/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:06:05,349 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:06:05,350 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:06:05,382 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 19:06:05,403 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:06:05,404 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:06:05,404 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:06:05,405 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:06:05,430 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:06:05,431 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:06:05,432 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:06:05,432 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:06:05,432 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:06:05,432 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:06:05,433 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:06:05,433 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:06:05,434 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:06:05,434 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:06:05,434 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:06:05,434 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:06:05,434 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:06:05,435 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:06:05,435 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:06:05,732 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:06:05,745 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:06:05,747 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:06:05,748 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:06:05,748 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:06:05,749 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_2.c [2021-05-02 19:06:05,798 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/433d7365a/98d0c88faa1e42a99a4c3d05d1d90805/FLAGa5b9cc0f5 [2021-05-02 19:06:06,109 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:06:06,110 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_2.c [2021-05-02 19:06:06,114 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/433d7365a/98d0c88faa1e42a99a4c3d05d1d90805/FLAGa5b9cc0f5 [2021-05-02 19:06:06,551 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/433d7365a/98d0c88faa1e42a99a4c3d05d1d90805 [2021-05-02 19:06:06,552 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:06:06,554 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:06:06,558 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:06,558 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:06:06,561 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:06:06,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,563 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22e790a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06, skipping insertion in model container [2021-05-02 19:06:06,563 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,568 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:06:06,581 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:06:06,685 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_2.c[730,743] [2021-05-02 19:06:06,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:06,707 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:06:06,715 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_2.c[730,743] [2021-05-02 19:06:06,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:06,724 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:06:06,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06 WrapperNode [2021-05-02 19:06:06,724 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:06,725 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:06:06,725 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:06:06,725 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:06:06,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,736 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,736 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,739 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,741 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,742 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... [2021-05-02 19:06:06,779 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:06:06,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:06:06,780 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:06:06,780 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:06:06,787 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:06:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:06:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:06:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:06:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:06:06,854 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:06:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:06:06,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:06:07,094 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:06:07,095 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 19:06:07,096 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:07 BoogieIcfgContainer [2021-05-02 19:06:07,096 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:06:07,096 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:06:07,096 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:06:07,097 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:06:07,099 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:07" (1/1) ... [2021-05-02 19:06:07,120 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:07 BasicIcfg [2021-05-02 19:06:07,121 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:06:07,122 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:06:07,122 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:06:07,124 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:06:07,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:06:06" (1/4) ... [2021-05-02 19:06:07,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b79210e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:07, skipping insertion in model container [2021-05-02 19:06:07,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:06" (2/4) ... [2021-05-02 19:06:07,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b79210e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:07, skipping insertion in model container [2021-05-02 19:06:07,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:07" (3/4) ... [2021-05-02 19:06:07,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b79210e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:07, skipping insertion in model container [2021-05-02 19:06:07,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:07" (4/4) ... [2021-05-02 19:06:07,126 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_2.cJordan [2021-05-02 19:06:07,141 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:06:07,146 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:06:07,157 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:06:07,174 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:06:07,174 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:06:07,174 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:06:07,174 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:06:07,174 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:06:07,174 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:06:07,175 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:06:07,175 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:06:07,195 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:06:07,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:07,199 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:07,200 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:07,200 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:07,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:07,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1120438501, now seen corresponding path program 1 times [2021-05-02 19:06:07,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:07,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777985755] [2021-05-02 19:06:07,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:07,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:07,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777985755] [2021-05-02 19:06:07,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777985755] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:07,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:07,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:06:07,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354213535] [2021-05-02 19:06:07,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:06:07,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:07,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:06:07,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:07,398 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:07,420 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-05-02 19:06:07,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:06:07,422 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:07,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:07,426 INFO L225 Difference]: With dead ends: 18 [2021-05-02 19:06:07,426 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 19:06:07,427 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:07,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 19:06:07,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 19:06:07,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 19:06:07,446 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2021-05-02 19:06:07,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:07,446 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 19:06:07,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,446 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 