/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:06:28,419 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:06:28,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:06:28,477 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:06:28,512 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:06:28,515 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:06:28,518 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:06:28,521 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:06:28,525 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:06:28,526 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:06:28,529 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:06:28,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:06:28,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:06:28,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:06:28,544 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:06:28,547 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:06:28,557 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:06:28,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:06:28,574 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:06:28,575 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:06:28,581 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:06:28,622 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:06:28,622 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:06:28,627 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:06:28,627 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:06:28,628 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:06:28,628 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:06:28,628 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:06:28,628 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:06:28,628 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:06:28,629 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:06:28,630 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:06:28,630 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:06:28,630 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:06:28,630 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:06:28,631 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:06:28,631 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:06:28,631 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:06:28,631 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:06:28,631 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:06:28,631 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:06:28,632 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:06:28,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:06:28,633 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:06:29,050 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:06:29,068 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:06:29,071 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:06:29,072 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:06:29,072 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:06:29,073 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2021-05-02 13:06:29,126 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2174c443/de832d248fde4b62ad96029933fd3d4e/FLAGd2705b77f [2021-05-02 13:06:29,581 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:06:29,581 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2021-05-02 13:06:29,587 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2174c443/de832d248fde4b62ad96029933fd3d4e/FLAGd2705b77f [2021-05-02 13:06:30,010 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2174c443/de832d248fde4b62ad96029933fd3d4e [2021-05-02 13:06:30,014 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:06:30,016 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:06:30,034 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:06:30,041 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:06:30,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:06:30,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,049 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@394719be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30, skipping insertion in model container [2021-05-02 13:06:30,049 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:06:30,098 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:06:30,244 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/mono-crafted_12.c[319,332] [2021-05-02 13:06:30,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:06:30,278 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:06:30,302 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/mono-crafted_12.c[319,332] [2021-05-02 13:06:30,312 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:06:30,342 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:06:30,342 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30 WrapperNode [2021-05-02 13:06:30,342 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:06:30,343 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:06:30,344 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:06:30,345 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:06:30,354 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,354 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,363 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,379 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,385 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... [2021-05-02 13:06:30,388 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:06:30,390 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:06:30,390 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:06:30,391 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:06:30,391 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:06:30,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:06:30,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:06:30,462 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:06:30,462 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:06:30,462 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:06:30,462 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:06:30,462 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:06:30,463 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:06:30,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:06:30,465 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:06:30,465 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:06:30,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:06:30,638 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:06:30,638 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:06:30,641 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:06:30 BoogieIcfgContainer [2021-05-02 13:06:30,641 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:06:30,642 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:06:30,643 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:06:30,645 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:06:30,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:06:30" (1/3) ... [2021-05-02 13:06:30,649 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f9143a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:06:30, skipping insertion in model container [2021-05-02 13:06:30,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:06:30" (2/3) ... [2021-05-02 13:06:30,649 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f9143a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:06:30, skipping insertion in model container [2021-05-02 13:06:30,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:06:30" (3/3) ... [2021-05-02 13:06:30,650 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_12.c [2021-05-02 13:06:30,654 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:06:30,657 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:06:30,673 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:06:30,687 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:06:30,688 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:06:30,688 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:06:30,688 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:06:30,688 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:06:30,688 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:06:30,688 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:06:30,688 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:06:30,725 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:06:30,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:06:30,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:30,729 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:30,729 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:30,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:30,733 INFO L82 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2021-05-02 13:06:30,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:30,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724244060] [2021-05-02 13:06:30,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:30,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:30,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:30,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:30,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:30,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:30,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724244060] [2021-05-02 13:06:30,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724244060] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:06:30,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:06:30,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:06:30,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311557699] [2021-05-02 13:06:30,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:06:30,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:30,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:06:30,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:06:30,946 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:30,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:30,995 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-02 13:06:30,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:06:30,996 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2021-05-02 13:06:30,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:31,002 INFO L225 Difference]: With dead ends: 33 [2021-05-02 13:06:31,002 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 13:06:31,005 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:06:31,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 13:06:31,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 13:06:31,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 13:06:31,030 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 13:06:31,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:31,030 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 13:06:31,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,031 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 13:06:31,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:06:31,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:31,031 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:31,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:06:31,032 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:31,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:31,033 INFO L82 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2021-05-02 13:06:31,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:31,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249983504] [2021-05-02 13:06:31,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:31,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:31,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:31,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:31,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249983504] [2021-05-02 13:06:31,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249983504] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:06:31,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:06:31,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:06:31,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51856890] [2021-05-02 13:06:31,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:06:31,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:31,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:06:31,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:06:31,181 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:31,321 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 13:06:31,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:06:31,322 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2021-05-02 13:06:31,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:31,323 INFO L225 Difference]: With dead ends: 22 [2021-05-02 13:06:31,323 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:06:31,324 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 116.7ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:06:31,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:06:31,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 13:06:31,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 13:06:31,333 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 13:06:31,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:31,333 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 13:06:31,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,334 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 13:06:31,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:06:31,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:31,334 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:31,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:06:31,335 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:31,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:31,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1854346422, now seen corresponding path program 1 times [2021-05-02 13:06:31,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:31,336 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435030155] [2021-05-02 13:06:31,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:31,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:31,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:31,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:31,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435030155] [2021-05-02 13:06:31,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1435030155] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:06:31,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:06:31,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:06:31,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977454390] [2021-05-02 13:06:31,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:06:31,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:31,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:06:31,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:06:31,477 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:31,540 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 13:06:31,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:06:31,541 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 13:06:31,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:31,541 INFO L225 Difference]: With dead ends: 28 [2021-05-02 13:06:31,541 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:06:31,542 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 73.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:06:31,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:06:31,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 13:06:31,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 13:06:31,545 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 13:06:31,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:31,545 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 13:06:31,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,545 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 13:06:31,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:06:31,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:31,546 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:31,546 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:06:31,546 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:31,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:31,547 INFO L82 PathProgramCache]: Analyzing trace with hash 309814626, now seen corresponding path program 1 times [2021-05-02 13:06:31,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:31,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199624835] [2021-05-02 13:06:31,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:31,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:31,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:31,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:31,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199624835] [2021-05-02 13:06:31,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199624835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:31,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835363777] [2021-05-02 13:06:31,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:31,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:06:31,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:31,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:31,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835363777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:31,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:31,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:06:31,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114939926] [2021-05-02 13:06:31,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:06:31,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:31,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:06:31,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:06:31,702 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:31,767 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 13:06:31,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:06:31,767 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:06:31,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:31,768 INFO L225 Difference]: With dead ends: 31 [2021-05-02 13:06:31,768 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:06:31,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 65.