-05-02 18:52:43,576 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 18:52:43,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 89.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:52:43,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 18:52:43,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 18:52:43,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 32 states have internal predecessors, (43), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 18:52:43,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-05-02 18:52:43,582 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 24 [2021-05-02 18:52:43,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:43,582 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-05-02 18:52:43,582 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), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:43,582 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-05-02 18:52:43,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:52:43,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:43,583 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:43,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 18:52:43,583 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:43,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:43,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1236491068, now seen corresponding path program 1 times [2021-05-02 18:52:43,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:43,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176332972] [2021-05-02 18:52:43,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:43,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:43,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:43,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:43,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:43,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176332972] [2021-05-02 18:52:43,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176332972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:43,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217855606] [2021-05-02 18:52:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:43,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:52:43,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:43,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:43,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:43,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:43,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217855606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:43,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:43,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2021-05-02 18:52:43,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002331116] [2021-05-02 18:52:43,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:52:43,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:43,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:52:43,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:52:43,990 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:44,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:44,172 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2021-05-02 18:52:44,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:52:44,175 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 18:52:44,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:44,178 INFO L225 Difference]: With dead ends: 51 [2021-05-02 18:52:44,178 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 18:52:44,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:52:44,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 18:52:44,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2021-05-02 18:52:44,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 38 states have internal predecessors, (51), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 18:52:44,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-05-02 18:52:44,188 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 24 [2021-05-02 18:52:44,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:44,189 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-05-02 18:52:44,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:44,189 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-05-02 18:52:44,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:52:44,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:44,190 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:44,411 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:44,412 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:44,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:44,412 INFO L82 PathProgramCache]: Analyzing trace with hash 358048934, now seen corresponding path program 2 times [2021-05-02 18:52:44,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:44,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897351955] [2021-05-02 18:52:44,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:44,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:44,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:44,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:44,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:44,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897351955] [2021-05-02 18:52:44,510 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897351955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:44,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217373453] [2021-05-02 18:52:44,510 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:44,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:44,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:44,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:52:44,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:44,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:44,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:44,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:52:44,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217373453] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:44,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:52:44,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2021-05-02 18:52:44,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134112995] [2021-05-02 18:52:44,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:52:44,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:44,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:52:44,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:52:44,674 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:44,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:44,780 INFO L93 Difference]: Finished difference Result 73 states and 95 transitions. [2021-05-02 18:52:44,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:52:44,781 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2021-05-02 18:52:44,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:44,782 INFO L225 Difference]: With dead ends: 73 [2021-05-02 18:52:44,782 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 18:52:44,782 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 86.9ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:52:44,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 18:52:44,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 62. [2021-05-02 18:52:44,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.3725490196078431) internal successors, (70), 52 states have internal predecessors, (70), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:52:44,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-05-02 18:52:44,788 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 27 [2021-05-02 18:52:44,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:44,789 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-05-02 18:52:44,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:44,789 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-05-02 18:52:44,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:52:44,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:44,790 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:44,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:44,997 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:44,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:44,997 INFO L82 PathProgramCache]: Analyzing trace with hash -131867578, now seen corresponding path program 1 times [2021-05-02 18:52:44,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:44,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323918237] [2021-05-02 18:52:44,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:45,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:45,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:45,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,068 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 18:52:45,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:45,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323918237] [2021-05-02 18:52:45,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323918237] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:45,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:45,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:52:45,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929784333] [2021-05-02 18:52:45,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:52:45,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:45,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:52:45,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:45,070 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:45,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:45,141 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2021-05-02 18:52:45,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:52:45,142 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2021-05-02 18:52:45,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:45,147 INFO L225 Difference]: With dead ends: 84 [2021-05-02 18:52:45,147 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 18:52:45,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:45,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 18:52:45,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 73. [2021-05-02 18:52:45,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 62 states have (on average 1.3387096774193548) internal successors, (83), 63 states have internal predecessors, (83), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:52:45,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2021-05-02 18:52:45,164 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 27 [2021-05-02 18:52:45,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:45,164 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2021-05-02 18:52:45,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:45,165 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2021-05-02 18:52:45,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 18:52:45,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:45,167 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:45,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 18:52:45,168 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:45,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:45,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1679180089, now seen corresponding path program 1 times [2021-05-02 18:52:45,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:45,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74612819] [2021-05-02 18:52:45,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:45,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:45,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:45,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,238 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:52:45,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:45,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74612819] [2021-05-02 18:52:45,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74612819] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:45,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:45,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:52:45,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769131333] [2021-05-02 18:52:45,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:52:45,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:45,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:52:45,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:45,249 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:45,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:45,315 INFO L93 Difference]: Finished difference Result 84 states and 108 transitions. [2021-05-02 18:52:45,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:52:45,315 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2021-05-02 18:52:45,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:45,316 INFO L225 Difference]: With dead ends: 84 [2021-05-02 18:52:45,316 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 18:52:45,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:45,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 18:52:45,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 77. [2021-05-02 18:52:45,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 66 states have (on average 1.3181818181818181) internal successors, (87), 67 states have internal predecessors, (87), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:52:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 98 transitions. [2021-05-02 18:52:45,330 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 98 transitions. Word has length 28 [2021-05-02 18:52:45,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:45,330 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 98 transitions. [2021-05-02 18:52:45,330 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:45,330 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 98 transitions. [2021-05-02 18:52:45,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 18:52:45,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:45,331 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:45,331 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 18:52:45,331 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:45,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:45,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1708732761, now seen corresponding path program 1 times [2021-05-02 18:52:45,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:45,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540350195] [2021-05-02 18:52:45,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:45,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:45,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,430 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:45,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:45,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540350195] [2021-05-02 18:52:45,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540350195] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:45,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867018888] [2021-05-02 18:52:45,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:45,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:52:45,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:45,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:45,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:45,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:45,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:45,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:45,594 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:45,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867018888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:45,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:45,595 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-02 18:52:45,595 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216388891] [2021-05-02 18:52:45,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:52:45,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:45,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:52:45,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:52:45,597 INFO L87 Difference]: Start difference. First operand 77 states and 98 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:45,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:45,736 INFO L93 Difference]: Finished difference Result 103 states and 134 transitions. [2021-05-02 18:52:45,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:52:45,741 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 18:52:45,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:45,741 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:52:45,741 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 18:52:45,742 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 94.3ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:52:45,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 18:52:45,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 92. [2021-05-02 18:52:45,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 81 states have (on average 1.3209876543209877) internal successors, (107), 82 states have internal predecessors, (107), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:52:45,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 118 transitions. [2021-05-02 18:52:45,750 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 118 transitions. Word has length 28 [2021-05-02 18:52:45,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:45,751 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 118 transitions. [2021-05-02 18:52:45,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:45,751 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 118 transitions. [2021-05-02 18:52:45,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:52:45,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:45,753 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:45,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:45,969 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:45,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:45,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1076023237, now seen corresponding path program 2 times [2021-05-02 18:52:45,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:45,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158112987] [2021-05-02 18:52:45,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:45,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:46,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:46,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:46,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:46,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:46,061 