/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/deep-nested.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:05:52,044 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:05:52,047 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:05:52,084 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 19:05:52,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:05:52,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:05:52,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:05:52,142 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:05:52,158 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:05:52,158 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:05:52,161 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:05:52,161 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:05:52,161 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:05:52,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:05:52,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:05:52,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:05:52,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:05:52,162 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:05:52,163 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:05:52,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:05:52,163 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:05:52,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:05:52,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:05:52,164 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:05:52,164 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:05:52,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:05:52,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:05:52,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:05:52,165 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:05:52,166 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:05:52,166 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:05:52,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:05:52,517 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:05:52,519 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:05:52,520 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:05:52,524 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:05:52,525 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-02 19:05:52,585 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fcd6db184/d20ce001f810406b91f709bd89d0048f/FLAGcb097398d [2021-05-02 19:05:53,052 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:05:53,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-02 19:05:53,059 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fcd6db184/d20ce001f810406b91f709bd89d0048f/FLAGcb097398d [2021-05-02 19:05:53,431 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fcd6db184/d20ce001f810406b91f709bd89d0048f [2021-05-02 19:05:53,434 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:05:53,435 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:05:53,436 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:05:53,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:05:53,444 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:05:53,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33834554 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53, skipping insertion in model container [2021-05-02 19:05:53,446 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,452 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:05:53,465 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:05:53,604 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/deep-nested.c[625,638] [2021-05-02 19:05:53,610 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:05:53,617 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:05:53,631 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/deep-nested.c[625,638] [2021-05-02 19:05:53,633 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:05:53,643 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:05:53,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53 WrapperNode [2021-05-02 19:05:53,644 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:05:53,645 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:05:53,645 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:05:53,645 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:05:53,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,659 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,663 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,668 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,669 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:05:53,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:05:53,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:05:53,671 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:05:53,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (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 19:05:53,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:05:53,736 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:05:53,736 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:05:53,736 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:05:53,736 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:05:53,736 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:05:53,736 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:05:53,736 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:05:53,736 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:05:53,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:05:53,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:05:53,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:05:53,737 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:05:53,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:05:53,928 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:05:53,929 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 19:05:53,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:05:53 BoogieIcfgContainer [2021-05-02 19:05:53,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:05:53,931 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:05:53,931 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:05:53,932 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:05:53,934 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:05:53" (1/1) ... [2021-05-02 19:05:53,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:05:53 BasicIcfg [2021-05-02 19:05:53,948 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:05:53,949 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:05:53,949 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:05:53,952 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:05:53,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:05:53" (1/4) ... [2021-05-02 19:05:53,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a98b97d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:05:53, skipping insertion in model container [2021-05-02 19:05:53,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:53" (2/4) ... [2021-05-02 19:05:53,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a98b97d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:05:53, skipping insertion in model container [2021-05-02 19:05:53,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:05:53" (3/4) ... [2021-05-02 19:05:53,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a98b97d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:05:53, skipping insertion in model container [2021-05-02 19:05:53,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:05:53" (4/4) ... [2021-05-02 19:05:53,954 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.cJordan [2021-05-02 19:05:53,959 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:05:53,962 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:05:53,977 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:05:53,994 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:05:53,994 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:05:53,994 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:05:53,994 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:05:53,994 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:05:53,994 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:05:53,995 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:05:53,995 