/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:23:29,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:23:29,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:23:29,346 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:23:29,363 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:23:29,364 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:23:29,365 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:23:29,366 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:23:29,368 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:23:29,369 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:23:29,370 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:23:29,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:23:29,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:23:29,378 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:23:29,380 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:23:29,381 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:23:29,386 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:23:29,394 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:23:29,394 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:23:29,395 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:23:29,395 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:23:29,409 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:23:29,409 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:23:29,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:23:29,412 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:23:29,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:23:29,412 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:23:29,412 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:23:29,412 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:23:29,413 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:23:29,413 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:23:29,413 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:23:29,414 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:23:29,414 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:29,415 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:23:29,415 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:23:29,416 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:23:29,416 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:23:29,687 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:23:29,703 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:23:29,705 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:23:29,706 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:23:29,706 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:23:29,707 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2021-05-02 18:23:29,754 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f79f7e08/57f9985b0bf34808886babb39559d208/FLAG12ad0d5ca [2021-05-02 18:23:30,147 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:23:30,147 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2021-05-02 18:23:30,152 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f79f7e08/57f9985b0bf34808886babb39559d208/FLAG12ad0d5ca [2021-05-02 18:23:30,166 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f79f7e08/57f9985b0bf34808886babb39559d208 [2021-05-02 18:23:30,168 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:23:30,170 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:23:30,173 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:30,173 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:23:30,176 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:23:30,177 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,177 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7759186c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30, skipping insertion in model container [2021-05-02 18:23:30,177 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,182 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:23:30,193 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:23:30,309 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2021-05-02 18:23:30,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:30,327 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:23:30,335 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2021-05-02 18:23:30,342 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:30,372 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:23:30,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30 WrapperNode [2021-05-02 18:23:30,373 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:30,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:23:30,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:23:30,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:23:30,404 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,405 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,418 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,428 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,432 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,435 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,438 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:23:30,440 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:23:30,440 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:23:30,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:23:30,441 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (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 18:23:30,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:23:30,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:23:30,496 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:23:30,496 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:23:30,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:23:30,496 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:23:30,496 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:23:30,496 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:23:30,496 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:23:30,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:23:30,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:23:30,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:23:30,649 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:23:30,649 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 18:23:30,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:30 BoogieIcfgContainer [2021-05-02 18:23:30,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:23:30,651 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:23:30,651 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:23:30,652 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:23:30,654 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:30" (1/1) ... [2021-05-02 18:23:30,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:30 BasicIcfg [2021-05-02 18:23:30,664 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:23:30,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:23:30,665 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:23:30,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:23:30,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:23:30" (1/4) ... [2021-05-02 18:23:30,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1a91d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:30, skipping insertion in model container [2021-05-02 18:23:30,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:30" (2/4) ... [2021-05-02 18:23:30,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1a91d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:30, skipping insertion in model container [2021-05-02 18:23:30,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:30" (3/4) ... [2021-05-02 18:23:30,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1a91d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:23:30, skipping insertion in model container [2021-05-02 18:23:30,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:30" (4/4) ... [2021-05-02 18:23:30,669 INFO L111 eAbstractionObserver]: Analyzing ICFG nested-3.cJordan [2021-05-02 18:23:30,676 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:23:30,680 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:23:30,692 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:23:30,714 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:23:30,714 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:23:30,714 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:23:30,714 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:23:30,714 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:23:30,714 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:23:30,714 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:23:30,714 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:23:30,726 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:30,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:23:30,732 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:30,732 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:30,733 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:30,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:30,737 INFO L82 PathProgramCache]: Analyzing trace with hash -617670298, now seen corresponding path program 1 times [2021-05-02 18:23:30,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:30,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652801341] [2021-05-02 18:23:30,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:30,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:30,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:30,942 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 18:23:30,942 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:30,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652801341] [2021-05-02 18:23:30,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652801341] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:30,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:30,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:23:30,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027491092] [2021-05-02 18:23:30,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:30,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:30,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:30,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:30,955 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:31,029 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-05-02 18:23:31,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:31,031 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:23:31,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:31,035 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:23:31,035 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:23:31,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:31,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:23:31,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-02 18:23:31,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:31,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 18:23:31,056 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2021-05-02 18:23:31,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:31,056 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 18:23:31,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,057 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 18:23:31,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:23:31,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:31,057 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:31,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:23:31,058 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:31,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:31,058 INFO L82 PathProgramCache]: Analyzing trace with hash -1333032525, now seen corresponding path program 1 times [2021-05-02 18:23:31,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:31,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642412956] [2021-05-02 18:23:31,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:31,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:31,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,116 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 18:23:31,116 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:31,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642412956] [2021-05-02 18:23:31,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642412956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:31,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315072057] [2021-05-02 18:23:31,124 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 18:23:31,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 2 conjunts are in the unsatisfiable core [2021-05-02 18:23:31,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:31,240 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 18:23:31,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315072057] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:31,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:31,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-05-02 18:23:31,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97557385] [2021-05-02 18:23:31,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:31,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:31,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:31,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:31,246 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:31,264 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-05-02 18:23:31,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:31,265 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:23:31,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:31,267 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:23:31,267 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:23:31,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 33.5ms TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:31,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:23:31,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 18:23:31,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:31,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 18:23:31,276 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2021-05-02 18:23:31,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:31,276 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 18:23:31,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,279 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 18:23:31,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:23:31,280 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:31,280 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:31,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 18:23:31,507 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:31,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:31,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1332109004, now seen corresponding path program 1 times [2021-05-02 18:23:31,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:31,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305777494] [2021-05-02 18:23:31,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:31,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:31,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,565 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 18:23:31,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:31,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305777494] [2021-05-02 18:23:31,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305777494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:31,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587272500] [2021-05-02 18:23:31,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:31,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:31,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 18:23:31,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:31,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:31,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:31,686 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 18:23:31,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587272500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:31,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:31,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:23:31,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967831503] [2021-05-02 18:23:31,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:23:31,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:31,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:23:31,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:31,689 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:31,753 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 18:23:31,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:23:31,753 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:23:31,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:31,754 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:23:31,754 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 18:23:31,754 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 24.