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:46,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:46,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158112987] [2021-05-02 18:52:46,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158112987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:46,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922310508] [2021-05-02 18:52:46,062 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:46,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:46,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:46,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:52:46,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:46,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,212 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:52:46,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922310508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:46,212 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:46,212 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2021-05-02 18:52:46,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948616699] [2021-05-02 18:52:46,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:52:46,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:46,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:52:46,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:52:46,213 INFO L87 Difference]: Start difference. First operand 92 states and 118 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:52:46,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:46,846 INFO L93 Difference]: Finished difference Result 208 states and 259 transitions. [2021-05-02 18:52:46,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:52:46,847 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-05-02 18:52:46,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:46,849 INFO L225 Difference]: With dead ends: 208 [2021-05-02 18:52:46,849 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 18:52:46,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 443.3ms TimeCoverageRelationStatistics Valid=320, Invalid=940, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:52:46,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 18:52:46,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 162. [2021-05-02 18:52:46,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 148 states have (on average 1.2972972972972974) internal successors, (192), 149 states have internal predecessors, (192), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:46,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 207 transitions. [2021-05-02 18:52:46,860 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 207 transitions. Word has length 31 [2021-05-02 18:52:46,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:46,861 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 207 transitions. [2021-05-02 18:52:46,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:52:46,862 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 207 transitions. [2021-05-02 18:52:46,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 18:52:46,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:46,866 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:47,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:47,077 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:47,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:47,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1589140216, now seen corresponding path program 1 times [2021-05-02 18:52:47,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:47,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571751678] [2021-05-02 18:52:47,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:47,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:47,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:47,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,210 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:47,210 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:47,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571751678] [2021-05-02 18:52:47,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571751678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350102587] [2021-05-02 18:52:47,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:47,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:52:47,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:47,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:47,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350102587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:47,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2021-05-02 18:52:47,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292767627] [2021-05-02 18:52:47,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:52:47,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:47,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:52:47,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:52:47,424 INFO L87 Difference]: Start difference. First operand 162 states and 207 transitions. Second operand has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:47,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:47,555 INFO L93 Difference]: Finished difference Result 197 states and 249 transitions. [2021-05-02 18:52:47,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:52:47,557 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-05-02 18:52:47,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:47,558 INFO L225 Difference]: With dead ends: 197 [2021-05-02 18:52:47,558 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 18:52:47,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 129.9ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:52:47,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 18:52:47,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 180. [2021-05-02 18:52:47,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 166 states have (on average 1.2771084337349397) internal successors, (212), 167 states have internal predecessors, (212), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:47,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 227 transitions. [2021-05-02 18:52:47,565 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 227 transitions. Word has length 34 [2021-05-02 18:52:47,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:47,565 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 227 transitions. [2021-05-02 18:52:47,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:47,565 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 227 transitions. [2021-05-02 18:52:47,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:52:47,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:47,566 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:47,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 18:52:47,769 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:47,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:47,769 INFO L82 PathProgramCache]: Analyzing trace with hash 210118746, now seen corresponding path program 2 times [2021-05-02 18:52:47,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:47,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622760439] [2021-05-02 18:52:47,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:47,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:47,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:47,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,863 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:47,863 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:47,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622760439] [2021-05-02 18:52:47,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622760439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428838017] [2021-05-02 18:52:47,863 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:47,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:47,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:47,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:52:47,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:47,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,106 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:48,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428838017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:48,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2021-05-02 18:52:48,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790678225] [2021-05-02 18:52:48,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:52:48,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:48,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:52:48,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:52:48,107 INFO L87 Difference]: Start difference. First operand 180 states and 227 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:48,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:48,310 INFO L93 Difference]: Finished difference Result 222 states and 279 transitions. [2021-05-02 18:52:48,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:52:48,310 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-02 18:52:48,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:48,311 INFO L225 Difference]: With dead ends: 222 [2021-05-02 18:52:48,311 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 18:52:48,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 151.3ms TimeCoverageRelationStatistics Valid=96, Invalid=176, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:52:48,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 18:52:48,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 201. [2021-05-02 18:52:48,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 187 states have (on average 1.2727272727272727) internal successors, (238), 188 states have internal predecessors, (238), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:48,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 253 transitions. [2021-05-02 18:52:48,317 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 253 transitions. Word has length 37 [2021-05-02 18:52:48,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:48,317 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 253 transitions. [2021-05-02 18:52:48,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:48,318 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 253 transitions. [2021-05-02 18:52:48,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 18:52:48,318 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:48,318 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:48,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:48,540 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:48,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:48,541 INFO L82 PathProgramCache]: Analyzing trace with hash -856307784, now seen corresponding path program 3 times [2021-05-02 18:52:48,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:48,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336206138] [2021-05-02 18:52:48,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:48,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:48,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:48,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,643 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:48,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:48,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336206138] [2021-05-02 18:52:48,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336206138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20110188] [2021-05-02 18:52:48,643 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:48,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:52:48,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:48,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:52:48,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:48,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,807 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:52:48,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20110188] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:48,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:52:48,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 15 [2021-05-02 18:52:48,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670394492] [2021-05-02 18:52:48,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:52:48,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:48,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:52:48,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:52:48,809 INFO L87 Difference]: Start difference. First operand 201 states and 253 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:48,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:48,851 INFO L93 Difference]: Finished difference Result 196 states and 243 transitions. [2021-05-02 18:52:48,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:52:48,852 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 40 [2021-05-02 18:52:48,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:48,857 INFO L225 Difference]: With dead ends: 196 [2021-05-02 18:52:48,857 INFO L226 Difference]: Without dead ends: 196 [2021-05-02 18:52:48,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 117.5ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:52:48,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-02 18:52:48,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2021-05-02 18:52:48,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 181 states have (on average 1.2541436464088398) internal successors, (227), 182 states have internal predecessors, (227), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:48,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 242 transitions. [2021-05-02 18:52:48,863 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 242 transitions. Word has length 40 [2021-05-02 18:52:48,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:48,863 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 242 transitions. [2021-05-02 18:52:48,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:48,863 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 242 transitions. [2021-05-02 18:52:48,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 18:52:48,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:48,865 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:49,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:49,088 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:49,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:49,089 INFO L82 PathProgramCache]: Analyzing trace with hash -825287977, now seen corresponding path program 1 times [2021-05-02 18:52:49,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:49,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64849120] [2021-05-02 18:52:49,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:49,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:49,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:49,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,209 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:49,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:49,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64849120] [2021-05-02 18:52:49,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64849120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:49,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859532124] [2021-05-02 18:52:49,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:49,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:52:49,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:49,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,430 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:49,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859532124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:49,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:49,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 18 [2021-05-02 18:52:49,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042101914] [2021-05-02 18:52:49,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:52:49,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:49,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:52:49,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:52:49,431 INFO L87 Difference]: Start difference. First operand 195 states and 242 transitions. Second operand has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:49,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:49,641 INFO L93 Difference]: Finished difference Result 237 states and 294 transitions. [2021-05-02 18:52:49,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:52:49,642 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 40 [2021-05-02 18:52:49,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:49,643 INFO L225 Difference]: With dead ends: 237 [2021-05-02 18:52:49,643 INFO L226 Difference]: Without dead ends: 237 [2021-05-02 18:52:49,643 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 187.2ms TimeCoverageRelationStatistics Valid=121, Invalid=221, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:52:49,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-02 18:52:49,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 216. [2021-05-02 18:52:49,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 202 states have (on average 1.2524752475247525) internal successors, (253), 203 states have internal predecessors, (253), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:49,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 268 transitions. [2021-05-02 18:52:49,648 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 268 transitions. Word has length 40 [2021-05-02 18:52:49,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:49,649 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 268 transitions. [2021-05-02 18:52:49,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:49,649 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 268 transitions. [2021-05-02 18:52:49,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:52:49,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:49,649 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:49,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:52:49,865 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:49,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:49,865 INFO L82 PathProgramCache]: Analyzing trace with hash -202872805, now seen corresponding path program 2 times [2021-05-02 18:52:49,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:49,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67903595] [2021-05-02 