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:05:54,006 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 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 19:05:54,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 19:05:54,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:05:54,013 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:05:54,013 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:05:54,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:05:54,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1734228324, now seen corresponding path program 1 times [2021-05-02 19:05:54,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:05:54,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530713353] [2021-05-02 19:05:54,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:05:54,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:54,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:05:54,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:54,397 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 19:05:54,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:05:54,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530713353] [2021-05-02 19:05:54,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530713353] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:05:54,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:05:54,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 19:05:54,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060431292] [2021-05-02 19:05:54,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 19:05:54,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:05:54,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 19:05:54,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:05:54,425 INFO L87 Difference]: Start difference. First operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 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 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 19:05:54,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:05:54,677 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-02 19:05:54,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:05:54,679 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 13 [2021-05-02 19:05:54,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:05:54,685 INFO L225 Difference]: With dead ends: 27 [2021-05-02 19:05:54,686 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 19:05:54,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 171.3ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:05:54,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 19:05:54,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 19:05:54,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 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 19:05:54,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 19:05:54,717 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2021-05-02 19:05:54,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:05:54,718 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 19:05:54,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 19:05:54,718 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 19:05:54,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 19:05:54,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:05:54,722 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:05:54,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:05:54,722 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:05:54,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:05:54,724 INFO L82 PathProgramCache]: Analyzing trace with hash 235486120, now seen corresponding path program 1 times [2021-05-02 19:05:54,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:05:54,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228317880] [2021-05-02 19:05:54,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:05:54,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:54,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:05:54,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:05:54,946 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:05:54,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228317880] [2021-05-02 19:05:54,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228317880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:54,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544183188] [2021-05-02 19:05:54,946 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 19:05:55,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:55,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 19:05:55,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:05:55,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:05:55,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544183188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:55,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:05:55,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 19:05:55,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383443700] [2021-05-02 19:05:55,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:05:55,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:05:55,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:05:55,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:05:55,127 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 19:05:55,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:05:55,820 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2021-05-02 19:05:55,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 19:05:55,821 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 19:05:55,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:05:55,823 INFO L225 Difference]: With dead ends: 58 [2021-05-02 19:05:55,824 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 19:05:55,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 485.9ms TimeCoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:05:55,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 19:05:55,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 29. [2021-05-02 19:05:55,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 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 19:05:55,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-05-02 19:05:55,836 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 16 [2021-05-02 19:05:55,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:05:55,837 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-05-02 19:05:55,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 19:05:55,837 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-05-02 19:05:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 19:05:55,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:05:55,840 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:05:56,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:05:56,053 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:05:56,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:05:56,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1548678733, now seen corresponding path program 1 times [2021-05-02 19:05:56,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:05:56,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23291336] [2021-05-02 19:05:56,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:05:56,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:56,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:05:56,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:56,282 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 19:05:56,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:05:56,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23291336] [2021-05-02 19:05:56,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23291336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:56,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102530952] [2021-05-02 19:05:56,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:05:56,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:56,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 19:05:56,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:05:56,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:05:56,486 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 19:05:56,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102530952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:56,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:05:56,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-05-02 