/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt7.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:01:42,205 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:01:42,207 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:01:42,246 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:01:42,247 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:01:42,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:01:42,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:01:42,278 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:01:42,280 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:01:42,285 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:01:42,287 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:01:42,290 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 19:01:42,291 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:01:42,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:01:42,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:01:42,301 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:01:42,302 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:01:42,303 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:01:42,305 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:01:42,307 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:01:42,313 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:01:42,315 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:01:42,316 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:01:42,317 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:01:42,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 19:01:42,334 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:01:42,335 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:01:42,339 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:01:42,345 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:01:42,372 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:01:42,372 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:01:42,377 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:01:42,378 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:01:42,378 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:01:42,378 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:01:42,378 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:01:42,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:01:42,379 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:01:42,379 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:01:42,380 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:01:42,380 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:01:42,380 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:01:42,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:01:42,381 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:01:42,381 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:01:42,381 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:01:42,381 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:01:42,381 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:01:42,382 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:01:42,382 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:01:42,383 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:01:42,383 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:01:42,763 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:01:42,788 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:01:42,791 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:01:42,793 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:01:42,794 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:01:42,795 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt7.c [2021-05-02 19:01:42,877 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1bb741300/10bac8cd91c44e96891019a351b282ad/FLAG27e1239e7 [2021-05-02 19:01:43,392 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:01:43,393 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt7.c [2021-05-02 19:01:43,410 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1bb741300/10bac8cd91c44e96891019a351b282ad/FLAG27e1239e7 [2021-05-02 19:01:43,742 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1bb741300/10bac8cd91c44e96891019a351b282ad [2021-05-02 19:01:43,750 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:01:43,755 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:01:43,764 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:01:43,764 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:01:43,770 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:01:43,771 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:01:43" (1/1) ... [2021-05-02 19:01:43,772 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1248e146 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:43, skipping insertion in model container [2021-05-02 19:01:43,773 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:01:43" (1/1) ... [2021-05-02 19:01:43,781 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:01:43,803 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:01:43,992 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/sumt7.c[403,416] [2021-05-02 19:01:44,030 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:01:44,044 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:01:44,061 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/sumt7.c[403,416] [2021-05-02 19:01:44,083 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:01:44,104 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:01:44,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44 WrapperNode [2021-05-02 19:01:44,105 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:01:44,106 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:01:44,107 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:01:44,107 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:01:44,121 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,122 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,145 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,146 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,151 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,156 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,157 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,159 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:01:44,172 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:01:44,172 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:01:44,173 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:01:44,174 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (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 19:01:44,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:01:44,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:01:44,311 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:01:44,311 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:01:44,311 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:01:44,312 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:01:44,312 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:01:44,313 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:01:44,313 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:01:44,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:01:44,314 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:01:44,314 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:01:44,314 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 19:01:44,315 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:01:44,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:01:44,315 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:01:44,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:01:44,315 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:01:44,316 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:01:44,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:01:44,750 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:01:44,751 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:01:44,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:01:44 BoogieIcfgContainer [2021-05-02 19:01:44,753 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:01:44,754 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:01:44,754 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:01:44,755 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:01:44,759 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:01:44" (1/1) ... [2021-05-02 19:01:44,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:01:44 BasicIcfg [2021-05-02 19:01:44,778 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:01:44,779 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:01:44,780 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:01:44,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:01:44,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:01:43" (1/4) ... [2021-05-02 19:01:44,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36db2e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:01:44, skipping insertion in model container [2021-05-02 19:01:44,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:01:44" (2/4) ... [2021-05-02 19:01:44,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36db2e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:01:44, skipping insertion in model container [2021-05-02 19:01:44,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:01:44" (3/4) ... [2021-05-02 19:01:44,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36db2e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:01:44, skipping insertion in model container [2021-05-02 19:01:44,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:01:44" (4/4) ... [2021-05-02 19:01:44,787 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt7.cJordan [2021-05-02 19:01:44,798 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:01:44,802 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:01:44,818 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:01:44,836 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:01:44,836 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:01:44,836 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:01:44,836 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:01:44,836 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:01:44,836 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:01:44,837 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:01:44,837 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:01:44,855 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 21 states have internal predecessors, (30), 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 19:01:44,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 19:01:44,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:44,867 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:44,867 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:44,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:44,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1652901201, now seen corresponding path program 1 times [2021-05-02 19:01:44,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:44,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974814144] [2021-05-02 19:01:44,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:45,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:45,665 