/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:36:00,148 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:36:00,150 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:36:00,183 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:36:00,229 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 06:36:00,230 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 06:36:00,231 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 06:36:00,237 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:36:00,249 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:36:00,250 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:36:00,252 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:36:00,252 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:36:00,253 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:36:00,253 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:36:00,253 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:36:00,253 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:36:00,254 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:36:00,254 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:36:00,254 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:36:00,254 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:36:00,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:36:00,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:36:00,254 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:36:00,255 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:36:00,255 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:36:00,510 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:36:00,526 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:36:00,527 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:36:00,528 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:36:00,529 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:36:00,529 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-06 06:36:00,574 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53c41c104/a087442fe1a5488d9e2538497198a50a/FLAG099024d43 [2021-05-06 06:36:00,956 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:36:00,957 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-06 06:36:00,961 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53c41c104/a087442fe1a5488d9e2538497198a50a/FLAG099024d43 [2021-05-06 06:36:00,975 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53c41c104/a087442fe1a5488d9e2538497198a50a [2021-05-06 06:36:00,977 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:36:00,978 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:36:00,982 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:36:00,983 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:36:00,985 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:36:00,986 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:36:00" (1/1) ... [2021-05-06 06:36:00,987 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ca6f972 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:00, skipping insertion in model container [2021-05-06 06:36:00,987 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:36:00" (1/1) ... [2021-05-06 06:36:00,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:36:01,001 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:36:01,115 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c[321,334] [2021-05-06 06:36:01,131 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:36:01,136 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:36:01,151 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c[321,334] [2021-05-06 06:36:01,173 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:36:01,184 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:36:01,184 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01 WrapperNode [2021-05-06 06:36:01,185 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:36:01,187 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:36:01,187 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:36:01,187 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:36:01,196 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,201 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,201 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,210 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,215 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,218 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,222 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:36:01,223 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:36:01,224 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:36:01,224 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:36:01,224 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:36:01,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:36:01,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:36:01,291 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:36:01,292 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:36:01,292 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:36:01,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:36:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:36:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:36:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:36:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:36:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:36:01,490 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:36:01,491 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-06 06:36:01,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:36:01 BoogieIcfgContainer [2021-05-06 06:36:01,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:36:01,492 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:36:01,492 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:36:01,493 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:36:01,495 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:36:01" (1/1) ... [2021-05-06 06:36:01,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:36:01 BasicIcfg [2021-05-06 06:36:01,504 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:36:01,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:36:01,505 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:36:01,507 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:36:01,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:36:00" (1/4) ... [2021-05-06 06:36:01,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ceb716a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:36:01, skipping insertion in model container [2021-05-06 06:36:01,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:36:01" (2/4) ... [2021-05-06 06:36:01,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ceb716a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:36:01, skipping insertion in model container [2021-05-06 06:36:01,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:36:01" (3/4) ... [2021-05-06 06:36:01,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ceb716a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:36:01, skipping insertion in model container [2021-05-06 06:36:01,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:36:01" (4/4) ... [2021-05-06 06:36:01,522 INFO L111 eAbstractionObserver]: Analyzing ICFG nested5-2.cJordan [2021-05-06 06:36:01,527 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:36:01,530 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:36:01,544 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:36:01,572 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:36:01,572 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:36:01,572 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:36:01,572 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:36:01,572 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:36:01,572 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:36:01,573 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:36:01,573 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:36:01,590 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 06:36:01,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:36:01,594 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:01,595 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:01,595 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:01,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:01,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1895308246, now seen corresponding path program 1 times [2021-05-06 06:36:01,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:01,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121574118] [2021-05-06 06:36:01,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:01,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:01,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:01,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:01,782 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:01,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121574118] [2021-05-06 06:36:01,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121574118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:36:01,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:36:01,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:36:01,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251649766] [2021-05-06 06:36:01,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:36:01,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:01,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:36:01,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:36:01,796 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:01,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:01,823 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-06 06:36:01,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:36:01,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 15 [2021-05-06 06:36:01,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:01,828 INFO L225 Difference]: With dead ends: 28 [2021-05-06 06:36:01,828 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 06:36:01,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:36:01,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 06:36:01,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 06:36:01,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 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) [2021-05-06 06:36:01,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-06 06:36:01,849 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2021-05-06 06:36:01,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:01,849 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-06 06:36:01,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:01,849 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-06 06:36:01,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:36:01,850 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:01,850 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:01,850 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:36:01,850 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:01,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:01,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1894384725, now seen corresponding path program 1 times [2021-05-06 06:36:01,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:01,851 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357252032] [2021-05-06 06:36:01,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:01,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:01,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:01,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:01,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:01,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:01,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357252032] [2021-05-06 06:36:01,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357252032] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:36:01,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:36:01,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 06:36:01,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823735386] [2021-05-06 06:36:01,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 06:36:01,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:01,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 06:36:01,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 06:36:01,937 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:01,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:01,998 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-05-06 06:36:01,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 06:36:01,999 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 15 [2021-05-06 06:36:01,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:02,000 INFO L225 Difference]: With dead ends: 32 [2021-05-06 06:36:02,000 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 06:36:02,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 06:36:02,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 06:36:02,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-05-06 06:36:02,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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) [2021-05-06 06:36:02,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-06 06:36:02,003 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 15 [2021-05-06 06:36:02,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:02,004 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-06 06:36:02,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:02,004 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-06 06:36:02,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 06:36:02,004 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:02,004 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:02,004 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 06:36:02,005 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:02,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:02,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1473809801, now seen corresponding path program 1 times [2021-05-06 06:36:02,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:02,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116508803] [2021-05-06 06:36:02,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:02,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:02,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:02,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:02,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:02,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:02,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116508803] [2021-05-06 06:36:02,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116508803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:02,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212554831] [2021-05-06 06:36:02,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:02,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:02,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 06:36:02,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:02,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:02,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212554831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:02,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:02,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 06:36:02,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366269528] [2021-05-06 06:36:02,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 06:36:02,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:02,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 06:36:02,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 06:36:02,284 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:02,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:02,401 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-05-06 06:36:02,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 06:36:02,401 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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 [2021-05-06 06:36:02,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:02,402 INFO L225 Difference]: With dead ends: 34 [2021-05-06 06:36:02,402 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 06:36:02,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 90.0ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:36:02,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 06:36:02,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-05-06 06:36:02,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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) [2021-05-06 06:36:02,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 06:36:02,405 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-05-06 06:36:02,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:02,405 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 06:36:02,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:02,405 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 06:36:02,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 06:36:02,406 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:02,406 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:02,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 06:36:02,621 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:02,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:02,621 INFO L82 PathProgramCache]: Analyzing trace with hash -96591897, now seen corresponding path program 2 times [2021-05-06 06:36:02,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:02,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021796009] [2021-05-06 06:36:02,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:02,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:02,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:02,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:02,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:02,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021796009] [2021-05-06 06:36:02,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021796009] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:02,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790147917] [2021-05-06 06:36:02,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:02,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:02,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:02,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 06:36:02,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:02,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:02,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:02,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790147917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:02,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:02,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 06:36:02,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971676263] [2021-05-06 06:36:02,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 06:36:02,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:02,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 06:36:02,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 06:36:02,857 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:03,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:03,027 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-05-06 06:36:03,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 06:36:03,027 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 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 19 [2021-05-06 06:36:03,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:03,028 INFO L225 Difference]: With dead ends: 36 [2021-05-06 06:36:03,029 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 06:36:03,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 127.3ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:36:03,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 06:36:03,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2021-05-06 06:36:03,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 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) [2021-05-06 06:36:03,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-06 06:36:03,040 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2021-05-06 06:36:03,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:03,040 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-06 06:36:03,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:03,040 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-06 06:36:03,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 06:36:03,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:03,041 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:03,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:03,245 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:03,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:03,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1719102779, now seen corresponding path program 3 times [2021-05-06 06:36:03,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:03,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333529091] [2021-05-06 06:36:03,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:03,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:03,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:03,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:03,337 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:03,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:03,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333529091] [2021-05-06 06:36:03,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333529091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:03,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314566763] [2021-05-06 06:36:03,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:03,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 06:36:03,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:03,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 06:36:03,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:03,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:03,481 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:03,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314566763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:03,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:03,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-06 06:36:03,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5028906] [2021-05-06 06:36:03,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 06:36:03,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:03,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 06:36:03,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:36:03,487 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:03,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:03,662 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2021-05-06 06:36:03,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 06:36:03,663 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 06:36:03,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:03,663 INFO L225 Difference]: With dead ends: 38 [2021-05-06 06:36:03,663 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 06:36:03,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 139.1ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:36:03,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 06:36:03,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-05-06 06:36:03,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 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) [2021-05-06 06:36:03,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-06 06:36:03,666 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 21 [2021-05-06 06:36:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:03,666 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-06 06:36:03,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:03,666 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-06 06:36:03,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 06:36:03,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:03,669 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:03,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:03,881 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:03,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:03,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1878931933, now seen corresponding path program 4 times [2021-05-06 06:36:03,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:03,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569443339] [2021-05-06 06:36:03,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:03,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:03,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:03,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:03,968 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:03,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:03,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569443339] [2021-05-06 06:36:03,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569443339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:03,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600086663] [2021-05-06 06:36:03,970 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:04,013 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:36:04,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:04,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 06:36:04,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:04,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:04,070 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:04,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600086663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:04,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:04,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-06 06:36:04,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771652840] [2021-05-06 06:36:04,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 