19:06:07,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:07,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:07,447 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:07,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:06:07,447 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:07,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:07,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1120439462, now seen corresponding path program 1 times [2021-05-02 19:06:07,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:07,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112032706] [2021-05-02 19:06:07,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:07,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:07,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:07,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:07,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112032706] [2021-05-02 19:06:07,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112032706] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:07,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:07,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:07,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568438181] [2021-05-02 19:06:07,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:07,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:07,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:07,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:07,515 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:07,592 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-05-02 19:06:07,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:07,592 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:07,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:07,593 INFO L225 Difference]: With dead ends: 17 [2021-05-02 19:06:07,593 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 19:06:07,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:07,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 19:06:07,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 14. [2021-05-02 19:06:07,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 19:06:07,596 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-05-02 19:06:07,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:07,596 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 19:06:07,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,596 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 19:06:07,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 19:06:07,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:07,605 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:07,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 19:06:07,605 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:07,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:07,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1442269292, now seen corresponding path program 1 times [2021-05-02 19:06:07,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:07,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129488530] [2021-05-02 19:06:07,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:07,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:07,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:07,708 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:07,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129488530] [2021-05-02 19:06:07,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129488530] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:07,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:07,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:07,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148832439] [2021-05-02 19:06:07,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:07,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:07,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:07,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:07,710 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:07,754 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-05-02 19:06:07,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:07,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 19:06:07,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:07,756 INFO L225 Difference]: With dead ends: 16 [2021-05-02 19:06:07,756 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 19:06:07,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:07,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 19:06:07,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-05-02 19:06:07,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 19:06:07,759 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-05-02 19:06:07,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:07,759 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 19:06:07,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,759 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 19:06:07,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 19:06:07,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:07,760 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:07,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 19:06:07,760 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:07,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:07,760 INFO L82 PathProgramCache]: Analyzing trace with hash -2120336465, now seen corresponding path program 1 times [2021-05-02 19:06:07,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:07,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121085033] [2021-05-02 19:06:07,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:07,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:07,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:07,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:07,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121085033] [2021-05-02 19:06:07,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121085033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:07,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441931524] [2021-05-02 19:06:07,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:07,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:07,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:07,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:07,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:07,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:07,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:07,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441931524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:07,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:07,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:06:07,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415478033] [2021-05-02 19:06:07,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:06:07,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:07,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:06:07,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:06:07,897 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:07,983 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-05-02 19:06:07,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:06:07,984 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), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 19:06:07,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:07,984 INFO L225 Difference]: With dead ends: 18 [2021-05-02 19:06:07,984 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 19:06:07,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 75.2ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:07,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 19:06:07,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-02 19:06:07,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 19:06:07,987 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-02 19:06:07,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:07,987 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 19:06:07,987 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), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:07,987 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 19:06:07,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 19:06:07,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:07,987 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:08,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:08,216 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:08,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:08,216 INFO L82 PathProgramCache]: Analyzing trace with hash -907860726, now seen corresponding path program 2 times [2021-05-02 19:06:08,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:08,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991501605] [2021-05-02 19:06:08,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:08,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:08,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:08,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:06:08,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:08,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991501605] [2021-05-02 19:06:08,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [991501605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:08,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123300592] [2021-05-02 19:06:08,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:08,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:08,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:08,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:08,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:08,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:08,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:08,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:08,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:08,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123300592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:08,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:08,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 