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:06:31,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:06:31,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 13:06:31,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 13:06:31,771 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 13:06:31,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:31,772 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 13:06:31,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:31,772 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 13:06:31,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:06:31,772 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:31,772 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:31,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:31,985 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:31,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:31,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1077515338, now seen corresponding path program 2 times [2021-05-02 13:06:31,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:31,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480786333] [2021-05-02 13:06:31,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:32,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:32,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:32,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:32,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:32,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:32,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480786333] [2021-05-02 13:06:32,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480786333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:32,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905519644] [2021-05-02 13:06:32,167 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:32,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:06:32,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:32,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:06:32,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:32,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:32,286 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:32,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905519644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:32,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:32,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:06:32,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479687872] [2021-05-02 13:06:32,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:06:32,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:32,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:06:32,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:06:32,288 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:32,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:32,419 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 13:06:32,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:06:32,419 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:06:32,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:32,421 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:06:32,421 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:06:32,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 104.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:06:32,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:06:32,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 13:06:32,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:32,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 13:06:32,433 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 13:06:32,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:32,434 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 13:06:32,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:32,434 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 13:06:32,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:06:32,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:32,435 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:32,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:32,659 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:32,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:32,660 INFO L82 PathProgramCache]: Analyzing trace with hash 948575330, now seen corresponding path program 3 times [2021-05-02 13:06:32,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:32,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445923569] [2021-05-02 13:06:32,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:32,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:32,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:32,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:32,785 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:32,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:32,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445923569] [2021-05-02 13:06:32,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445923569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:32,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368895392] [2021-05-02 13:06:32,786 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 [2021-05-02 13:06:32,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:06:32,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:32,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:06:32,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:32,924 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:06:32,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368895392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:32,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:32,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 13:06:32,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651605931] [2021-05-02 13:06:32,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:06:32,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:32,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:06:32,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:06:32,926 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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) [2021-05-02 13:06:33,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:33,254 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 13:06:33,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:06:33,255 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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 23 [2021-05-02 13:06:33,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:33,256 INFO L225 Difference]: With dead ends: 43 [2021-05-02 13:06:33,256 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:06:33,256 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 306.7ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:06:33,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:06:33,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 13:06:33,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:33,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 13:06:33,261 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 13:06:33,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:33,261 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 13:06:33,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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) [2021-05-02 13:06:33,261 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 13:06:33,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:06:33,262 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:33,262 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:33,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:33,484 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:33,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:33,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1260080860, now seen corresponding path program 4 times [2021-05-02 13:06:33,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:33,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717771853] [2021-05-02 13:06:33,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:33,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:33,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:33,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:33,606 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:06:33,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:33,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717771853] [2021-05-02 13:06:33,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717771853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:33,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366641519] [2021-05-02 13:06:33,607 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 [2021-05-02 13:06:33,646 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:06:33,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:33,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:06:33,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:33,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:33,715 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:06:33,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366641519] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:33,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:33,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:06:33,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166950288] [2021-05-02 13:06:33,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:06:33,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:33,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:06:33,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:06:33,717 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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) [2021-05-02 13:06:33,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:33,973 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2021-05-02 13:06:33,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:06:33,974 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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 [2021-05-02 13:06:33,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:33,975 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:06:33,975 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 13:06:33,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 207.4ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:06:33,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 13:06:33,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 13:06:33,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:33,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 13:06:33,986 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 13:06:33,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:33,990 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 13:06:33,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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) [2021-05-02 13:06:33,990 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 13:06:33,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:06:33,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:33,991 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:34,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:34,192 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:34,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:34,192 INFO L82 PathProgramCache]: Analyzing trace with hash 26199052, now seen corresponding path program 5 times [2021-05-02 13:06:34,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:34,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717621944] [2021-05-02 13:06:34,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:34,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:34,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:34,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:34,315 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:06:34,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:34,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717621944] [2021-05-02 13:06:34,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717621944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:34,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241420792] [2021-05-02 13:06:34,315 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 [2021-05-02 13:06:34,451 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 13:06:34,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:34,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:06:34,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:34,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:34,598 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:34,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241420792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:34,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:34,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 13:06:34,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028382271] [2021-05-02 13:06:34,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:06:34,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:34,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:06:34,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:06:34,600 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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) [2021-05-02 13:06:34,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:34,888 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-02 13:06:34,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:06:34,889 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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 32 [2021-05-02 13:06:34,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:34,889 INFO L225 Difference]: With dead ends: 52 [2021-05-02 13:06:34,889 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 13:06:34,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 276.4ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:06:34,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 13:06:34,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 13:06:34,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:34,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 13:06:34,895 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 13:06:34,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:34,895 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 13:06:34,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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) [2021-05-02 13:06:34,895 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 13:06:34,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:06:34,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:34,896 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:35,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:35,101 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:35,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:35,102 INFO L82 PathProgramCache]: Analyzing trace with hash -86495988, now seen corresponding path program 6 times [2021-05-02 13:06:35,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:35,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566668242] [2021-05-02 13:06:35,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:35,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:35,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:35,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:35,287 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:06:35,287 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:35,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566668242] [2021-05-02 13:06:35,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566668242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:35,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137149067] [2021-05-02 13:06:35,288 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 [2021-05-02 13:06:35,365 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 13:06:35,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:35,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:06:35,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:35,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:35,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:35,528 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:06:35,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137149067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:35,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:35,529 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2021-05-02 13:06:35,529 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769819621] [2021-05-02 13:06:35,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:06:35,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:35,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:06:35,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:06:35,531 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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) [2021-05-02 13:06:36,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:36,134 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-02 13:06:36,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:06:36,135 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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 38 [2021-05-02 13:06:36,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:36,135 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:06:36,135 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:06:36,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 