06:36:04,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:04,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 06:36:04,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:36:04,074 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:04,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:04,283 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-06 06:36:04,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 06:36:04,283 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 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 [2021-05-06 06:36:04,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:04,284 INFO L225 Difference]: With dead ends: 40 [2021-05-06 06:36:04,284 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 06:36:04,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 149.9ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:36:04,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 06:36:04,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2021-05-06 06:36:04,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 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) [2021-05-06 06:36:04,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-06 06:36:04,286 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2021-05-06 06:36:04,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:04,286 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-06 06:36:04,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:04,287 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-06 06:36:04,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 06:36:04,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:04,287 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:04,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:04,497 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:04,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:04,497 INFO L82 PathProgramCache]: Analyzing trace with hash -855926271, now seen corresponding path program 5 times [2021-05-06 06:36:04,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:04,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189705441] [2021-05-06 06:36:04,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:04,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:04,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:04,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:04,573 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:04,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:04,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189705441] [2021-05-06 06:36:04,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189705441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:04,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470808286] [2021-05-06 06:36:04,573 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:04,624 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 06:36:04,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:04,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 06:36:04,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:04,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:04,704 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:04,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470808286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:04,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:04,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 06:36:04,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100633470] [2021-05-06 06:36:04,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 06:36:04,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:04,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 06:36:04,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:36:04,706 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:04,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:04,956 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-05-06 06:36:04,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 06:36:04,957 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 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 25 [2021-05-06 06:36:04,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:04,957 INFO L225 Difference]: With dead ends: 42 [2021-05-06 06:36:04,957 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 06:36:04,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 169.4ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-06 06:36:04,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 06:36:04,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2021-05-06 06:36:04,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 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) [2021-05-06 06:36:04,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-06 06:36:04,960 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 25 [2021-05-06 06:36:04,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:04,960 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-06 06:36:04,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:04,960 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-06 06:36:04,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 06:36:04,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:04,961 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:05,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 06:36:05,173 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:05,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:05,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1294995873, now seen corresponding path program 6 times [2021-05-06 06:36:05,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:05,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278764917] [2021-05-06 06:36:05,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:05,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:05,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:05,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:05,309 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:05,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:05,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278764917] [2021-05-06 06:36:05,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278764917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:05,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359476575] [2021-05-06 06:36:05,309 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:05,387 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 06:36:05,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:05,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 06:36:05,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:05,463 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:05,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359476575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:05,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:05,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 06:36:05,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395665419] [2021-05-06 06:36:05,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 06:36:05,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:05,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 06:36:05,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 06:36:05,466 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:05,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:05,728 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2021-05-06 06:36:05,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 06:36:05,729 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 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 27 [2021-05-06 06:36:05,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:05,729 INFO L225 Difference]: With dead ends: 44 [2021-05-06 06:36:05,729 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 06:36:05,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 204.6ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:36:05,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 06:36:05,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-06 06:36:05,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 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) [2021-05-06 06:36:05,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-06 06:36:05,732 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-05-06 06:36:05,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:05,732 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-06 06:36:05,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:05,732 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-06 06:36:05,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 06:36:05,732 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:05,733 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:05,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:05,950 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:05,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:05,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1960878909, now seen corresponding path program 7 times [2021-05-06 06:36:05,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:05,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262772782] [2021-05-06 06:36:05,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:05,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:06,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:06,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:06,034 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:06,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:06,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262772782] [2021-05-06 06:36:06,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262772782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:06,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181083436] [2021-05-06 06:36:06,034 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:06,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:06,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 06:36:06,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:06,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:06,138 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:06,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181083436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:06,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:06,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 06:36:06,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160812157] [2021-05-06 06:36:06,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 06:36:06,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:06,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 06:36:06,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:36:06,141 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:06,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:06,430 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2021-05-06 06:36:06,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 06:36:06,430 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 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 [2021-05-06 06:36:06,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:06,430 INFO L225 Difference]: With dead ends: 46 [2021-05-06 06:36:06,431 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 06:36:06,431 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 208.5ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:36:06,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 06:36:06,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-05-06 06:36:06,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.15625) internal successors, (37), 32 states have internal predecessors, (37), 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) [2021-05-06 06:36:06,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-06 06:36:06,433 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2021-05-06 06:36:06,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:06,433 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-06 06:36:06,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:06,433 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-06 06:36:06,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 06:36:06,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:06,434 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:06,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:06,635 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:06,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:06,635 INFO L82 PathProgramCache]: Analyzing trace with hash -174614373, now seen corresponding path program 8 times [2021-05-06 06:36:06,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:06,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906111393] [2021-05-06 06:36:06,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:06,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:06,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:06,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:06,772 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:06,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:06,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906111393] [2021-05-06 06:36:06,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906111393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:06,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532769996] [2021-05-06 06:36:06,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:06,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:06,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:06,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 06:36:06,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:06,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:06,911 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:06,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532769996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:06,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:06,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-06 06:36:06,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763158324] [2021-05-06 06:36:06,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 06:36:06,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:06,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 06:36:06,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 06:36:06,913 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:07,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:07,236 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-05-06 06:36:07,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 06:36:07,237 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 06:36:07,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:07,237 INFO L225 Difference]: With dead ends: 48 [2021-05-06 06:36:07,237 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 06:36:07,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 265.0ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 06:36:07,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 06:36:07,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-06 06:36:07,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 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) [2021-05-06 06:36:07,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-05-06 06:36:07,240 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 31 [2021-05-06 06:36:07,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:07,240 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-05-06 06:36:07,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:07,240 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-05-06 06:36:07,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 06:36:07,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:07,241 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:07,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 06:36:07,445 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:07,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:07,445 INFO L82 PathProgramCache]: Analyzing trace with hash 610709113, now seen corresponding path program 9 times [2021-05-06 06:36:07,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:07,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176419384] [2021-05-06 06:36:07,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:07,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:07,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:07,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:07,577 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:07,577 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:07,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176419384] [2021-05-06 06:36:07,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176419384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:07,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422009085] [2021-05-06 06:36:07,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:07,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 06:36:07,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:07,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 06:36:07,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:07,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:07,742 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:07,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422009085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:07,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:07,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 06:36:07,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101610264] [2021-05-06 06:36:07,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 06:36:07,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:07,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 06:36:07,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:36:07,745 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:08,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:08,146 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-05-06 06:36:08,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 06:36:08,147 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 06:36:08,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:08,149 INFO L225 Difference]: With dead ends: 50 [2021-05-06 06:36:08,149 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 06:36:08,149 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 311.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:36:08,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 06:36:08,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-06 06:36:08,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 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) [2021-05-06 06:36:08,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-06 06:36:08,155 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-06 06:36:08,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:08,156 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-06 06:36:08,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:08,156 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-06 06:36:08,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 06:36:08,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:08,158 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:08,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:08,363 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:08,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:08,363 INFO L82 PathProgramCache]: Analyzing trace with hash -607664937, now seen corresponding path program 10 times [2021-05-06 06:36:08,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:08,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770062068] [2021-05-06 06:36:08,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:08,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:08,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:08,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:08,496 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:08,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:08,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770062068] [2021-05-06 06:36:08,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770062068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:08,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261102324] [2021-05-06 06:36:08,497 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:08,536 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:36:08,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:08,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 06:36:08,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:08,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:08,612 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:08,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261102324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:08,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:08,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-06 06:36:08,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074427888] [2021-05-06 06:36:08,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 06:36:08,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:08,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 06:36:08,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 06:36:08,613 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:09,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:09,021 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-06 06:36:09,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 06:36:09,022 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 [2021-05-06 06:36:09,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:09,022 INFO L225 Difference]: With dead ends: 52 [2021-05-06 06:36:09,022 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 06:36:09,023 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 302.6ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:36:09,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 06:36:09,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 44. [2021-05-06 06:36:09,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 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) [2021-05-06 06:36:09,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-06 06:36:09,025 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2021-05-06 06:36:09,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:09,025 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-06 06:36:09,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:09,025 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-06 06:36:09,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 06:36:09,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:09,025 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:09,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:09,226 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:09,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:09,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1060944821, now seen corresponding path program 11 times [2021-05-06 06:36:09,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:09,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145649628] [2021-05-06 06:36:09,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:09,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:09,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:09,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:09,375 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:09,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:09,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145649628] [2021-05-06 06:36:09,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145649628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:09,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291926663] [2021-05-06 06:36:09,376 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:09,476 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 06:36:09,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:09,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 06:36:09,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:09,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:09,601 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:09,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291926663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:09,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:09,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-06 06:36:09,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994599231] [2021-05-06 06:36:09,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 06:36:09,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:09,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 06:36:09,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 06:36:09,603 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:10,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:10,085 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-05-06 06:36:10,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 06:36:10,086 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 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 37 [2021-05-06 06:36:10,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:10,086 INFO L225 Difference]: With dead ends: 54 [2021-05-06 06:36:10,086 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 06:36:10,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 394.8ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 06:36:10,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 06:36:10,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-06 06:36:10,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.125) internal successors, (45), 40 states have internal predecessors, (45), 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) [2021-05-06 06:36:10,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-06 06:36:10,088 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 37 [2021-05-06 06:36:10,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:10,088 