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 30 [2021-05-02 19:01:45,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:45,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:45,785 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 19:01:45,785 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:45,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974814144] [2021-05-02 19:01:45,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974814144] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:01:45,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:01:45,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 19:01:45,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365325060] [2021-05-02 19:01:45,792 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:01:45,792 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:45,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:01:45,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:01:45,806 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 21 states have internal predecessors, (30), 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 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 19:01:46,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:46,416 INFO L93 Difference]: Finished difference Result 48 states and 63 transitions. [2021-05-02 19:01:46,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:01:46,419 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 19:01:46,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:46,427 INFO L225 Difference]: With dead ends: 48 [2021-05-02 19:01:46,427 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 19:01:46,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 722.5ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:01:46,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 19:01:46,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-05-02 19:01:46,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:46,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 19:01:46,462 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 14 [2021-05-02 19:01:46,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:46,463 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 19:01:46,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 19:01:46,463 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 19:01:46,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 19:01:46,464 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:46,464 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:46,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:01:46,465 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:46,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:46,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1241506881, now seen corresponding path program 1 times [2021-05-02 19:01:46,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:46,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902403952] [2021-05-02 19:01:46,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:46,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:46,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:46,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:46,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:46,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:46,672 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:46,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:46,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902403952] [2021-05-02 19:01:46,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902403952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:46,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121259356] [2021-05-02 19:01:46,673 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 19:01:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:46,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 19:01:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:47,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:47,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121259356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:47,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:47,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 11] total 14 [2021-05-02 19:01:47,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019902658] [2021-05-02 19:01:47,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 19:01:47,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:47,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 19:01:47,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:01:47,151 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:47,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:47,775 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-05-02 19:01:47,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:01:47,776 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-05-02 19:01:47,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:47,779 INFO L225 Difference]: With dead ends: 38 [2021-05-02 19:01:47,780 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 19:01:47,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 622.3ms TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-05-02 19:01:47,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 19:01:47,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 19:01:47,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:47,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-05-02 19:01:47,794 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 22 [2021-05-02 19:01:47,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:47,796 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-05-02 19:01:47,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:47,797 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-05-02 19:01:47,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 19:01:47,800 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:47,805 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:48,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:01:48,021 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:48,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:48,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1104836153, now seen corresponding path program 1 times [2021-05-02 19:01:48,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:48,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997207922] [2021-05-02 19:01:48,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:48,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:48,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:48,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:48,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:48,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:48,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:48,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:48,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997207922] [2021-05-02 19:01:48,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997207922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:48,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732506187] [2021-05-02 19:01:48,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:48,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:48,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 19:01:48,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:48,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:48,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:48,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:48,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:48,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:48,916 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:48,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732506187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:48,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:48,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 16 [2021-05-02 19:01:48,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418960595] [2021-05-02 19:01:48,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 19:01:48,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:48,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 19:01:48,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:01:48,921 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 16 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:49,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:49,831 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2021-05-02 19:01:49,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 19:01:49,832 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2021-05-02 19:01:49,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:49,833 INFO L225 Difference]: With dead ends: 50 [2021-05-02 19:01:49,833 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 19:01:49,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 859.4ms TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-05-02 19:01:49,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 19:01:49,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 19:01:49,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 40 states have (on average 1.175) internal successors, (47), 40 states have internal predecessors, (47), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:01:49,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2021-05-02 19:01:49,839 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 27 [2021-05-02 19:01:49,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:49,840 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2021-05-02 19:01:49,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:01:49,840 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2021-05-02 19:01:49,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 19:01:49,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:49,841 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:50,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:50,069 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:50,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:50,070 INFO L82 PathProgramCache]: Analyzing trace with hash 47786256, now seen corresponding path program 1 times [2021-05-02 19:01:50,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:50,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293222985] [2021-05-02 19:01:50,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:50,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:50,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:50,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:50,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:50,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:50,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:01:50,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:50,585 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:01:50,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:50,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293222985] [2021-05-02 19:01:50,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293222985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:50,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827898344] [2021-05-02 