19:05:56,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079520081] [2021-05-02 19:05:56,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 19:05:56,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:05:56,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 19:05:56,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:05:56,488 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 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 19:05:57,046 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 53 [2021-05-02 19:05:57,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:05:57,600 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2021-05-02 19:05:57,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 19:05:57,601 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 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 25 [2021-05-02 19:05:57,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:05:57,601 INFO L225 Difference]: With dead ends: 69 [2021-05-02 19:05:57,601 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 19:05:57,602 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 1013.5ms TimeCoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2021-05-02 19:05:57,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 19:05:57,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2021-05-02 19:05:57,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 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 19:05:57,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-05-02 19:05:57,606 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 25 [2021-05-02 19:05:57,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:05:57,606 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-05-02 19:05:57,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 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 19:05:57,606 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-05-02 19:05:57,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 19:05:57,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:05:57,607 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:05:57,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:05:57,823 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:05:57,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:05:57,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1748738099, now seen corresponding path program 2 times [2021-05-02 19:05:57,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:05:57,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898719415] [2021-05-02 19:05:57,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:05:57,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:58,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:05:58,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:58,031 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 19:05:58,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:05:58,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898719415] [2021-05-02 19:05:58,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898719415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:58,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211591523] [2021-05-02 19:05:58,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:05:58,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-02 19:05:58,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:05:58,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 19:05:58,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:05:58,231 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 19:05:58,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211591523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:05:58,232 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:05:58,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 19:05:58,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117530494] [2021-05-02 19:05:58,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:05:58,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:05:58,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:05:58,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:05:58,234 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 19:05:58,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:05:58,274 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-05-02 19:05:58,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:05:58,274 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 31 [2021-05-02 19:05:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:05:58,276 INFO L225 Difference]: With dead ends: 62 [2021-05-02 19:05:58,277 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 19:05:58,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 92.6ms TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:05:58,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 19:05:58,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2021-05-02 19:05:58,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 49 states have internal predecessors, (59), 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 19:05:58,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 19:05:58,288 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 31 [2021-05-02 19:05:58,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:05:58,288 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 19:05:58,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 19:05:58,288 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 19:05:58,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 19:05:58,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:05:58,290 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:05:58,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:05:58,513 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:05:58,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:05:58,513 INFO L82 PathProgramCache]: Analyzing trace with hash -856374126, now seen corresponding path program 1 times [2021-05-02 19:05:58,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:05:58,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360283215] [2021-05-02 19:05:58,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:05:58,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:58,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:05:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:58,724 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 19:05:58,724 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:05:58,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360283215] [2021-05-02 19:05:58,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360283215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:58,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72477414] [2021-05-02 19:05:58,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:05:58,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:05:58,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 19:05:58,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:05:58,960 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 19:05:58,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72477414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:05:58,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:05:58,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 19:05:58,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469493629] [2021-05-02 19:05:58,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:05:58,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:05:58,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:05:58,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:05:58,963 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 states have internal predecessors, (41), 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 19:06:00,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:00,504 INFO L93 Difference]: Finished difference Result 184 states and 211 transitions. [2021-05-02 19:06:00,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 19:06:00,504 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 states have internal predecessors, (41), 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 34 [2021-05-02 19:06:00,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:00,508 