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-06 06:36:10,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:10,089 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-06 06:36:10,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 06:36:10,089 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:10,089 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:10,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 06:36:10,305 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:10,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:10,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1722846445, now seen corresponding path program 12 times [2021-05-06 06:36:10,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:10,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910513595] [2021-05-06 06:36:10,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:10,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:10,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:10,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:10,461 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:10,461 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:10,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910513595] [2021-05-06 06:36:10,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910513595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:10,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874251122] [2021-05-06 06:36:10,462 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:10,580 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 06:36:10,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:10,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 06:36:10,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:10,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:10,698 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:10,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874251122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:10,698 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:10,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-06 06:36:10,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664268284] [2021-05-06 06:36:10,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 06:36:10,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:10,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 06:36:10,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 06:36:10,699 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:11,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:11,221 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-06 06:36:11,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 06:36:11,221 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 39 [2021-05-06 06:36:11,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:11,221 INFO L225 Difference]: With dead ends: 56 [2021-05-06 06:36:11,222 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 06:36:11,222 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 445.7ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:36:11,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 06:36:11,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 48. [2021-05-06 06:36:11,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 42 states have (on average 1.119047619047619) internal successors, (47), 42 states have internal predecessors, (47), 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) [2021-05-06 06:36:11,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2021-05-06 06:36:11,224 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2021-05-06 06:36:11,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:11,224 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2021-05-06 06:36:11,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:11,224 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2021-05-06 06:36:11,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 06:36:11,224 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:11,225 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:11,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 06:36:11,429 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:11,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:11,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1181627663, now seen corresponding path program 13 times [2021-05-06 06:36:11,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:11,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910203350] [2021-05-06 06:36:11,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:11,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:11,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:11,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:11,621 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:11,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:11,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910203350] [2021-05-06 06:36:11,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910203350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:11,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835852910] [2021-05-06 06:36:11,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:11,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:11,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 06:36:11,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:11,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:11,723 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:11,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835852910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:11,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:11,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 06:36:11,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596543006] [2021-05-06 06:36:11,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 06:36:11,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:11,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 06:36:11,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:36:11,725 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:12,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:12,303 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-06 06:36:12,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 06:36:12,303 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 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 41 [2021-05-06 06:36:12,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:12,304 INFO L225 Difference]: With dead ends: 58 [2021-05-06 06:36:12,304 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 06:36:12,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 444.0ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:36:12,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 06:36:12,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-05-06 06:36:12,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 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) [2021-05-06 06:36:12,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-06 06:36:12,306 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2021-05-06 06:36:12,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:12,306 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-06 06:36:12,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:12,306 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-06 06:36:12,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 06:36:12,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:12,307 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:12,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 06:36:12,507 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:12,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:12,508 INFO L82 PathProgramCache]: Analyzing trace with hash -761420977, now seen corresponding path program 14 times [2021-05-06 06:36:12,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:12,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238601249] [2021-05-06 06:36:12,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:12,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:12,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:12,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:12,702 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:12,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:12,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238601249] [2021-05-06 06:36:12,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238601249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:12,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478161700] [2021-05-06 06:36:12,703 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:12,762 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:12,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:12,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 06:36:12,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:12,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:12,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478161700] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:12,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:12,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 06:36:12,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270610936] [2021-05-06 06:36:12,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 06:36:12,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:12,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 06:36:12,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 06:36:12,835 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:13,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:13,436 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2021-05-06 06:36:13,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 06:36:13,437 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 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 43 [2021-05-06 06:36:13,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:13,437 INFO L225 Difference]: With dead ends: 60 [2021-05-06 06:36:13,437 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 06:36:13,438 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 446.1ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:36:13,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 06:36:13,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 52. [2021-05-06 06:36:13,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 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) [2021-05-06 06:36:13,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-06 06:36:13,439 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 43 [2021-05-06 06:36:13,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:13,440 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-06 06:36:13,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:13,440 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-06 06:36:13,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 06:36:13,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:13,440 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:13,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:13,641 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:13,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:13,641 INFO L82 PathProgramCache]: Analyzing trace with hash -669721555, now seen corresponding path program 15 times [2021-05-06 06:36:13,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:13,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708170234] [2021-05-06 06:36:13,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:13,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:13,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:13,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:13,851 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:13,851 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:13,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708170234] [2021-05-06 06:36:13,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708170234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:13,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948769548] [2021-05-06 06:36:13,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:14,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-06 06:36:14,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:14,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 06:36:14,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:14,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:14,070 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:14,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948769548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:14,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:14,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 06:36:14,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342320044] [2021-05-06 06:36:14,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 06:36:14,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:14,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 06:36:14,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:36:14,073 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:14,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:14,703 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-05-06 06:36:14,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 06:36:14,703 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 06:36:14,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:14,704 INFO L225 Difference]: With dead ends: 62 [2021-05-06 06:36:14,704 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 06:36:14,704 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 482.3ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 06:36:14,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 06:36:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 54. [2021-05-06 06:36:14,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 states have internal predecessors, (53), 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) [2021-05-06 06:36:14,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-06 06:36:14,706 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2021-05-06 06:36:14,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:14,706 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-06 06:36:14,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:14,706 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-06 06:36:14,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 06:36:14,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:14,707 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:14,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 06:36:14,914 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:14,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:14,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1554077067, now seen corresponding path program 16 times [2021-05-06 06:36:14,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:14,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165177834] [2021-05-06 06:36:14,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:14,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:15,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:15,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:15,113 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:15,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:15,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165177834] [2021-05-06 06:36:15,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165177834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:15,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162802315] [2021-05-06 06:36:15,114 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:15,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:36:15,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:15,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-06 06:36:15,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:15,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:15,215 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:15,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162802315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:15,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:15,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-06 06:36:15,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548905747] [2021-05-06 06:36:15,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 06:36:15,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:15,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 06:36:15,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-06 06:36:15,216 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:15,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:15,876 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2021-05-06 06:36:15,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 06:36:15,877 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 06:36:15,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:15,877 INFO L225 Difference]: With dead ends: 64 [2021-05-06 06:36:15,877 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 06:36:15,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 532.0ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 06:36:15,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 06:36:15,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2021-05-06 06:36:15,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 50 states have (on average 1.1) internal successors, (55), 50 states have internal predecessors, (55), 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) [2021-05-06 06:36:15,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-06 06:36:15,879 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2021-05-06 06:36:15,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:15,880 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-06 06:36:15,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:15,880 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-06 06:36:15,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 06:36:15,880 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:15,880 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:16,085 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 06:36:16,085 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:16,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:16,087 INFO L82 PathProgramCache]: Analyzing trace with hash -269160599, now seen corresponding path program 17 times [2021-05-06 06:36:16,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:16,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312423102] [2021-05-06 06:36:16,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:16,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:16,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:16,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:16,317 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:16,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:16,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312423102] [2021-05-06 06:36:16,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312423102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:16,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493727513] [2021-05-06 06:36:16,317 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:16,597 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-06 06:36:16,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:16,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 06:36:16,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:16,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:16,766 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:16,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493727513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:16,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:16,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-06 06:36:16,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998814053] [2021-05-06 06:36:16,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 06:36:16,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:16,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 06:36:16,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 06:36:16,768 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:17,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:17,472 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2021-05-06 06:36:17,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 06:36:17,472 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 06:36:17,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:17,473 INFO L225 Difference]: With dead ends: 66 [2021-05-06 06:36:17,473 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 06:36:17,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 42 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 660.9ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 06:36:17,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 06:36:17,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2021-05-06 06:36:17,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 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) [2021-05-06 06:36:17,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-06 06:36:17,475 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 49 [2021-05-06 06:36:17,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:17,475 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-06 06:36:17,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:17,475 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-06 06:36:17,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 06:36:17,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:17,476 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:17,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:17,680 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:17,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:17,680 INFO L82 PathProgramCache]: Analyzing trace with hash -53900857, now seen corresponding path program 18 times [2021-05-06 06:36:17,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:17,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205811963] [2021-05-06 06:36:17,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:17,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:17,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:17,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:17,931 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:17,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:17,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205811963] [2021-05-06 06:36:17,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205811963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:17,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546763756] [2021-05-06 06:36:17,932 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:18,165 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-06 06:36:18,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:18,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-06 06:36:18,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:18,245 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:18,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546763756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:18,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:18,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-06 06:36:18,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180080137] [2021-05-06 06:36:18,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 06:36:18,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:18,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 06:36:18,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 06:36:18,246 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:19,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:19,009 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2021-05-06 06:36:19,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 06:36:19,009 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 06:36:19,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:19,009 INFO L225 Difference]: With dead ends: 68 [2021-05-06 06:36:19,009 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 06:36:19,010 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 585.