518.0ms TimeCoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:06:36,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:06:36,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 13:06:36,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:36,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 13:06:36,141 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 13:06:36,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:36,141 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 13:06:36,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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) [2021-05-02 13:06:36,141 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 13:06:36,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:06:36,142 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:36,142 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:36,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:36,368 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:36,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:36,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1869072650, now seen corresponding path program 7 times [2021-05-02 13:06:36,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:36,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437568529] [2021-05-02 13:06:36,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:36,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:36,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:36,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:36,526 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:06:36,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:36,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437568529] [2021-05-02 13:06:36,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437568529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:36,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036880082] [2021-05-02 13:06:36,527 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 [2021-05-02 13:06:36,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:36,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:06:36,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:36,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:36,699 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:06:36,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036880082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:36,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:36,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:06:36,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230095415] [2021-05-02 13:06:36,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:06:36,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:36,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:06:36,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:06:36,702 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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) [2021-05-02 13:06:37,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:37,151 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-05-02 13:06:37,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:06:37,152 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 44 [2021-05-02 13:06:37,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:37,153 INFO L225 Difference]: With dead ends: 64 [2021-05-02 13:06:37,153 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 13:06:37,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 369.1ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:06:37,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 13:06:37,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 13:06:37,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:37,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 13:06:37,159 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 13:06:37,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:37,159 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 13:06:37,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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) [2021-05-02 13:06:37,159 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 13:06:37,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:06:37,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:37,160 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:37,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:06:37,369 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:37,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:37,369 INFO L82 PathProgramCache]: Analyzing trace with hash -2061006558, now seen corresponding path program 8 times [2021-05-02 13:06:37,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:37,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078737205] [2021-05-02 13:06:37,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:37,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:37,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:37,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:37,525 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:06:37,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:37,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078737205] [2021-05-02 13:06:37,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078737205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:37,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004660500] [2021-05-02 13:06:37,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:37,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:06:37,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:37,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:06:37,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:37,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:37,745 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:06:37,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004660500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:37,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:37,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:06:37,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694479020] [2021-05-02 13:06:37,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:06:37,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:37,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:06:37,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:06:37,747 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:38,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:38,218 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 13:06:38,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:06:38,219 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 13:06:38,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:38,220 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:06:38,220 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:06:38,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 389.0ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:06:38,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:06:38,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 13:06:38,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:38,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 13:06:38,225 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 13:06:38,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:38,225 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 13:06:38,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:38,226 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 13:06:38,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:06:38,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:38,226 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:38,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:06:38,451 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:38,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:38,451 INFO L82 PathProgramCache]: Analyzing trace with hash 2052764170, now seen corresponding path program 9 times [2021-05-02 13:06:38,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:38,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454792887] [2021-05-02 13:06:38,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:38,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:38,736 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:06:38,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:38,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454792887] [2021-05-02 13:06:38,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454792887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:38,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712795088] [2021-05-02 13:06:38,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:38,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:06:38,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:38,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:06:38,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:39,061 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:06:39,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712795088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:39,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:39,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2021-05-02 13:06:39,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224680087] [2021-05-02 13:06:39,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:06:39,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:39,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:06:39,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:06:39,078 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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) [2021-05-02 13:06:40,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:40,283 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-05-02 13:06:40,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:06:40,284 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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 50 [2021-05-02 13:06:40,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:40,285 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:06:40,285 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:06:40,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 971.4ms TimeCoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:06:40,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:06:40,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 13:06:40,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:40,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 13:06:40,307 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 13:06:40,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:40,308 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 13:06:40,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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) [2021-05-02 13:06:40,308 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 13:06:40,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:06:40,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:40,310 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:40,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:40,542 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:40,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:40,542 INFO L82 PathProgramCache]: Analyzing trace with hash -795402420, now seen corresponding path program 10 times [2021-05-02 13:06:40,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:40,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855462943] [2021-05-02 13:06:40,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:40,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:40,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:40,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:40,779 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:06:40,779 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:40,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855462943] [2021-05-02 13:06:40,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855462943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:40,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234865943] [2021-05-02 13:06:40,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:40,859 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:06:40,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:40,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:06:40,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:40,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:40,971 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:06:40,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234865943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:40,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:40,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:06:40,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292864776] [2021-05-02 13:06:40,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:06:40,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:40,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:06:40,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:06:40,973 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:41,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:41,610 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2021-05-02 13:06:41,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:06:41,611 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 56 [2021-05-02 13:06:41,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:41,611 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:06:41,611 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:06:41,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 478.7ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:06:41,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:06:41,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 13:06:41,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:41,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 13:06:41,620 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 13:06:41,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:41,620 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 13:06:41,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:41,621 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 13:06:41,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:06:41,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:41,623 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:41,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:41,849 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:41,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:41,849 INFO L82 PathProgramCache]: Analyzing trace with hash -520127644, now seen corresponding path program 11 times [2021-05-02 13:06:41,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:41,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892812621] [2021-05-02 13:06:41,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:41,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:42,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:42,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:42,108 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:06:42,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:42,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892812621] [2021-05-02 13:06:42,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892812621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:42,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418737924] [2021-05-02 13:06:42,109 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:43,234 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 13:06:43,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:43,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:06:43,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:43,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:43,451 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 31 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:06:43,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418737924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:43,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:43,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 20 [2021-05-02 13:06:43,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561198735] [2021-05-02 13:06:43,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:06:43,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:43,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:06:43,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:06:43,453 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:44,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:44,580 INFO L93 Difference]: Finished difference Result 91 states and 104 transitions. [2021-05-02 13:06:44,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:06:44,581 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 [2021-05-02 13:06:44,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:44,582 INFO L225 Difference]: With dead ends: 91 [2021-05-02 13:06:44,582 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 13:06:44,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 856.2ms TimeCoverageRelationStatistics Valid=127, Invalid=1133, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:06:44,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 13:06:44,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 13:06:44,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.088235294117647) internal successors, (74), 68 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:44,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-05-02 13:06:44,588 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 59 [2021-05-02 13:06:44,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:44,589 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-05-02 13:06:44,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:44,589 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-05-02 