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:31,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 18:23:31,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 18:23:31,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:31,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-05-02 18:23:31,756 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2021-05-02 18:23:31,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:31,757 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-05-02 18:23:31,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:31,757 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-05-02 18:23:31,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:23:31,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:31,757 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:31,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:31,958 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:31,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:31,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1060490809, now seen corresponding path program 2 times [2021-05-02 18:23:31,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:31,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228957918] [2021-05-02 18:23:31,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:31,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:32,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:32,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:32,033 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 18:23:32,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:32,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228957918] [2021-05-02 18:23:32,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228957918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:32,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132957766] [2021-05-02 18:23:32,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:32,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:32,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:32,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:23:32,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:32,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:23:32,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132957766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:32,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:32,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 18:23:32,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098288254] [2021-05-02 18:23:32,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:23:32,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:32,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:23:32,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:23:32,153 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:32,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:32,317 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2021-05-02 18:23:32,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:23:32,317 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 18:23:32,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:32,318 INFO L225 Difference]: With dead ends: 54 [2021-05-02 18:23:32,318 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 18:23:32,319 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 84.5ms TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:32,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 18:23:32,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2021-05-02 18:23:32,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 38 states have internal predecessors, (49), 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 18:23:32,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2021-05-02 18:23:32,323 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 20 [2021-05-02 18:23:32,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:32,323 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2021-05-02 18:23:32,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:32,323 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2021-05-02 18:23:32,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:23:32,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:32,324 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:32,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:32,533 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:32,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:32,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1643995475, now seen corresponding path program 1 times [2021-05-02 18:23:32,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:32,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325834025] [2021-05-02 18:23:32,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:32,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:32,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:32,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:32,594 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 18:23:32,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:32,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325834025] [2021-05-02 18:23:32,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325834025] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:32,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448687667] [2021-05-02 18:23:32,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 18:23:32,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:32,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:23:32,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:32,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:32,708 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 18:23:32,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448687667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:32,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:32,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:23:32,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931252743] [2021-05-02 18:23:32,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:23:32,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:32,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:23:32,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:32,709 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:32,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:32,780 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2021-05-02 18:23:32,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:23:32,781 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 18:23:32,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:32,782 INFO L225 Difference]: With dead ends: 71 [2021-05-02 18:23:32,782 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 18:23:32,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 34.4ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:32,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 18:23:32,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 51. [2021-05-02 18:23:32,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 44 states have internal predecessors, (57), 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 18:23:32,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-05-02 18:23:32,789 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 23 [2021-05-02 18:23:32,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:32,790 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-05-02 18:23:32,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:32,790 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-05-02 18:23:32,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:23:32,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:32,790 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:32,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:32,993 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:32,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:32,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1874196390, now seen corresponding path program 2 times [2021-05-02 18:23:32,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:32,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799242541] [2021-05-02 18:23:32,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:33,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:33,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,082 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 18:23:33,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:33,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799242541] [2021-05-02 18:23:33,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799242541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:33,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479408] [2021-05-02 18:23:33,083 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 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 18:23:33,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:33,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:33,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 18:23:33,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:33,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,175 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:23:33,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479408] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:33,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:33,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-05-02 18:23:33,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828470503] [2021-05-02 18:23:33,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:33,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:33,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:33,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:33,177 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:33,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:33,214 INFO L93 Difference]: Finished difference Result 83 states and 102 transitions. [2021-05-02 18:23:33,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:33,214 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 18:23:33,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:33,216 INFO L225 Difference]: With dead ends: 83 [2021-05-02 18:23:33,217 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 18:23:33,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 59.5ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:33,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 18:23:33,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 71. [2021-05-02 18:23:33,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 63 states have (on average 1.2698412698412698) internal successors, (80), 64 states have internal predecessors, (80), 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 18:23:33,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 87 transitions. [2021-05-02 18:23:33,233 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 87 transitions. Word has length 26 [2021-05-02 18:23:33,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:33,233 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 87 transitions. [2021-05-02 18:23:33,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:33,233 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 87 transitions. [2021-05-02 18:23:33,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:23:33,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:33,234 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:33,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 18:23:33,449 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:33,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:33,449 INFO L82 PathProgramCache]: Analyzing trace with hash -913219097, now seen corresponding path program 3 times [2021-05-02 18:23:33,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:33,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154605616] [2021-05-02 18:23:33,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:33,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:33,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,505 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 18:23:33,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:33,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154605616] [2021-05-02 18:23:33,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154605616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:33,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052366784] [2021-05-02 18:23:33,505 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 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 18:23:33,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:23:33,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:33,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:23:33,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:33,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:33,653 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 18:23:33,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052366784] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:33,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:33,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2021-05-02 18:23:33,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584616097] [2021-05-02 18:23:33,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:23:33,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:33,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:23:33,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:23:33,655 INFO L87 Difference]: Start difference. First operand 71 states and 87 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:33,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:33,700 INFO L93 Difference]: Finished difference Result 122 states and 148 transitions. [2021-05-02 18:23:33,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:23:33,701 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 18:23:33,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:33,702 INFO L225 Difference]: With dead ends: 122 [2021-05-02 18:23:33,702 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 18:23:33,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 90.2ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:23:33,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 18:23:33,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2021-05-02 18:23:33,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 108 states have (on average 1.25) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:33,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 146 transitions. [2021-05-02 18:23:33,707 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 146 transitions. Word has length 26 [2021-05-02 18:23:33,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:33,708 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 146 transitions. [2021-05-02 18:23:33,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:33,708 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 146 transitions. [2021-05-02 18:23:33,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:23:33,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:33,709 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:33,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:33,915 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:33,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:33,915 INFO L82 PathProgramCache]: Analyzing trace with hash 848494886, now seen corresponding path program 1 times [2021-05-02 18:23:33,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:33,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157827176] [2021-05-02 18:23:33,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:33,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:33,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:33,973 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 18:23:33,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:33,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157827176] [2021-05-02 18:23:33,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157827176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:33,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381206900] [2021-05-02 18:23:33,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:34,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:34,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:23:34,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:34,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,076 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 18:23:34,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381206900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:34,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:34,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:23:34,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283945044] [2021-05-02 18:23:34,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:23:34,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:34,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:23:34,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:23:34,077 INFO L87 Difference]: Start difference. First operand 120 states and 146 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:34,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:34,135 INFO L93 Difference]: Finished difference Result 170 states and 202 transitions. [2021-05-02 18:23:34,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:23:34,135 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 18:23:34,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:34,137 INFO L225 Difference]: With dead ends: 170 [2021-05-02 18:23:34,137 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 18:23:34,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 