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:36:19,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 06:36:19,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2021-05-06 06:36:19,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 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) [2021-05-06 06:36:19,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-06 06:36:19,012 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 51 [2021-05-06 06:36:19,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:19,012 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-06 06:36:19,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:19,012 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-06 06:36:19,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 06:36:19,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:19,012 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:19,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:19,217 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:19,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:19,217 INFO L82 PathProgramCache]: Analyzing trace with hash 652280997, now seen corresponding path program 19 times [2021-05-06 06:36:19,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:19,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320618016] [2021-05-06 06:36:19,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:19,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:19,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:19,453 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:19,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:19,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320618016] [2021-05-06 06:36:19,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320618016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:19,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129910473] [2021-05-06 06:36:19,453 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:19,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:19,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-06 06:36:19,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:19,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:19,602 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:19,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129910473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:19,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:19,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-06 06:36:19,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947456893] [2021-05-06 06:36:19,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 06:36:19,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:19,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 06:36:19,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:36:19,603 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:20,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:20,403 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2021-05-06 06:36:20,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 06:36:20,404 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 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 53 [2021-05-06 06:36:20,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:20,404 INFO L225 Difference]: With dead ends: 70 [2021-05-06 06:36:20,404 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 06:36:20,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 645.9ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 06:36:20,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 06:36:20,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 62. [2021-05-06 06:36:20,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 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) [2021-05-06 06:36:20,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-05-06 06:36:20,407 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 53 [2021-05-06 06:36:20,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:20,407 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-05-06 06:36:20,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:20,407 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-05-06 06:36:20,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 06:36:20,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:20,408 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:20,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:20,621 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:20,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:20,621 INFO L82 PathProgramCache]: Analyzing trace with hash 688209923, now seen corresponding path program 20 times [2021-05-06 06:36:20,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:20,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430983684] [2021-05-06 06:36:20,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:20,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:20,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:20,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:20,877 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:20,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:20,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430983684] [2021-05-06 06:36:20,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430983684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:20,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639213976] [2021-05-06 06:36:20,878 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:20,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:20,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:20,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-06 06:36:20,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:21,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:21,038 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:21,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639213976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:21,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:21,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-06 06:36:21,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798739816] [2021-05-06 06:36:21,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 06:36:21,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:21,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 06:36:21,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 06:36:21,040 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:21,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:21,922 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2021-05-06 06:36:21,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 06:36:21,923 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 55 [2021-05-06 06:36:21,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:21,923 INFO L225 Difference]: With dead ends: 72 [2021-05-06 06:36:21,923 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 06:36:21,923 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 696.8ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 06:36:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 06:36:21,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 64. [2021-05-06 06:36:21,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 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) [2021-05-06 06:36:21,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-05-06 06:36:21,925 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 55 [2021-05-06 06:36:21,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:21,925 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-05-06 06:36:21,925 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:21,925 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-05-06 06:36:21,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 06:36:21,926 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:21,926 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:22,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 06:36:22,126 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:22,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:22,127 INFO L82 PathProgramCache]: Analyzing trace with hash 856169441, now seen corresponding path program 21 times [2021-05-06 06:36:22,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:22,127 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248422710] [2021-05-06 06:36:22,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:22,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:22,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:22,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:22,420 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:22,420 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:22,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248422710] [2021-05-06 06:36:22,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248422710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:22,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907252407] [2021-05-06 06:36:22,420 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:22,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-06 06:36:22,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:22,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 06:36:22,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:22,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:22,987 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:22,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907252407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:22,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:22,987 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-06 06:36:22,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449721924] [2021-05-06 06:36:22,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 06:36:22,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:22,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 06:36:22,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:36:22,988 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:23,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:23,869 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2021-05-06 06:36:23,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 06:36:23,869 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 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 57 [2021-05-06 06:36:23,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:23,869 INFO L225 Difference]: With dead ends: 74 [2021-05-06 06:36:23,869 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 06:36:23,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 785.8ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 06:36:23,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 06:36:23,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 66. [2021-05-06 06:36:23,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 60 states have internal predecessors, (65), 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) [2021-05-06 06:36:23,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-05-06 06:36:23,871 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 57 [2021-05-06 06:36:23,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:23,871 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-05-06 06:36:23,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:23,872 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-05-06 06:36:23,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 06:36:23,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:23,872 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:24,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 06:36:24,072 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:24,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:24,073 INFO L82 PathProgramCache]: Analyzing trace with hash -943491009, now seen corresponding path program 22 times [2021-05-06 06:36:24,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:24,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811492764] [2021-05-06 06:36:24,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:24,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:24,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:24,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:24,389 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:24,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:24,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811492764] [2021-05-06 06:36:24,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811492764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:24,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753097697] [2021-05-06 06:36:24,389 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:24,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:36:24,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:24,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-06 06:36:24,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:24,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:24,535 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:24,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753097697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:24,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:24,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-06 06:36:24,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363135559] [2021-05-06 06:36:24,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 06:36:24,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:24,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 06:36:24,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-06 06:36:24,536 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:25,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:25,541 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2021-05-06 06:36:25,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 06:36:25,542 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 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 59 [2021-05-06 06:36:25,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:25,542 INFO L225 Difference]: With dead ends: 76 [2021-05-06 06:36:25,542 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 06:36:25,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 809.2ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:36:25,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 06:36:25,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2021-05-06 06:36:25,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 62 states have internal predecessors, (67), 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) [2021-05-06 06:36:25,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-05-06 06:36:25,544 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2021-05-06 06:36:25,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:25,544 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-05-06 06:36:25,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:25,545 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-05-06 06:36:25,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 06:36:25,545 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:25,545 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:25,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:25,751 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:25,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:25,752 INFO L82 PathProgramCache]: Analyzing trace with hash 454636829, now seen corresponding path program 23 times [2021-05-06 06:36:25,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:25,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681159913] [2021-05-06 06:36:25,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:25,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:26,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:26,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:26,089 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:26,089 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:26,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681159913] [2021-05-06 06:36:26,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681159913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:26,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131366556] [2021-05-06 06:36:26,089 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:27,646 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-06 06:36:27,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:27,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-06 06:36:27,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:27,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:27,941 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:27,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131366556] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:27,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:27,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-06 06:36:27,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514963249] [2021-05-06 06:36:27,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 06:36:27,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:27,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 06:36:27,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 06:36:27,942 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:29,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:29,043 INFO L93 Difference]: Finished difference Result 78 states and 85 transitions. [2021-05-06 06:36:29,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 06:36:29,043 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 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 61 [2021-05-06 06:36:29,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:29,044 INFO L225 Difference]: With dead ends: 78 [2021-05-06 06:36:29,044 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 06:36:29,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 42 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1052.9ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 06:36:29,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 06:36:29,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2021-05-06 06:36:29,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 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) [2021-05-06 06:36:29,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-05-06 06:36:29,046 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 61 [2021-05-06 06:36:29,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:29,046 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-05-06 06:36:29,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:29,046 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-05-06 06:36:29,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 06:36:29,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:29,046 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:29,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 06:36:29,251 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:29,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:29,251 INFO L82 PathProgramCache]: Analyzing trace with hash -269274501, now seen corresponding path program 24 times [2021-05-06 06:36:29,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:29,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864711551] [2021-05-06 06:36:29,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:29,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:29,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:29,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:29,570 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:29,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:29,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864711551] [2021-05-06 06:36:29,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864711551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:29,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599582870] [2021-05-06 06:36:29,570 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:30,347 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-06 06:36:30,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:30,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 06:36:30,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:30,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:30,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:30,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:30,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:30,524 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:30,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599582870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:30,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:30,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 31 [2021-05-06 06:36:30,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944807743] [2021-05-06 06:36:30,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 06:36:30,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:30,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 06:36:30,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=846, Unknown=0, NotChecked=0, Total=930 [2021-05-06 06:36:30,527 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:31,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:31,737 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2021-05-06 06:36:31,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 06:36:31,737 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 06:36:31,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:31,738 INFO L225 Difference]: With dead ends: 80 [2021-05-06 06:36:31,738 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 06:36:31,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 984.5ms TimeCoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:36:31,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 06:36:31,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-05-06 06:36:31,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 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) [2021-05-06 06:36:31,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-06 06:36:31,740 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 63 [2021-05-06 06:36:31,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:31,740 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-06 06:36:31,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:31,740 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-06 06:36:31,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 06:36:31,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:31,740 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:31,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:31,945 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:31,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:31,945 INFO L82 PathProgramCache]: Analyzing trace with hash -163360679, now seen corresponding path program 25 times [2021-05-06 06:36:31,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:31,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987914931] [2021-05-06 06:36:31,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:31,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:32,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:32,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:32,338 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:32,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:32,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987914931] [2021-05-06 06:36:32,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987914931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:32,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509212915] [2021-05-06 06:36:32,339 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:32,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:32,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 06:36:32,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:32,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:32,496 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:32,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509212915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:32,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:32,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 06:36:32,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184272126] [2021-05-06 06:36:32,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 06:36:32,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:32,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 06:36:32,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:36:32,498 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:33,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:33,736 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2021-05-06 06:36:33,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 06:36:33,737 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 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 65 [2021-05-06 06:36:33,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:33,737 INFO L225 Difference]: With dead ends: 82 [2021-05-06 06:36:33,737 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 06:36:33,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 963.3ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:36:33,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 06:36:33,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 74. [2021-05-06 06:36:33,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 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) [2021-05-06 06:36:33,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-05-06 06:36:33,744 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 65 [2021-05-06 06:36:33,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:33,744 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-05-06 06:36:33,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:33,744 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-05-06 06:36:33,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 06:36:33,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:33,744 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:33,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 06:36:33,945 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:33,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:33,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1459392841, now seen corresponding path program 26 times [2021-05-06 06:36:33,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:33,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697125795] [2021-05-06 06:36:33,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:33,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:34,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:34,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:34,337 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:34,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:34,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697125795] [2021-05-06 06:36:34,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697125795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:34,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937163464] [2021-05-06 06:36:34,338 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:34,441 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:34,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:34,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-06 06:36:34,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:34,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:34,534 