/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/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:39:26,596 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:39:26,598 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:39:26,655 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:39:26,696 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:39:26,696 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:39:26,697 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:39:26,702 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:39:26,725 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:39:26,725 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:39:26,726 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:39:26,727 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:39:26,728 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:39:26,728 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:39:26,728 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:39:26,729 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:39:26,729 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:39:27,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:39:27,083 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:39:27,085 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:39:27,086 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:39:27,087 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:39:27,088 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 17:39:27,132 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88287eea5/d1722c8e1750479b83af714958da5047/FLAGca0967130 [2021-05-02 17:39:27,531 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:39:27,532 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 17:39:27,536 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88287eea5/d1722c8e1750479b83af714958da5047/FLAGca0967130 [2021-05-02 17:39:27,554 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88287eea5/d1722c8e1750479b83af714958da5047 [2021-05-02 17:39:27,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:39:27,559 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:39:27,561 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:39:27,561 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:39:27,564 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:39:27,564 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ac4d689 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27, skipping insertion in model container [2021-05-02 17:39:27,565 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,570 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:39:27,584 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:39:27,714 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/sum04-1.i[808,821] [2021-05-02 17:39:27,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:39:27,729 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:39:27,738 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/sum04-1.i[808,821] [2021-05-02 17:39:27,742 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:39:27,753 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:39:27,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27 WrapperNode [2021-05-02 17:39:27,754 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:39:27,755 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:39:27,755 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:39:27,755 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:39:27,762 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,768 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,768 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,772 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,780 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (1/1) ... [2021-05-02 17:39:27,782 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:39:27,784 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:39:27,784 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:39:27,784 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:39:27,785 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (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 17:39:27,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:39:27,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:39:27,888 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:39:27,888 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:39:27,888 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:39:27,889 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:39:27,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:39:27,890 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:39:27,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:39:27,890 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:39:27,890 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:39:27,891 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:39:28,048 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:39:28,048 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:39:28,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:39:28 BoogieIcfgContainer [2021-05-02 17:39:28,049 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:39:28,050 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:39:28,050 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:39:28,051 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:39:28,053 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:39:28" (1/1) ... [2021-05-02 17:39:28,063 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:39:28 BasicIcfg [2021-05-02 17:39:28,064 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:39:28,065 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:39:28,065 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:39:28,067 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:39:28,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:39:27" (1/4) ... [2021-05-02 17:39:28,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@800667 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:39:28, skipping insertion in model container [2021-05-02 17:39:28,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:39:27" (2/4) ... [2021-05-02 17:39:28,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@800667 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:39:28, skipping insertion in model container [2021-05-02 17:39:28,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:39:28" (3/4) ... [2021-05-02 17:39:28,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@800667 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:39:28, skipping insertion in model container [2021-05-02 17:39:28,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:39:28" (4/4) ... [2021-05-02 17:39:28,069 INFO L111 eAbstractionObserver]: Analyzing ICFG sum04-1.iJordan [2021-05-02 17:39:28,072 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:39:28,074 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:39:28,098 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:39:28,110 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:39:28,110 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:39:28,110 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:39:28,110 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:39:28,110 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:39:28,110 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:39:28,110 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:39:28,110 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:39:28,118 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 17:39:28,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:39:28,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:28,123 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:28,123 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:28,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:28,127 INFO L82 PathProgramCache]: Analyzing trace with hash -423489079, now seen corresponding path program 1 times [2021-05-02 17:39:28,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:28,132 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720198344] [2021-05-02 17:39:28,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:28,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:28,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,285 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 17:39:28,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:28,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720198344] [2021-05-02 17:39:28,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720198344] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:39:28,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:39:28,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:39:28,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560850337] [2021-05-02 17:39:28,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:39:28,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:28,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:39:28,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:39:28,306 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:28,341 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 17:39:28,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:39:28,343 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:39:28,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:28,348 INFO L225 Difference]: With dead ends: 20 [2021-05-02 17:39:28,348 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 17:39:28,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:39:28,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 17:39:28,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 17:39:28,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 17:39:28,369 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 17:39:28,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:28,369 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 17:39:28,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,370 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 17:39:28,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:39:28,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:28,370 