INFO L225 Difference]: With dead ends: 184 [2021-05-02 19:06:00,513 INFO L226 Difference]: Without dead ends: 166 [2021-05-02 19:06:00,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1333.5ms TimeCoverageRelationStatistics Valid=266, Invalid=856, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 19:06:00,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-02 19:06:00,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 90. [2021-05-02 19:06:00,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 86 states have (on average 1.197674418604651) internal successors, (103), 86 states have internal predecessors, (103), 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 19:06:00,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 106 transitions. [2021-05-02 19:06:00,530 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 106 transitions. Word has length 34 [2021-05-02 19:06:00,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:00,531 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 106 transitions. [2021-05-02 19:06:00,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 states have internal predecessors, (41), 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 19:06:00,531 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 106 transitions. [2021-05-02 19:06:00,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 19:06:00,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:00,532 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:00,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:00,757 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:00,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:00,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1215155283, now seen corresponding path program 1 times [2021-05-02 19:06:00,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:00,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313680136] [2021-05-02 19:06:00,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:00,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:00,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,927 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 19:06:00,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:00,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313680136] [2021-05-02 19:06:00,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313680136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:00,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948159455] [2021-05-02 19:06:00,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:00,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 19:06:00,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:01,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,136 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 19:06:01,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948159455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:01,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 19:06:01,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558970983] [2021-05-02 19:06:01,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:06:01,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:01,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:06:01,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:01,139 INFO L87 Difference]: Start difference. First operand 90 states and 106 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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 19:06:02,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:02,484 INFO L93 Difference]: Finished difference Result 261 states and 300 transitions. [2021-05-02 19:06:02,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 19:06:02,484 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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 46 [2021-05-02 19:06:02,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:02,486 INFO L225 Difference]: With dead ends: 261 [2021-05-02 19:06:02,486 INFO L226 Difference]: Without dead ends: 245 [2021-05-02 19:06:02,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 1152.1ms TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 19:06:02,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-02 19:06:02,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 125. [2021-05-02 19:06:02,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.1818181818181819) internal successors, (143), 121 states have internal predecessors, (143), 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 19:06:02,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 146 transitions. [2021-05-02 19:06:02,493 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 146 transitions. Word has length 46 [2021-05-02 19:06:02,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:02,493 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 146 transitions. [2021-05-02 19:06:02,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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 19:06:02,494 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 146 transitions. [2021-05-02 19:06:02,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 19:06:02,496 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:02,496 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 7, 6, 6, 6, 5, 5, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:02,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 19:06:02,720 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:02,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:02,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1570129573, now seen corresponding path program 1 times [2021-05-02 19:06:02,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:02,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935807244] [2021-05-02 19:06:02,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:02,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:03,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:03,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:03,129 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 28 proven. 226 refuted. 0 times theorem prover too weak. 664 trivial. 0 not checked. [2021-05-02 19:06:03,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:03,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935807244] [2021-05-02 19:06:03,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935807244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:03,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886706027] [2021-05-02 19:06:03,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:03,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:03,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 19:06:03,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:03,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:03,503 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 416 proven. 60 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 19:06:03,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886706027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:03,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:03,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 19:06:03,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195762679] [2021-05-02 19:06:03,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 19:06:03,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:03,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 19:06:03,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:06:03,508 INFO L87 Difference]: Start difference. First operand 125 states and 146 transitions. Second operand has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 19:06:05,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:05,600 INFO L93 Difference]: Finished difference Result 525 states and 577 transitions. [2021-05-02 19:06:05,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 19:06:05,600 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 124 [2021-05-02 19:06:05,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:05,602 INFO L225 Difference]: With dead ends: 525 [2021-05-02 19:06:05,602 INFO L226 Difference]: Without dead ends: 483 [2021-05-02 19:06:05,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1771.6ms TimeCoverageRelationStatistics Valid=311, Invalid=1411, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 