13:06:44,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:06:44,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:44,589 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:44,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:06:44,790 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:44,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:44,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1843800420, now seen corresponding path program 12 times [2021-05-02 13:06:44,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:44,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244163755] [2021-05-02 13:06:44,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:44,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:45,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:45,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:45,054 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:06:45,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:45,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244163755] [2021-05-02 13:06:45,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244163755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:45,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249878276] [2021-05-02 13:06:45,055 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:45,199 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 13:06:45,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:45,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:06:45,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:45,415 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-05-02 13:06:45,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249878276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:45,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:45,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9] total 27 [2021-05-02 13:06:45,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442580053] [2021-05-02 13:06:45,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:06:45,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:45,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:06:45,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:06:45,417 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 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) [2021-05-02 13:06:46,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:46,961 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-05-02 13:06:46,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:06:46,961 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 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 71 [2021-05-02 13:06:46,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:46,962 INFO L225 Difference]: With dead ends: 100 [2021-05-02 13:06:46,962 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 13:06:46,965 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 1160.6ms TimeCoverageRelationStatistics Valid=231, Invalid=2319, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:06:46,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 13:06:46,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 13:06:46,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:46,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-05-02 13:06:46,973 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 71 [2021-05-02 13:06:46,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:46,973 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-05-02 13:06:46,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 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) [2021-05-02 13:06:46,974 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-05-02 13:06:46,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 13:06:46,974 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:46,975 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:47,190 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:06:47,190 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:47,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:47,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1072374558, now seen corresponding path program 13 times [2021-05-02 13:06:47,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:47,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412729776] [2021-05-02 13:06:47,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:47,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:47,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:47,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:47,493 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:06:47,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:47,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412729776] [2021-05-02 13:06:47,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412729776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:47,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719447760] [2021-05-02 13:06:47,493 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 [2021-05-02 13:06:47,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:47,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 13:06:47,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:47,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:47,715 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:06:47,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719447760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:47,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:47,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 13:06:47,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436881249] [2021-05-02 13:06:47,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:06:47,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:47,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:06:47,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:06:47,717 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:48,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:48,742 INFO L93 Difference]: Finished difference Result 103 states and 115 transitions. [2021-05-02 13:06:48,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:06:48,743 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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 [2021-05-02 13:06:48,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:48,744 INFO L225 Difference]: With dead ends: 103 [2021-05-02 13:06:48,744 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 13:06:48,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 749.0ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:06:48,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 13:06:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 13:06:48,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:48,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-05-02 13:06:48,749 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 77 [2021-05-02 13:06:48,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:48,749 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-05-02 13:06:48,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:48,749 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-05-02 13:06:48,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 13:06:48,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:48,750 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:48,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:06:48,969 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:48,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:48,970 INFO L82 PathProgramCache]: Analyzing trace with hash 742883274, now seen corresponding path program 14 times [2021-05-02 13:06:48,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:48,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179210643] [2021-05-02 13:06:48,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:48,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:49,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:49,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:49,312 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 261 proven. 495 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:06:49,312 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:49,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179210643] [2021-05-02 13:06:49,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179210643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:49,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55515644] [2021-05-02 13:06:49,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:49,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:06:49,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:49,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 13:06:49,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:49,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 261 proven. 495 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:06:49,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55515644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:49,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:49,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 13:06:49,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029556251] [2021-05-02 13:06:49,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:06:49,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:49,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:06:49,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:06:49,508 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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) [2021-05-02 13:06:50,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:50,484 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2021-05-02 13:06:50,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:06:50,485 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 80 [2021-05-02 13:06:50,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:50,486 INFO L225 Difference]: With dead ends: 106 [2021-05-02 13:06:50,486 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 13:06:50,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 735.9ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:06:50,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 13:06:50,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 13:06:50,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:50,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 91 transitions. [2021-05-02 13:06:50,493 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 91 transitions. Word has length 80 [2021-05-02 13:06:50,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:50,493 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 91 transitions. [2021-05-02 13:06:50,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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) [2021-05-02 13:06:50,493 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 91 transitions. [2021-05-02 13:06:50,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 13:06:50,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:50,495 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:50,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:50,713 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:50,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:50,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1155732450, now seen corresponding path program 15 times [2021-05-02 13:06:50,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:50,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425592015] [2021-05-02 13:06:50,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:50,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:51,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:51,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:51,074 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 275 proven. 551 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:06:51,075 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:51,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425592015] [2021-05-02 13:06:51,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425592015] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:51,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646371060] [2021-05-02 13:06:51,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:51,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 13:06:51,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:51,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:06:51,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:51,438 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-05-02 13:06:51,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646371060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:51,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:51,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 31 [2021-05-02 13:06:51,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913931682] [2021-05-02 13:06:51,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:06:51,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:51,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:06:51,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=852, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:06:51,440 INFO L87 Difference]: Start difference. First operand 85 states and 91 transitions. Second operand has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 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) [2021-05-02 13:06:53,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:53,410 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2021-05-02 13:06:53,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:06:53,411 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 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 83 [2021-05-02 13:06:53,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:53,411 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:06:53,411 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 13:06:53,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 1465.1ms TimeCoverageRelationStatistics Valid=270, Invalid=3152, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:06:53,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 13:06:53,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 13:06:53,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:53,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-05-02 13:06:53,429 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 83 [2021-05-02 13:06:53,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:53,429 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-05-02 13:06:53,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 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) [2021-05-02 13:06:53,429 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-05-02 13:06:53,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 13:06:53,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:53,430 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:53,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:06:53,645 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:53,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:53,646 INFO L82 PathProgramCache]: Analyzing trace with hash -522152540, now seen corresponding path program 16 times [2021-05-02 13:06:53,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:53,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152137060] [2021-05-02 13:06:53,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:53,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:54,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:54,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:54,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:06:54,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:54,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152137060] [2021-05-02 13:06:54,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152137060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:54,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101859113] [2021-05-02 13:06:54,027 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 [2021-05-02 13:06:54,075 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:06:54,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:54,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:06:54,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:54,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:54,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:06:54,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101859113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:54,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:54,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 13:06:54,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183124683] [2021-05-02 13:06:54,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:06:54,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:54,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:06:54,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:06:54,216 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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) [2021-05-02 13:06:55,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:55,567 INFO L93 Difference]: Finished difference Result 118 states and 132 transitions. [2021-05-02 13:06:55,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:06:55,567 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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 89 [2021-05-02 13:06:55,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:55,568 INFO L225 Difference]: With dead ends: 118 [2021-05-02 13:06:55,568 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 13:06:55,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 965.9ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:06:55,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 13:06:55,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 13:06:55,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0898876404494382) internal