19:01:50,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:50,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:50,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 19:01:50,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:50,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:50,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:50,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:51,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:51,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:51,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:51,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:51,183 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 19:01:51,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827898344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:51,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:51,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2021-05-02 19:01:51,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396891615] [2021-05-02 19:01:51,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 19:01:51,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:51,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 19:01:51,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 19:01:51,186 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 18 states have internal predecessors, (52), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:01:52,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:52,151 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2021-05-02 19:01:52,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:01:52,153 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 18 states have internal predecessors, (52), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2021-05-02 19:01:52,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:52,154 INFO L225 Difference]: With dead ends: 62 [2021-05-02 19:01:52,154 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 19:01:52,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1077.2ms TimeCoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-05-02 19:01:52,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 19:01:52,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 19:01:52,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:01:52,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2021-05-02 19:01:52,163 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 40 [2021-05-02 19:01:52,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:52,163 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2021-05-02 19:01:52,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 18 states have internal predecessors, (52), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:01:52,164 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2021-05-02 19:01:52,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 19:01:52,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:52,165 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:52,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:52,383 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:52,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:52,384 INFO L82 PathProgramCache]: Analyzing trace with hash 286545211, now seen corresponding path program 1 times [2021-05-02 19:01:52,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:52,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220391819] [2021-05-02 19:01:52,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:52,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:52,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:52,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:52,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:52,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:01:52,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:52,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 19:01:52,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:52,985 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 6 proven. 37 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 19:01:52,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:52,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220391819] [2021-05-02 19:01:52,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220391819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:52,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812948116] [2021-05-02 19:01:52,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:53,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:53,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 19:01:53,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:53,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:53,644 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 19:01:53,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812948116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:53,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:53,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 24 [2021-05-02 19:01:53,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895013236] [2021-05-02 19:01:53,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 19:01:53,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:53,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 19:01:53,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=473, Unknown=0, NotChecked=0, Total=552 [2021-05-02 19:01:53,649 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 24 states, 22 states have (on average 3.0) internal successors, (66), 22 states have internal predecessors, (66), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 19:01:55,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:55,035 INFO L93 Difference]: Finished difference Result 73 states and 79 transitions. [2021-05-02 19:01:55,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 19:01:55,037 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 22 states have internal predecessors, (66), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 52 [2021-05-02 19:01:55,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:55,042 INFO L225 Difference]: With dead ends: 73 [2021-05-02 19:01:55,042 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 19:01:55,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 1356.4ms TimeCoverageRelationStatistics Valid=165, Invalid=1167, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 19:01:55,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 19:01:55,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 19:01:55,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:01:55,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 19:01:55,066 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 52 [2021-05-02 19:01:55,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:55,066 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 19:01:55,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 22 states have internal predecessors, (66), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 19:01:55,067 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 19:01:55,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 19:01:55,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:55,068 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:55,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:55,277 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:55,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:55,278 INFO L82 PathProgramCache]: Analyzing trace with hash -841871775, now seen corresponding path program 1 times [2021-05-02 19:01:55,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:55,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248015080] [2021-05-02 19:01:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:55,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:55,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:55,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:01:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 19:01:55,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 19:01:55,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,867 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 8 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 19:01:55,867 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:55,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248015080] [2021-05-02 19:01:55,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248015080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:55,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899898114] [2021-05-02 19:01:55,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:55,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 19:01:55,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:56,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:56,538 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 7 proven. 72 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 19:01:56,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899898114] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:56,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:56,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 28 [2021-05-02 19:01:56,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057182134] [2021-05-02 19:01:56,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 19:01:56,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:56,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 19:01:56,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2021-05-02 19:01:56,542 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 28 states, 26 states have (on average 3.0) internal successors, (78), 26 states have internal predecessors, (78), 11 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 19:01:57,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:57,851 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2021-05-02 19:01:57,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 19:01:57,851 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 3.0) internal successors, (78), 26 states have internal predecessors, (78), 11 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 63 [2021-05-02 19:01:57,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:57,853 INFO L225 Difference]: With dead ends: 83 [2021-05-02 19:01:57,853 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 19:01:57,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 1460.3ms TimeCoverageRelationStatistics Valid=210, Invalid=1596, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 19:01:57,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 19:01:57,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-02 19:01:57,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 19:01:57,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2021-05-02 19:01:57,860 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 63 [2021-05-02 19:01:57,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:57,860 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2021-05-02 19:01:57,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 26 states have (on average 3.0) internal successors, (78), 26 states have internal predecessors, (78), 11 