18:52:49,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:49,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:49,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:49,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,992 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:49,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:49,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67903595] [2021-05-02 18:52:49,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67903595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:49,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877058008] [2021-05-02 18:52:49,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:50,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:50,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:50,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:52:50,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:50,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:50,265 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:50,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877058008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:50,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:50,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-05-02 18:52:50,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604287772] [2021-05-02 18:52:50,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:52:50,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:50,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:52:50,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:52:50,267 INFO L87 Difference]: Start difference. First operand 216 states and 268 transitions. Second operand has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:50,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:50,494 INFO L93 Difference]: Finished difference Result 258 states and 320 transitions. [2021-05-02 18:52:50,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:52:50,497 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-02 18:52:50,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:50,498 INFO L225 Difference]: With dead ends: 258 [2021-05-02 18:52:50,498 INFO L226 Difference]: Without dead ends: 258 [2021-05-02 18:52:50,498 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 202.9ms TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:52:50,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-05-02 18:52:50,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 237. [2021-05-02 18:52:50,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 223 states have (on average 1.251121076233184) internal successors, (279), 224 states have internal predecessors, (279), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 18:52:50,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 294 transitions. [2021-05-02 18:52:50,504 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 294 transitions. Word has length 43 [2021-05-02 18:52:50,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:50,504 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 294 transitions. [2021-05-02 18:52:50,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:50,505 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 294 transitions. [2021-05-02 18:52:50,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 18:52:50,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:50,505 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:50,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:52:50,721 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:50,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:50,721 INFO L82 PathProgramCache]: Analyzing trace with hash 793699415, now seen corresponding path program 3 times [2021-05-02 18:52:50,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:50,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285015092] [2021-05-02 18:52:50,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:50,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:50,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:50,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:50,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:50,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:50,870 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:50,870 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:50,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285015092] [2021-05-02 18:52:50,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285015092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:50,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442857249] [2021-05-02 18:52:50,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:50,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:52:50,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:50,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:52:50,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:51,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,175 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 18:52:51,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442857249] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:51,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:52:51,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [13] total 20 [2021-05-02 18:52:51,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659503832] [2021-05-02 18:52:51,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:52:51,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:51,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:52:51,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:52:51,177 INFO L87 Difference]: Start difference. First operand 237 states and 294 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:51,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:51,250 INFO L93 Difference]: Finished difference Result 318 states and 389 transitions. [2021-05-02 18:52:51,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:52:51,251 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 46 [2021-05-02 18:52:51,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:51,252 INFO L225 Difference]: With dead ends: 318 [2021-05-02 18:52:51,252 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 18:52:51,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 192.1ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:52:51,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 18:52:51,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 314. [2021-05-02 18:52:51,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 293 states have (on average 1.235494880546075) internal successors, (362), 297 states have internal predecessors, (362), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (11), 7 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 18:52:51,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 385 transitions. [2021-05-02 18:52:51,260 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 385 transitions. Word has length 46 [2021-05-02 18:52:51,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:51,260 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 385 transitions. [2021-05-02 18:52:51,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:51,260 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 385 transitions. [2021-05-02 18:52:51,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 18:52:51,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:51,261 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:51,476 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 18:52:51,477 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:51,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:51,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1458701912, now seen corresponding path program 1 times [2021-05-02 18:52:51,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:51,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088877372] [2021-05-02 18:52:51,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:51,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:51,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:51,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:51,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:51,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088877372] [2021-05-02 18:52:51,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088877372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:51,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009877032] [2021-05-02 18:52:51,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:51,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:52:51,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:51,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,896 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:51,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009877032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:51,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:51,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-05-02 18:52:51,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332224942] [2021-05-02 18:52:51,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:52:51,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:51,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:52:51,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=345, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:52:51,899 INFO L87 Difference]: Start difference. First operand 314 states and 385 transitions. Second operand has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:52,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:52,483 INFO L93 Difference]: Finished difference Result 470 states and 576 transitions. [2021-05-02 18:52:52,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:52:52,484 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 18:52:52,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:52,487 INFO L225 Difference]: With dead ends: 470 [2021-05-02 18:52:52,487 INFO L226 Difference]: Without dead ends: 470 [2021-05-02 18:52:52,488 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 472.8ms TimeCoverageRelationStatistics Valid=431, Invalid=1209, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:52:52,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-05-02 18:52:52,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 427. [2021-05-02 18:52:52,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 401 states have (on average 1.2394014962593516) internal successors, (497), 406 states have internal predecessors, (497), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:52:52,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 526 transitions. [2021-05-02 18:52:52,499 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 526 transitions. Word has length 46 [2021-05-02 18:52:52,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:52,499 INFO L480 AbstractCegarLoop]: Abstraction has 427 states and 526 transitions. [2021-05-02 18:52:52,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:52,500 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 526 transitions. [2021-05-02 18:52:52,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:52:52,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:52,500 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:52,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:52:52,705 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:52,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:52,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1517654139, now seen corresponding path program 2 times [2021-05-02 18:52:52,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:52,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806327359] [2021-05-02 18:52:52,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:52,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:52,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:52,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:52,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:52,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:52,861 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:52,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:52,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806327359] [2021-05-02 18:52:52,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806327359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:52,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456258132] [2021-05-02 18:52:52,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:52,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:52,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:52,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:52:52,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:52,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:52,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:52,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:52,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,185 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:53,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456258132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:53,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:53,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2021-05-02 18:52:53,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568279386] [2021-05-02 18:52:53,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:52:53,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:53,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:52:53,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=463, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:52:53,187 INFO L87 Difference]: Start difference. First operand 427 states and 526 transitions. Second operand has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:53,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:53,601 INFO L93 Difference]: Finished difference Result 626 states and 774 transitions. [2021-05-02 18:52:53,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:52:53,602 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2021-05-02 18:52:53,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:53,604 INFO L225 Difference]: With dead ends: 626 [2021-05-02 18:52:53,604 INFO L226 Difference]: Without dead ends: 626 [2021-05-02 18:52:53,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 408.0ms TimeCoverageRelationStatistics Valid=376, Invalid=1030, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:52:53,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-05-02 18:52:53,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 433. [2021-05-02 18:52:53,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 407 states have (on average 1.2506142506142506) internal successors, (509), 412 states have internal predecessors, (509), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:52:53,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 538 transitions. [2021-05-02 18:52:53,616 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 538 transitions. Word has length 49 [2021-05-02 18:52:53,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:53,617 INFO L480 AbstractCegarLoop]: Abstraction has 433 states and 538 transitions. [2021-05-02 18:52:53,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:52:53,617 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 538 transitions. [2021-05-02 18:52:53,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:52:53,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:53,617 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:53,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:53,833 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:53,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:53,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1433960443, now seen corresponding path program 1 times [2021-05-02 18:52:53,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:53,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151639288] [2021-05-02 18:52:53,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:53,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:53,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:53,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:53,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:53,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:53,914 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-05-02 18:52:53,914 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:53,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151639288] [2021-05-02 18:52:53,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151639288] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:53,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:53,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:52:53,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100143314] [2021-05-02 18:52:53,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:52:53,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:53,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:52:53,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:52:53,916 INFO L87 Difference]: Start difference. First operand 433 states and 538 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:54,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:54,047 INFO L93 Difference]: Finished difference Result 569 states and 710 transitions. [2021-05-02 18:52:54,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:52:54,048 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-02 18:52:54,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:54,050 INFO L225 Difference]: With dead ends: 569 [2021-05-02 18:52:54,050 INFO L226 Difference]: Without dead ends: 569 [2021-05-02 18:52:54,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 57.7ms TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:52:54,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-02 18:52:54,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 514. [2021-05-02 18:52:54,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 486 states have (on average 1.2592592592592593) internal successors, (612), 491 states have internal predecessors, (612), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 11 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 18:52:54,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 645 transitions. [2021-05-02 18:52:54,061 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 645 transitions. Word has length 49 [2021-05-02 18:52:54,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:54,061 INFO L480 AbstractCegarLoop]: Abstraction has 514 states and 645 transitions. [2021-05-02 18:52:54,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:54,061 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 645 transitions. [2021-05-02 