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:34,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937163464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:34,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:34,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-06 06:36:34,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966221751] [2021-05-06 06:36:34,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 06:36:34,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:34,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 06:36:34,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 06:36:34,536 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:35,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:35,878 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2021-05-06 06:36:35,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 06:36:35,878 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 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 67 [2021-05-06 06:36:35,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:35,879 INFO L225 Difference]: With dead ends: 84 [2021-05-06 06:36:35,879 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 06:36:35,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1030.5ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 06:36:35,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 06:36:35,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2021-05-06 06:36:35,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 70 states have internal predecessors, (75), 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) [2021-05-06 06:36:35,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-05-06 06:36:35,881 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2021-05-06 06:36:35,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:35,881 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-05-06 06:36:35,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:35,881 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-05-06 06:36:35,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 06:36:35,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:35,882 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:36,098 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 06:36:36,098 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:36,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:36,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1405784683, now seen corresponding path program 27 times [2021-05-06 06:36:36,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:36,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708512316] [2021-05-06 06:36:36,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:36,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:36,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:36,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:36,517 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:36,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:36,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708512316] [2021-05-06 06:36:36,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708512316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:36,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912958850] [2021-05-06 06:36:36,517 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:37,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-06 06:36:37,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:37,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-06 06:36:37,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:37,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:37,473 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:37,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912958850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:37,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:37,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 06:36:37,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898115501] [2021-05-06 06:36:37,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 06:36:37,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:37,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 06:36:37,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:36:37,474 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:38,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:38,868 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2021-05-06 06:36:38,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 06:36:38,869 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 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 69 [2021-05-06 06:36:38,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:38,869 INFO L225 Difference]: With dead ends: 86 [2021-05-06 06:36:38,869 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 06:36:38,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1281.4ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 06:36:38,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 06:36:38,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 78. [2021-05-06 06:36:38,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 72 states have internal predecessors, (77), 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) [2021-05-06 06:36:38,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-05-06 06:36:38,871 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 69 [2021-05-06 06:36:38,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:38,872 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-05-06 06:36:38,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:38,872 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-05-06 06:36:38,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 06:36:38,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:38,872 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:39,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:39,076 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:39,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:39,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1427952397, now seen corresponding path program 28 times [2021-05-06 06:36:39,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:39,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535938584] [2021-05-06 06:36:39,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:39,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:39,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:39,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:39,532 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:39,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:39,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535938584] [2021-05-06 06:36:39,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535938584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:39,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302905913] [2021-05-06 06:36:39,532 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:39,572 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:36:39,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:39,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-06 06:36:39,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:39,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:39,669 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:39,669 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302905913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:39,669 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:39,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-06 06:36:39,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158742721] [2021-05-06 06:36:39,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 06:36:39,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:39,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 06:36:39,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 06:36:39,671 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:41,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:41,158 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2021-05-06 06:36:41,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 06:36:41,158 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 71 [2021-05-06 06:36:41,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:41,159 INFO L225 Difference]: With dead ends: 88 [2021-05-06 06:36:41,159 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 06:36:41,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1133.7ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 06:36:41,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 06:36:41,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 80. [2021-05-06 06:36:41,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 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) [2021-05-06 06:36:41,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-05-06 06:36:41,161 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 71 [2021-05-06 06:36:41,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:41,161 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-05-06 06:36:41,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:41,161 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-05-06 06:36:41,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 06:36:41,162 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:41,162 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:41,378 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:41,378 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:41,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:41,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1256289071, now seen corresponding path program 29 times [2021-05-06 06:36:41,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:41,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741767640] [2021-05-06 06:36:41,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:41,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:41,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:41,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:41,833 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:41,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:41,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741767640] [2021-05-06 06:36:41,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741767640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:41,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201813666] [2021-05-06 06:36:41,834 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:49,337 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-06 06:36:49,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:49,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-06 06:36:49,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:49,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:49,681 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:49,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201813666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:49,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:49,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-06 06:36:49,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275669395] [2021-05-06 06:36:49,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 06:36:49,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:49,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 06:36:49,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:36:49,682 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:51,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:51,106 INFO L93 Difference]: Finished difference Result 90 states and 97 transitions. [2021-05-06 06:36:51,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 06:36:51,107 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 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 73 [2021-05-06 06:36:51,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:51,107 INFO L225 Difference]: With dead ends: 90 [2021-05-06 06:36:51,107 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 06:36:51,108 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 54 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1375.3ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 06:36:51,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 06:36:51,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2021-05-06 06:36:51,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 76 states have internal predecessors, (81), 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) [2021-05-06 06:36:51,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-05-06 06:36:51,110 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 73 [2021-05-06 06:36:51,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:51,110 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-05-06 06:36:51,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:51,110 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-05-06 06:36:51,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 06:36:51,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:51,110 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:51,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 06:36:51,320 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:51,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:51,320 INFO L82 PathProgramCache]: Analyzing trace with hash 503409967, now seen corresponding path program 30 times [2021-05-06 06:36:51,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:51,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853463573] [2021-05-06 06:36:51,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:51,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:51,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:51,812 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:51,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:51,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853463573] [2021-05-06 06:36:51,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853463573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:51,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940815878] [2021-05-06 06:36:51,812 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 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 [2021-05-06 06:36:53,153 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-06 06:36:53,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:53,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-06 06:36:53,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:53,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:53,410 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:53,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940815878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:53,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:53,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-06 06:36:53,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76481896] [2021-05-06 06:36:53,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 06:36:53,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:53,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 06:36:53,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 06:36:53,411 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:54,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:54,968 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-05-06 06:36:54,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 06:36:54,969 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 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 75 [2021-05-06 06:36:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:54,969 INFO L225 Difference]: With dead ends: 92 [2021-05-06 06:36:54,970 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 06:36:54,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 69 SyntacticMatches, 9 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1381.9ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 06:36:54,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 06:36:54,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2021-05-06 06:36:54,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 78 states have (on average 1.064102564102564) internal successors, (83), 78 states have internal predecessors, (83), 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) [2021-05-06 06:36:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-06 06:36:54,972 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 75 [2021-05-06 06:36:54,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:54,972 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-06 06:36:54,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:54,972 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-06 06:36:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 06:36:54,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:54,973 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:55,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:55,178 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:55,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:55,178 INFO L82 PathProgramCache]: Analyzing trace with hash -642929139, now seen corresponding path program 31 times [2021-05-06 06:36:55,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:55,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088031405] [2021-05-06 06:36:55,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:55,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:55,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:55,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:55,669 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:55,669 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:55,669 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088031405] [2021-05-06 06:36:55,669 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088031405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:55,669 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638696245] [2021-05-06 06:36:55,670 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 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 [2021-05-06 06:36:55,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:55,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-06 06:36:55,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:55,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:55,824 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:55,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638696245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:55,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:55,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-06 06:36:55,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790921884] [2021-05-06 06:36:55,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 06:36:55,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:55,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 06:36:55,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 06:36:55,827 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:57,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:36:57,453 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2021-05-06 06:36:57,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 06:36:57,453 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 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 77 [2021-05-06 06:36:57,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:36:57,454 INFO L225 Difference]: With dead ends: 94 [2021-05-06 06:36:57,454 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 06:36:57,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1262.2ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 06:36:57,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 06:36:57,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 86. [2021-05-06 06:36:57,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.0625) internal successors, (85), 80 states have internal predecessors, (85), 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) [2021-05-06 06:36:57,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-05-06 06:36:57,456 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 77 [2021-05-06 06:36:57,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:36:57,456 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-05-06 06:36:57,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:36:57,456 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-05-06 06:36:57,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 06:36:57,456 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:36:57,457 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:36:57,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-06 06:36:57,661 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:36:57,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:36:57,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1531785067, now seen corresponding path program 32 times [2021-05-06 06:36:57,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:36:57,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014444208] [2021-05-06 06:36:57,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:36:57,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:58,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:36:58,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:36:58,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:58,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:36:58,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014444208] [2021-05-06 06:36:58,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014444208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:58,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176031736] [2021-05-06 06:36:58,178 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:36:58,219 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:36:58,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:36:58,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-06 06:36:58,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:36:58,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:36:58,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:36:58,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176031736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:36:58,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:36:58,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-06 06:36:58,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849434898] [2021-05-06 06:36:58,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 06:36:58,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:36:58,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 06:36:58,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 06:36:58,337 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:00,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:00,075 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2021-05-06 06:37:00,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 06:37:00,075 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 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 79 [2021-05-06 06:37:00,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:00,076 INFO L225 Difference]: With dead ends: 96 [2021-05-06 06:37:00,076 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 06:37:00,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1335.8ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 06:37:00,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 06:37:00,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-06 06:37:00,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 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) [2021-05-06 06:37:00,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-05-06 06:37:00,078 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 79 [2021-05-06 06:37:00,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:00,079 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-05-06 06:37:00,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:00,079 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-05-06 06:37:00,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 06:37:00,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:00,079 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:00,291 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 06:37:00,291 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:00,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:00,292 INFO L82 PathProgramCache]: Analyzing trace with hash -216936119, now seen corresponding path program 33 times [2021-05-06 06:37:00,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:00,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61792084] [2021-05-06 06:37:00,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:00,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:00,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:00,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:00,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:00,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:00,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61792084] [2021-05-06 06:37:00,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61792084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:00,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160227890] [2021-05-06 06:37:00,850 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:01,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-06 06:37:01,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:37:01,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-06 06:37:01,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:01,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:37:01,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:01,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160227890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:01,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:01,802 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-06 06:37:01,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024642940] [2021-05-06 06:37:01,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 