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 19:01:57,861 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2021-05-02 19:01:57,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 19:01:57,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:57,863 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:58,089 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:58,089 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:58,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:58,089 INFO L82 PathProgramCache]: Analyzing trace with hash 959634736, now seen corresponding path program 1 times [2021-05-02 19:01:58,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:58,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135252415] [2021-05-02 19:01:58,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:58,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:58,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:01:58,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:01:58,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 19:01:58,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 19:01:58,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 19:01:58,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,676 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 19:01:58,676 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:58,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135252415] [2021-05-02 19:01:58,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135252415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:58,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782848201] [2021-05-02 19:01:58,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:01:58,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:58,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 19:01:58,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:58,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:58,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:58,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:58,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:59,420 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 9 proven. 103 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 19:01:59,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782848201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:59,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:59,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 32 [2021-05-02 19:01:59,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098119050] [2021-05-02 19:01:59,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 19:01:59,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:59,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 19:01:59,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2021-05-02 19:01:59,423 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand has 32 states, 30 states have (on average 2.933333333333333) internal successors, (88), 30 states have internal predecessors, (88), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 19:02:01,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:01,164 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2021-05-02 19:02:01,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 19:02:01,164 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.933333333333333) internal successors, (88), 30 states have internal predecessors, (88), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 73 [2021-05-02 19:02:01,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:01,166 INFO L225 Difference]: With dead ends: 92 [2021-05-02 19:02:01,166 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 19:02:01,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 651 ImplicationChecksByTransitivity, 1701.9ms TimeCoverageRelationStatistics Valid=261, Invalid=2091, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 19:02:01,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 19:02:01,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-02 19:02:01,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 19:02:01,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 98 transitions. [2021-05-02 19:02:01,174 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 98 transitions. Word has length 73 [2021-05-02 19:02:01,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:01,174 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 98 transitions. [2021-05-02 19:02:01,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 30 states have (on average 2.933333333333333) internal successors, (88), 30 states have internal predecessors, (88), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 19:02:01,175 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 98 transitions. [2021-05-02 19:02:01,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 19:02:01,176 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:01,176 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:01,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:01,385 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:01,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:01,386 INFO L82 PathProgramCache]: Analyzing trace with hash 431761263, now seen corresponding path program 1 times [2021-05-02 19:02:01,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:01,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700291384] [2021-05-02 19:02:01,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:01,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:02,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:02:02,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:02:02,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 19:02:02,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 19:02:02,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 19:02:02,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 19:02:02,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,053 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 12 proven. 119 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 19:02:02,054 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:02,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700291384] [2021-05-02 19:02:02,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700291384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:02,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317454626] [2021-05-02 19:02:02,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:02,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:02,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 19:02:02,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:02:02,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 11 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 19:02:02,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317454626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:02,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:02:02,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 36 [2021-05-02 19:02:02,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592644858] [2021-05-02 19:02:02,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 19:02:02,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:02:02,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 19:02:02,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1091, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 19:02:02,903 INFO L87 Difference]: Start difference. First operand 92 states and 98 transitions. Second operand has 36 states, 34 states have (on average 2.823529411764706) internal successors, (96), 34 states have internal predecessors, (96), 15 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 19:02:04,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:04,989 INFO L93 Difference]: Finished difference Result 109 states and 122 transitions. [2021-05-02 19:02:04,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 19:02:04,990 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 2.823529411764706) internal successors, (96), 34 states have internal predecessors, (96), 15 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 82 [2021-05-02 19:02:04,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:04,991 INFO L225 Difference]: With dead ends: 109 [2021-05-02 19:02:04,991 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 19:02:04,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 2039.0ms TimeCoverageRelationStatistics Valid=341, Invalid=2851, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 19:02:04,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 19:02:05,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 102. [2021-05-02 19:02:05,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 82 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 19:02:05,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2021-05-02 19:02:05,013 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 82 [2021-05-02 19:02:05,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:05,015 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2021-05-02 19:02:05,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 34 states have (on average 2.823529411764706) internal successors, (96), 34 states have internal predecessors, (96), 15 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 19:02:05,015 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2021-05-02 19:02:05,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 19:02:05,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:05,021 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 6, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:05,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:05,249 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:05,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:05,249 INFO L82 PathProgramCache]: Analyzing trace with hash 698566803, now seen corresponding path program 2 times [2021-05-02 19:02:05,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:05,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116750320] [2021-05-02 19:02:05,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:05,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:05,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 19:02:05,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 19:02:05,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 19:02:05,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 19:02:05,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 19:02:05,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 19:02:05,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2021-05-02 19:02:05,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2021-05-02 19:02:05,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:05,678 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 32 proven. 163 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 19:02:05,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:05,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116750320] [2021-05-02 19:02:05,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116750320] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:05,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515764913] [2021-05-02 19:02:05,679 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