32.0ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:23:34,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 18:23:34,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 141. [2021-05-02 18:23:34,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 129 states have (on average 1.2325581395348837) internal successors, (159), 131 states have internal predecessors, (159), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:34,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2021-05-02 18:23:34,142 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 26 [2021-05-02 18:23:34,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:34,142 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2021-05-02 18:23:34,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:34,142 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2021-05-02 18:23:34,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:23:34,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:34,143 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:34,353 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:34,354 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:34,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:34,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1877810282, now seen corresponding path program 2 times [2021-05-02 18:23:34,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:34,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874810683] [2021-05-02 18:23:34,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:34,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:34,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:34,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:34,423 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 18:23:34,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:34,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874810683] [2021-05-02 18:23:34,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874810683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:34,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019513141] [2021-05-02 18:23:34,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:34,480 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:34,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:34,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:23:34,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:34,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:34,533 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:23:34,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019513141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:34,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:34,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2021-05-02 18:23:34,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270313498] [2021-05-02 18:23:34,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:23:34,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:34,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:23:34,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:34,535 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:34,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:34,695 INFO L93 Difference]: Finished difference Result 265 states and 310 transitions. [2021-05-02 18:23:34,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:23:34,695 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:23:34,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:34,696 INFO L225 Difference]: With dead ends: 265 [2021-05-02 18:23:34,696 INFO L226 Difference]: Without dead ends: 265 [2021-05-02 18:23:34,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 91.6ms TimeCoverageRelationStatistics Valid=102, Invalid=240, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:23:34,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-05-02 18:23:34,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 156. [2021-05-02 18:23:34,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 144 states have (on average 1.2291666666666667) internal successors, (177), 146 states have internal predecessors, (177), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:34,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 188 transitions. [2021-05-02 18:23:34,711 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 188 transitions. Word has length 29 [2021-05-02 18:23:34,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:34,712 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 188 transitions. [2021-05-02 18:23:34,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:34,712 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 188 transitions. [2021-05-02 18:23:34,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:23:34,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:34,716 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:34,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:23:34,925 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:34,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:34,925 INFO L82 PathProgramCache]: Analyzing trace with hash 2099887752, now seen corresponding path program 3 times [2021-05-02 18:23:34,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:34,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000099852] [2021-05-02 18:23:34,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:34,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:34,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:34,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:34,986 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 18:23:34,986 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:34,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000099852] [2021-05-02 18:23:34,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000099852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:34,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363608359] [2021-05-02 18:23:34,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:35,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:23:35,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:35,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:23:35,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:35,071 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 18:23:35,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363608359] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:35,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:35,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2021-05-02 18:23:35,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24141155] [2021-05-02 18:23:35,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:35,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:35,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:35,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:35,073 INFO L87 Difference]: Start difference. First operand 156 states and 188 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:35,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:35,103 INFO L93 Difference]: Finished difference Result 194 states and 229 transitions. [2021-05-02 18:23:35,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:23:35,104 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:23:35,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:35,105 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:23:35,105 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 18:23:35,105 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 52.7ms TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:23:35,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 18:23:35,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 162. [2021-05-02 18:23:35,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 150 states have (on average 1.22) internal successors, (183), 152 states have internal predecessors, (183), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:35,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 194 transitions. [2021-05-02 18:23:35,109 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 194 transitions. Word has length 32 [2021-05-02 18:23:35,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:35,109 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 194 transitions. [2021-05-02 18:23:35,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:35,109 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 194 transitions. [2021-05-02 18:23:35,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:23:35,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:35,110 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:35,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:35,327 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:35,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:35,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1384697434, now seen corresponding path program 4 times [2021-05-02 18:23:35,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:35,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997240464] [2021-05-02 18:23:35,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:35,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:35,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:35,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:35,400 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 18:23:35,400 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:35,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997240464] [2021-05-02 18:23:35,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997240464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:35,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16611458] [2021-05-02 18:23:35,400 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:35,440 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:35,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:35,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:23:35,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:35,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,495 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 18:23:35,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16611458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:35,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:35,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:23:35,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647084433] [2021-05-02 18:23:35,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:35,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:35,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:35,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:35,497 INFO L87 Difference]: Start difference. First operand 162 states and 194 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:35,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:35,558 INFO L93 Difference]: Finished difference Result 247 states and 285 transitions. [2021-05-02 18:23:35,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:23:35,559 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:23:35,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:35,561 INFO L225 Difference]: With dead ends: 247 [2021-05-02 18:23:35,561 INFO L226 Difference]: Without dead ends: 247 [2021-05-02 18:23:35,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 40.3ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:35,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-02 18:23:35,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 183. [2021-05-02 18:23:35,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 171 states have (on average 1.2105263157894737) internal successors, (207), 173 states have internal predecessors, (207), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:35,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2021-05-02 18:23:35,565 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 32 [2021-05-02 18:23:35,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:35,566 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2021-05-02 18:23:35,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:35,566 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2021-05-02 18:23:35,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:23:35,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:35,566 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:35,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:35,783 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:35,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:35,783 INFO L82 PathProgramCache]: Analyzing trace with hash 69736820, now seen corresponding path program 5 times [2021-05-02 18:23:35,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:35,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677287119] [2021-05-02 18:23:35,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:35,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:35,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:35,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:35,853 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 18:23:35,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:35,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677287119] [2021-05-02 18:23:35,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677287119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:35,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499616847] [2021-05-02 18:23:35,854 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:35,883 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 18:23:35,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:35,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:23:35,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:35,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:35,974 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 18:23:35,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499616847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:35,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:35,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:23:35,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304844406] [2021-05-02 18:23:35,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:23:35,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:35,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:23:35,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:35,975 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:36,042 INFO L93 Difference]: Finished difference Result 268 states and 309 transitions. [2021-05-02 18:23:36,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:23:36,043 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 18:23:36,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:36,044 INFO L225 Difference]: With dead ends: 268 [2021-05-02 18:23:36,044 INFO L226 Difference]: Without dead ends: 268 [2021-05-02 18:23:36,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 45.6ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:36,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-05-02 18:23:36,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 204. [2021-05-02 18:23:36,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 192 states have (on average 1.203125) internal successors, (231), 194 states have internal predecessors, (231), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:36,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 242 transitions. [2021-05-02 18:23:36,049 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 242 transitions. Word has length 35 [2021-05-02 18:23:36,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:36,049 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 242 transitions. [2021-05-02 18:23:36,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,050 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 242 transitions. [2021-05-02 18:23:36,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:23:36,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:36,050 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:36,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:23:36,253 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:36,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:36,253 INFO L82 PathProgramCache]: Analyzing trace with hash 1490515686, now seen corresponding path program 6 times [2021-05-02 18:23:36,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:36,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614904759] [2021-05-02 18:23:36,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:36,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:36,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,333 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 18:23:36,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:36,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614904759] [2021-05-02 18:23:36,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614904759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:36,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284755659] [2021-05-02 18:23:36,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:36,368 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 18:23:36,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:36,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:23:36,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:36,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:36,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:36,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:36,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:36,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:36,522 