06:37:01,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:01,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 06:37:01,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 06:37:01,803 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:03,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:03,614 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2021-05-06 06:37:03,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 06:37:03,614 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 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 81 [2021-05-06 06:37:03,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:03,614 INFO L225 Difference]: With dead ends: 98 [2021-05-06 06:37:03,615 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 06:37:03,615 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 74 SyntacticMatches, 10 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 1620.3ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 06:37:03,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 06:37:03,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 90. [2021-05-06 06:37:03,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 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) [2021-05-06 06:37:03,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-06 06:37:03,616 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 81 [2021-05-06 06:37:03,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:03,617 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-06 06:37:03,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:03,617 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-06 06:37:03,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 06:37:03,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:03,617 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:03,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-06 06:37:03,821 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:03,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:03,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1405783129, now seen corresponding path program 34 times [2021-05-06 06:37:03,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:03,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466796912] [2021-05-06 06:37:03,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:03,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:04,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:04,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:04,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:04,405 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:04,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466796912] [2021-05-06 06:37:04,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466796912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:04,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986845685] [2021-05-06 06:37:04,405 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:04,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:37:04,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:37:04,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-06 06:37:04,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:04,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:37:04,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:04,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986845685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:04,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:04,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-06 06:37:04,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107458011] [2021-05-06 06:37:04,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 06:37:04,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:04,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 06:37:04,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 06:37:04,564 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:06,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:06,442 INFO L93 Difference]: Finished difference Result 100 states and 107 transitions. [2021-05-06 06:37:06,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 06:37:06,443 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 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 83 [2021-05-06 06:37:06,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:06,443 INFO L225 Difference]: With dead ends: 100 [2021-05-06 06:37:06,443 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 06:37:06,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1536.7ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 06:37:06,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 06:37:06,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 92. [2021-05-06 06:37:06,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 86 states have (on average 1.058139534883721) internal successors, (91), 86 states have internal predecessors, (91), 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) [2021-05-06 06:37:06,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-05-06 06:37:06,445 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 83 [2021-05-06 06:37:06,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:06,445 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-05-06 06:37:06,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:06,445 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-05-06 06:37:06,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 06:37:06,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:06,446 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:06,646 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-06 06:37:06,646 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:06,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:06,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1426459003, now seen corresponding path program 35 times [2021-05-06 06:37:06,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:06,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844003391] [2021-05-06 06:37:06,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:06,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:07,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:07,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:07,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:07,250 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:07,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844003391] [2021-05-06 06:37:07,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844003391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:07,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881579452] [2021-05-06 06:37:07,250 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:42,448 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-06 06:37:42,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:37:42,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 06:37:42,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:43,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:37:43,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:43,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881579452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:43,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:43,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-06 06:37:43,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176810438] [2021-05-06 06:37:43,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 06:37:43,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:43,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 06:37:43,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 06:37:43,087 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:45,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:45,082 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2021-05-06 06:37:45,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 06:37:45,083 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 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 85 [2021-05-06 06:37:45,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:45,083 INFO L225 Difference]: With dead ends: 102 [2021-05-06 06:37:45,083 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 06:37:45,083 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 57 SyntacticMatches, 31 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 2001.7ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 06:37:45,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 06:37:45,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 94. [2021-05-06 06:37:45,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 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) [2021-05-06 06:37:45,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 98 transitions. [2021-05-06 06:37:45,085 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 98 transitions. Word has length 85 [2021-05-06 06:37:45,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:45,085 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 98 transitions. [2021-05-06 06:37:45,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:45,085 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 98 transitions. [2021-05-06 06:37:45,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 06:37:45,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:45,085 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:45,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-06 06:37:45,286 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:45,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:45,286 INFO L82 PathProgramCache]: Analyzing trace with hash 178862563, now seen corresponding path program 36 times [2021-05-06 06:37:45,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:45,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880329737] [2021-05-06 06:37:45,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:45,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:45,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:45,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:45,889 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:45,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:45,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880329737] [2021-05-06 06:37:45,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880329737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:45,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184915963] [2021-05-06 06:37:45,889 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:51,215 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-06 06:37:51,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:37:51,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 06:37:51,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:51,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:51,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184915963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:51,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:51,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-06 06:37:51,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412793279] [2021-05-06 06:37:51,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 06:37:51,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:51,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 06:37:51,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 06:37:51,755 INFO L87 Difference]: Start difference. First operand 94 states and 98 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:53,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:53,851 INFO L93 Difference]: Finished difference Result 104 states and 111 transitions. [2021-05-06 06:37:53,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 06:37:53,851 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 87 [2021-05-06 06:37:53,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:53,852 INFO L225 Difference]: With dead ends: 104 [2021-05-06 06:37:53,852 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 06:37:53,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 63 SyntacticMatches, 27 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 2010.6ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 06:37:53,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 06:37:53,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-05-06 06:37:53,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 90 states have (on average 1.0555555555555556) internal successors, (95), 90 states have internal predecessors, (95), 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) [2021-05-06 06:37:53,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-05-06 06:37:53,854 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 87 [2021-05-06 06:37:53,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:53,854 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-05-06 06:37:53,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:53,854 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-05-06 06:37:53,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 06:37:53,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:53,855 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:54,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-06 06:37:54,060 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:54,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:54,060 INFO L82 PathProgramCache]: Analyzing trace with hash 999628225, now seen corresponding path program 37 times [2021-05-06 06:37:54,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:54,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750189301] [2021-05-06 06:37:54,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:54,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:54,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:54,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:54,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:54,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:54,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750189301] [2021-05-06 06:37:54,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750189301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:54,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614320396] [2021-05-06 06:37:54,682 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:54,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:54,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-06 06:37:54,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:54,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:37:54,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:54,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614320396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:54,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:54,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-06 06:37:54,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003184824] [2021-05-06 06:37:54,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 06:37:54,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:54,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 06:37:54,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:37:54,867 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:57,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:37:57,049 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2021-05-06 06:37:57,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 06:37:57,049 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 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 89 [2021-05-06 06:37:57,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:37:57,049 INFO L225 Difference]: With dead ends: 106 [2021-05-06 06:37:57,049 INFO L226 Difference]: Without dead ends: 106 [2021-05-06 06:37:57,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1672.3ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 06:37:57,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-06 06:37:57,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 98. [2021-05-06 06:37:57,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 92 states have (on average 1.0543478260869565) internal successors, (97), 92 states have internal predecessors, (97), 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) [2021-05-06 06:37:57,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-05-06 06:37:57,051 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 89 [2021-05-06 06:37:57,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:37:57,052 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-05-06 06:37:57,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:37:57,052 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-05-06 06:37:57,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 06:37:57,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:37:57,052 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:37:57,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-06 06:37:57,265 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:37:57,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:37:57,265 INFO L82 PathProgramCache]: Analyzing trace with hash -518553057, now seen corresponding path program 38 times [2021-05-06 06:37:57,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:37:57,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653112495] [2021-05-06 06:37:57,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:37:57,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:57,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:37:57,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:37:57,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:57,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:37:57,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653112495] [2021-05-06 06:37:57,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653112495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:57,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978723902] [2021-05-06 06:37:57,988 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:37:58,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:37:58,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:37:58,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-06 06:37:58,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:37:58,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:37:58,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:37:58,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978723902] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:37:58,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:37:58,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-06 06:37:58,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293321012] [2021-05-06 06:37:58,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 06:37:58,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:37:58,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 06:37:58,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 06:37:58,170 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:00,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:00,419 INFO L93 Difference]: Finished difference Result 108 states and 115 transitions. [2021-05-06 06:38:00,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 06:38:00,420 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 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 91 [2021-05-06 06:38:00,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:00,420 INFO L225 Difference]: With dead ends: 108 [2021-05-06 06:38:00,420 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 06:38:00,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 1783.5ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 06:38:00,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 06:38:00,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2021-05-06 06:38:00,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.053191489361702) internal successors, (99), 94 states have internal predecessors, (99), 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) [2021-05-06 06:38:00,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-05-06 06:38:00,422 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 91 [2021-05-06 06:38:00,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:00,423 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-05-06 06:38:00,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:00,423 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-05-06 06:38:00,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 06:38:00,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:00,423 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:00,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:00,639 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:00,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:00,639 INFO L82 PathProgramCache]: Analyzing trace with hash 798115581, now seen corresponding path program 39 times [2021-05-06 06:38:00,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:00,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713987604] [2021-05-06 06:38:00,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:00,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:01,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:01,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:01,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:01,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:01,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713987604] [2021-05-06 06:38:01,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713987604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:01,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3726826] [2021-05-06 06:38:01,319 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:02,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-06 06:38:02,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:38:02,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-06 06:38:02,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:02,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:02,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:02,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3726826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:02,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:02,879 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-06 06:38:02,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71401657] [2021-05-06 06:38:02,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 06:38:02,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:02,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 06:38:02,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 06:38:02,880 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:05,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:05,186 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2021-05-06 06:38:05,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 06:38:05,187 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 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 93 [2021-05-06 06:38:05,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:05,187 INFO L225 Difference]: With dead ends: 110 [2021-05-06 06:38:05,187 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 06:38:05,187 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 1839.5ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 06:38:05,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 06:38:05,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2021-05-06 06:38:05,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 96 states have internal predecessors, (101), 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) [2021-05-06 06:38:05,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2021-05-06 06:38:05,189 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 93 [2021-05-06 06:38:05,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:05,189 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2021-05-06 06:38:05,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:05,189 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2021-05-06 06:38:05,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 06:38:05,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:05,190 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:05,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:05,394 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:05,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:05,395 INFO L82 PathProgramCache]: Analyzing trace with hash -898675621, now seen corresponding path program 40 times [2021-05-06 06:38:05,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:05,395 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201791482] [2021-05-06 06:38:05,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:05,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:06,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:06,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:06,101 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:06,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201791482] [2021-05-06 06:38:06,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201791482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:06,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823279198] [2021-05-06 06:38:06,101 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:06,144 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:38:06,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:38:06,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-06 06:38:06,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:06,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:06,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:06,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823279198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:06,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:06,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-06 06:38:06,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138221953] [2021-05-06 06:38:06,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 06:38:06,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:06,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 