19:06:08,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725724631] [2021-05-02 19:06:08,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:08,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:08,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:08,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:08,430 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:08,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:08,777 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-02 19:06:08,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:06:08,777 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 19:06:08,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:08,778 INFO L225 Difference]: With dead ends: 39 [2021-05-02 19:06:08,778 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 19:06:08,778 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 314.7ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 19:06:08,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 19:06:08,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2021-05-02 19:06:08,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:08,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 19:06:08,781 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 16 [2021-05-02 19:06:08,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:08,781 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 19:06:08,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:08,782 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 19:06:08,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 19:06:08,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:08,782 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:08,998 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:08,998 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:08,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:08,999 INFO L82 PathProgramCache]: Analyzing trace with hash 58260358, now seen corresponding path program 3 times [2021-05-02 19:06:08,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:08,999 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60440723] [2021-05-02 19:06:08,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:09,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:09,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:09,051 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 19:06:09,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:09,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60440723] [2021-05-02 19:06:09,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60440723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:09,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024528241] [2021-05-02 19:06:09,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:09,102 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 19:06:09,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:09,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:09,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:09,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,153 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 19:06:09,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024528241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:09,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:09,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:09,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439686994] [2021-05-02 19:06:09,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:09,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:09,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:09,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:09,154 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:09,250 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 19:06:09,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:09,251 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 19:06:09,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:09,251 INFO L225 Difference]: With dead ends: 34 [2021-05-02 19:06:09,251 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 19:06:09,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 94.8ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:09,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 19:06:09,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-02 19:06:09,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 19:06:09,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2021-05-02 19:06:09,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:09,254 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 19:06:09,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,255 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 19:06:09,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 19:06:09,255 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:09,255 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:09,469 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:09,470 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:09,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:09,470 INFO L82 PathProgramCache]: Analyzing trace with hash -653057946, now seen corresponding path program 4 times [2021-05-02 19:06:09,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:09,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801188336] [2021-05-02 19:06:09,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:09,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:09,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:09,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:09,525 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 19:06:09,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:09,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801188336] [2021-05-02 19:06:09,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801188336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:09,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428245536] [2021-05-02 19:06:09,526 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:09,587 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:09,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:09,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:09,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:09,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:09,651 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 19:06:09,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428245536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:09,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:09,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:09,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584651545] [2021-05-02 19:06:09,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:09,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:09,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:09,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:09,653 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:09,774 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 19:06:09,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:09,774 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 19:06:09,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:09,775 INFO L225 Difference]: With dead ends: 38 [2021-05-02 19:06:09,775 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 19:06:09,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 122.2ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:09,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 19:06:09,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-02 19:06:09,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 19:06:09,779 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2021-05-02 19:06:09,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:09,779 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 19:06:09,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:09,779 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 19:06:09,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 19:06:09,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:09,780 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:09,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:10,000 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:10,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:10,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1670472390, now seen corresponding path program 5 times [2021-05-02 19:06:10,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:10,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354518215] [2021-05-02 19:06:10,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:10,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:10,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,104 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 19:06:10,105 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:10,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354518215] [2021-05-02 19:06:10,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354518215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:10,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660808636] [2021-05-02 19:06:10,105 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:10,144 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 19:06:10,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:10,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:10,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:10,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,215 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 