successors, (97), 89 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:55,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2021-05-02 13:06:55,574 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 89 [2021-05-02 13:06:55,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:55,574 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2021-05-02 13:06:55,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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) [2021-05-02 13:06:55,574 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2021-05-02 13:06:55,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 13:06:55,575 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:55,575 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:55,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:55,795 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:55,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:55,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1561453428, now seen corresponding path program 17 times [2021-05-02 13:06:55,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:55,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296568346] [2021-05-02 13:06:55,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:55,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:56,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:56,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:56,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:06:56,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:56,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296568346] [2021-05-02 13:06:56,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296568346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:56,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387289596] [2021-05-02 13:06:56,270 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 [2021-05-02 13:07:02,994 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 13:07:02,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:03,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 13:07:03,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:03,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:03,417 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:07:03,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387289596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:03,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:03,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:07:03,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283439676] [2021-05-02 13:07:03,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:07:03,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:03,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:07:03,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:07:03,420 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:04,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:04,873 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2021-05-02 13:07:04,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:07:04,874 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 92 [2021-05-02 13:07:04,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:04,875 INFO L225 Difference]: With dead ends: 121 [2021-05-02 13:07:04,875 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 13:07:04,876 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 75 SyntacticMatches, 20 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 1346.7ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:07:04,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 13:07:04,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 13:07:04,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0869565217391304) internal successors, (100), 92 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:04,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2021-05-02 13:07:04,880 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 92 [2021-05-02 13:07:04,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:04,881 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2021-05-02 13:07:04,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:04,881 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2021-05-02 13:07:04,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 13:07:04,881 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:04,882 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:05,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:05,087 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:05,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:05,088 INFO L82 PathProgramCache]: Analyzing trace with hash -954970972, now seen corresponding path program 18 times [2021-05-02 13:07:05,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:05,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973570392] [2021-05-02 13:07:05,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:05,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:05,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:05,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 385 proven. 737 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:07:05,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:05,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973570392] [2021-05-02 13:07:05,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973570392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:05,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713154142] [2021-05-02 13:07:05,560 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 [2021-05-02 13:07:06,069 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 13:07:06,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:06,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:07:06,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:06,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 13:07:06,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713154142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:06,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:06,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11] total 35 [2021-05-02 13:07:06,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089489812] [2021-05-02 13:07:06,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:07:06,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:06,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:07:06,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:07:06,415 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 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) [2021-05-02 13:07:09,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:09,119 INFO L93 Difference]: Finished difference Result 130 states and 146 transitions. [2021-05-02 13:07:09,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:07:09,120 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 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 95 [2021-05-02 13:07:09,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:09,121 INFO L225 Difference]: With dead ends: 130 [2021-05-02 13:07:09,121 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 13:07:09,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1937.4ms TimeCoverageRelationStatistics Valid=309, Invalid=4113, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:07:09,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 13:07:09,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 13:07:09,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0918367346938775) internal successors, (107), 98 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:09,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-05-02 13:07:09,127 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 95 [2021-05-02 13:07:09,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:09,127 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-05-02 13:07:09,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 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) [2021-05-02 13:07:09,128 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-05-02 13:07:09,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 13:07:09,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:09,128 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:09,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:07:09,334 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:09,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:09,334 INFO L82 PathProgramCache]: Analyzing trace with hash -2029901406, now seen corresponding path program 19 times [2021-05-02 13:07:09,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:09,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804139670] [2021-05-02 13:07:09,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:09,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:09,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:09,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:09,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:07:09,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:09,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804139670] [2021-05-02 13:07:09,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804139670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:09,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385740321] [2021-05-02 13:07:09,795 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 [2021-05-02 13:07:09,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:09,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:07:09,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:10,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:10,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:07:10,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385740321] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:10,046 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:10,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:07:10,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173196581] [2021-05-02 13:07:10,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:07:10,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:10,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:07:10,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:07:10,048 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:11,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:11,751 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2021-05-02 13:07:11,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:07:11,752 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 [2021-05-02 13:07:11,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:11,752 INFO L225 Difference]: With dead ends: 133 [2021-05-02 13:07:11,752 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 13:07:11,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1229.3ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:07:11,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 13:07:11,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 13:07:11,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 101 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:11,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 13:07:11,757 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 101 [2021-05-02 13:07:11,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:11,757 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 13:07:11,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:11,758 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 13:07:11,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 13:07:11,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:11,758 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:11,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:11,974 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:11,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:11,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1505006730, now seen corresponding path program 20 times [2021-05-02 13:07:11,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:11,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404575586] [2021-05-02 13:07:11,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:12,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:12,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:12,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:12,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:07:12,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:12,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404575586] [2021-05-02 13:07:12,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404575586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:12,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785254517] [2021-05-02 13:07:12,423 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 [2021-05-02 13:07:12,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:07:12,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:12,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 13:07:12,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:12,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:12,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:07:12,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785254517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:12,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:12,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 13:07:12,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520746276] [2021-05-02 13:07:12,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:07:12,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:12,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:07:12,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:07:12,637 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 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) [2021-05-02 13:07:14,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:14,306 INFO L93 Difference]: Finished difference Result 136 states and 152 transitions. [2021-05-02 13:07:14,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:07:14,307 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 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 104 [2021-05-02 13:07:14,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:14,308 INFO L225 Difference]: With dead ends: 136 [2021-05-02 13:07:14,308 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 13:07:14,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1201.5ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:07:14,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 13:07:14,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 13:07:14,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 104 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:14,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 117 transitions. [2021-05-02 13:07:14,312 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 117 transitions. Word has length 104 [2021-05-02 13:07:14,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:14,313 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 117 transitions. [2021-05-02 13:07:14,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 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) [2021-05-02 13:07:14,313 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 117 transitions. [2021-05-02 13:07:14,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 13:07:14,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:14,313 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:14,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:07:14,530 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:14,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:14,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1650155682, now seen corresponding path program 21 times [2021-05-02 13:07:14,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:14,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421455273] [2021-05-02 13:07:14,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:14,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:14,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:14,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:14,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:07:14,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:14,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421455273] [2021-05-02 13:07:14,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421455273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:14,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703000717] [2021-05-02 13:07:14,996 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 [2021-05-02 13:07:15,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 13:07:15,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:15,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:07:15,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:15,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2021-05-02 13:07:15,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703000717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:15,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:15,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 12] total 39 [2021-05-02 13:07:15,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871429943] [2021-05-02 13:07:15,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:07:15,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:15,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:07:15,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1382, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:07:15,471 INFO L87 Difference]: Start difference. First operand 109 states and 117 transitions. Second operand has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 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) [2021-05-02 13:07:18,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:18,384 INFO L93 Difference]: Finished difference Result 145 states and 163 transitions. [2021-05-02 13:07:18,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:07:18,385 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 