06:38:06,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 06:38:06,275 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:08,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:08,606 INFO L93 Difference]: Finished difference Result 112 states and 119 transitions. [2021-05-06 06:38:08,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 06:38:08,606 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 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 95 [2021-05-06 06:38:08,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:08,607 INFO L225 Difference]: With dead ends: 112 [2021-05-06 06:38:08,607 INFO L226 Difference]: Without dead ends: 112 [2021-05-06 06:38:08,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 1863.7ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 06:38:08,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-06 06:38:08,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2021-05-06 06:38:08,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 states have internal predecessors, (103), 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) [2021-05-06 06:38:08,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-05-06 06:38:08,609 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 95 [2021-05-06 06:38:08,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:08,609 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-05-06 06:38:08,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:08,609 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-05-06 06:38:08,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 06:38:08,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:08,610 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:08,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:08,810 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:08,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:08,810 INFO L82 PathProgramCache]: Analyzing trace with hash 572551737, now seen corresponding path program 41 times [2021-05-06 06:38:08,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:08,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55262603] [2021-05-06 06:38:08,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:08,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:09,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:09,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:09,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:09,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55262603] [2021-05-06 06:38:09,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55262603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:09,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342607499] [2021-05-06 06:38:09,607 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:05,455 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-06 06:39:05,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:39:05,471 WARN L261 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-06 06:39:05,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:06,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:39:06,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:06,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342607499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:06,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:06,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-06 06:39:06,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118683618] [2021-05-06 06:39:06,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 06:39:06,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:06,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 06:39:06,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 06:39:06,299 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:08,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:08,940 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2021-05-06 06:39:08,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 06:39:08,940 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 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 97 [2021-05-06 06:39:08,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:08,941 INFO L225 Difference]: With dead ends: 114 [2021-05-06 06:39:08,941 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 06:39:08,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 59 SyntacticMatches, 41 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 2677.1ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 06:39:08,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 06:39:08,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2021-05-06 06:39:08,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 100 states have (on average 1.05) internal successors, (105), 100 states have internal predecessors, (105), 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) [2021-05-06 06:39:08,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-05-06 06:39:08,943 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 97 [2021-05-06 06:39:08,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:08,944 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-05-06 06:39:08,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:08,944 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-05-06 06:39:08,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 06:39:08,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:08,944 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:09,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-06 06:39:09,153 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:09,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:09,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1377802391, now seen corresponding path program 42 times [2021-05-06 06:39:09,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:09,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940138477] [2021-05-06 06:39:09,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:09,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:09,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:09,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:09,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:09,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:09,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940138477] [2021-05-06 06:39:09,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940138477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:09,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147918901] [2021-05-06 06:39:09,943 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:20,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-06 06:39:20,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:39:20,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-06 06:39:20,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:20,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:20,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147918901] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:20,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:20,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-06 06:39:20,441 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50300986] [2021-05-06 06:39:20,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 06:39:20,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:20,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 06:39:20,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 06:39:20,442 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:23,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:23,193 INFO L93 Difference]: Finished difference Result 116 states and 123 transitions. [2021-05-06 06:39:23,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 06:39:23,194 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 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 99 [2021-05-06 06:39:23,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:23,194 INFO L225 Difference]: With dead ends: 116 [2021-05-06 06:39:23,194 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 06:39:23,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 86 SyntacticMatches, 16 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 2355.7ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 06:39:23,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 06:39:23,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 108. [2021-05-06 06:39:23,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 102 states have (on average 1.0490196078431373) internal successors, (107), 102 states have internal predecessors, (107), 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) [2021-05-06 06:39:23,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 112 transitions. [2021-05-06 06:39:23,196 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 112 transitions. Word has length 99 [2021-05-06 06:39:23,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:23,197 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 112 transitions. [2021-05-06 06:39:23,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:23,197 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 112 transitions. [2021-05-06 06:39:23,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 06:39:23,197 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:23,197 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:23,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:23,401 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:23,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:23,401 INFO L82 PathProgramCache]: Analyzing trace with hash 2129567605, now seen corresponding path program 43 times [2021-05-06 06:39:23,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:23,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654291976] [2021-05-06 06:39:23,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:23,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:24,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:24,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:24,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:24,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:24,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654291976] [2021-05-06 06:39:24,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654291976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:24,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242872570] [2021-05-06 06:39:24,234 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:24,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:24,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-06 06:39:24,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:24,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:39:24,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:24,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242872570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:24,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:24,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-06 06:39:24,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302454584] [2021-05-06 06:39:24,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 06:39:24,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:24,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 06:39:24,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 06:39:24,449 INFO L87 Difference]: Start difference. First operand 108 states and 112 transitions. Second operand has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:27,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:27,178 INFO L93 Difference]: Finished difference Result 118 states and 125 transitions. [2021-05-06 06:39:27,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 06:39:27,178 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 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 101 [2021-05-06 06:39:27,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:27,179 INFO L225 Difference]: With dead ends: 118 [2021-05-06 06:39:27,179 INFO L226 Difference]: Without dead ends: 118 [2021-05-06 06:39:27,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 2140.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 06:39:27,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-06 06:39:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 110. [2021-05-06 06:39:27,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0480769230769231) internal successors, (109), 104 states have internal predecessors, (109), 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) [2021-05-06 06:39:27,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-05-06 06:39:27,181 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 101 [2021-05-06 06:39:27,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:27,181 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-05-06 06:39:27,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:27,181 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-05-06 06:39:27,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 06:39:27,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:27,182 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:27,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:27,396 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:27,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:27,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1273534765, now seen corresponding path program 44 times [2021-05-06 06:39:27,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:27,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354886306] [2021-05-06 06:39:27,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:27,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:28,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:28,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:28,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:28,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:28,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354886306] [2021-05-06 06:39:28,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354886306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:28,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920367947] [2021-05-06 06:39:28,283 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:28,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:39:28,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:39:28,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-06 06:39:28,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:28,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:39:28,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:28,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920367947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:28,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:28,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-06 06:39:28,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695255674] [2021-05-06 06:39:28,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 06:39:28,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:28,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 06:39:28,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 06:39:28,507 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:31,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:31,388 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2021-05-06 06:39:31,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 06:39:31,388 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 103 [2021-05-06 06:39:31,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:31,389 INFO L225 Difference]: With dead ends: 120 [2021-05-06 06:39:31,389 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 06:39:31,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2252.4ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 06:39:31,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 06:39:31,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-05-06 06:39:31,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 106 states have (on average 1.0471698113207548) internal successors, (111), 106 states have internal predecessors, (111), 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) [2021-05-06 06:39:31,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2021-05-06 06:39:31,391 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 103 [2021-05-06 06:39:31,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:31,391 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2021-05-06 06:39:31,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:31,391 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2021-05-06 06:39:31,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 06:39:31,391 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:31,392 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:31,608 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-06 06:39:31,609 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:31,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:31,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1110167217, now seen corresponding path program 45 times [2021-05-06 06:39:31,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:31,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784474548] [2021-05-06 06:39:31,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:32,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:32,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:32,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:32,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:32,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784474548] [2021-05-06 06:39:32,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784474548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:32,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826086946] [2021-05-06 06:39:32,493 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:35,616 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-06 06:39:35,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:39:35,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-06 06:39:35,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:35,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:35,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826086946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:35,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:35,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-06 06:39:35,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270042540] [2021-05-06 06:39:35,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 06:39:35,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:35,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 06:39:35,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:39:35,882 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:38,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:38,791 INFO L93 Difference]: Finished difference Result 122 states and 129 transitions. [2021-05-06 06:39:38,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 06:39:38,791 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 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 105 [2021-05-06 06:39:38,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:38,792 INFO L225 Difference]: With dead ends: 122 [2021-05-06 06:39:38,792 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 06:39:38,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 2412.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 06:39:38,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 06:39:38,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 114. [2021-05-06 06:39:38,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 108 states have internal predecessors, (113), 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) [2021-05-06 06:39:38,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-05-06 06:39:38,794 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 105 [2021-05-06 06:39:38,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:38,794 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-05-06 06:39:38,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:38,795 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-05-06 06:39:38,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 06:39:38,795 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:38,795 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:39,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-06 06:39:39,000 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:39,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:39,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1664764145, now seen corresponding path program 46 times [2021-05-06 06:39:39,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:39,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392488858] [2021-05-06 06:39:39,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:39,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:39,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:39,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:39,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:39,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:39,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392488858] [2021-05-06 06:39:39,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392488858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:39,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172257619] [2021-05-06 06:39:39,917 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:39:39,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:39:39,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:39:39,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-06 06:39:39,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:39:40,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:39:40,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:40,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172257619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:40,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:39:40,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-06 06:39:40,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236512821] [2021-05-06 06:39:40,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 06:39:40,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:39:40,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 06:39:40,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 06:39:40,116 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:43,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:39:43,061 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-05-06 06:39:43,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 06:39:43,062 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 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 107 [2021-05-06 06:39:43,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:39:43,062 INFO L225 Difference]: With dead ends: 124 [2021-05-06 06:39:43,062 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 06:39:43,063 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 2351.9ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 06:39:43,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 06:39:43,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 116. [2021-05-06 06:39:43,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 110 states have (on average 1.0454545454545454) internal successors, (115), 110 states have internal predecessors, (115), 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) [2021-05-06 06:39:43,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-05-06 06:39:43,064 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 107 [2021-05-06 06:39:43,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:39:43,064 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-05-06 06:39:43,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:39:43,064 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-05-06 06:39:43,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 06:39:43,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:39:43,065 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:39:43,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-06 06:39:43,285 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:39:43,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:39:43,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1199112211, now seen corresponding path program 47 times [2021-05-06 06:39:43,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:39:43,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693528208] [2021-05-06 06:39:43,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:39:43,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:44,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:39:44,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:39:44,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:39:44,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:39:44,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693528208] [2021-05-06 06:39:44,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693528208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:39:44,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189156860] [2021-05-06 06:39:44,207 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:21,811 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-06 06:41:21,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:41:21,830 WARN L261 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-06 06:41:21,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:41:22,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:41:22,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:22,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189156860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:22,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:41:22,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-06 06:41:22,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972198721] [2021-05-06 06:41:22,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 