19:06:10,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660808636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:10,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:10,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:06:10,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414327837] [2021-05-02 19:06:10,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:06:10,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:10,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:06:10,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:10,217 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:10,376 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-05-02 19:06:10,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:06:10,377 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 19:06:10,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:10,377 INFO L225 Difference]: With dead ends: 40 [2021-05-02 19:06:10,377 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 19:06:10,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 183.8ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:06:10,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 19:06:10,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 19:06:10,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 19:06:10,380 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-05-02 19:06:10,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:10,380 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 19:06:10,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,380 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 19:06:10,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 19:06:10,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:10,381 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:10,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:10,602 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:10,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:10,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1501846874, now seen corresponding path program 6 times [2021-05-02 19:06:10,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:10,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114372889] [2021-05-02 19:06:10,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:10,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:10,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,652 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 19:06:10,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:10,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114372889] [2021-05-02 19:06:10,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114372889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:10,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216760953] [2021-05-02 19:06:10,652 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:10,709 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 19:06:10,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:10,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:10,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:10,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:10,771 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 19:06:10,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216760953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:10,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:10,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:06:10,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468227619] [2021-05-02 19:06:10,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:06:10,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:10,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:06:10,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:06:10,773 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:10,849 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-05-02 19:06:10,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:06:10,849 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 19:06:10,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:10,853 INFO L225 Difference]: With dead ends: 69 [2021-05-02 19:06:10,853 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 19:06:10,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 66.0ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:10,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 19:06:10,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 55. [2021-05-02 19:06:10,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-02 19:06:10,865 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 39 [2021-05-02 19:06:10,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:10,866 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-02 19:06:10,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:10,866 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-02 19:06:10,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 19:06:10,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:10,887 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:11,103 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:11,104 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:11,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:11,104 INFO L82 PathProgramCache]: Analyzing trace with hash 2095360246, now seen corresponding path program 7 times [2021-05-02 19:06:11,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:11,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483956360] [2021-05-02 19:06:11,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:11,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:11,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:11,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:11,187 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-05-02 19:06:11,187 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:11,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483956360] [2021-05-02 19:06:11,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483956360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:11,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474829900] [2021-05-02 19:06:11,187 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:11,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:11,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:11,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:11,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,308 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-05-02 19:06:11,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474829900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:11,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:11,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:11,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120596858] [2021-05-02 19:06:11,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:11,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:11,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:11,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:11,310 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:11,407 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2021-05-02 19:06:11,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:11,408 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 19:06:11,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:11,408 INFO L225 Difference]: With dead ends: 84 [2021-05-02 19:06:11,408 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 19:06:11,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 87.8ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:11,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 19:06:11,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2021-05-02 19:06:11,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-05-02 19:06:11,411 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 54 [2021-05-02 19:06:11,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:11,412 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-05-02 19:06:11,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,412 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-05-02 19:06:11,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 19:06:11,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:11,413 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:11,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 19:06:11,628 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:11,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:11,628 INFO L82 PathProgramCache]: Analyzing trace with hash -802932570, now seen corresponding path program 8 times [2021-05-02 19:06:11,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:11,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233378813] [2021-05-02 19:06:11,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:11,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:11,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:11,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:11,690 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 0 proven. 526 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 19:06:11,690 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:11,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233378813] [2021-05-02 19:06:11,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233378813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:11,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021834900] [2021-05-02 19:06:11,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:11,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:11,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:11,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:11,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:11,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:11,845 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 0 proven. 