18:52:54,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 18:52:54,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:54,062 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:54,062 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 18:52:54,062 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:54,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:54,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1121824632, now seen corresponding path program 3 times [2021-05-02 18:52:54,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:54,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872552178] [2021-05-02 18:52:54,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:54,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:54,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,213 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:54,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:54,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872552178] [2021-05-02 18:52:54,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872552178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:54,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963793526] [2021-05-02 18:52:54,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:54,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:52:54,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:54,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:52:54,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:54,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,486 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-05-02 18:52:54,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963793526] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:54,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:52:54,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [16] total 23 [2021-05-02 18:52:54,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60056141] [2021-05-02 18:52:54,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:52:54,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:54,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:52:54,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:52:54,487 INFO L87 Difference]: Start difference. First operand 514 states and 645 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:54,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:54,609 INFO L93 Difference]: Finished difference Result 523 states and 654 transitions. [2021-05-02 18:52:54,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:52:54,610 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 52 [2021-05-02 18:52:54,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:54,611 INFO L225 Difference]: With dead ends: 523 [2021-05-02 18:52:54,612 INFO L226 Difference]: Without dead ends: 523 [2021-05-02 18:52:54,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 244.3ms TimeCoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:52:54,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-02 18:52:54,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 522. [2021-05-02 18:52:54,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 492 states have (on average 1.2560975609756098) internal successors, (618), 498 states have internal predecessors, (618), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 18:52:54,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 653 transitions. [2021-05-02 18:52:54,621 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 653 transitions. Word has length 52 [2021-05-02 18:52:54,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:54,622 INFO L480 AbstractCegarLoop]: Abstraction has 522 states and 653 transitions. [2021-05-02 18:52:54,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 18:52:54,622 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 653 transitions. [2021-05-02 18:52:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 18:52:54,623 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:54,623 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:54,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 18:52:54,837 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:54,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:54,837 INFO L82 PathProgramCache]: Analyzing trace with hash 225679135, now seen corresponding path program 1 times [2021-05-02 18:52:54,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:54,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633058033] [2021-05-02 18:52:54,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:54,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:54,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:54,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-02 18:52:54,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,979 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 265 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-05-02 18:52:54,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:54,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633058033] [2021-05-02 18:52:54,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633058033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:54,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134716498] [2021-05-02 18:52:54,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:55,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:55,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:52:55,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:55,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:55,318 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-05-02 18:52:55,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134716498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:55,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:55,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-05-02 18:52:55,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300228223] [2021-05-02 18:52:55,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:52:55,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:55,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:52:55,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:52:55,319 INFO L87 Difference]: Start difference. First operand 522 states and 653 transitions. Second operand has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:55,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:55,588 INFO L93 Difference]: Finished difference Result 590 states and 733 transitions. [2021-05-02 18:52:55,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:52:55,589 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 87 [2021-05-02 18:52:55,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:55,590 INFO L225 Difference]: With dead ends: 590 [2021-05-02 18:52:55,591 INFO L226 Difference]: Without dead ends: 590 [2021-05-02 18:52:55,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 235.8ms TimeCoverageRelationStatistics Valid=214, Invalid=386, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:52:55,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-02 18:52:55,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 553. [2021-05-02 18:52:55,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 523 states have (on average 1.2447418738049714) internal successors, (651), 529 states have internal predecessors, (651), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 18:52:55,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 686 transitions. [2021-05-02 18:52:55,601 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 686 transitions. Word has length 87 [2021-05-02 18:52:55,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:55,601 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 686 transitions. [2021-05-02 18:52:55,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:55,602 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 686 transitions. [2021-05-02 18:52:55,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:52:55,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:55,603 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:55,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:55,817 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1359158039, now seen corresponding path program 2 times [2021-05-02 18:52:55,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:55,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944360620] [2021-05-02 18:52:55,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:55,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:55,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:55,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:55,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:55,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:55,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 18:52:55,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:55,974 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 324 proven. 145 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-05-02 18:52:55,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:55,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944360620] [2021-05-02 18:52:55,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944360620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:55,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63225211] [2021-05-02 18:52:55,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:56,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:56,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:56,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:52:56,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:56,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,323 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 322 proven. 145 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2021-05-02 18:52:56,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63225211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:56,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:56,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2021-05-02 18:52:56,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752629677] [2021-05-02 18:52:56,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:52:56,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:56,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:52:56,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=403, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:52:56,325 INFO L87 Difference]: Start difference. First operand 553 states and 686 transitions. Second operand has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:56,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:56,602 INFO L93 Difference]: Finished difference Result 648 states and 801 transitions. [2021-05-02 18:52:56,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:52:56,603 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 93 [2021-05-02 18:52:56,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:56,605 INFO L225 Difference]: With dead ends: 648 [2021-05-02 18:52:56,605 INFO L226 Difference]: Without dead ends: 648 [2021-05-02 18:52:56,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 268.9ms TimeCoverageRelationStatistics Valid=251, Invalid=451, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:52:56,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-02 18:52:56,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 600. [2021-05-02 18:52:56,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 570 states have (on average 1.2421052631578948) internal successors, (708), 576 states have internal predecessors, (708), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 18:52:56,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 743 transitions. [2021-05-02 18:52:56,617 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 743 transitions. Word has length 93 [2021-05-02 18:52:56,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:56,617 INFO L480 AbstractCegarLoop]: Abstraction has 600 states and 743 transitions. [2021-05-02 18:52:56,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:56,617 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 743 transitions. [2021-05-02 18:52:56,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:52:56,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:56,618 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:56,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 18:52:56,833 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:56,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:56,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1567764767, now seen corresponding path program 3 times [2021-05-02 18:52:56,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:56,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652331998] [2021-05-02 18:52:56,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:56,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:56,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:56,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-02 18:52:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,996 INFO L134 CoverageAnalysis]: Checked inductivity of 746 backedges. 389 proven. 176 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 18:52:56,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:56,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652331998] [2021-05-02 18:52:56,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652331998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:56,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48656596] [2021-05-02 18:52:56,997 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:57,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:52:57,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:57,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:52:57,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:57,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:57,364 INFO L134 CoverageAnalysis]: Checked inductivity of 746 backedges. 33 proven. 392 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2021-05-02 18:52:57,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48656596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:57,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:57,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 24 [2021-05-02 18:52:57,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36792687] [2021-05-02 18:52:57,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:52:57,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:57,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:52:57,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:52:57,366 INFO L87 Difference]: Start difference. First operand 600 states and 743 transitions. Second operand has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:52:58,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:58,806 INFO L93 Difference]: Finished difference Result 1039 states and 1281 transitions. [2021-05-02 18:52:58,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:52:58,807 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 99 [2021-05-02 18:52:58,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:58,810 INFO L225 Difference]: With dead ends: 1039 [2021-05-02 18:52:58,811 INFO L226 Difference]: Without dead ends: 1039 [2021-05-02 18:52:58,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1166 ImplicationChecksByTransitivity, 1166.5ms TimeCoverageRelationStatistics Valid=944, Invalid=3612, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:52:58,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1039 states. [2021-05-02 18:52:58,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1039 to 972. [2021-05-02 18:52:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 972 states, 931 states have (on average 1.2406015037593985) internal successors, (1155), 939 states have internal predecessors, (1155), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 18:52:58,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 972 states to 972 states and 1204 transitions. [2021-05-02 18:52:58,829 INFO L78 Accepts]: Start accepts. Automaton has 972 states and 1204 transitions. Word has length 99 [2021-05-02 18:52:58,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:58,830 INFO L480 AbstractCegarLoop]: Abstraction has 972 states and 1204 transitions. [2021-05-02 18:52:58,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:52:58,830 INFO L276 IsEmpty]: Start isEmpty. Operand 972 states and 1204 transitions. [2021-05-02 18:52:58,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:52:58,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:58,831 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:59,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:59,045 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:59,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:59,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1915685814, now seen corresponding path program 1 times [2021-05-02 18:52:59,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:59,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868904964] [2021-05-02 18:52:59,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:59,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:59,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:59,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:59,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:52:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:59,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-02 18:52:59,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:59,225 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 44 proven. 630 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-05-02 18:52:59,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:59,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868904964] [2021-05-02 18:52:59,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868904964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:59,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872803129] [2021-05-02 18:52:59,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:59,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:59,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:52:59,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:59,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:59,650 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 458 proven. 