06:41:22,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:41:22,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 06:41:22,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 06:41:22,849 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:26,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:41:26,020 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2021-05-06 06:41:26,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 06:41:26,020 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 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 109 [2021-05-06 06:41:26,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:41:26,021 INFO L225 Difference]: With dead ends: 126 [2021-05-06 06:41:26,021 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 06:41:26,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 66 SyntacticMatches, 46 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1222 ImplicationChecksByTransitivity, 3263.2ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 06:41:26,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 06:41:26,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 118. [2021-05-06 06:41:26,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 112 states have (on average 1.0446428571428572) internal successors, (117), 112 states have internal predecessors, (117), 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) [2021-05-06 06:41:26,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2021-05-06 06:41:26,023 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 109 [2021-05-06 06:41:26,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:41:26,023 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2021-05-06 06:41:26,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:26,023 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2021-05-06 06:41:26,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 06:41:26,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:41:26,023 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:41:26,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:26,224 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:41:26,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:41:26,224 INFO L82 PathProgramCache]: Analyzing trace with hash -384202421, now seen corresponding path program 48 times [2021-05-06 06:41:26,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:41:26,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759471794] [2021-05-06 06:41:26,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:41:26,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:27,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:41:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:27,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:27,187 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:41:27,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759471794] [2021-05-06 06:41:27,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759471794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:27,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457791081] [2021-05-06 06:41:27,188 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:39,473 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-06 06:41:39,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:41:39,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-06 06:41:39,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:41:39,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:39,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457791081] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:39,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:41:39,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-06 06:41:39,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501434879] [2021-05-06 06:41:39,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 06:41:39,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:41:39,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 06:41:39,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 06:41:39,935 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:43,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:41:43,134 INFO L93 Difference]: Finished difference Result 128 states and 135 transitions. [2021-05-06 06:41:43,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 06:41:43,134 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 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 111 [2021-05-06 06:41:43,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:41:43,135 INFO L225 Difference]: With dead ends: 128 [2021-05-06 06:41:43,135 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 06:41:43,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 15 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1206 ImplicationChecksByTransitivity, 2805.6ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 06:41:43,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 06:41:43,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2021-05-06 06:41:43,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 114 states have (on average 1.043859649122807) internal successors, (119), 114 states have internal predecessors, (119), 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) [2021-05-06 06:41:43,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2021-05-06 06:41:43,137 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 111 [2021-05-06 06:41:43,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:41:43,137 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2021-05-06 06:41:43,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:43,137 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2021-05-06 06:41:43,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 06:41:43,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:41:43,137 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:41:43,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:43,344 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:41:43,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:41:43,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1060057897, now seen corresponding path program 49 times [2021-05-06 06:41:43,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:41:43,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002599547] [2021-05-06 06:41:43,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:41:43,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:44,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:41:44,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:44,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:44,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:41:44,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002599547] [2021-05-06 06:41:44,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002599547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:44,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466598702] [2021-05-06 06:41:44,336 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:44,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:44,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-06 06:41:44,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:41:44,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:41:44,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:44,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466598702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:44,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:41:44,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-06 06:41:44,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329093905] [2021-05-06 06:41:44,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 06:41:44,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:41:44,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 06:41:44,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 06:41:44,547 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:47,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:41:47,937 INFO L93 Difference]: Finished difference Result 130 states and 137 transitions. [2021-05-06 06:41:47,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 06:41:47,938 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 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 113 [2021-05-06 06:41:47,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:41:47,938 INFO L225 Difference]: With dead ends: 130 [2021-05-06 06:41:47,938 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 06:41:47,939 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 2569.7ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 06:41:47,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 06:41:47,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 122. [2021-05-06 06:41:47,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 116 states have (on average 1.043103448275862) internal successors, (121), 116 states have internal predecessors, (121), 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) [2021-05-06 06:41:47,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-05-06 06:41:47,940 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 113 [2021-05-06 06:41:47,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:41:47,941 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-05-06 06:41:47,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:47,941 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-05-06 06:41:47,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 06:41:47,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:41:47,941 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:41:48,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:48,153 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:41:48,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:41:48,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1719786887, now seen corresponding path program 50 times [2021-05-06 06:41:48,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:41:48,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944118470] [2021-05-06 06:41:48,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:41:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:49,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:41:49,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:49,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:49,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:41:49,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944118470] [2021-05-06 06:41:49,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944118470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:49,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529200548] [2021-05-06 06:41:49,186 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:49,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:41:49,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:41:49,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 06:41:49,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:41:49,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:41:49,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:49,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529200548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:49,398 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:41:49,398 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-06 06:41:49,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480452847] [2021-05-06 06:41:49,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 06:41:49,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:41:49,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 06:41:49,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 06:41:49,399 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:52,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:41:52,892 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2021-05-06 06:41:52,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 06:41:52,892 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 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 115 [2021-05-06 06:41:52,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:41:52,893 INFO L225 Difference]: With dead ends: 132 [2021-05-06 06:41:52,893 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 06:41:52,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 2674.3ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 06:41:52,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 06:41:52,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2021-05-06 06:41:52,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.0423728813559323) internal successors, (123), 118 states have internal predecessors, (123), 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) [2021-05-06 06:41:52,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-05-06 06:41:52,894 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 115 [2021-05-06 06:41:52,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:41:52,895 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-05-06 06:41:52,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:41:52,895 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-05-06 06:41:52,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 06:41:52,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:41:52,895 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:41:53,111 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:53,112 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:41:53,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:41:53,112 INFO L82 PathProgramCache]: Analyzing trace with hash 64186469, now seen corresponding path program 51 times [2021-05-06 06:41:53,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:41:53,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709413544] [2021-05-06 06:41:53,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:41:53,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:54,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:41:54,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:41:54,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:54,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:41:54,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709413544] [2021-05-06 06:41:54,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709413544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:54,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657548805] [2021-05-06 06:41:54,163 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:41:56,852 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-05-06 06:41:56,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:41:56,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-06 06:41:56,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:41:57,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:41:57,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:41:57,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657548805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:41:57,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:41:57,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-06 06:41:57,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612165446] [2021-05-06 06:41:57,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 06:41:57,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:41:57,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 06:41:57,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:41:57,155 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:00,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:42:00,771 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2021-05-06 06:42:00,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 06:42:00,771 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 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 117 [2021-05-06 06:42:00,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:42:00,772 INFO L225 Difference]: With dead ends: 134 [2021-05-06 06:42:00,772 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 06:42:00,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 2885.1ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 06:42:00,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 06:42:00,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 126. [2021-05-06 06:42:00,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 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) [2021-05-06 06:42:00,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2021-05-06 06:42:00,774 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 117 [2021-05-06 06:42:00,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:42:00,774 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2021-05-06 06:42:00,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:00,774 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2021-05-06 06:42:00,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 06:42:00,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:42:00,775 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:42:00,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-06 06:42:00,979 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:42:00,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:42:00,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1829915709, now seen corresponding path program 52 times [2021-05-06 06:42:00,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:42:00,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249674542] [2021-05-06 06:42:00,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:42:00,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:02,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:42:02,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:02,062 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:42:02,062 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:42:02,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249674542] [2021-05-06 06:42:02,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249674542] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:42:02,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398001856] [2021-05-06 06:42:02,062 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:42:02,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:42:02,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:42:02,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-06 06:42:02,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:42:02,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:42:02,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:42:02,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398001856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:42:02,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:42:02,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-06 06:42:02,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608923520] [2021-05-06 06:42:02,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 06:42:02,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:42:02,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 06:42:02,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 06:42:02,293 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:06,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:42:06,042 INFO L93 Difference]: Finished difference Result 136 states and 143 transitions. [2021-05-06 06:42:06,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 06:42:06,043 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 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 119 [2021-05-06 06:42:06,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:42:06,043 INFO L225 Difference]: With dead ends: 136 [2021-05-06 06:42:06,043 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 06:42:06,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 2840.6ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 06:42:06,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 06:42:06,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 128. [2021-05-06 06:42:06,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 122 states have (on average 1.040983606557377) internal successors, (127), 122 states have internal predecessors, (127), 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) [2021-05-06 06:42:06,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 132 transitions. [2021-05-06 06:42:06,045 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 132 transitions. Word has length 119 [2021-05-06 06:42:06,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:42:06,045 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 132 transitions. [2021-05-06 06:42:06,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:06,046 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 132 transitions. [2021-05-06 06:42:06,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 06:42:06,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:42:06,046 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:42:06,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:42:06,253 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:42:06,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:42:06,253 INFO L82 PathProgramCache]: Analyzing trace with hash -995975263, now seen corresponding path program 53 times [2021-05-06 06:42:06,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:42:06,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521074444] [2021-05-06 06:42:06,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:42:06,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:07,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:42:07,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:07,384 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:42:07,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:42:07,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521074444] [2021-05-06 06:42:07,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521074444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:42:07,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471178251] [2021-05-06 06:42:07,385 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:43:56,331 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2021-05-06 06:43:56,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:43:56,354 WARN L261 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 159 conjunts are in the unsatisfiable core [2021-05-06 06:43:56,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:43:57,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:57,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:43:57,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471178251] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:57,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:43:57,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-06 06:43:57,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136730437] [2021-05-06 06:43:57,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 06:43:57,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:43:57,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 06:43:57,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 06:43:57,549 INFO L87 Difference]: Start difference. First operand 128 states and 132 transitions. Second operand has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:01,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:44:01,501 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2021-05-06 06:44:01,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 06:44:01,502 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 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 121 [2021-05-06 06:44:01,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:44:01,502 INFO L225 Difference]: With dead ends: 138 [2021-05-06 06:44:01,502 INFO L226 Difference]: Without dead ends: 138 [2021-05-06 06:44:01,503 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 73 SyntacticMatches, 51 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 3980.9ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 06:44:01,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-06 06:44:01,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 130. [2021-05-06 06:44:01,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 124 states have (on average 1.0403225806451613) internal successors, (129), 124 states have internal predecessors, (129), 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) [2021-05-06 06:44:01,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-05-06 06:44:01,504 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 121 [2021-05-06 06:44:01,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:44:01,504 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-05-06 06:44:01,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:01,504 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-05-06 06:44:01,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 06:44:01,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:44:01,505 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:44:01,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-06 06:44:01,705 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:44:01,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:44:01,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1556876287, now seen corresponding path program 54 times [2021-05-06 06:44:01,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:44:01,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356177667] [2021-05-06 06:44:01,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:44:01,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:02,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:44:02,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:02,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:44:02,891 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:44:02,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356177667] [2021-05-06 06:44:02,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356177667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:44:02,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018491976] [2021-05-06 06:44:02,891 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true