526 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 19:06:11,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021834900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:11,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:11,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:11,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924117665] [2021-05-02 19:06:11,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:11,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:11,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:11,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:11,846 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:11,984 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2021-05-02 19:06:11,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:11,984 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 19:06:11,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:11,985 INFO L225 Difference]: With dead ends: 99 [2021-05-02 19:06:11,985 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 19:06:11,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 125.8ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:11,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 19:06:11,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 85. [2021-05-02 19:06:11,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 81 states have (on average 1.0740740740740742) internal successors, (87), 81 states have internal predecessors, (87), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 90 transitions. [2021-05-02 19:06:11,988 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 90 transitions. Word has length 69 [2021-05-02 19:06:11,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:11,988 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 90 transitions. [2021-05-02 19:06:11,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:11,989 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 90 transitions. [2021-05-02 19:06:11,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 19:06:11,989 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:11,989 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:12,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 19:06:12,207 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:12,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:12,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1178424054, now seen corresponding path program 9 times [2021-05-02 19:06:12,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:12,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190842968] [2021-05-02 19:06:12,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:12,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:12,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:12,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 0 proven. 875 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-02 19:06:12,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:12,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190842968] [2021-05-02 19:06:12,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190842968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:12,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964764382] [2021-05-02 19:06:12,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:12,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-05-02 19:06:12,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:12,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:12,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:12,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:12,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:12,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:12,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:12,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:12,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 360 proven. 0 refuted. 0 times theorem prover too weak. 695 trivial. 0 not checked. [2021-05-02 19:06:12,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964764382] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:12,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:06:12,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-05-02 19:06:12,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785146991] [2021-05-02 19:06:12,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:12,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:12,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:12,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:12,476 INFO L87 Difference]: Start difference. First operand 85 states and 90 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:12,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:12,489 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2021-05-02 19:06:12,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:12,490 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2021-05-02 19:06:12,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:12,490 INFO L225 Difference]: With dead ends: 83 [2021-05-02 19:06:12,490 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 19:06:12,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 80.0ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:12,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 19:06:12,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 19:06:12,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 19:06:12,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 19:06:12,491 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 84 [2021-05-02 19:06:12,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:12,491 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 19:06:12,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:12,491 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 19:06:12,491 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 19:06:12,707 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:12,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:12 BasicIcfg [2021-05-02 19:06:12,710 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 19:06:12,711 INFO L168 Benchmark]: Toolchain (without parser) took 6157.04 ms. Allocated memory was 169.9 MB in the beginning and 264.2 MB in the end (delta: 94.4 MB). Free memory was 136.4 MB in the beginning and 130.6 MB in the end (delta: 5.7 MB). Peak memory consumption was 99.6 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 169.9 MB. Free memory was 152.7 MB in the beginning and 152.6 MB in the end (delta: 93.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: CACSL2BoogieTranslator took 166.31 ms. Allocated memory is still 169.9 MB. Free memory was 136.2 MB in the beginning and 127.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: Boogie Preprocessor took 54.23 ms. Allocated memory is still 169.9 MB. Free memory was 127.1 MB in the beginning and 154.4 MB in the end (delta: -27.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: RCFGBuilder took 315.88 ms. Allocated memory is still 169.9 MB. Free memory was 154.4 MB in the beginning and 142.3 MB in the end (delta: 12.2 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: IcfgTransformer took 24.38 ms. Allocated memory is still 169.9 MB. Free memory was 141.7 MB in the beginning and 140.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,711 INFO L168 Benchmark]: TraceAbstraction took 5588.67 ms. Allocated memory was 169.9 MB in the beginning and 264.2 MB in the end (delta: 94.4 MB). Free memory was 140.2 MB in the beginning and 130.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 104.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:12,712 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 169.9 MB. Free memory was 152.7 MB in the beginning and 152.6 MB in the end (delta: 93.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 166.31 ms. Allocated memory is still 169.9 MB. Free memory was 136.2 MB in the beginning and 127.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 54.23 ms. Allocated memory is still 169.9 MB. Free memory was 127.1 MB in the beginning and 154.4 MB in the end (delta: -27.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * RCFGBuilder took 315.88 ms. Allocated memory is still 169.9 MB. Free memory was 154.4 MB in the beginning and 142.3 MB in the end (delta: 12.2 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * IcfgTransformer took 24.38 ms. Allocated memory is still 169.9 MB. Free memory was 141.7 MB in the beginning and 140.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5588.67 ms. Allocated memory was 169.9 MB in the beginning and 264.2 MB in the end (delta: 94.4 MB). Free memory was 140.2 MB in the beginning and 130.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 104.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 26]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5535.0ms, OverallIterations: 12, TraceHistogramMax: 30, EmptinessCheckTime: 42.1ms, AutomataDifference: 1317.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 16.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 132 SDtfs, 286 SDslu, 163 SDs, 0 SdLazy, 367 SolverSat, 76 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 295.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 492 GetRequests, 383 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1295.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=85occurred in iteration=11, InterpolantAutomatonStates: 82, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 44.2ms AutomataMinimizationTime, 12 MinimizatonAttempts, 62 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 73.5ms SsaConstructionTime, 240.9ms SatisfiabilityAnalysisTime, 1491.0ms InterpolantComputationTime, 768 NumberOfCodeBlocks, 689 NumberOfCodeBlocksAsserted, 58 NumberOfCheckSat, 747 ConstructedInterpolants, 0 QuantifiedInterpolants, 2025 SizeOfPredicates, 2 NumberOfNonLiveVariables, 970 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 21 InterpolantComputations, 4 PerfectInterpolantSequences, 2269/5009 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...