210 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-02 18:52:59,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872803129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:59,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:59,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 30 [2021-05-02 18:52:59,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848705303] [2021-05-02 18:52:59,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:52:59,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:59,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:52:59,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=540, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:52:59,652 INFO L87 Difference]: Start difference. First operand 972 states and 1204 transitions. Second operand has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:59,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:59,942 INFO L93 Difference]: Finished difference Result 1093 states and 1350 transitions. [2021-05-02 18:52:59,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:52:59,943 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 105 [2021-05-02 18:52:59,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:59,946 INFO L225 Difference]: With dead ends: 1093 [2021-05-02 18:52:59,947 INFO L226 Difference]: Without dead ends: 1093 [2021-05-02 18:52:59,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 331.9ms TimeCoverageRelationStatistics Valid=334, Invalid=596, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:52:59,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1093 states. [2021-05-02 18:52:59,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1093 to 1023. [2021-05-02 18:52:59,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1023 states, 982 states have (on average 1.2382892057026476) internal successors, (1216), 990 states have internal predecessors, (1216), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 18:52:59,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1023 states to 1023 states and 1265 transitions. [2021-05-02 18:52:59,968 INFO L78 Accepts]: Start accepts. Automaton has 1023 states and 1265 transitions. Word has length 105 [2021-05-02 18:52:59,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:59,968 INFO L480 AbstractCegarLoop]: Abstraction has 1023 states and 1265 transitions. [2021-05-02 18:52:59,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:52:59,968 INFO L276 IsEmpty]: Start isEmpty. Operand 1023 states and 1265 transitions. [2021-05-02 18:52:59,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 18:52:59,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:59,970 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 13, 13, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:00,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:53:00,192 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:00,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:00,192 INFO L82 PathProgramCache]: Analyzing trace with hash 668267967, now seen corresponding path program 2 times [2021-05-02 18:53:00,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:00,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149815450] [2021-05-02 18:53:00,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:00,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:00,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:00,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-02 18:53:00,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 47 proven. 741 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2021-05-02 18:53:00,404 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:00,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149815450] [2021-05-02 18:53:00,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149815450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:00,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836556794] [2021-05-02 18:53:00,404 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:00,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:00,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:00,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:53:00,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:00,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 535 proven. 247 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2021-05-02 18:53:00,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836556794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:00,863 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:00,863 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 32 [2021-05-02 18:53:00,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097725094] [2021-05-02 18:53:00,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:53:00,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:00,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:53:00,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=616, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:53:00,865 INFO L87 Difference]: Start difference. First operand 1023 states and 1265 transitions. Second operand has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:01,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:01,153 INFO L93 Difference]: Finished difference Result 1172 states and 1444 transitions. [2021-05-02 18:53:01,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:53:01,154 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 111 [2021-05-02 18:53:01,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:01,157 INFO L225 Difference]: With dead ends: 1172 [2021-05-02 18:53:01,158 INFO L226 Difference]: Without dead ends: 1172 [2021-05-02 18:53:01,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 373.2ms TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:53:01,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1172 states. [2021-05-02 18:53:01,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1172 to 1098. [2021-05-02 18:53:01,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1098 states, 1057 states have (on average 1.2355723746452223) internal successors, (1306), 1065 states have internal predecessors, (1306), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 18:53:01,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1098 states to 1098 states and 1355 transitions. [2021-05-02 18:53:01,176 INFO L78 Accepts]: Start accepts. Automaton has 1098 states and 1355 transitions. Word has length 111 [2021-05-02 18:53:01,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:01,176 INFO L480 AbstractCegarLoop]: Abstraction has 1098 states and 1355 transitions. [2021-05-02 18:53:01,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:01,176 INFO L276 IsEmpty]: Start isEmpty. Operand 1098 states and 1355 transitions. [2021-05-02 18:53:01,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:53:01,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:01,178 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 14, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:01,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:53:01,403 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:01,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:01,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1949635370, now seen corresponding path program 3 times [2021-05-02 18:53:01,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:01,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109222192] [2021-05-02 18:53:01,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:01,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:01,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:01,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-02 18:53:01,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1199 backedges. 50 proven. 861 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-05-02 18:53:01,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:01,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109222192] [2021-05-02 18:53:01,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109222192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:01,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073048182] [2021-05-02 18:53:01,635 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:01,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:53:01,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:01,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:53:01,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:01,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:01,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:01,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:01,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:02,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:02,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1199 backedges. 42 proven. 623 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-05-02 18:53:02,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073048182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:02,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:02,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2021-05-02 18:53:02,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355451883] [2021-05-02 18:53:02,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:53:02,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:02,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:53:02,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:53:02,041 INFO L87 Difference]: Start difference. First operand 1098 states and 1355 transitions. Second operand has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 18:53:03,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:03,739 INFO L93 Difference]: Finished difference Result 1403 states and 1712 transitions. [2021-05-02 18:53:03,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 18:53:03,739 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 117 [2021-05-02 18:53:03,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:03,743 INFO L225 Difference]: With dead ends: 1403 [2021-05-02 18:53:03,743 INFO L226 Difference]: Without dead ends: 1403 [2021-05-02 18:53:03,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1726 ImplicationChecksByTransitivity, 1458.9ms TimeCoverageRelationStatistics Valid=1364, Invalid=4956, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 18:53:03,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1403 states. [2021-05-02 18:53:03,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1403 to 1271. [2021-05-02 18:53:03,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1271 states, 1225 states have (on average 1.2318367346938774) internal successors, (1509), 1235 states have internal predecessors, (1509), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 18:53:03,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1564 transitions. [2021-05-02 18:53:03,762 INFO L78 Accepts]: Start accepts. Automaton has 1271 states and 1564 transitions. Word has length 117 [2021-05-02 18:53:03,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:03,762 INFO L480 AbstractCegarLoop]: Abstraction has 1271 states and 1564 transitions. [2021-05-02 18:53:03,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 18:53:03,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1271 states and 1564 transitions. [2021-05-02 18:53:03,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 18:53:03,764 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:03,764 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 28, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:03,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:53:03,985 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:03,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:03,985 INFO L82 PathProgramCache]: Analyzing trace with hash -181278978, now seen corresponding path program 4 times [2021-05-02 18:53:03,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:03,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062067132] [2021-05-02 18:53:03,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:03,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:04,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:04,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:04,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:04,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:04,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-02 18:53:04,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:04,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 709 proven. 330 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2021-05-02 18:53:04,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:04,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062067132] [2021-05-02 18:53:04,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062067132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:04,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189529617] [2021-05-02 18:53:04,204 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:04,293 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:04,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:04,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:53:04,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:04,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:05,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 287 proven. 1087 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:05,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189529617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:05,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:05,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 41] total 59 [2021-05-02 18:53:05,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755842511] [2021-05-02 18:53:05,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:53:05,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:05,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:53:05,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=2905, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:53:05,691 INFO L87 Difference]: Start difference. First operand 1271 states and 1564 transitions. Second operand has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:07,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:07,659 INFO L93 Difference]: Finished difference Result 1469 states and 1794 transitions. [2021-05-02 18:53:07,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:53:07,669 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 123 [2021-05-02 18:53:07,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:07,673 INFO L225 Difference]: With dead ends: 1469 [2021-05-02 18:53:07,673 INFO L226 Difference]: Without dead ends: 1469 [2021-05-02 18:53:07,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3591 ImplicationChecksByTransitivity, 2312.3ms TimeCoverageRelationStatistics Valid=1976, Invalid=9796, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 18:53:07,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2021-05-02 18:53:07,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1343. [2021-05-02 18:53:07,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1343 states, 1297 states have (on average 1.2305319969159598) internal successors, (1596), 1307 states have internal predecessors, (1596), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 18:53:07,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1343 states to 1343 states and 1651 transitions. [2021-05-02 18:53:07,695 INFO L78 Accepts]: Start accepts. Automaton has 1343 states and 1651 transitions. Word has length 123 [2021-05-02 18:53:07,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:07,695 INFO L480 AbstractCegarLoop]: Abstraction has 1343 states and 1651 transitions. [2021-05-02 18:53:07,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:07,696 INFO L276 IsEmpty]: Start isEmpty. Operand 1343 states and 1651 transitions. [2021-05-02 18:53:07,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 18:53:07,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:07,697 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:07,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:53:07,921 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:07,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:07,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1219098231, now seen corresponding path program 1 times [2021-05-02 18:53:07,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:07,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327353192] [2021-05-02 18:53:07,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:07,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:08,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:08,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:08,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:08,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:08,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-02 18:53:08,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:08,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 805 proven. 376 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-05-02 18:53:08,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:08,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327353192] [2021-05-02 18:53:08,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327353192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:08,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308011092] [2021-05-02 18:53:08,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:08,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:08,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:53:08,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:08,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 802 proven. 376 refuted. 0 times theorem prover too weak. 383 trivial. 