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 18:23:36,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284755659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:36,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:36,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 19 [2021-05-02 18:23:36,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862906890] [2021-05-02 18:23:36,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:23:36,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:36,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:23:36,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:23:36,524 INFO L87 Difference]: Start difference. First operand 204 states and 242 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:36,579 INFO L93 Difference]: Finished difference Result 211 states and 249 transitions. [2021-05-02 18:23:36,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:23:36,579 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 18:23:36,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:36,580 INFO L225 Difference]: With dead ends: 211 [2021-05-02 18:23:36,580 INFO L226 Difference]: Without dead ends: 211 [2021-05-02 18:23:36,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 134.6ms TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:23:36,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-02 18:23:36,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 204. [2021-05-02 18:23:36,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 192 states have (on average 1.203125) internal successors, (231), 194 states have internal predecessors, (231), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:36,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 242 transitions. [2021-05-02 18:23:36,584 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 242 transitions. Word has length 38 [2021-05-02 18:23:36,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:36,585 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 242 transitions. [2021-05-02 18:23:36,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,585 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 242 transitions. [2021-05-02 18:23:36,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:23:36,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:36,585 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:36,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:23:36,801 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:36,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:36,801 INFO L82 PathProgramCache]: Analyzing trace with hash -289233147, now seen corresponding path program 1 times [2021-05-02 18:23:36,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:36,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417603173] [2021-05-02 18:23:36,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:36,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:36,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,855 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 18:23:36,856 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:36,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417603173] [2021-05-02 18:23:36,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417603173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:36,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:36,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:23:36,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121231384] [2021-05-02 18:23:36,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:36,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:36,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:36,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:36,858 INFO L87 Difference]: Start difference. First operand 204 states and 242 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:36,883 INFO L93 Difference]: Finished difference Result 211 states and 250 transitions. [2021-05-02 18:23:36,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:36,883 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 18:23:36,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:36,885 INFO L225 Difference]: With dead ends: 211 [2021-05-02 18:23:36,885 INFO L226 Difference]: Without dead ends: 211 [2021-05-02 18:23:36,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:36,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-02 18:23:36,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 200. [2021-05-02 18:23:36,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 188 states have (on average 1.196808510638298) internal successors, (225), 190 states have internal predecessors, (225), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:36,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 236 transitions. [2021-05-02 18:23:36,891 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 236 transitions. Word has length 38 [2021-05-02 18:23:36,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:36,891 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 236 transitions. [2021-05-02 18:23:36,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:36,891 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 236 transitions. [2021-05-02 18:23:36,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:23:36,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:36,892 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:36,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 18:23:36,893 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:36,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:36,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1995492923, now seen corresponding path program 1 times [2021-05-02 18:23:36,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:36,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863978678] [2021-05-02 18:23:36,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:36,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:36,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-02 18:23:36,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:36,996 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 212 proven. 92 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-05-02 18:23:36,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:36,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863978678] [2021-05-02 18:23:36,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863978678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:36,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444475810] [2021-05-02 18:23:36,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:37,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:37,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:37,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:37,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,141 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 210 proven. 92 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-05-02 18:23:37,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444475810] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:37,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:37,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 18:23:37,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734644576] [2021-05-02 18:23:37,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:23:37,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:37,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:23:37,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:23:37,142 INFO L87 Difference]: Start difference. First operand 200 states and 236 transitions. Second operand has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:37,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:37,224 INFO L93 Difference]: Finished difference Result 285 states and 327 transitions. [2021-05-02 18:23:37,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:23:37,225 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 71 [2021-05-02 18:23:37,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:37,226 INFO L225 Difference]: With dead ends: 285 [2021-05-02 18:23:37,226 INFO L226 Difference]: Without dead ends: 285 [2021-05-02 18:23:37,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 51.3ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:23:37,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-05-02 18:23:37,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 221. [2021-05-02 18:23:37,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 209 states have (on average 1.1913875598086126) internal successors, (249), 211 states have internal predecessors, (249), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:37,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 260 transitions. [2021-05-02 18:23:37,230 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 260 transitions. Word has length 71 [2021-05-02 18:23:37,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:37,231 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 260 transitions. [2021-05-02 18:23:37,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:37,231 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 260 transitions. [2021-05-02 18:23:37,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:23:37,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:37,232 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:37,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:23:37,442 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:37,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:37,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1422304033, now seen corresponding path program 2 times [2021-05-02 18:23:37,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:37,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262031332] [2021-05-02 18:23:37,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:37,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:37,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:37,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:37,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 18:23:37,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:37,551 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 265 proven. 117 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 18:23:37,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:37,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262031332] [2021-05-02 18:23:37,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262031332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:37,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698656269] [2021-05-02 18:23:37,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:37,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:37,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:37,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:23:37,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:37,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:37,689 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-05-02 18:23:37,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698656269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:37,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:37,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:23:37,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598769665] [2021-05-02 18:23:37,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:37,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:37,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:37,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:37,690 INFO L87 Difference]: Start difference. First operand 221 states and 260 transitions. Second operand has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:37,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:37,747 INFO L93 Difference]: Finished difference Result 306 states and 351 transitions. [2021-05-02 18:23:37,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:23:37,748 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 77 [2021-05-02 18:23:37,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:37,749 INFO L225 Difference]: With dead ends: 306 [2021-05-02 18:23:37,749 INFO L226 Difference]: Without dead ends: 306 [2021-05-02 18:23:37,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 83.4ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:37,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-05-02 18:23:37,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 242. [2021-05-02 18:23:37,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 230 states have (on average 1.1869565217391305) internal successors, (273), 232 states have internal predecessors, (273), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:23:37,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 284 transitions. [2021-05-02 18:23:37,754 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 284 transitions. Word has length 77 [2021-05-02 18:23:37,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:37,754 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 284 transitions. [2021-05-02 18:23:37,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:37,754 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 284 transitions. [2021-05-02 18:23:37,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:23:37,754 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:37,754 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:37,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:37,969 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:37,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:37,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1678738245, now seen corresponding path program 3 times [2021-05-02 18:23:37,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:37,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852361469] [2021-05-02 18:23:37,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:37,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:38,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:38,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:38,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-02 18:23:38,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:38,068 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 324 proven. 145 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-05-02 18:23:38,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:38,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852361469] [2021-05-02 18:23:38,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852361469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:38,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321266130] [2021-05-02 18:23:38,069 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:38,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:23:38,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:38,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:23:38,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:38,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:38,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:38,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:38,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:38,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:38,303 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 30 proven. 325 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-05-02 18:23:38,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321266130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:38,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:38,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2021-05-02 18:23:38,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795918864] [2021-05-02 18:23:38,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:23:38,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:38,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:23:38,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=361, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:23:38,305 INFO L87 Difference]: Start difference. First operand 242 states and 284 transitions. Second operand has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:38,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:38,850 INFO L93 Difference]: Finished difference Result 540 states and 619 transitions. [2021-05-02 18:23:38,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:23:38,851 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 83 [2021-05-02 18:23:38,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:38,852 INFO L225 Difference]: With dead ends: 540 [2021-05-02 18:23:38,852 INFO L226 Difference]: Without dead ends: 540 [2021-05-02 18:23:38,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 429.5ms TimeCoverageRelationStatistics Valid=441, Invalid=1629, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:23:38,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-02 18:23:38,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 422. [2021-05-02 18:23:38,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 405 states have (on average 1.1876543209876542) internal successors, (481), 408 states have internal predecessors, (481), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 18:23:38,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 498 transitions. [2021-05-02 18:23:38,859 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 498 transitions. Word has length 83 [2021-05-02 18:23:38,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:38,859 INFO L480 AbstractCegarLoop]: Abstraction has 422 states and 498 transitions. [2021-05-02 18:23:38,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:38,860 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 498 transitions. [2021-05-02 18:23:38,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:23:38,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:38,861 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:39,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:39,077 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:39,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:39,077 INFO L82 PathProgramCache]: Analyzing trace with hash 785610242, now seen corresponding path program 1 times [2021-05-02 18:23:39,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:39,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415875384] [2021-05-02 18:23:39,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:39,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:39,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 18:23:39,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,184 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 391 proven. 