19:06:05,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-02 19:06:05,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 319. [2021-05-02 19:06:05,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 315 states have (on average 1.1365079365079365) internal successors, (358), 315 states have internal predecessors, (358), 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 19:06:05,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 361 transitions. [2021-05-02 19:06:05,616 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 361 transitions. Word has length 124 [2021-05-02 19:06:05,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:05,617 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 361 transitions. [2021-05-02 19:06:05,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 19:06:05,617 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 361 transitions. [2021-05-02 19:06:05,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-05-02 19:06:05,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:05,621 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 57, 12, 11, 11, 11, 10, 10, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:05,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:05,837 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:05,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:05,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1736457987, now seen corresponding path program 2 times [2021-05-02 19:06:05,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:05,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929515383] [2021-05-02 19:06:05,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:06,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:06,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:06,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:06,453 INFO L134 CoverageAnalysis]: Checked inductivity of 6222 backedges. 53 proven. 990 refuted. 0 times theorem prover too weak. 5179 trivial. 0 not checked. [2021-05-02 19:06:06,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:06,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929515383] [2021-05-02 19:06:06,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929515383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:06,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921641425] [2021-05-02 19:06:06,455 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 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 19:06:06,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:06,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:06,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 19:06:06,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:06,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 6222 backedges. 985 proven. 18 refuted. 0 times theorem prover too weak. 5219 trivial. 0 not checked. [2021-05-02 19:06:07,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921641425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:07,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:07,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 17 [2021-05-02 19:06:07,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643234161] [2021-05-02 19:06:07,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 19:06:07,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:07,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 19:06:07,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:06:07,017 INFO L87 Difference]: Start difference. First operand 319 states and 361 transitions. Second operand has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 states have internal predecessors, (73), 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 19:06:07,715 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 52 [2021-05-02 19:06:09,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:09,191 INFO L93 Difference]: Finished difference Result 1141 states and 1215 transitions. [2021-05-02 19:06:09,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 19:06:09,192 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 states have internal predecessors, (73), 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 280 [2021-05-02 19:06:09,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:09,198 INFO L225 Difference]: With dead ends: 1141 [2021-05-02 19:06:09,198 INFO L226 Difference]: Without dead ends: 1045 [2021-05-02 19:06:09,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1874.5ms TimeCoverageRelationStatistics Valid=322, Invalid=1400, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 19:06:09,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1045 states. [2021-05-02 19:06:09,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1045 to 623. [2021-05-02 19:06:09,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 619 states have (on average 1.0775444264943457) internal successors, (667), 619 states have internal predecessors, (667), 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 19:06:09,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 670 transitions. [2021-05-02 19:06:09,215 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 670 transitions. Word has length 280 [2021-05-02 19:06:09,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:09,216 INFO L480 AbstractCegarLoop]: Abstraction has 623 states and 670 transitions. [2021-05-02 19:06:09,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 states have internal predecessors, (73), 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 19:06:09,216 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 670 transitions. [2021-05-02 19:06:09,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 623 [2021-05-02 19:06:09,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:09,227 INFO L523 BasicCegarLoop]: trace histogram [161, 160, 160, 23, 22, 22, 11, 10, 10, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:09,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:09,441 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:09,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:09,441 INFO L82 PathProgramCache]: Analyzing trace with hash -969028136, now seen corresponding path program 3 times [2021-05-02 19:06:09,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:09,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131455644] [2021-05-02 19:06:09,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:10,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:10,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:10,790 INFO L134 CoverageAnalysis]: Checked inductivity of 43353 backedges. 64 proven. 3772 refuted. 0 times theorem prover too weak. 39517 trivial. 0 not checked. [2021-05-02 19:06:10,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:10,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131455644] [2021-05-02 19:06:10,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131455644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:10,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43715782] [2021-05-02 19:06:10,791 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 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 19:06:10,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:06:10,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:10,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 19:06:10,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:11,976 INFO L134 CoverageAnalysis]: Checked inductivity of 43353 backedges. 14589 proven. 956 refuted. 0 times theorem prover too weak. 27808 trivial. 