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 107 [2021-05-02 13:07:18,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:18,385 INFO L225 Difference]: With dead ends: 145 [2021-05-02 13:07:18,385 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 13:07:18,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 2050.6ms TimeCoverageRelationStatistics Valid=348, Invalid=5202, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 13:07:18,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 13:07:18,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 13:07:18,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0909090909090908) internal successors, (120), 110 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:18,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2021-05-02 13:07:18,390 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 107 [2021-05-02 13:07:18,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:18,391 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2021-05-02 13:07:18,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 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) [2021-05-02 13:07:18,391 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2021-05-02 13:07:18,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 13:07:18,391 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:18,391 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 26, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:18,608 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:07:18,608 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:18,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:18,608 INFO L82 PathProgramCache]: Analyzing trace with hash 739068132, now seen corresponding path program 22 times [2021-05-02 13:07:18,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:18,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350073417] [2021-05-02 13:07:18,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:18,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:19,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:19,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:19,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:07:19,096 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:19,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350073417] [2021-05-02 13:07:19,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350073417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:19,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094758678] [2021-05-02 13:07:19,096 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 [2021-05-02 13:07:19,158 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:07:19,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:19,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 13:07:19,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:19,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:19,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:07:19,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094758678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:19,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:19,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 13:07:19,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608283758] [2021-05-02 13:07:19,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:07:19,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:19,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:07:19,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:07:19,321 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 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) [2021-05-02 13:07:21,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:21,201 INFO L93 Difference]: Finished difference Result 148 states and 166 transitions. [2021-05-02 13:07:21,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:07:21,201 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 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 113 [2021-05-02 13:07:21,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:21,202 INFO L225 Difference]: With dead ends: 148 [2021-05-02 13:07:21,202 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 13:07:21,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1350.2ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:07:21,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 13:07:21,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-05-02 13:07:21,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0884955752212389) internal successors, (123), 113 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:21,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2021-05-02 13:07:21,207 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 113 [2021-05-02 13:07:21,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:21,207 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2021-05-02 13:07:21,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 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) [2021-05-02 13:07:21,208 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2021-05-02 13:07:21,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 13:07:21,208 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:21,208 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:21,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:21,423 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:21,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:21,423 INFO L82 PathProgramCache]: Analyzing trace with hash -349268020, now seen corresponding path program 23 times [2021-05-02 13:07:21,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:21,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061326925] [2021-05-02 13:07:21,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:21,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:21,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:21,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:07:21,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:21,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061326925] [2021-05-02 13:07:21,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061326925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:21,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017909426] [2021-05-02 13:07:21,968 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 [2021-05-02 13:07:29,336 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 13:07:29,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:29,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 92 conjunts are in the unsatisfiable core [2021-05-02 13:07:29,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:29,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:07:29,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017909426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:29,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:29,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 33 [2021-05-02 13:07:29,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535824458] [2021-05-02 13:07:29,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:07:29,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:29,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:07:29,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:07:29,815 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:31,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:31,931 INFO L93 Difference]: Finished difference Result 151 states and 169 transitions. [2021-05-02 13:07:31,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:07:31,931 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 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 116 [2021-05-02 13:07:31,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:31,932 INFO L225 Difference]: With dead ends: 151 [2021-05-02 13:07:31,932 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 13:07:31,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 98 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 1800.3ms TimeCoverageRelationStatistics Valid=240, Invalid=3542, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:07:31,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 13:07:31,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 13:07:31,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0862068965517242) internal successors, (126), 116 states have internal predecessors, (126), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:31,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 130 transitions. [2021-05-02 13:07:31,951 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 130 transitions. Word has length 116 [2021-05-02 13:07:31,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:31,952 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 130 transitions. [2021-05-02 13:07:31,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:31,953 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 130 transitions. [2021-05-02 13:07:31,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 13:07:31,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:31,953 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:32,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:07:32,159 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:32,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:32,160 INFO L82 PathProgramCache]: Analyzing trace with hash -263454748, now seen corresponding path program 24 times [2021-05-02 13:07:32,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:32,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793868957] [2021-05-02 13:07:32,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:32,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:32,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:32,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:07:32,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:32,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793868957] [2021-05-02 13:07:32,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793868957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:32,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850451765] [2021-05-02 13:07:32,766 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 [2021-05-02 13:07:33,498 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 13:07:33,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:33,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:07:33,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:33,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 13:07:33,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850451765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:33,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:33,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 13] total 43 [2021-05-02 13:07:33,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804439081] [2021-05-02 13:07:33,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:07:33,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:33,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:07:33,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1695, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:07:33,995 INFO L87 Difference]: Start difference. First operand 121 states and 130 transitions. Second operand has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 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) [2021-05-02 13:07:37,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:37,647 INFO L93 Difference]: Finished difference Result 160 states and 180 transitions. [2021-05-02 13:07:37,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:07:37,647 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 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 119 [2021-05-02 13:07:37,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:37,648 INFO L225 Difference]: With dead ends: 160 [2021-05-02 13:07:37,648 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 13:07:37,650 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 2652.9ms TimeCoverageRelationStatistics Valid=387, Invalid=6419, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 13:07:37,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 13:07:37,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 13:07:37,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0901639344262295) internal successors, (133), 122 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:37,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2021-05-02 13:07:37,656 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 119 [2021-05-02 13:07:37,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:37,656 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2021-05-02 13:07:37,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 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) [2021-05-02 13:07:37,656 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2021-05-02 13:07:37,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 13:07:37,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:37,657 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 29, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:37,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:37,863 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:37,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:37,863 INFO L82 PathProgramCache]: Analyzing trace with hash 2022958690, now seen corresponding path program 25 times [2021-05-02 13:07:37,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:37,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208555372] [2021-05-02 13:07:37,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:37,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:38,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:38,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 771 proven. 1276 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:38,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:38,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208555372] [2021-05-02 13:07:38,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208555372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:38,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124407602] [2021-05-02 13:07:38,468 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 [2021-05-02 13:07:38,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:38,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:07:38,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:38,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:38,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 771 proven. 1276 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:38,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124407602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:38,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:38,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:07:38,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692650788] [2021-05-02 13:07:38,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:07:38,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:38,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:07:38,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:07:38,746 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:40,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:40,751 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2021-05-02 13:07:40,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:07:40,752 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 125 [2021-05-02 13:07:40,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:40,752 INFO L225 Difference]: With dead ends: 163 [2021-05-02 13:07:40,752 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 13:07:40,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1477.0ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:07:40,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 13:07:40,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-05-02 13:07:40,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.088) internal successors, (136), 125 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:40,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 140 transitions. [2021-05-02 13:07:40,757 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 140 transitions. Word has length 125 [2021-05-02 13:07:40,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:40,757 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 140 transitions. [2021-05-02 13:07:40,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:40,757 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 140 transitions. [2021-05-02 13:07:40,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 13:07:40,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:40,758 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:40,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:07:40,972 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:40,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:40,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1595008694, now seen corresponding path program 26 times [2021-05-02 13:07:40,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:40,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135704474] [2021-05-02 13:07:40,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:40,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:41,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:41,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:41,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 797 proven. 1365 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:41,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:41,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135704474] [2021-05-02 13:07:41,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135704474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:41,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823141031] [2021-05-02 13:07:41,617 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 [2021-05-02 13:07:41,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:07:41,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:41,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 13:07:41,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:41,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:41,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 797 proven. 