176 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-05-02 18:23:39,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:39,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415875384] [2021-05-02 18:23:39,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415875384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:39,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666557694] [2021-05-02 18:23:39,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 18:23:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:23:39,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:39,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,323 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 387 proven. 176 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 18:23:39,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666557694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:39,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:39,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:23:39,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848018085] [2021-05-02 18:23:39,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:23:39,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:39,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:23:39,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:23:39,325 INFO L87 Difference]: Start difference. First operand 422 states and 498 transitions. Second operand has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:39,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:39,407 INFO L93 Difference]: Finished difference Result 549 states and 633 transitions. [2021-05-02 18:23:39,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:23:39,407 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 89 [2021-05-02 18:23:39,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:39,409 INFO L225 Difference]: With dead ends: 549 [2021-05-02 18:23:39,409 INFO L226 Difference]: Without dead ends: 549 [2021-05-02 18:23:39,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 84.7ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:23:39,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-02 18:23:39,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 443. [2021-05-02 18:23:39,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 426 states have (on average 1.1854460093896713) internal successors, (505), 429 states have internal predecessors, (505), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 18:23:39,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 522 transitions. [2021-05-02 18:23:39,418 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 522 transitions. Word has length 89 [2021-05-02 18:23:39,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:39,418 INFO L480 AbstractCegarLoop]: Abstraction has 443 states and 522 transitions. [2021-05-02 18:23:39,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:39,419 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 522 transitions. [2021-05-02 18:23:39,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 18:23:39,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:39,420 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:39,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:39,629 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:39,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:39,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1708712572, now seen corresponding path program 2 times [2021-05-02 18:23:39,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:39,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756384337] [2021-05-02 18:23:39,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:39,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:39,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-02 18:23:39,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:39,734 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 460 proven. 210 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2021-05-02 18:23:39,734 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:39,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756384337] [2021-05-02 18:23:39,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756384337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:39,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896736609] [2021-05-02 18:23:39,734 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 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 18:23:39,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:39,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:39,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:23:39,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:39,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:39,901 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 6 proven. 183 refuted. 0 times theorem prover too weak. 694 trivial. 0 not checked. [2021-05-02 18:23:39,901 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896736609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:39,901 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:39,901 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7] total 19 [2021-05-02 18:23:39,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640953499] [2021-05-02 18:23:39,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:23:39,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:39,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:23:39,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:23:39,903 INFO L87 Difference]: Start difference. First operand 443 states and 522 transitions. Second operand has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:40,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:40,187 INFO L93 Difference]: Finished difference Result 1161 states and 1283 transitions. [2021-05-02 18:23:40,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:23:40,188 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 95 [2021-05-02 18:23:40,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:40,191 INFO L225 Difference]: With dead ends: 1161 [2021-05-02 18:23:40,191 INFO L226 Difference]: Without dead ends: 1161 [2021-05-02 18:23:40,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 223.4ms TimeCoverageRelationStatistics Valid=340, Invalid=716, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:23:40,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1161 states. [2021-05-02 18:23:40,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1161 to 467. [2021-05-02 18:23:40,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 450 states have (on average 1.1866666666666668) internal successors, (534), 453 states have internal predecessors, (534), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 18:23:40,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 551 transitions. [2021-05-02 18:23:40,203 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 551 transitions. Word has length 95 [2021-05-02 18:23:40,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:40,203 INFO L480 AbstractCegarLoop]: Abstraction has 467 states and 551 transitions. [2021-05-02 18:23:40,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:40,203 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 551 transitions. [2021-05-02 18:23:40,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:23:40,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:40,204 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 24, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:40,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:23:40,419 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:40,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:40,420 INFO L82 PathProgramCache]: Analyzing trace with hash -413272796, now seen corresponding path program 3 times [2021-05-02 18:23:40,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:40,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135792176] [2021-05-02 18:23:40,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:40,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:40,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:40,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:40,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-02 18:23:40,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:40,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1034 backedges. 537 proven. 247 refuted. 0 times theorem prover too weak. 250 trivial. 0 not checked. [2021-05-02 18:23:40,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:40,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135792176] [2021-05-02 18:23:40,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135792176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:40,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398642593] [2021-05-02 18:23:40,560 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 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 18:23:40,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:23:40,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:40,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:23:40,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:40,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:40,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:40,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:40,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:40,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:40,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1034 backedges. 575 proven. 27 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2021-05-02 18:23:40,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398642593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:40,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:40,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11] total 26 [2021-05-02 18:23:40,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092595054] [2021-05-02 18:23:40,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:23:40,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:40,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:23:40,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:23:40,801 INFO L87 Difference]: Start difference. First operand 467 states and 551 transitions. Second operand has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:43,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:43,596 INFO L93 Difference]: Finished difference Result 1357 states and 1524 transitions. [2021-05-02 18:23:43,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-02 18:23:43,596 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 101 [2021-05-02 18:23:43,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:43,600 INFO L225 Difference]: With dead ends: 1357 [2021-05-02 18:23:43,600 INFO L226 Difference]: Without dead ends: 1357 [2021-05-02 18:23:43,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9033 ImplicationChecksByTransitivity, 2554.9ms TimeCoverageRelationStatistics Valid=4172, Invalid=19390, Unknown=0, NotChecked=0, Total=23562 [2021-05-02 18:23:43,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-05-02 18:23:43,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 657. [2021-05-02 18:23:43,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 631 states have (on average 1.2060221870047543) internal successors, (761), 638 states have internal predecessors, (761), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:43,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 790 transitions. [2021-05-02 18:23:43,624 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 790 transitions. Word has length 101 [2021-05-02 18:23:43,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:43,624 INFO L480 AbstractCegarLoop]: Abstraction has 657 states and 790 transitions. [2021-05-02 18:23:43,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:43,624 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 790 transitions. [2021-05-02 18:23:43,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 18:23:43,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:43,626 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 28, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:43,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:23:43,842 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:43,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:43,842 INFO L82 PathProgramCache]: Analyzing trace with hash 770000631, now seen corresponding path program 4 times [2021-05-02 18:23:43,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:43,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117550017] [2021-05-02 18:23:43,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:43,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:43,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-02 18:23:43,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 665 proven. 287 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2021-05-02 18:23:43,975 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:43,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117550017] [2021-05-02 18:23:43,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117550017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:43,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7174103] [2021-05-02 18:23:43,975 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 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 18:23:44,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:44,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:44,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:23:44,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:44,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 661 proven. 330 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-05-02 18:23:44,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7174103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:44,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 20 [2021-05-02 18:23:44,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371509080] [2021-05-02 18:23:44,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:23:44,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:44,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:23:44,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:44,170 INFO L87 Difference]: Start difference. First operand 657 states and 790 transitions. Second operand has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:44,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:44,288 INFO L93 Difference]: Finished difference Result 1149 states and 1296 transitions. [2021-05-02 18:23:44,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:23:44,289 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 110 [2021-05-02 18:23:44,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:44,292 INFO L225 Difference]: With dead ends: 1149 [2021-05-02 18:23:44,292 INFO L226 Difference]: Without dead ends: 1149 [2021-05-02 18:23:44,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 113.0ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:44,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-05-02 18:23:44,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 708. [2021-05-02 18:23:44,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 708 states, 682 states have (on average 1.2008797653958945) internal successors, (819), 689 states have internal predecessors, (819), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:44,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 708 states to 708 states and 848 transitions. [2021-05-02 18:23:44,306 INFO L78 Accepts]: Start accepts. Automaton has 708 states and 848 transitions. Word has length 110 [2021-05-02 18:23:44,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:44,306 INFO L480 AbstractCegarLoop]: Abstraction has 708 states and 848 transitions. [2021-05-02 18:23:44,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:44,307 INFO L276 IsEmpty]: Start isEmpty. Operand 708 states and 848 transitions. [2021-05-02 18:23:44,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 18:23:44,308 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:44,308 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:44,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 18:23:44,524 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:44,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:44,524 INFO L82 PathProgramCache]: Analyzing trace with hash -24458842, now seen corresponding path program 5 times [2021-05-02 18:23:44,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:44,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323856521] [2021-05-02 18:23:44,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:44,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:44,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-02 18:23:44,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 806 proven. 