0 not checked. [2021-05-02 19:06:11,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43715782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:11,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:11,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2021-05-02 19:06:11,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607800234] [2021-05-02 19:06:11,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 19:06:11,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:11,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 19:06:11,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:06:11,981 INFO L87 Difference]: Start difference. First operand 623 states and 670 transitions. Second operand has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 19:06:14,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:14,343 INFO L93 Difference]: Finished difference Result 2636 states and 2741 transitions. [2021-05-02 19:06:14,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 19:06:14,343 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 622 [2021-05-02 19:06:14,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:14,352 INFO L225 Difference]: With dead ends: 2636 [2021-05-02 19:06:14,352 INFO L226 Difference]: Without dead ends: 2636 [2021-05-02 19:06:14,353 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 621 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 2112.4ms TimeCoverageRelationStatistics Valid=433, Invalid=1729, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 19:06:14,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2021-05-02 19:06:14,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 1394. [2021-05-02 19:06:14,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1390 states have (on average 1.056115107913669) internal successors, (1468), 1390 states have internal predecessors, (1468), 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 19:06:14,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 1471 transitions. [2021-05-02 19:06:14,388 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 1471 transitions. Word has length 622 [2021-05-02 19:06:14,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:14,389 INFO L480 AbstractCegarLoop]: Abstraction has 1394 states and 1471 transitions. [2021-05-02 19:06:14,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 19:06:14,389 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 1471 transitions. [2021-05-02 19:06:14,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1394 [2021-05-02 19:06:14,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:14,437 INFO L523 BasicCegarLoop]: trace histogram [388, 387, 387, 43, 42, 42, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:14,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 19:06:14,653 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:14,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:14,654 INFO L82 PathProgramCache]: Analyzing trace with hash 457705590, now seen corresponding path program 4 times [2021-05-02 19:06:14,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:14,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745465578] [2021-05-02 19:06:14,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:18,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,721 INFO L134 CoverageAnalysis]: Checked inductivity of 245549 backedges. 104 proven. 11508 refuted. 0 times theorem prover too weak. 233937 trivial. 0 not checked. [2021-05-02 19:06:18,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:18,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745465578] [2021-05-02 19:06:18,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745465578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:18,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037130159] [2021-05-02 19:06:18,722 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 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 19:06:19,195 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:19,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:19,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 2087 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 19:06:19,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:19,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,799 INFO L134 CoverageAnalysis]: Checked inductivity of 245549 backedges. 21804 proven. 320 refuted. 0 times theorem prover too weak. 223425 trivial. 0 not checked. [2021-05-02 19:06:20,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037130159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:20,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:20,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2021-05-02 19:06:20,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324788280] [2021-05-02 19:06:20,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 19:06:20,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:20,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 19:06:20,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2021-05-02 19:06:20,802 INFO L87 Difference]: Start difference. First operand 1394 states and 1471 transitions. Second operand has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 19:06:25,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:25,465 INFO L93 Difference]: Finished difference Result 3317 states and 3438 transitions. [2021-05-02 19:06:25,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 19:06:25,465 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 1393 [2021-05-02 19:06:25,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:25,475 INFO L225 Difference]: With dead ends: 3317 [2021-05-02 19:06:25,475 INFO L226 Difference]: Without dead ends: 3213 [2021-05-02 19:06:25,476 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1459 GetRequests, 1390 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 3877.4ms TimeCoverageRelationStatistics Valid=635, Invalid=4335, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 19:06:25,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3213 states. [2021-05-02 19:06:25,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3213 to 2405. [2021-05-02 19:06:25,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2405 states, 2401 states have (on average 1.0412328196584757) internal successors, (2500), 2401 states have internal predecessors, (2500), 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 19:06:25,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2405 states to 2405 states and 2503 transitions. [2021-05-02 19:06:25,521 INFO L78 Accepts]: Start accepts. Automaton has 2405 states and 2503 transitions. Word has length 1393 [2021-05-02 19:06:25,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:25,523 INFO L480 AbstractCegarLoop]: Abstraction has 2405 states and 2503 transitions. [2021-05-02 19:06:25,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 19:06:25,523 INFO L276 IsEmpty]: Start isEmpty. Operand 2405 states and 2503 transitions. [2021-05-02 19:06:25,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2405 [2021-05-02 19:06:25,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:25,564 INFO L523 BasicCegarLoop]: trace histogram [704, 703, 703, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:25,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:25,777 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:25,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:25,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1964311489, now seen corresponding path program 5 times [2021-05-02 19:06:25,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:25,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859662496] [2021-05-02 19:06:25,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:30,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:32,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:32,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:32,333 INFO L134 CoverageAnalysis]: Checked inductivity of 794140 backedges. 125 proven. 25163 refuted. 0 times theorem prover too weak. 768852 trivial. 0 not checked. [2021-05-02 19:06:32,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:32,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859662496] [2021-05-02 19:06:32,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859662496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:32,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130650886] [2021-05-02 19:06:32,334 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:11:26,066 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2021-05-02 19:11:26,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:11:26,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 19:11:26,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:11:27,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:11:29,721 INFO L134 CoverageAnalysis]: Checked inductivity of 794140 backedges. 199381 proven. 1519 refuted. 0 times theorem prover too weak. 593240 trivial. 