1365 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:41,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823141031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:41,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:41,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:07:41,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266450227] [2021-05-02 13:07:41,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:07:41,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:41,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:07:41,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:07:41,857 INFO L87 Difference]: Start difference. First operand 130 states and 140 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 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) [2021-05-02 13:07:44,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:44,312 INFO L93 Difference]: Finished difference Result 166 states and 186 transitions. [2021-05-02 13:07:44,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:07:44,313 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 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 128 [2021-05-02 13:07:44,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:44,313 INFO L225 Difference]: With dead ends: 166 [2021-05-02 13:07:44,313 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 13:07:44,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1770.6ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:07:44,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 13:07:44,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 13:07:44,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:44,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 13:07:44,319 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 128 [2021-05-02 13:07:44,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:44,319 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 13:07:44,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 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) [2021-05-02 13:07:44,319 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 13:07:44,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 13:07:44,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:44,320 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:44,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:07:44,537 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:44,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:44,537 INFO L82 PathProgramCache]: Analyzing trace with hash 2037914978, now seen corresponding path program 27 times [2021-05-02 13:07:44,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:44,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637337127] [2021-05-02 13:07:44,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:44,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:45,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:45,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:45,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:45,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:45,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637337127] [2021-05-02 13:07:45,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637337127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:45,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117685886] [2021-05-02 13:07:45,206 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 [2021-05-02 13:07:45,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 13:07:45,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:45,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:07:45,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:45,916 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 923 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2021-05-02 13:07:45,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117685886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:45,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:45,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14] total 47 [2021-05-02 13:07:45,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225925671] [2021-05-02 13:07:45,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:07:45,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:45,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:07:45,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:07:45,918 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 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) [2021-05-02 13:07:49,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:49,562 INFO L93 Difference]: Finished difference Result 175 states and 197 transitions. [2021-05-02 13:07:49,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:07:49,562 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 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 131 [2021-05-02 13:07:49,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:49,563 INFO L225 Difference]: With dead ends: 175 [2021-05-02 13:07:49,563 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 13:07:49,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 2802.9ms TimeCoverageRelationStatistics Valid=426, Invalid=7764, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 13:07:49,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 13:07:49,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 13:07:49,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 134 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:49,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2021-05-02 13:07:49,587 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 131 [2021-05-02 13:07:49,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:49,588 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2021-05-02 13:07:49,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 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) [2021-05-02 13:07:49,588 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2021-05-02 13:07:49,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 13:07:49,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:49,590 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 32, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:49,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:49,797 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:49,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:49,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1003981860, now seen corresponding path program 28 times [2021-05-02 13:07:49,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:49,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838592906] [2021-05-02 13:07:49,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:49,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:50,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:50,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:50,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 947 proven. 1552 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:07:50,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:50,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838592906] [2021-05-02 13:07:50,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838592906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:50,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874239910] [2021-05-02 13:07:50,829 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 [2021-05-02 13:07:50,890 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:07:50,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:50,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 13:07:50,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:51,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:51,507 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 83 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:07:51,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874239910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:51,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:51,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 44] total 46 [2021-05-02 13:07:51,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814034878] [2021-05-02 13:07:51,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 13:07:51,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:51,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 13:07:51,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1948, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:07:51,509 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:56,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:56,007 INFO L93 Difference]: Finished difference Result 205 states and 236 transitions. [2021-05-02 13:07:56,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:07:56,007 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 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 137 [2021-05-02 13:07:56,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:56,008 INFO L225 Difference]: With dead ends: 205 [2021-05-02 13:07:56,008 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 13:07:56,009 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 892 ImplicationChecksByTransitivity, 3188.1ms TimeCoverageRelationStatistics Valid=323, Invalid=7333, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:07:56,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 13:07:56,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 13:07:56,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:56,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 13:07:56,029 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 137 [2021-05-02 13:07:56,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:56,030 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 13:07:56,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:56,030 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 13:07:56,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 13:07:56,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:56,031 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:56,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:56,245 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:56,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:56,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1749835996, now seen corresponding path program 29 times [2021-05-02 13:07:56,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:56,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15202120] [2021-05-02 13:07:56,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:56,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:57,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:57,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:57,442 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:07:57,442 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:57,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15202120] [2021-05-02 13:07:57,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15202120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:57,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187333450] [2021-05-02 13:07:57,442 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 [2021-05-02 13:16:26,304 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 13:16:26,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:26,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 13:16:26,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:26,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:26,898 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 535 proven. 3480 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:16:26,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187333450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:26,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:26,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 51] total 53 [2021-05-02 13:16:26,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203762230] [2021-05-02 13:16:26,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 13:16:26,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:26,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 13:16:26,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2610, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:16:26,900 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:32,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:32,007 INFO L93 Difference]: Finished difference Result 226 states and 254 transitions. [2021-05-02 13:16:32,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:16:32,007 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 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 167 [2021-05-02 13:16:32,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:32,008 INFO L225 Difference]: With dead ends: 226 [2021-05-02 13:16:32,008 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 13:16:32,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1198 ImplicationChecksByTransitivity, 3470.8ms TimeCoverageRelationStatistics Valid=385, Invalid=9917, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 13:16:32,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 13:16:32,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-02 13:16:32,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0648648648648649) internal successors, (197), 185 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:32,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 201 transitions. [2021-05-02 13:16:32,016 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 201 transitions. Word has length 167 [2021-05-02 13:16:32,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:32,016 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 201 transitions. [2021-05-02 13:16:32,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:32,016 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 201 transitions. [2021-05-02 13:16:32,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 13:16:32,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:32,017 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 49, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:32,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 13:16:32,228 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:32,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:32,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1730221300, now seen corresponding path program 30 times [2021-05-02 13:16:32,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:32,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973892119] [2021-05-02 13:16:32,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:32,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:33,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:33,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:16:33,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:33,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973892119] [2021-05-02 13:16:33,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973892119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:33,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848011612] [2021-05-02 13:16:33,636 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 [2021-05-02 13:16:35,860 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 13:16:35,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:35,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:16:35,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,777 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 0 proven. 1566 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2021-05-02 13:16:36,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848011612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:36,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 15] total 66 [2021-05-02 13:16:36,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400064889] [2021-05-02 13:16:36,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 13:16:36,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:36,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 13:16:36,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=4112, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:16:36,779 INFO L87 Difference]: Start difference. First operand 190 states and 201 transitions. Second operand has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 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) [2021-05-02 13:16:44,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:44,192 INFO L93 Difference]: Finished difference Result 235 states and 259 transitions. [2021-05-02 13:16:44,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 13:16:44,193 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 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 188 [2021-05-02 13:16:44,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:44,194 INFO L225 Difference]: With dead ends: 235 [2021-05-02 13:16:44,194 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 13:16:44,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1966 ImplicationChecksByTransitivity, 5148.1ms TimeCoverageRelationStatistics Valid=630, Invalid=15882, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 13:16:44,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 13:16:44,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 13:16:44,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.068062827225131) internal successors, (204), 191 states have internal predecessors, (204), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:44,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 208 transitions. [2021-05-02 13:16:44,214 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 208 transitions. Word has length 188 [2021-05-02 13:16:44,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:44,214 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 208 transitions. [2021-05-02 13:16:44,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 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) [2021-05-02 13:16:44,214 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 208 transitions. [2021-05-02 13:16:44,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 13:16:44,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:44,215 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 50, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:44,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:44,430 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:44,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:44,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1140839158, now seen corresponding path program 31 times [2021-05-02 13:16:44,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:44,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003601264] [2021-05-02 13:16:44,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:44,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:45,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:45,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:45,990 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1621 proven. 