0 not checked. [2021-05-02 18:53:08,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308011092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:08,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:08,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 39 [2021-05-02 18:53:08,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701096161] [2021-05-02 18:53:08,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:53:08,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:08,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:53:08,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=981, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:53:08,780 INFO L87 Difference]: Start difference. First operand 1343 states and 1651 transitions. Second operand has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:09,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:09,677 INFO L93 Difference]: Finished difference Result 1817 states and 2236 transitions. [2021-05-02 18:53:09,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:53:09,677 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 129 [2021-05-02 18:53:09,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:09,683 INFO L225 Difference]: With dead ends: 1817 [2021-05-02 18:53:09,683 INFO L226 Difference]: Without dead ends: 1817 [2021-05-02 18:53:09,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 977.3ms TimeCoverageRelationStatistics Valid=1159, Invalid=3001, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:53:09,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1817 states. [2021-05-02 18:53:09,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1817 to 1284. [2021-05-02 18:53:09,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1284 states, 1238 states have (on average 1.254442649434572) internal successors, (1553), 1248 states have internal predecessors, (1553), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 18:53:09,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1284 states to 1284 states and 1608 transitions. [2021-05-02 18:53:09,708 INFO L78 Accepts]: Start accepts. Automaton has 1284 states and 1608 transitions. Word has length 129 [2021-05-02 18:53:09,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:09,708 INFO L480 AbstractCegarLoop]: Abstraction has 1284 states and 1608 transitions. [2021-05-02 18:53:09,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:09,709 INFO L276 IsEmpty]: Start isEmpty. Operand 1284 states and 1608 transitions. [2021-05-02 18:53:09,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 18:53:09,710 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:09,711 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:09,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:53:09,925 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:09,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:09,925 INFO L82 PathProgramCache]: Analyzing trace with hash -376627745, now seen corresponding path program 2 times [2021-05-02 18:53:09,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:09,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205825921] [2021-05-02 18:53:09,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:09,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:10,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:10,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 18:53:10,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 906 proven. 425 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2021-05-02 18:53:10,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:10,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205825921] [2021-05-02 18:53:10,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205825921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:10,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707299577] [2021-05-02 18:53:10,202 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:10,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:10,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:10,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:53:10,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:10,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 7 proven. 1293 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2021-05-02 18:53:10,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707299577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:10,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:10,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 42 [2021-05-02 18:53:10,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234473331] [2021-05-02 18:53:10,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:53:10,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:10,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:53:10,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1179, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:53:10,800 INFO L87 Difference]: Start difference. First operand 1284 states and 1608 transitions. Second operand has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:53:11,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:11,497 INFO L93 Difference]: Finished difference Result 1885 states and 2373 transitions. [2021-05-02 18:53:11,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 18:53:11,497 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 135 [2021-05-02 18:53:11,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:11,501 INFO L225 Difference]: With dead ends: 1885 [2021-05-02 18:53:11,501 INFO L226 Difference]: Without dead ends: 1885 [2021-05-02 18:53:11,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1089 ImplicationChecksByTransitivity, 777.5ms TimeCoverageRelationStatistics Valid=1088, Invalid=2694, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:53:11,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1885 states. [2021-05-02 18:53:11,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1885 to 1297. [2021-05-02 18:53:11,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1297 states, 1251 states have (on average 1.2621902478017586) internal successors, (1579), 1261 states have internal predecessors, (1579), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 18:53:11,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 1634 transitions. [2021-05-02 18:53:11,523 INFO L78 Accepts]: Start accepts. Automaton has 1297 states and 1634 transitions. Word has length 135 [2021-05-02 18:53:11,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:11,523 INFO L480 AbstractCegarLoop]: Abstraction has 1297 states and 1634 transitions. [2021-05-02 18:53:11,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:53:11,523 INFO L276 IsEmpty]: Start isEmpty. Operand 1297 states and 1634 transitions. [2021-05-02 18:53:11,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 18:53:11,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:11,525 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 34, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:11,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:11,741 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:11,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:11,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1208899744, now seen corresponding path program 1 times [2021-05-02 18:53:11,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:11,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079392862] [2021-05-02 18:53:11,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:11,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:11,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:11,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:11,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:11,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:11,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 18:53:11,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:11,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 3 proven. 907 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2021-05-02 18:53:11,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:11,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079392862] [2021-05-02 18:53:11,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079392862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:11,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066551112] [2021-05-02 18:53:11,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:11,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:11,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:53:11,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:11,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:11,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 903 proven. 425 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2021-05-02 18:53:12,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066551112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:12,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:12,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 21] total 25 [2021-05-02 18:53:12,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811640865] [2021-05-02 18:53:12,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:53:12,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:12,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:53:12,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=378, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:53:12,390 INFO L87 Difference]: Start difference. First operand 1297 states and 1634 transitions. Second operand has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:53:13,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:13,715 INFO L93 Difference]: Finished difference Result 1827 states and 2269 transitions. [2021-05-02 18:53:13,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-02 18:53:13,716 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 135 [2021-05-02 18:53:13,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:13,720 INFO L225 Difference]: With dead ends: 1827 [2021-05-02 18:53:13,720 INFO L226 Difference]: Without dead ends: 1827 [2021-05-02 18:53:13,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1655 ImplicationChecksByTransitivity, 1340.0ms TimeCoverageRelationStatistics Valid=2083, Invalid=4559, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:53:13,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1827 states. [2021-05-02 18:53:13,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1827 to 1477. [2021-05-02 18:53:13,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1477 states, 1429 states have (on average 1.2596221133659902) internal successors, (1800), 1439 states have internal predecessors, (1800), 30 states have call successors, (30), 18 states have call predecessors, (30), 17 states have return successors, (29), 19 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-02 18:53:13,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1477 states to 1477 states and 1859 transitions. [2021-05-02 18:53:13,741 INFO L78 Accepts]: Start accepts. Automaton has 1477 states and 1859 transitions. Word has length 135 [2021-05-02 18:53:13,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:13,742 INFO L480 AbstractCegarLoop]: Abstraction has 1477 states and 1859 transitions. [2021-05-02 18:53:13,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:53:13,742 INFO L276 IsEmpty]: Start isEmpty. Operand 1477 states and 1859 transitions. [2021-05-02 18:53:13,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 18:53:13,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:13,744 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:13,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:53:13,952 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:13,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:13,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1476745417, now seen corresponding path program 3 times [2021-05-02 18:53:13,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:13,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379728973] [2021-05-02 18:53:13,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:13,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:14,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:14,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:14,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:14,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:14,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2021-05-02 18:53:14,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:14,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1971 backedges. 1013 proven. 477 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2021-05-02 18:53:14,253 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:14,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379728973] [2021-05-02 18:53:14,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379728973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:14,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124052933] [2021-05-02 18:53:14,253 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:14,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:53:14,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:14,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:53:14,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:14,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1971 backedges. 0 proven. 1017 refuted. 0 times theorem prover too weak. 954 trivial. 0 not checked. [2021-05-02 18:53:14,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124052933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:14,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:14,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11] total 33 [2021-05-02 18:53:14,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944604942] [2021-05-02 18:53:14,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:53:14,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:14,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:53:14,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=826, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:53:14,727 INFO L87 Difference]: Start difference. First operand 1477 states and 1859 transitions. Second operand has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 18:53:18,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:18,077 INFO L93 Difference]: Finished difference Result 2220 states and 2795 transitions. [2021-05-02 18:53:18,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-02 18:53:18,077 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 141 [2021-05-02 18:53:18,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:18,082 INFO L225 Difference]: With dead ends: 2220 [2021-05-02 18:53:18,082 INFO L226 Difference]: Without dead ends: 2220 [2021-05-02 18:53:18,083 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5488 ImplicationChecksByTransitivity, 2953.2ms TimeCoverageRelationStatistics Valid=3393, Invalid=14697, Unknown=0, NotChecked=0, Total=18090 [2021-05-02 18:53:18,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2220 states. [2021-05-02 18:53:18,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2220 to 1500. [2021-05-02 18:53:18,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1500 states, 1450 states have (on average 1.2544827586206897) internal successors, (1819), 1461 states have internal predecessors, (1819), 31 states have call successors, (31), 19 states have call predecessors, (31), 18 states have return successors, (30), 19 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 18:53:18,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1500 states to 1500 states and 1880 transitions. [2021-05-02 18:53:18,105 INFO L78 Accepts]: Start accepts. Automaton has 1500 states and 1880 transitions. Word has length 141 [2021-05-02 18:53:18,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:18,105 INFO L480 AbstractCegarLoop]: Abstraction has 1500 states and 1880 transitions. [2021-05-02 18:53:18,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 18:53:18,105 INFO L276 IsEmpty]: Start isEmpty. Operand 1500 states and 1880 transitions. [2021-05-02 18:53:18,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-05-02 18:53:18,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:18,107 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 36, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:18,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:18,321 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:18,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:18,321 INFO L82 PathProgramCache]: Analyzing trace with hash -2074253891, now seen corresponding path program 1 times [2021-05-02 18:53:18,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:18,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663716041] [2021-05-02 18:53:18,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:18,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:18,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:18,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2021-05-02 18:53:18,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,608 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 1067 proven. 477 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-05-02 18:53:18,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:18,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663716041] [2021-05-02 18:53:18,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663716041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:18,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8071730] [2021-05-02 18:53:18,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:18,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:53:18,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:18,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:18,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 1065 proven. 477 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2021-05-02 18:53:19,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8071730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:19,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:19,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 42 [2021-05-02 18:53:19,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781649713] [2021-05-02 18:53:19,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:53:19,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:19,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:53:19,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1071, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:53:19,204 INFO L87 Difference]: Start difference. First operand 1500 states and 1880 transitions. Second operand has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:19,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:19,601 INFO L93 Difference]: Finished difference Result 1614 states and 2015 transitions. [2021-05-02 18:53:19,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:53:19,601 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 144 [2021-05-02 18:53:19,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:19,604 INFO L225 Difference]: With dead ends: 1614 [2021-05-02 18:53:19,605 INFO L226 Difference]: Without dead ends: 1614 [2021-05-02 18:53:19,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 550.0ms TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:53:19,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1614 states. [2021-05-02 18:53:19,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1614 to 1551. [2021-05-02 18:53:19,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1551 states, 1501 states have (on average 1.2478347768154563) internal successors, (1873), 1512 states have internal predecessors, (1873), 31 states have call successors, (31), 19 states have call predecessors, (31), 18 states have return successors, (30), 19 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 18:53:19,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1551 states to 1551 states and 1934 transitions. [2021-05-02 18:53:19,623 INFO L78 Accepts]: Start accepts. Automaton has 1551 states and 1934 transitions. Word has length 144 [2021-05-02 18:53:19,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:19,623 INFO L480 AbstractCegarLoop]: Abstraction has 1551 states and 1934 transitions. [2021-05-02 18:53:19,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:19,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1551 states and 1934 transitions. [2021-05-02 18:53:19,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 18:53:19,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:19,625 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:19,847 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:53:19,848 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:19,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:19,848 INFO L82 PathProgramCache]: Analyzing trace with hash -135518722, now seen corresponding path program 5 times [2021-05-02 18:53:19,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:19,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660354380] [2021-05-02 18:53:19,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:19,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:20,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:20,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:20,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:20,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:20,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2021-05-02 18:53:20,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:20,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2194 backedges. 