376 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-05-02 18:23:44,703 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:44,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323856521] [2021-05-02 18:23:44,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323856521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872242194] [2021-05-02 18:23:44,704 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 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 18:23:44,757 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:23:44,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:44,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:23:44,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:44,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:44,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 802 proven. 376 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-05-02 18:23:44,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872242194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:44,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 18:23:44,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252287748] [2021-05-02 18:23:44,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 18:23:44,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:44,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 18:23:44,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:23:44,884 INFO L87 Difference]: Start difference. First operand 708 states and 848 transitions. Second operand has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:45,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:45,009 INFO L93 Difference]: Finished difference Result 1203 states and 1357 transitions. [2021-05-02 18:23:45,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:23:45,009 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 119 [2021-05-02 18:23:45,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:45,012 INFO L225 Difference]: With dead ends: 1203 [2021-05-02 18:23:45,013 INFO L226 Difference]: Without dead ends: 1203 [2021-05-02 18:23:45,013 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 147.3ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:23:45,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1203 states. [2021-05-02 18:23:45,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1203 to 756. [2021-05-02 18:23:45,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 756 states, 730 states have (on average 1.1972602739726028) internal successors, (874), 737 states have internal predecessors, (874), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:45,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 756 states to 756 states and 903 transitions. [2021-05-02 18:23:45,027 INFO L78 Accepts]: Start accepts. Automaton has 756 states and 903 transitions. Word has length 119 [2021-05-02 18:23:45,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:45,028 INFO L480 AbstractCegarLoop]: Abstraction has 756 states and 903 transitions. [2021-05-02 18:23:45,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:45,028 INFO L276 IsEmpty]: Start isEmpty. Operand 756 states and 903 transitions. [2021-05-02 18:23:45,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:23:45,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,029 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,243 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:23:45,244 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1482627326, now seen corresponding path program 6 times [2021-05-02 18:23:45,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138162301] [2021-05-02 18:23:45,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 18:23:45,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 907 proven. 425 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-05-02 18:23:45,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138162301] [2021-05-02 18:23:45,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138162301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067313096] [2021-05-02 18:23:45,413 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 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 18:23:45,460 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 18:23:45,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:45,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:23:45,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:45,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:45,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:45,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 941 proven. 0 refuted. 0 times theorem prover too weak. 817 trivial. 0 not checked. [2021-05-02 18:23:45,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067313096] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:45,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:45,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 24 [2021-05-02 18:23:45,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557061212] [2021-05-02 18:23:45,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:23:45,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:23:45,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:23:45,615 INFO L87 Difference]: Start difference. First operand 756 states and 903 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:45,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:45,651 INFO L93 Difference]: Finished difference Result 1043 states and 1248 transitions. [2021-05-02 18:23:45,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:23:45,652 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 125 [2021-05-02 18:23:45,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:45,654 INFO L225 Difference]: With dead ends: 1043 [2021-05-02 18:23:45,654 INFO L226 Difference]: Without dead ends: 1043 [2021-05-02 18:23:45,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 155.6ms TimeCoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:23:45,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1043 states. [2021-05-02 18:23:45,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1043 to 1041. [2021-05-02 18:23:45,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1041 states, 1007 states have (on average 1.201588877855015) internal successors, (1210), 1015 states have internal predecessors, (1210), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:23:45,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1041 states to 1041 states and 1247 transitions. [2021-05-02 18:23:45,670 INFO L78 Accepts]: Start accepts. Automaton has 1041 states and 1247 transitions. Word has length 125 [2021-05-02 18:23:45,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:45,671 INFO L480 AbstractCegarLoop]: Abstraction has 1041 states and 1247 transitions. [2021-05-02 18:23:45,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:45,671 INFO L276 IsEmpty]: Start isEmpty. Operand 1041 states and 1247 transitions. [2021-05-02 18:23:45,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:23:45,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,672 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 18:23:45,887 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1290178204, now seen corresponding path program 7 times [2021-05-02 18:23:45,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619655962] [2021-05-02 18:23:45,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:46,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 18:23:46,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 905 proven. 425 refuted. 0 times theorem prover too weak. 428 trivial. 0 not checked. [2021-05-02 18:23:46,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:46,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619655962] [2021-05-02 18:23:46,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619655962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014550353] [2021-05-02 18:23:46,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:23:46,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:23:46,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:46,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 903 proven. 425 refuted. 0 times theorem prover too weak. 430 trivial. 0 not checked. [2021-05-02 18:23:46,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014550353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:46,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 18:23:46,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759256998] [2021-05-02 18:23:46,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:23:46,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:46,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:23:46,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:23:46,263 INFO L87 Difference]: Start difference. First operand 1041 states and 1247 transitions. Second operand has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:46,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:46,410 INFO L93 Difference]: Finished difference Result 1772 states and 1998 transitions. [2021-05-02 18:23:46,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:23:46,411 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 125 [2021-05-02 18:23:46,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:46,430 INFO L225 Difference]: With dead ends: 1772 [2021-05-02 18:23:46,430 INFO L226 Difference]: Without dead ends: 1772 [2021-05-02 18:23:46,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 143.4ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:23:46,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1772 states. [2021-05-02 18:23:46,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1772 to 1107. [2021-05-02 18:23:46,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 1073 states have (on average 1.1985088536812676) internal successors, (1286), 1081 states have internal predecessors, (1286), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:23:46,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1323 transitions. [2021-05-02 18:23:46,451 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1323 transitions. Word has length 125 [2021-05-02 18:23:46,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:46,451 INFO L480 AbstractCegarLoop]: Abstraction has 1107 states and 1323 transitions. [2021-05-02 18:23:46,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:46,451 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1323 transitions. [2021-05-02 18:23:46,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:23:46,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:46,452 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:46,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:46,669 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:46,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:46,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1716243460, now seen corresponding path program 8 times [2021-05-02 18:23:46,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:46,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496248875] [2021-05-02 18:23:46,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:46,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:46,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-02 18:23:46,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1969 backedges. 1012 proven. 477 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-05-02 18:23:46,862 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:46,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496248875] [2021-05-02 18:23:46,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496248875] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53666249] [2021-05-02 18:23:46,862 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 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 18:23:46,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:46,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:46,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:23:46,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:46,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:46,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1969 backedges. 1010 proven. 477 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 18:23:47,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53666249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:47,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:23:47,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180863364] [2021-05-02 18:23:47,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:23:47,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:47,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:23:47,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:23:47,053 INFO L87 Difference]: Start difference. First operand 1107 states and 1323 transitions. Second operand has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:47,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:47,150 INFO L93 Difference]: Finished difference Result 1838 states and 2074 transitions. [2021-05-02 18:23:47,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:23:47,152 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 131 [2021-05-02 18:23:47,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:47,155 INFO L225 Difference]: With dead ends: 1838 [2021-05-02 18:23:47,155 INFO L226 Difference]: Without dead ends: 1838 [2021-05-02 18:23:47,156 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 155.3ms TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:23:47,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1838 states. [2021-05-02 18:23:47,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1838 to 1173. [2021-05-02 18:23:47,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1173 states, 1139 states have (on average 1.195785776997366) internal successors, (1362), 1147 states have internal predecessors, (1362), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:23:47,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1173 states to 1173 states and 1399 transitions. [2021-05-02 18:23:47,175 INFO L78 Accepts]: Start accepts. Automaton has 1173 states and 1399 transitions. Word has length 131 [2021-05-02 18:23:47,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:47,176 INFO L480 AbstractCegarLoop]: Abstraction has 1173 states and 1399 transitions. [2021-05-02 18:23:47,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:47,176 INFO L276 IsEmpty]: Start isEmpty. Operand 1173 states and 1399 transitions. [2021-05-02 18:23:47,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:23:47,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:47,177 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:47,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:23:47,393 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:47,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:47,393 INFO L82 PathProgramCache]: Analyzing trace with hash -393979164, now seen corresponding path program 9 times [2021-05-02 18:23:47,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:47,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095138821] [2021-05-02 18:23:47,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:47,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:47,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-02 18:23:47,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2192 backedges. 1125 proven. 532 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-05-02 18:23:47,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:47,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095138821] [2021-05-02 18:23:47,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095138821] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242648240] [2021-05-02 18:23:47,602 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:23:47,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:23:47,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:47,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:23:47,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:47,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2192 backedges. 57 proven. 1126 refuted. 0 times theorem prover too weak. 1009 trivial. 