3775 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:16:45,990 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:45,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003601264] [2021-05-02 13:16:45,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003601264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:45,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334835038] [2021-05-02 13:16:45,991 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 [2021-05-02 13:16:46,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:46,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 13:16:46,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:46,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,354 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1621 proven. 3775 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:16:46,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1334835038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:46,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:46,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 13:16:46,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884877555] [2021-05-02 13:16:46,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:16:46,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:46,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:16:46,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:16:46,355 INFO L87 Difference]: Start difference. First operand 196 states and 208 transitions. Second operand has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:51,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:51,280 INFO L93 Difference]: Finished difference Result 238 states and 262 transitions. [2021-05-02 13:16:51,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 13:16:51,281 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 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 194 [2021-05-02 13:16:51,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:51,282 INFO L225 Difference]: With dead ends: 238 [2021-05-02 13:16:51,282 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 13:16:51,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 196 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3433.0ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 13:16:51,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 13:16:51,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-02 13:16:51,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0670103092783505) internal successors, (207), 194 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:51,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 211 transitions. [2021-05-02 13:16:51,292 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 211 transitions. Word has length 194 [2021-05-02 13:16:51,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:51,293 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 211 transitions. [2021-05-02 13:16:51,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:51,293 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 211 transitions. [2021-05-02 13:16:51,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-02 13:16:51,294 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:51,294 INFO L523 BasicCegarLoop]: trace histogram [62, 62, 51, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:51,494 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:16:51,494 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:51,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:51,495 INFO L82 PathProgramCache]: Analyzing trace with hash -367211742, now seen corresponding path program 32 times [2021-05-02 13:16:51,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:51,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488442107] [2021-05-02 13:16:51,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:51,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:53,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1653 proven. 3927 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:16:53,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:53,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488442107] [2021-05-02 13:16:53,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488442107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:53,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566494737] [2021-05-02 13:16:53,324 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 [2021-05-02 13:16:53,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:53,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:53,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 13:16:53,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:53,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,678 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1653 proven. 3927 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:16:53,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566494737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:53,678 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:53,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 13:16:53,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731737326] [2021-05-02 13:16:53,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 13:16:53,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:53,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 13:16:53,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:16:53,679 INFO L87 Difference]: Start difference. First operand 199 states and 211 transitions. Second operand has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:59,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:59,200 INFO L93 Difference]: Finished difference Result 241 states and 265 transitions. [2021-05-02 13:16:59,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:16:59,201 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 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 197 [2021-05-02 13:16:59,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:59,204 INFO L225 Difference]: With dead ends: 241 [2021-05-02 13:16:59,204 INFO L226 Difference]: Without dead ends: 203 [2021-05-02 13:16:59,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 3994.9ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 13:16:59,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-02 13:16:59,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2021-05-02 13:16:59,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0659898477157361) internal successors, (210), 197 states have internal predecessors, (210), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:59,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 214 transitions. [2021-05-02 13:16:59,226 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 214 transitions. Word has length 197 [2021-05-02 13:16:59,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:59,226 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 214 transitions. [2021-05-02 13:16:59,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:59,226 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 214 transitions. [2021-05-02 13:16:59,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-05-02 13:16:59,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:59,227 INFO L523 BasicCegarLoop]: trace histogram [63, 63, 52, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:59,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:16:59,452 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:59,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:59,452 INFO L82 PathProgramCache]: Analyzing trace with hash -27372022, now seen corresponding path program 33 times [2021-05-02 13:16:59,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:59,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224289072] [2021-05-02 13:16:59,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:59,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:00,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:01,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 1685 proven. 4082 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:17:01,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:01,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224289072] [2021-05-02 13:17:01,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224289072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:01,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055235168] [2021-05-02 13:17:01,003 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 [2021-05-02 13:17:01,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 13:17:01,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:01,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:17:01,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:02,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 0 proven. 1840 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2021-05-02 13:17:02,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1055235168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:02,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:02,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 16] total 70 [2021-05-02 13:17:02,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888324405] [2021-05-02 13:17:02,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 13:17:02,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:02,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 13:17:02,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=4641, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:17:02,237 INFO L87 Difference]: Start difference. First operand 202 states and 214 transitions. Second operand has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 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) [2021-05-02 13:17:10,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:10,981 INFO L93 Difference]: Finished difference Result 250 states and 276 transitions. [2021-05-02 13:17:10,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 13:17:10,981 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 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 200 [2021-05-02 13:17:10,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:10,982 INFO L225 Difference]: With dead ends: 250 [2021-05-02 13:17:10,982 INFO L226 Difference]: Without dead ends: 209 [2021-05-02 13:17:10,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2225 ImplicationChecksByTransitivity, 5662.4ms TimeCoverageRelationStatistics Valid=669, Invalid=17963, Unknown=0, NotChecked=0, Total=18632 [2021-05-02 13:17:10,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-02 13:17:10,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2021-05-02 13:17:10,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 203 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:10,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 221 transitions. [2021-05-02 13:17:10,989 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 221 transitions. Word has length 200 [2021-05-02 13:17:10,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:10,989 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 221 transitions. [2021-05-02 13:17:10,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 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) [2021-05-02 13:17:10,990 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 221 transitions. [2021-05-02 13:17:10,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-02 13:17:10,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:10,990 INFO L523 BasicCegarLoop]: trace histogram [65, 65, 53, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:11,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:17:11,191 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:11,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:11,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1283596980, now seen corresponding path program 34 times [2021-05-02 13:17:11,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:11,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336171809] [2021-05-02 13:17:11,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:11,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:12,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,857 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 1878 proven. 4240 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:17:12,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:12,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336171809] [2021-05-02 13:17:12,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336171809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:12,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219447071] [2021-05-02 13:17:12,857 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 [2021-05-02 13:17:12,929 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:17:12,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:12,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-02 13:17:12,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:13,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:13,244 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 1878 proven. 4240 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:17:13,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219447071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:13,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:13,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 13:17:13,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4739859] [2021-05-02 13:17:13,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:17:13,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:13,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:17:13,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:17:13,246 INFO L87 Difference]: Start difference. First operand 208 states and 221 transitions. Second operand has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:18,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:18,991 INFO L93 Difference]: Finished difference Result 253 states and 279 transitions. [2021-05-02 13:17:18,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 13:17:18,991 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 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 206 [2021-05-02 13:17:18,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:18,992 INFO L225 Difference]: With dead ends: 253 [2021-05-02 13:17:18,992 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 13:17:18,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1435 ImplicationChecksByTransitivity, 3893.6ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 13:17:18,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 13:17:18,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-05-02 13:17:18,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0679611650485437) internal successors, (220), 206 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:18,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 224 transitions. [2021-05-02 13:17:18,998 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 224 transitions. Word has length 206 [2021-05-02 13:17:18,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:18,998 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 224 transitions. [2021-05-02 13:17:18,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:18,999 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 224 transitions. [2021-05-02 13:17:18,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-02 13:17:18,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:18,999 INFO L523 BasicCegarLoop]: trace histogram [66, 66, 54, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:19,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:17:19,216 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:19,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:19,216 INFO L82 PathProgramCache]: Analyzing trace with hash -773449884, now seen corresponding path program 35 times [2021-05-02 13:17:19,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:19,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544086764] [2021-05-02 13:17:19,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:19,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:20,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:20,842 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 1913 proven. 4401 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:17:20,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:20,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544086764] [2021-05-02 13:17:20,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544086764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:20,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244293085] [2021-05-02 13:17:20,843 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