1125 proven. 532 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-05-02 18:53:20,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:20,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660354380] [2021-05-02 18:53:20,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660354380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:20,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610863656] [2021-05-02 18:53:20,155 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:20,224 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2021-05-02 18:53:20,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:20,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:53:20,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:20,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:20,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2194 backedges. 1212 proven. 2 refuted. 0 times theorem prover too weak. 980 trivial. 0 not checked. [2021-05-02 18:53:20,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610863656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:20,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:20,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6] total 28 [2021-05-02 18:53:20,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179650326] [2021-05-02 18:53:20,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:53:20,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:20,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:53:20,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=510, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:53:20,479 INFO L87 Difference]: Start difference. First operand 1551 states and 1934 transitions. Second operand has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 18:53:23,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:23,006 INFO L93 Difference]: Finished difference Result 1988 states and 2387 transitions. [2021-05-02 18:53:23,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-02 18:53:23,008 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 147 [2021-05-02 18:53:23,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:23,012 INFO L225 Difference]: With dead ends: 1988 [2021-05-02 18:53:23,012 INFO L226 Difference]: Without dead ends: 1980 [2021-05-02 18:53:23,013 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5813 ImplicationChecksByTransitivity, 2194.7ms TimeCoverageRelationStatistics Valid=3678, Invalid=12072, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 18:53:23,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1980 states. [2021-05-02 18:53:23,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1980 to 1545. [2021-05-02 18:53:23,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1545 states, 1497 states have (on average 1.2391449565798263) internal successors, (1855), 1507 states have internal predecessors, (1855), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (28), 18 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 18:53:23,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1545 states to 1545 states and 1912 transitions. [2021-05-02 18:53:23,033 INFO L78 Accepts]: Start accepts. Automaton has 1545 states and 1912 transitions. Word has length 147 [2021-05-02 18:53:23,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:23,033 INFO L480 AbstractCegarLoop]: Abstraction has 1545 states and 1912 transitions. [2021-05-02 18:53:23,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 18:53:23,034 INFO L276 IsEmpty]: Start isEmpty. Operand 1545 states and 1912 transitions. [2021-05-02 18:53:23,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 18:53:23,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:23,036 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 39, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:23,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:53:23,249 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:23,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:23,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1586608682, now seen corresponding path program 2 times [2021-05-02 18:53:23,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:23,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013979448] [2021-05-02 18:53:23,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:23,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:23,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:23,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:23,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:23,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:23,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2021-05-02 18:53:23,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:23,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 1244 proven. 590 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2021-05-02 18:53:23,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:23,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013979448] [2021-05-02 18:53:23,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013979448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:23,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218317190] [2021-05-02 18:53:23,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:23,680 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:23,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:23,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 18:53:23,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:23,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:23,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:24,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 1242 proven. 590 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2021-05-02 18:53:24,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218317190] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:24,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:24,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 46 [2021-05-02 18:53:24,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140461467] [2021-05-02 18:53:24,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:53:24,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:24,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:53:24,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=1288, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:53:24,294 INFO L87 Difference]: Start difference. First operand 1545 states and 1912 transitions. Second operand has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:24,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:24,683 INFO L93 Difference]: Finished difference Result 1769 states and 2173 transitions. [2021-05-02 18:53:24,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:53:24,691 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 153 [2021-05-02 18:53:24,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:24,695 INFO L225 Difference]: With dead ends: 1769 [2021-05-02 18:53:24,695 INFO L226 Difference]: Without dead ends: 1769 [2021-05-02 18:53:24,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 879 ImplicationChecksByTransitivity, 642.4ms TimeCoverageRelationStatistics Valid=786, Invalid=1376, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:53:24,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1769 states. [2021-05-02 18:53:24,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1769 to 1632. [2021-05-02 18:53:24,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1632 states, 1584 states have (on average 1.2367424242424243) internal successors, (1959), 1594 states have internal predecessors, (1959), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (28), 18 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 18:53:24,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1632 states to 1632 states and 2016 transitions. [2021-05-02 18:53:24,714 INFO L78 Accepts]: Start accepts. Automaton has 1632 states and 2016 transitions. Word has length 153 [2021-05-02 18:53:24,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:24,714 INFO L480 AbstractCegarLoop]: Abstraction has 1632 states and 2016 transitions. [2021-05-02 18:53:24,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:24,714 INFO L276 IsEmpty]: Start isEmpty. Operand 1632 states and 2016 transitions. [2021-05-02 18:53:24,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-02 18:53:24,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:24,716 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 41, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:24,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:53:24,941 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:24,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:24,941 INFO L82 PathProgramCache]: Analyzing trace with hash 781378848, now seen corresponding path program 3 times [2021-05-02 18:53:24,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:24,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869775423] [2021-05-02 18:53:24,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:24,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:25,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:25,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:25,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:25,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:25,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-02 18:53:25,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:25,305 INFO L134 CoverageAnalysis]: Checked inductivity of 2676 backedges. 1369 proven. 651 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2021-05-02 18:53:25,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:25,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869775423] [2021-05-02 18:53:25,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869775423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:25,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007869240] [2021-05-02 18:53:25,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:25,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:53:25,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:25,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 18:53:25,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:25,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:25,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:25,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:25,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:25,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2676 backedges. 0 proven. 1374 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2021-05-02 18:53:25,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007869240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:25,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:25,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11] total 35 [2021-05-02 18:53:25,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134266741] [2021-05-02 18:53:25,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:53:25,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:25,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:53:25,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=884, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:53:25,855 INFO L87 Difference]: Start difference. First operand 1632 states and 2016 transitions. Second operand has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:30,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:30,820 INFO L93 Difference]: Finished difference Result 2258 states and 2768 transitions. [2021-05-02 18:53:30,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-05-02 18:53:30,820 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 159 [2021-05-02 18:53:30,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:30,825 INFO L225 Difference]: With dead ends: 2258 [2021-05-02 18:53:30,826 INFO L226 Difference]: Without dead ends: 2258 [2021-05-02 18:53:30,828 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10415 ImplicationChecksByTransitivity, 4472.4ms TimeCoverageRelationStatistics Valid=6186, Invalid=24614, Unknown=0, NotChecked=0, Total=30800 [2021-05-02 18:53:30,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2258 states. [2021-05-02 18:53:30,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2258 to 2007. [2021-05-02 18:53:30,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2007 states, 1951 states have (on average 1.2347514095335725) internal successors, (2409), 1962 states have internal predecessors, (2409), 33 states have call successors, (33), 23 states have call predecessors, (33), 22 states have return successors, (32), 21 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-02 18:53:30,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2007 states to 2007 states and 2474 transitions. [2021-05-02 18:53:30,864 INFO L78 Accepts]: Start accepts. Automaton has 2007 states and 2474 transitions. Word has length 159 [2021-05-02 18:53:30,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:30,864 INFO L480 AbstractCegarLoop]: Abstraction has 2007 states and 2474 transitions. [2021-05-02 18:53:30,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:30,864 INFO L276 IsEmpty]: Start isEmpty. Operand 2007 states and 2474 transitions. [2021-05-02 18:53:30,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-02 18:53:30,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:30,867 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 44, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:31,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:31,081 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:31,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:31,081 INFO L82 PathProgramCache]: Analyzing trace with hash 415481180, now seen corresponding path program 6 times [2021-05-02 18:53:31,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:31,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543389301] [2021-05-02 18:53:31,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:31,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:31,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:31,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:31,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:31,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:31,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2021-05-02 18:53:31,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:31,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 1567 proven. 715 refuted. 0 times theorem prover too weak. 787 trivial. 0 not checked. [2021-05-02 18:53:31,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:31,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543389301] [2021-05-02 18:53:31,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543389301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:31,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311309757] [2021-05-02 18:53:31,486 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:31,548 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 18:53:31,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:31,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:53:31,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:31,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:31,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:31,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:31,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:31,834 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 1615 proven. 67 refuted. 0 times theorem prover too weak. 1387 trivial. 