0 not checked. [2021-05-02 18:23:47,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242648240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:47,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 31 [2021-05-02 18:23:47,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44462762] [2021-05-02 18:23:47,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:23:47,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:47,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:23:47,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:23:47,940 INFO L87 Difference]: Start difference. First operand 1173 states and 1399 transitions. Second operand has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:48,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:48,928 INFO L93 Difference]: Finished difference Result 2134 states and 2407 transitions. [2021-05-02 18:23:48,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 18:23:48,929 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 137 [2021-05-02 18:23:48,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:48,933 INFO L225 Difference]: With dead ends: 2134 [2021-05-02 18:23:48,933 INFO L226 Difference]: Without dead ends: 2134 [2021-05-02 18:23:48,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1110 ImplicationChecksByTransitivity, 893.5ms TimeCoverageRelationStatistics Valid=1224, Invalid=4032, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 18:23:48,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-05-02 18:23:48,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1462. [2021-05-02 18:23:48,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1462 states, 1421 states have (on average 1.1822660098522169) internal successors, (1680), 1432 states have internal predecessors, (1680), 23 states have call successors, (23), 18 states have call predecessors, (23), 17 states have return successors, (22), 11 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 18:23:48,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1462 states to 1462 states and 1725 transitions. [2021-05-02 18:23:48,955 INFO L78 Accepts]: Start accepts. Automaton has 1462 states and 1725 transitions. Word has length 137 [2021-05-02 18:23:48,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:48,956 INFO L480 AbstractCegarLoop]: Abstraction has 1462 states and 1725 transitions. [2021-05-02 18:23:48,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:48,956 INFO L276 IsEmpty]: Start isEmpty. Operand 1462 states and 1725 transitions. [2021-05-02 18:23:48,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 18:23:48,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:48,957 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 38, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:49,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:23:49,173 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:49,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:49,173 INFO L82 PathProgramCache]: Analyzing trace with hash 525571302, now seen corresponding path program 10 times [2021-05-02 18:23:49,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:49,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200488123] [2021-05-02 18:23:49,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:49,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-02 18:23:49,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2427 backedges. 1244 proven. 590 refuted. 0 times theorem prover too weak. 593 trivial. 0 not checked. [2021-05-02 18:23:49,372 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:49,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200488123] [2021-05-02 18:23:49,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200488123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:49,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854088895] [2021-05-02 18:23:49,373 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 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 18:23:49,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:49,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:49,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:23:49,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:49,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2427 backedges. 1282 proven. 0 refuted. 0 times theorem prover too weak. 1145 trivial. 0 not checked. [2021-05-02 18:23:49,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854088895] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:49,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:49,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [24] total 26 [2021-05-02 18:23:49,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95961978] [2021-05-02 18:23:49,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:49,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:49,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:49,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:23:49,556 INFO L87 Difference]: Start difference. First operand 1462 states and 1725 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:49,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:49,580 INFO L93 Difference]: Finished difference Result 1713 states and 1920 transitions. [2021-05-02 18:23:49,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:49,580 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 143 [2021-05-02 18:23:49,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:49,584 INFO L225 Difference]: With dead ends: 1713 [2021-05-02 18:23:49,584 INFO L226 Difference]: Without dead ends: 1710 [2021-05-02 18:23:49,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 185.8ms TimeCoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:23:49,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1710 states. [2021-05-02 18:23:49,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1710 to 1224. [2021-05-02 18:23:49,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1224 states, 1195 states have (on average 1.1715481171548117) internal successors, (1400), 1200 states have internal predecessors, (1400), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:49,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1224 states to 1224 states and 1429 transitions. [2021-05-02 18:23:49,601 INFO L78 Accepts]: Start accepts. Automaton has 1224 states and 1429 transitions. Word has length 143 [2021-05-02 18:23:49,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:49,602 INFO L480 AbstractCegarLoop]: Abstraction has 1224 states and 1429 transitions. [2021-05-02 18:23:49,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:23:49,602 INFO L276 IsEmpty]: Start isEmpty. Operand 1224 states and 1429 transitions. [2021-05-02 18:23:49,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 18:23:49,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:49,603 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 39, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:49,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:23:49,817 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:49,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:49,817 INFO L82 PathProgramCache]: Analyzing trace with hash 149462165, now seen corresponding path program 1 times [2021-05-02 18:23:49,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:49,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066938014] [2021-05-02 18:23:49,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:49,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-02 18:23:50,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2549 backedges. 1305 proven. 590 refuted. 0 times theorem prover too weak. 654 trivial. 0 not checked. [2021-05-02 18:23:50,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066938014] [2021-05-02 18:23:50,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066938014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834761940] [2021-05-02 18:23:50,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:50,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:50,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:50,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2549 backedges. 1303 proven. 590 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2021-05-02 18:23:50,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834761940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:50,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:23:50,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800351864] [2021-05-02 18:23:50,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:23:50,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:50,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:23:50,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:23:50,247 INFO L87 Difference]: Start difference. First operand 1224 states and 1429 transitions. Second operand has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:50,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:50,391 INFO L93 Difference]: Finished difference Result 1946 states and 2168 transitions. [2021-05-02 18:23:50,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:23:50,393 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 146 [2021-05-02 18:23:50,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:50,396 INFO L225 Difference]: With dead ends: 1946 [2021-05-02 18:23:50,397 INFO L226 Difference]: Without dead ends: 1946 [2021-05-02 18:23:50,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 179.3ms TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:23:50,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1946 states. [2021-05-02 18:23:50,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1946 to 1275. [2021-05-02 18:23:50,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1275 states, 1246 states have (on average 1.1709470304975922) internal successors, (1459), 1251 states have internal predecessors, (1459), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:50,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1275 states to 1275 states and 1488 transitions. [2021-05-02 18:23:50,415 INFO L78 Accepts]: Start accepts. Automaton has 1275 states and 1488 transitions. Word has length 146 [2021-05-02 18:23:50,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:50,415 INFO L480 AbstractCegarLoop]: Abstraction has 1275 states and 1488 transitions. [2021-05-02 18:23:50,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:50,415 INFO L276 IsEmpty]: Start isEmpty. Operand 1275 states and 1488 transitions. [2021-05-02 18:23:50,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:23:50,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,416 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 40, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:50,630 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,630 INFO L82 PathProgramCache]: Analyzing trace with hash -2131082013, now seen corresponding path program 2 times [2021-05-02 18:23:50,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711405968] [2021-05-02 18:23:50,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-02 18:23:50,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2674 backedges. 1369 proven. 651 refuted. 0 times theorem prover too weak. 654 trivial. 0 not checked. [2021-05-02 18:23:50,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711405968] [2021-05-02 18:23:50,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711405968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774183099] [2021-05-02 18:23:50,846 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 18:23:50,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:50,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:50,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 18:23:50,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:50,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2674 backedges. 6 proven. 1974 refuted. 0 times theorem prover too weak. 694 trivial. 0 not checked. [2021-05-02 18:23:51,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774183099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:51,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 28 [2021-05-02 18:23:51,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309084534] [2021-05-02 18:23:51,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:23:51,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:51,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:23:51,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=449, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:23:51,138 INFO L87 Difference]: Start difference. First operand 1275 states and 1488 transitions. Second operand has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:51,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:51,628 INFO L93 Difference]: Finished difference Result 2265 states and 2575 transitions. [2021-05-02 18:23:51,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:23:51,629 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 149 [2021-05-02 18:23:51,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:51,633 INFO L225 Difference]: With dead ends: 2265 [2021-05-02 18:23:51,633 INFO L226 Difference]: Without dead ends: 2265 [2021-05-02 18:23:51,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 462.2ms TimeCoverageRelationStatistics Valid=862, Invalid=1688, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:23:51,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2265 states. [2021-05-02 18:23:51,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2265 to 1315. [2021-05-02 18:23:51,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1315 states, 1286 states have (on average 1.1726283048211508) internal successors, (1508), 1291 states have internal predecessors, (1508), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:51,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1315 states to 1315 states and 1537 transitions. [2021-05-02 18:23:51,665 INFO L78 Accepts]: Start accepts. Automaton has 1315 states and 1537 transitions. Word has length 149 [2021-05-02 18:23:51,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:51,665 INFO L480 AbstractCegarLoop]: Abstraction has 1315 states and 1537 transitions. [2021-05-02 18:23:51,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:51,666 INFO L276 IsEmpty]: Start isEmpty. Operand 1315 states and 1537 transitions. [2021-05-02 18:23:51,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 18:23:51,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:51,668 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 42, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:51,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:23:51,881 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:51,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:51,881 INFO L82 PathProgramCache]: Analyzing trace with hash -2099407131, now seen corresponding path program 3 times [2021-05-02 18:23:51,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:51,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651413228] [2021-05-02 18:23:51,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:51,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:52,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2021-05-02 18:23:52,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2933 backedges. 1500 proven. 715 refuted. 0 times theorem prover too weak. 718 trivial. 0 not checked. [2021-05-02 18:23:52,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:52,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651413228] [2021-05-02 18:23:52,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651413228] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437366549] [2021-05-02 18:23:52,117 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 18:23:52,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:23:52,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:52,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:23:52,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:52,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2933 backedges. 1 proven. 1502 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2021-05-02 18:23:52,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437366549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:52,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10] total 34 [2021-05-02 18:23:52,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251214247] [2021-05-02 18:23:52,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:23:52,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:52,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:23:52,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=803, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:23:52,488 INFO L87 Difference]: Start difference. First operand 1315 states and 1537 transitions. Second operand has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:53,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:53,655 INFO L93 Difference]: Finished difference Result 1918 states and 2135 transitions. [2021-05-02 18:23:53,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-02 18:23:53,656 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 155 [2021-05-02 18:23:53,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:53,660 INFO L225 Difference]: With dead ends: 1918 [2021-05-02 18:23:53,660 INFO L226 Difference]: Without dead ends: 1918 [2021-05-02 18:23:53,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1518 ImplicationChecksByTransitivity, 1153.6ms TimeCoverageRelationStatistics Valid=1544, Invalid=5596, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 18:23:53,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1918 states. [2021-05-02 18:23:53,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1918 to 1254. [2021-05-02 18:23:53,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1254 states, 1225 states have (on average 1.1706122448979592) internal successors, (1434), 1230 states have internal predecessors, (1434), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:53,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1254 states to 1254 states and 1463 transitions. [2021-05-02 18:23:53,675 INFO L78 Accepts]: Start accepts. Automaton has 1254 states and 1463 transitions. Word has length 155 [2021-05-02 18:23:53,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:53,675 INFO L480 AbstractCegarLoop]: Abstraction has 1254 states and 1463 transitions. [2021-05-02 18:23:53,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:53,675 INFO L276 IsEmpty]: Start isEmpty. Operand 1254 states and 1463 transitions. [2021-05-02 18:23:53,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-05-02 18:23:53,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:53,677 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 66, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:53,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:53,897 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:53,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:53,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1642444911, now seen corresponding path program 4 times [2021-05-02 18:23:53,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:53,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601583895] [2021-05-02 18:23:53,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:53,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:54,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-02 18:23:54,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-02 18:23:54,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,159 INFO L134 CoverageAnalysis]: Checked inductivity of 7268 backedges. 