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:28,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:39:28,371 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:28,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:28,372 INFO L82 PathProgramCache]: Analyzing trace with hash -422565558, now seen corresponding path program 1 times [2021-05-02 17:39:28,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:28,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105445959] [2021-05-02 17:39:28,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:28,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,451 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 17:39:28,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:28,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105445959] [2021-05-02 17:39:28,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105445959] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:39:28,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:39:28,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:39:28,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235155507] [2021-05-02 17:39:28,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:39:28,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:28,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:39:28,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:39:28,454 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:28,516 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 17:39:28,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:39:28,517 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:39:28,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:28,518 INFO L225 Difference]: With dead ends: 17 [2021-05-02 17:39:28,518 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 17:39:28,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:39:28,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 17:39:28,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 17:39:28,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 17:39:28,524 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 17:39:28,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:28,524 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 17:39:28,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,525 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 17:39:28,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:39:28,526 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:28,526 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:28,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:39:28,527 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:28,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:28,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1744981802, now seen corresponding path program 1 times [2021-05-02 17:39:28,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:28,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673891881] [2021-05-02 17:39:28,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:28,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:28,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:28,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:28,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673891881] [2021-05-02 17:39:28,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673891881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:28,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740314415] [2021-05-02 17:39:28,625 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 17:39:28,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:28,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 17:39:28,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:28,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:28,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:28,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:28,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740314415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:28,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:28,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:39:28,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267220119] [2021-05-02 17:39:28,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:39:28,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:28,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:39:28,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:39:28,788 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:28,872 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 17:39:28,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:39:28,872 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 17:39:28,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:28,873 INFO L225 Difference]: With dead ends: 20 [2021-05-02 17:39:28,873 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 17:39:28,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 92.8ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:39:28,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 17:39:28,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 17:39:28,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 17:39:28,875 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 17:39:28,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:28,875 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 17:39:28,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:28,876 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 17:39:28,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:39:28,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:28,876 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:29,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:39:29,093 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:29,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:29,094 INFO L82 PathProgramCache]: Analyzing trace with hash -112300598, now seen corresponding path program 2 times [2021-05-02 17:39:29,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:29,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511078085] [2021-05-02 17:39:29,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:29,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:29,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 17:39:29,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:29,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511078085] [2021-05-02 17:39:29,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511078085] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:39:29,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:39:29,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 17:39:29,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631573791] [2021-05-02 17:39:29,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:39:29,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:29,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:39:29,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:39:29,171 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 17:39:29,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:29,235 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-02 17:39:29,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:39:29,235 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 17 [2021-05-02 17:39:29,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:29,236 INFO L225 Difference]: With dead ends: 23 [2021-05-02 17:39:29,236 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 17:39:29,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 52.0ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:39:29,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 17:39:29,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 17:39:29,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:29,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 17:39:29,238 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2021-05-02 17:39:29,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:29,238 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 17:39:29,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 17:39:29,239 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 17:39:29,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 17:39:29,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:29,239 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:29,239 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 17:39:29,239 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:29,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:29,240 INFO L82 PathProgramCache]: Analyzing trace with hash -523675753, now seen corresponding path program 1 times [2021-05-02 17:39:29,240 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:29,240 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004313117] [2021-05-02 17:39:29,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:29,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:29,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,288 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:29,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:29,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004313117] [2021-05-02 17:39:29,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004313117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:29,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016393669] [2021-05-02 17:39:29,289 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 17:39:29,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:39:29,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:29,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,384 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:29,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016393669] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:29,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:29,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:39:29,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246866421] [2021-05-02 17:39:29,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:39:29,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:29,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:39:29,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:39:29,386 