0 not checked. [2021-05-02 18:53:31,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311309757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:31,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:31,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 5] total 30 [2021-05-02 18:53:31,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227469251] [2021-05-02 18:53:31,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:53:31,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:31,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:53:31,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:53:31,835 INFO L87 Difference]: Start difference. First operand 2007 states and 2474 transitions. Second operand has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:34,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:34,464 INFO L93 Difference]: Finished difference Result 1552 states and 1779 transitions. [2021-05-02 18:53:34,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-02 18:53:34,464 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 168 [2021-05-02 18:53:34,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:34,468 INFO L225 Difference]: With dead ends: 1552 [2021-05-02 18:53:34,468 INFO L226 Difference]: Without dead ends: 1552 [2021-05-02 18:53:34,470 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5115 ImplicationChecksByTransitivity, 2239.7ms TimeCoverageRelationStatistics Valid=4539, Invalid=10961, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 18:53:34,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1552 states. [2021-05-02 18:53:34,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1552 to 994. [2021-05-02 18:53:34,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 964 states have (on average 1.1607883817427387) internal successors, (1119), 968 states have internal predecessors, (1119), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:53:34,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1148 transitions. [2021-05-02 18:53:34,484 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1148 transitions. Word has length 168 [2021-05-02 18:53:34,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:34,484 INFO L480 AbstractCegarLoop]: Abstraction has 994 states and 1148 transitions. [2021-05-02 18:53:34,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 18:53:34,484 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1148 transitions. [2021-05-02 18:53:34,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-02 18:53:34,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:34,486 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 66, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:34,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:53:34,705 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:34,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:34,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1606134237, now seen corresponding path program 4 times [2021-05-02 18:53:34,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:34,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392481383] [2021-05-02 18:53:34,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:34,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:35,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:35,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2021-05-02 18:53:35,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 167 [2021-05-02 18:53:35,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,129 INFO L134 CoverageAnalysis]: Checked inductivity of 7274 backedges. 3274 proven. 782 refuted. 0 times theorem prover too weak. 3218 trivial. 0 not checked. [2021-05-02 18:53:35,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:35,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392481383] [2021-05-02 18:53:35,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392481383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:35,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531599367] [2021-05-02 18:53:35,129 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:35,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:35,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:35,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 18:53:35,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:35,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:35,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:37,735 INFO L134 CoverageAnalysis]: Checked inductivity of 7274 backedges. 715 proven. 5773 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2021-05-02 18:53:37,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531599367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:37,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:37,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 58] total 84 [2021-05-02 18:53:37,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343937713] [2021-05-02 18:53:37,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-02 18:53:37,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:37,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-02 18:53:37,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=5920, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:53:37,738 INFO L87 Difference]: Start difference. First operand 994 states and 1148 transitions. Second operand has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 18:53:42,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:42,165 INFO L93 Difference]: Finished difference Result 1467 states and 1692 transitions. [2021-05-02 18:53:42,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-02 18:53:42,166 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 251 [2021-05-02 18:53:42,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:42,169 INFO L225 Difference]: With dead ends: 1467 [2021-05-02 18:53:42,169 INFO L226 Difference]: Without dead ends: 1467 [2021-05-02 18:53:42,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11018 ImplicationChecksByTransitivity, 5114.2ms TimeCoverageRelationStatistics Valid=5123, Invalid=28183, Unknown=0, NotChecked=0, Total=33306 [2021-05-02 18:53:42,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1467 states. [2021-05-02 18:53:42,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1467 to 1039. [2021-05-02 18:53:42,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1039 states, 1009 states have (on average 1.1605550049554014) internal successors, (1171), 1013 states have internal predecessors, (1171), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:53:42,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1200 transitions. [2021-05-02 18:53:42,184 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1200 transitions. Word has length 251 [2021-05-02 18:53:42,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:42,184 INFO L480 AbstractCegarLoop]: Abstraction has 1039 states and 1200 transitions. [2021-05-02 18:53:42,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 18:53:42,185 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1200 transitions. [2021-05-02 18:53:42,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-05-02 18:53:42,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:42,189 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 69, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:42,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:42,405 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:42,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:42,405 INFO L82 PathProgramCache]: Analyzing trace with hash -596428713, now seen corresponding path program 5 times [2021-05-02 18:53:42,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:42,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488748924] [2021-05-02 18:53:42,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:42,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:42,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:42,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:42,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:42,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:42,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 18:53:42,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:42,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173 [2021-05-02 18:53:42,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 7913 backedges. 3560 proven. 852 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2021-05-02 18:53:42,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:42,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488748924] [2021-05-02 18:53:42,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488748924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:42,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706913333] [2021-05-02 18:53:42,828 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:42,943 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 50 check-sat command(s) [2021-05-02 18:53:42,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:42,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 18:53:42,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:42,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:42,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:43,807 INFO L134 CoverageAnalysis]: Checked inductivity of 7913 backedges. 3556 proven. 852 refuted. 0 times theorem prover too weak. 3505 trivial. 0 not checked. [2021-05-02 18:53:43,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706913333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:43,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:43,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 54 [2021-05-02 18:53:43,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778202594] [2021-05-02 18:53:43,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:53:43,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:43,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:53:43,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1080, Invalid=1782, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:53:43,809 INFO L87 Difference]: Start difference. First operand 1039 states and 1200 transitions. Second operand has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:44,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:44,204 INFO L93 Difference]: Finished difference Result 1153 states and 1330 transitions. [2021-05-02 18:53:44,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 18:53:44,204 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 260 [2021-05-02 18:53:44,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:44,207 INFO L225 Difference]: With dead ends: 1153 [2021-05-02 18:53:44,207 INFO L226 Difference]: Without dead ends: 1153 [2021-05-02 18:53:44,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 873.0ms TimeCoverageRelationStatistics Valid=1084, Invalid=1886, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:53:44,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1153 states. [2021-05-02 18:53:44,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1153 to 1084. [2021-05-02 18:53:44,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1084 states, 1054 states have (on average 1.1603415559772297) internal successors, (1223), 1058 states have internal predecessors, (1223), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:53:44,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1084 states to 1084 states and 1252 transitions. [2021-05-02 18:53:44,219 INFO L78 Accepts]: Start accepts. Automaton has 1084 states and 1252 transitions. Word has length 260 [2021-05-02 18:53:44,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:44,219 INFO L480 AbstractCegarLoop]: Abstraction has 1084 states and 1252 transitions. [2021-05-02 18:53:44,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 18:53:44,220 INFO L276 IsEmpty]: Start isEmpty. Operand 1084 states and 1252 transitions. [2021-05-02 18:53:44,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-05-02 18:53:44,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:44,222 INFO L523 BasicCegarLoop]: trace histogram [75, 75, 72, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:44,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:53:44,425 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:44,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:44,425 INFO L82 PathProgramCache]: Analyzing trace with hash 2140917923, now seen corresponding path program 6 times [2021-05-02 18:53:44,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:44,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172343406] [2021-05-02 18:53:44,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:44,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:44,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 18:53:44,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2021-05-02 18:53:44,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179 [2021-05-02 18:53:44,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,903 INFO L134 CoverageAnalysis]: Checked inductivity of 8579 backedges. 3858 proven. 925 refuted. 0 times theorem prover too weak. 3796 trivial. 0 not checked. [2021-05-02 18:53:44,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:44,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172343406] [2021-05-02 18:53:44,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172343406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:44,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65205921] [2021-05-02 18:53:44,903 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:44,986 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 18:53:44,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:44,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:53:44,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:44,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:44,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:45,575 INFO L134 CoverageAnalysis]: Checked inductivity of 8579 backedges. 3943 proven. 1 refuted. 0 times theorem prover too weak. 4635 trivial. 0 not checked. [2021-05-02 18:53:45,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65205921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:45,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:45,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 12] total 40 [2021-05-02 18:53:45,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077063565] [2021-05-02 18:53:45,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 18:53:45,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:45,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 18:53:45,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1151, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:53:45,577 INFO L87 Difference]: Start difference. First operand 1084 states and 1252 transitions. Second operand has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 18:53:46,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:46,900 INFO L93 Difference]: Finished difference Result 1218 states and 1399 transitions. [2021-05-02 18:53:46,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:53:46,913 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 269 [2021-05-02 18:53:46,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:46,914 INFO L225 Difference]: With dead ends: 1218 [2021-05-02 18:53:46,914 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:53:46,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 1547.0ms TimeCoverageRelationStatistics Valid=1347, Invalid=4055, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:53:46,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:53:46,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:53:46,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 18:53:46,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:53:46,915 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 269 [2021-05-02 18:53:46,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:46,915 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:53:46,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 18:53:46,915 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:53:46,915 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:53:47,138 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:53:47,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:53:47 BasicIcfg [2021-05-02 18:53:47,142 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:53:47,143 INFO L168 Benchmark]: Toolchain (without parser) took 65716.71 ms. Allocated memory was 177.2 MB in the beginning and 443.5 MB in the end (delta: 266.3 MB). Free memory was 143.2 MB in the beginning and 185.1 MB in the end (delta: -41.9 MB). Peak memory consumption was 224.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,143 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 177.2 MB. Free memory is still 159.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:53:47,143 INFO L168 Benchmark]: CACSL2BoogieTranslator took 195.85 ms. Allocated memory is still 177.2 MB. Free memory was 142.9 MB in the beginning and 133.1 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,143 INFO L168 Benchmark]: Boogie Preprocessor took 60.72 ms. Allocated memory is still 177.2 MB. Free memory was 133.1 MB in the beginning and 161.5 MB in the end (delta: -28.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,143 INFO L168 Benchmark]: RCFGBuilder took 440.33 ms. Allocated memory is still 177.2 MB. Free memory was 161.2 MB in the beginning and 145.4 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,147 INFO L168 Benchmark]: IcfgTransformer took 20.60 ms. Allocated memory is still 177.2 MB. Free memory was 145.4 MB in the beginning and 144.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,147 INFO L168 Benchmark]: TraceAbstraction took 64991.81 ms. Allocated memory was 177.2 MB in the beginning and 443.5 MB in the end (delta: 266.3 MB). Free memory was 143.5 MB in the beginning and 185.1 MB in the end (delta: -41.6 MB). Peak memory consumption was 226.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:53:47,150 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 177.2 MB. Free memory is still 159.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 195.85 ms. Allocated memory is still 177.2 MB. Free memory was 142.9 MB in the beginning and 133.1 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 60.72 ms. Allocated memory is still 177.2 MB. Free memory was 133.1 MB in the beginning and 161.5 MB in the end (delta: -28.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 440.33 ms. Allocated memory is still 177.2 MB. Free memory was 161.2 MB in the beginning and 145.4 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 20.60 ms. Allocated memory is still 177.2 MB. Free memory was 145.4 MB in the beginning and 144.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 64991.81 ms. Allocated memory was 177.2 MB in the beginning and 443.5 MB in the end (delta: 266.3 MB). Free memory was 143.5 MB in the beginning and 185.1 MB in the end (delta: -41.6 MB). Peak memory consumption was 226.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 64929.7ms, OverallIterations: 39, TraceHistogramMax: 75, EmptinessCheckTime: 62.9ms, AutomataDifference: 33673.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 884 SDtfs, 7792 SDslu, 1603 SDs, 0 SdLazy, 21402 SolverSat, 1918 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9409.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5027 GetRequests, 3240 SyntacticMatches, 1 SemanticMatches, 1786 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54826 ImplicationChecksByTransitivity, 33115.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=2007occurred in iteration=35, InterpolantAutomatonStates: 1293, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 505.1ms AutomataMinimizationTime, 39 MinimizatonAttempts, 5161 StatesRemovedByMinimization, 36 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 487.3ms SsaConstructionTime, 1372.2ms SatisfiabilityAnalysisTime, 20751.4ms InterpolantComputationTime, 6840 NumberOfCodeBlocks, 6065 NumberOfCodeBlocksAsserted, 168 NumberOfCheckSat, 6769 ConstructedInterpolants, 0 QuantifiedInterpolants, 27461 SizeOfPredicates, 84 NumberOfNonLiveVariables, 7258 ConjunctsInSsa, 564 ConjunctsInUnsatCore, 71 InterpolantComputations, 11 PerfectInterpolantSequences, 73915/100785 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...