3274 proven. 782 refuted. 0 times theorem prover too weak. 3212 trivial. 0 not checked. [2021-05-02 18:23:54,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:54,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601583895] [2021-05-02 18:23:54,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601583895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304338540] [2021-05-02 18:23:54,159 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:54,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:54,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:54,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:23:54,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:54,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,474 INFO L134 CoverageAnalysis]: Checked inductivity of 7268 backedges. 3270 proven. 782 refuted. 0 times theorem prover too weak. 3216 trivial. 0 not checked. [2021-05-02 18:23:54,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304338540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:54,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:23:54,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190063512] [2021-05-02 18:23:54,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:23:54,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:54,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:23:54,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:23:54,476 INFO L87 Difference]: Start difference. First operand 1254 states and 1463 transitions. Second operand has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:54,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:54,612 INFO L93 Difference]: Finished difference Result 1974 states and 2200 transitions. [2021-05-02 18:23:54,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:23:54,613 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 239 [2021-05-02 18:23:54,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:54,621 INFO L225 Difference]: With dead ends: 1974 [2021-05-02 18:23:54,621 INFO L226 Difference]: Without dead ends: 1974 [2021-05-02 18:23:54,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 215.4ms TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:23:54,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-05-02 18:23:54,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1307. [2021-05-02 18:23:54,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1307 states, 1278 states have (on average 1.1697965571205007) internal successors, (1495), 1283 states have internal predecessors, (1495), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 18:23:54,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1307 states to 1307 states and 1524 transitions. [2021-05-02 18:23:54,634 INFO L78 Accepts]: Start accepts. Automaton has 1307 states and 1524 transitions. Word has length 239 [2021-05-02 18:23:54,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:54,634 INFO L480 AbstractCegarLoop]: Abstraction has 1307 states and 1524 transitions. [2021-05-02 18:23:54,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:23:54,634 INFO L276 IsEmpty]: Start isEmpty. Operand 1307 states and 1524 transitions. [2021-05-02 18:23:54,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-05-02 18:23:54,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:54,637 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 69, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:54,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:23:54,852 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:54,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:54,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1172479655, now seen corresponding path program 5 times [2021-05-02 18:23:54,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:54,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483803692] [2021-05-02 18:23:54,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:54,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:55,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 18:23:55,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163 [2021-05-02 18:23:55,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7907 backedges. 3560 proven. 852 refuted. 0 times theorem prover too weak. 3495 trivial. 0 not checked. [2021-05-02 18:23:55,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:55,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483803692] [2021-05-02 18:23:55,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483803692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153949062] [2021-05-02 18:23:55,133 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:55,215 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 47 check-sat command(s) [2021-05-02 18:23:55,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:55,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:23:55,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:55,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,995 INFO L134 CoverageAnalysis]: Checked inductivity of 7907 backedges. 3712 proven. 805 refuted. 0 times theorem prover too weak. 3390 trivial. 0 not checked. [2021-05-02 18:23:55,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153949062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:55,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 55 [2021-05-02 18:23:55,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4303700] [2021-05-02 18:23:55,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:23:55,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:55,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:23:55,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=757, Invalid=2213, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:23:55,997 INFO L87 Difference]: Start difference. First operand 1307 states and 1524 transitions. Second operand has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 18:24:06,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:06,181 INFO L93 Difference]: Finished difference Result 7329 states and 8254 transitions. [2021-05-02 18:24:06,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 429 states. [2021-05-02 18:24:06,181 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 248 [2021-05-02 18:24:06,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:06,199 INFO L225 Difference]: With dead ends: 7329 [2021-05-02 18:24:06,199 INFO L226 Difference]: Without dead ends: 7329 [2021-05-02 18:24:06,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1006 GetRequests, 577 SyntacticMatches, 0 SemanticMatches, 429 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97417 ImplicationChecksByTransitivity, 8751.1ms TimeCoverageRelationStatistics Valid=56110, Invalid=129220, Unknown=0, NotChecked=0, Total=185330 [2021-05-02 18:24:06,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7329 states. [2021-05-02 18:24:06,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7329 to 5087. [2021-05-02 18:24:06,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5087 states, 5052 states have (on average 1.051464766429137) internal successors, (5312), 5058 states have internal predecessors, (5312), 18 states have call successors, (18), 17 states have call predecessors, (18), 16 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 18:24:06,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5087 states to 5087 states and 5347 transitions. [2021-05-02 18:24:06,264 INFO L78 Accepts]: Start accepts. Automaton has 5087 states and 5347 transitions. Word has length 248 [2021-05-02 18:24:06,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:06,264 INFO L480 AbstractCegarLoop]: Abstraction has 5087 states and 5347 transitions. [2021-05-02 18:24:06,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 18:24:06,264 INFO L276 IsEmpty]: Start isEmpty. Operand 5087 states and 5347 transitions. [2021-05-02 18:24:06,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-02 18:24:06,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:06,271 INFO L523 BasicCegarLoop]: trace histogram [75, 75, 72, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:06,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:06,485 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:06,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:06,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1316628625, now seen corresponding path program 6 times [2021-05-02 18:24:06,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:06,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799407147] [2021-05-02 18:24:06,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:06,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:06,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-02 18:24:06,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169 [2021-05-02 18:24:06,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,810 INFO L134 CoverageAnalysis]: Checked inductivity of 8573 backedges. 3858 proven. 925 refuted. 0 times theorem prover too weak. 3790 trivial. 0 not checked. [2021-05-02 18:24:06,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:06,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799407147] [2021-05-02 18:24:06,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799407147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:06,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964236273] [2021-05-02 18:24:06,810 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 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 18:24:06,852 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 18:24:06,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:06,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:24:06,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:07,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,222 INFO L134 CoverageAnalysis]: Checked inductivity of 8573 backedges. 3939 proven. 1 refuted. 0 times theorem prover too weak. 4633 trivial. 0 not checked. [2021-05-02 18:24:07,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964236273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:07,223 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:07,223 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 37 [2021-05-02 18:24:07,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931135708] [2021-05-02 18:24:07,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 18:24:07,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:07,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 18:24:07,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=930, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:24:07,224 INFO L87 Difference]: Start difference. First operand 5087 states and 5347 transitions. Second operand has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:24:07,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:07,901 INFO L93 Difference]: Finished difference Result 6051 states and 6317 transitions. [2021-05-02 18:24:07,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:24:07,901 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 257 [2021-05-02 18:24:07,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:07,902 INFO L225 Difference]: With dead ends: 6051 [2021-05-02 18:24:07,902 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:24:07,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 644 ImplicationChecksByTransitivity, 890.6ms TimeCoverageRelationStatistics Valid=1221, Invalid=2939, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:24:07,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:24:07,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:24:07,904 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 18:24:07,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:24:07,905 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 257 [2021-05-02 18:24:07,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:07,905 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:24:07,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:24:07,905 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:24:07,905 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:24:08,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:24:08,116 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:24:08 BasicIcfg [2021-05-02 18:24:08,116 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:24:08,117 INFO L168 Benchmark]: Toolchain (without parser) took 37947.27 ms. Allocated memory was 194.0 MB in the beginning and 608.2 MB in the end (delta: 414.2 MB). Free memory was 158.6 MB in the beginning and 390.7 MB in the end (delta: -232.0 MB). Peak memory consumption was 182.8 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 194.0 MB. Free memory is still 175.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: CACSL2BoogieTranslator took 200.27 ms. Allocated memory is still 194.0 MB. Free memory was 158.5 MB in the beginning and 178.2 MB in the end (delta: -19.7 MB). Peak memory consumption was 16.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: Boogie Preprocessor took 64.40 ms. Allocated memory is still 194.0 MB. Free memory was 178.2 MB in the beginning and 177.4 MB in the end (delta: 771.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: RCFGBuilder took 211.01 ms. Allocated memory is still 194.0 MB. Free memory was 177.4 MB in the beginning and 162.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: IcfgTransformer took 13.12 ms. Allocated memory is still 194.0 MB. Free memory was 162.7 MB in the beginning and 161.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L168 Benchmark]: TraceAbstraction took 37451.03 ms. Allocated memory was 194.0 MB in the beginning and 608.2 MB in the end (delta: 414.2 MB). Free memory was 161.2 MB in the beginning and 390.7 MB in the end (delta: -229.5 MB). Peak memory consumption was 184.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:24:08,117 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 194.0 MB. Free memory is still 175.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 200.27 ms. Allocated memory is still 194.0 MB. Free memory was 158.5 MB in the beginning and 178.2 MB in the end (delta: -19.7 MB). Peak memory consumption was 16.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 64.40 ms. Allocated memory is still 194.0 MB. Free memory was 178.2 MB in the beginning and 177.4 MB in the end (delta: 771.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 211.01 ms. Allocated memory is still 194.0 MB. Free memory was 177.4 MB in the beginning and 162.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 13.12 ms. Allocated memory is still 194.0 MB. Free memory was 162.7 MB in the beginning and 161.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 37451.03 ms. Allocated memory was 194.0 MB in the beginning and 608.2 MB in the end (delta: 414.2 MB). Free memory was 161.2 MB in the beginning and 390.7 MB in the end (delta: -229.5 MB). Peak memory consumption was 184.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: 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 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 37401.0ms, OverallIterations: 33, TraceHistogramMax: 75, EmptinessCheckTime: 47.0ms, AutomataDifference: 19285.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 654 SDtfs, 2531 SDslu, 2558 SDs, 0 SdLazy, 10423 SolverSat, 619 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3860.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4534 GetRequests, 3276 SyntacticMatches, 0 SemanticMatches, 1258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111509 ImplicationChecksByTransitivity, 17643.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=5087occurred in iteration=32, InterpolantAutomatonStates: 1171, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 398.7ms AutomataMinimizationTime, 33 MinimizatonAttempts, 10685 StatesRemovedByMinimization, 32 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 301.8ms SsaConstructionTime, 908.5ms SatisfiabilityAnalysisTime, 8964.8ms InterpolantComputationTime, 5894 NumberOfCodeBlocks, 5112 NumberOfCodeBlocksAsserted, 165 NumberOfCheckSat, 5830 ConstructedInterpolants, 0 QuantifiedInterpolants, 14170 SizeOfPredicates, 39 NumberOfNonLiveVariables, 5938 ConjunctsInSsa, 411 ConjunctsInUnsatCore, 64 InterpolantComputations, 9 PerfectInterpolantSequences, 80433/98918 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...