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:29,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:29,477 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 17:39:29,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:39:29,477 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 17:39:29,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:29,478 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:39:29,478 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:39:29,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 73.6ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:39:29,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:39:29,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:39:29,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:29,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 17:39:29,488 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 17:39:29,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:29,488 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 17:39:29,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:29,488 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 17:39:29,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:39:29,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:29,489 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:29,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:29,705 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:29,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:29,706 INFO L82 PathProgramCache]: Analyzing trace with hash -2062709365, now seen corresponding path program 2 times [2021-05-02 17:39:29,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:29,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170507095] [2021-05-02 17:39:29,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:29,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:29,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:29,787 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:29,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:29,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170507095] [2021-05-02 17:39:29,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170507095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:29,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496532978] [2021-05-02 17:39:29,788 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:29,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:39:29,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:39:29,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 17:39:29,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:29,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:29,892 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:29,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496532978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:29,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:29,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 17:39:29,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382818046] [2021-05-02 17:39:29,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:39:29,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:29,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:39:29,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:39:29,894 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:30,021 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-05-02 17:39:30,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:39:30,022 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 17:39:30,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:30,023 INFO L225 Difference]: With dead ends: 29 [2021-05-02 17:39:30,024 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 17:39:30,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 131.4ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:39:30,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 17:39:30,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 17:39:30,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-02 17:39:30,026 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2021-05-02 17:39:30,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:30,027 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-02 17:39:30,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,027 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-02 17:39:30,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:39:30,027 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:30,027 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:30,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:30,241 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:30,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1461294134, now seen corresponding path program 3 times [2021-05-02 17:39:30,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:30,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822855135] [2021-05-02 17:39:30,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:30,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:30,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:30,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:30,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:30,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822855135] [2021-05-02 17:39:30,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822855135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:30,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382920483] [2021-05-02 17:39:30,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:39:30,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 17:39:30,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:39:30,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:39:30,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:30,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,418 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 17:39:30,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382920483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:30,419 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:30,419 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 9 [2021-05-02 17:39:30,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985241422] [2021-05-02 17:39:30,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:39:30,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:30,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:39:30,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:39:30,420 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:30,578 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-02 17:39:30,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:39:30,578 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 17:39:30,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:30,579 INFO L225 Difference]: With dead ends: 32 [2021-05-02 17:39:30,579 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 17:39:30,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 134.2ms TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:39:30,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 17:39:30,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2021-05-02 17:39:30,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-05-02 17:39:30,581 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 26 [2021-05-02 17:39:30,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:30,582 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-05-02 17:39:30,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:30,582 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-05-02 17:39:30,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:39:30,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:30,582 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:30,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:30,789 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:30,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:30,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1131050581, now seen corresponding path program 4 times [2021-05-02 17:39:30,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:30,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930246621] [2021-05-02 17:39:30,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:30,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:30,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:30,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:30,852 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:30,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:30,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930246621] [2021-05-02 17:39:30,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930246621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:30,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592099272] [2021-05-02 17:39:30,853 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:39:30,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:39:30,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:39:30,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 17:39:30,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:30,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:30,969 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:30,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592099272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:30,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:30,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:39:30,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169618760] [2021-05-02 17:39:30,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:39:30,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:30,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:39:30,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:39:30,971 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:31,149 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 17:39:31,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:39:31,150 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 17:39:31,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:31,150 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:39:31,150 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 17:39:31,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 161.7ms TimeCoverageRelationStatistics Valid=118, Invalid=188, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:39:31,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 17:39:31,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-02 17:39:31,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-02 17:39:31,153 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 29 [2021-05-02 17:39:31,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:31,153 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-02 17:39:31,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,154 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-02 17:39:31,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 17:39:31,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:31,154 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:31,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:31,357 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:31,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:31,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1865505770, now seen corresponding path program 5 times [2021-05-02 17:39:31,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:31,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056342929] [2021-05-02 17:39:31,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:31,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:31,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:39:31,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:39:31,443 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:31,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:39:31,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056342929] [2021-05-02 17:39:31,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056342929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:31,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128136602] [2021-05-02 17:39:31,444 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:39:31,478 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 17:39:31,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:39:31,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:39:31,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:31,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:31,546 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 37 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 17:39:31,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128136602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:31,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:31,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 11 [2021-05-02 17:39:31,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498146232] [2021-05-02 17:39:31,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:39:31,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:31,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:39:31,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:39:31,548 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:31,737 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-02 17:39:31,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:39:31,737 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 17:39:31,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:31,737 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:39:31,738 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 17:39:31,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 159.6ms TimeCoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:39:31,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 17:39:31,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 17:39:31,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-05-02 17:39:31,740 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 32 [2021-05-02 17:39:31,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:31,740 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-05-02 17:39:31,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:39:31,740 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-05-02 17:39:31,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:39:31,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:31,741 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:31,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:31,945 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:31,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:31,945 INFO L82 PathProgramCache]: Analyzing trace with hash 838331851, now seen corresponding path program 6 times [2021-05-02 17:39:31,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:31,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305014806] [2021-05-02 17:39:31,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:31,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 17:39:31,958 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 17:39:31,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 17:39:31,965 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 17:39:31,977 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 17:39:31,977 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 17:39:31,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 17:39:32,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:39:32 BasicIcfg [2021-05-02 17:39:32,007 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:39:32,008 INFO L168 Benchmark]: Toolchain (without parser) took 4448.80 ms. Allocated memory was 194.0 MB in the beginning and 243.3 MB in the end (delta: 49.3 MB). Free memory was 160.9 MB in the beginning and 217.2 MB in the end (delta: -56.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 194.0 MB. Free memory was 177.4 MB in the beginning and 177.3 MB in the end (delta: 100.7 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: CACSL2BoogieTranslator took 192.84 ms. Allocated memory is still 194.0 MB. Free memory was 160.7 MB in the beginning and 151.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: Boogie Preprocessor took 27.73 ms. Allocated memory is still 194.0 MB. Free memory was 151.3 MB in the beginning and 149.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: RCFGBuilder took 265.80 ms. Allocated memory is still 194.0 MB. Free memory was 149.8 MB in the beginning and 166.1 MB in the end (delta: -16.3 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: IcfgTransformer took 13.65 ms. Allocated memory is still 194.0 MB. Free memory was 166.1 MB in the beginning and 165.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L168 Benchmark]: TraceAbstraction took 3942.45 ms. Allocated memory was 194.0 MB in the beginning and 243.3 MB in the end (delta: 49.3 MB). Free memory was 164.5 MB in the beginning and 217.2 MB in the end (delta: -52.7 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:39:32,008 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 194.0 MB. Free memory was 177.4 MB in the beginning and 177.3 MB in the end (delta: 100.7 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 192.84 ms. Allocated memory is still 194.0 MB. Free memory was 160.7 MB in the beginning and 151.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 27.73 ms. Allocated memory is still 194.0 MB. Free memory was 151.3 MB in the beginning and 149.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 265.80 ms. Allocated memory is still 194.0 MB. Free memory was 149.8 MB in the beginning and 166.1 MB in the end (delta: -16.3 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. * IcfgTransformer took 13.65 ms. Allocated memory is still 194.0 MB. Free memory was 166.1 MB in the beginning and 165.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3942.45 ms. Allocated memory was 194.0 MB in the beginning and 243.3 MB in the end (delta: 49.3 MB). Free memory was 164.5 MB in the beginning and 217.2 MB in the end (delta: -52.7 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, sn=0; [L24] i=1 VAL [i=1, sn=0] [L24] COND TRUE i<=8 VAL [i=1, sn=0] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=1, sn=2] [L24] i++ VAL [i=2, sn=2] [L24] COND TRUE i<=8 VAL [i=2, sn=2] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=2, sn=4] [L24] i++ VAL [i=3, sn=4] [L24] COND TRUE i<=8 VAL [i=3, sn=4] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=3, sn=6] [L24] i++ VAL [i=4, sn=6] [L24] COND TRUE i<=8 VAL [i=4, sn=6] [L25] COND FALSE !(i<4) VAL [i=4, sn=6] [L24] i++ VAL [i=5, sn=6] [L24] COND TRUE i<=8 VAL [i=5, sn=6] [L25] COND FALSE !(i<4) VAL [i=5, sn=6] [L24] i++ VAL [i=6, sn=6] [L24] COND TRUE i<=8 VAL [i=6, sn=6] [L25] COND FALSE !(i<4) VAL [i=6, sn=6] [L24] i++ VAL [i=7, sn=6] [L24] COND TRUE i<=8 VAL [i=7, sn=6] [L25] COND FALSE !(i<4) VAL [i=7, sn=6] [L24] i++ VAL [i=8, sn=6] [L24] COND TRUE i<=8 VAL [i=8, sn=6] [L25] COND FALSE !(i<4) VAL [i=8, sn=6] [L24] i++ VAL [i=9, sn=6] [L24] COND FALSE !(i<=8) VAL [i=9, sn=6] [L28] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) VAL [\old(cond)=0] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3869.5ms, OverallIterations: 10, TraceHistogramMax: 8, EmptinessCheckTime: 12.4ms, AutomataDifference: 1031.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 102 SDtfs, 242 SDslu, 144 SDs, 0 SdLazy, 292 SolverSat, 84 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 274.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 251 GetRequests, 168 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 888.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=9, InterpolantAutomatonStates: 61, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 37.3ms AutomataMinimizationTime, 9 MinimizatonAttempts, 10 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 56.0ms SsaConstructionTime, 206.3ms SatisfiabilityAnalysisTime, 984.4ms InterpolantComputationTime, 362 NumberOfCodeBlocks, 357 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 312 ConstructedInterpolants, 0 QuantifiedInterpolants, 830 SizeOfPredicates, 0 NumberOfNonLiveVariables, 539 ConjunctsInSsa, 33 ConjunctsInUnsatCore, 15 InterpolantComputations, 3 PerfectInterpolantSequences, 87/387 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...