0 not checked. [2021-05-02 19:11:29,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130650886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:11:29,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:11:29,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 32] total 48 [2021-05-02 19:11:29,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719714891] [2021-05-02 19:11:29,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 19:11:29,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:11:29,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 19:11:29,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2112, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 19:11:29,725 INFO L87 Difference]: Start difference. First operand 2405 states and 2503 transitions. Second operand has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 19:11:34,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:11:34,731 INFO L93 Difference]: Finished difference Result 3702 states and 3807 transitions. [2021-05-02 19:11:34,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 19:11:34,732 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 2404 [2021-05-02 19:11:34,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:11:34,744 INFO L225 Difference]: With dead ends: 3702 [2021-05-02 19:11:34,744 INFO L226 Difference]: Without dead ends: 3410 [2021-05-02 19:11:34,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2472 GetRequests, 2378 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 4860.3ms TimeCoverageRelationStatistics Valid=665, Invalid=8077, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 19:11:34,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3410 states. [2021-05-02 19:11:34,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3410 to 2663. [2021-05-02 19:11:34,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2663 states, 2659 states have (on average 1.037232042121098) internal successors, (2758), 2659 states have internal predecessors, (2758), 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 19:11:34,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2663 states to 2663 states and 2761 transitions. [2021-05-02 19:11:34,797 INFO L78 Accepts]: Start accepts. Automaton has 2663 states and 2761 transitions. Word has length 2404 [2021-05-02 19:11:34,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:11:34,798 INFO L480 AbstractCegarLoop]: Abstraction has 2663 states and 2761 transitions. [2021-05-02 19:11:34,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 19:11:34,798 INFO L276 IsEmpty]: Start isEmpty. Operand 2663 states and 2761 transitions. [2021-05-02 19:11:34,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2663 [2021-05-02 19:11:34,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:11:34,848 INFO L523 BasicCegarLoop]: trace histogram [790, 789, 789, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:11:35,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:11:35,066 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:11:35,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:11:35,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1716090277, now seen corresponding path program 6 times [2021-05-02 19:11:35,067 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:11:35,067 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402919845] [2021-05-02 19:11:35,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:11:41,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:11:43,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:11:43,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:11:43,923 INFO L134 CoverageAnalysis]: Checked inductivity of 992069 backedges. 125 proven. 30567 refuted. 0 times theorem prover too weak. 961377 trivial. 0 not checked. [2021-05-02 19:11:43,924 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:11:43,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402919845] [2021-05-02 19:11:43,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402919845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:11:43,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917248618] [2021-05-02 19:11:43,924 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:11:54,237 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 19:11:54,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:11:54,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 19:11:54,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:11:58,760 INFO L134 CoverageAnalysis]: Checked inductivity of 992069 backedges. 502138 proven. 353 refuted. 0 times theorem prover too weak. 489578 trivial. 0 not checked. [2021-05-02 19:11:58,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917248618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:11:58,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:11:58,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 34 [2021-05-02 19:11:58,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268013483] [2021-05-02 19:11:58,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 19:11:58,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:11:58,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 19:11:58,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=952, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 19:11:58,766 INFO L87 Difference]: Start difference. First operand 2663 states and 2761 transitions. Second operand has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 19:11:59,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:11:59,951 INFO L93 Difference]: Finished difference Result 3111 states and 3209 transitions. [2021-05-02 19:11:59,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 19:11:59,951 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 2662 [2021-05-02 19:11:59,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:11:59,960 INFO L225 Difference]: With dead ends: 3111 [2021-05-02 19:11:59,961 INFO L226 Difference]: Without dead ends: 3111 [2021-05-02 19:11:59,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2698 GetRequests, 2645 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 1417.5ms TimeCoverageRelationStatistics Valid=359, Invalid=2091, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 19:11:59,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3111 states. [2021-05-02 19:11:59,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3111 to 2984. [2021-05-02 19:12:00,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2984 states, 2980 states have (on average 1.0332214765100671) internal successors, (3079), 2980 states have internal predecessors, (3079), 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 19:12:00,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2984 states to 2984 states and 3082 transitions. [2021-05-02 19:12:00,009 INFO L78 Accepts]: Start accepts. Automaton has 2984 states and 3082 transitions. Word has length 2662 [2021-05-02 19:12:00,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:12:00,011 INFO L480 AbstractCegarLoop]: Abstraction has 2984 states and 3082 transitions. [2021-05-02 19:12:00,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 19:12:00,011 INFO L276 IsEmpty]: Start isEmpty. Operand 2984 states and 3082 transitions. [2021-05-02 19:12:00,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2984 [2021-05-02 19:12:00,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:12:00,072 INFO L523 BasicCegarLoop]: trace histogram [897, 896, 896, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:12:00,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 19:12:00,283 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:12:00,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:12:00,284 INFO L82 PathProgramCache]: Analyzing trace with hash 104421489, now seen corresponding path program 7 times [2021-05-02 19:12:00,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:12:00,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202858035] [2021-05-02 19:12:00,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:12:07,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:12:09,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:12:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:12:09,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1269306 backedges. 125 proven. 40054 refuted. 0 times theorem prover too weak. 1229127 trivial. 0 not checked. [2021-05-02 19:12:09,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:12:09,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202858035] [2021-05-02 19:12:09,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202858035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:12:09,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528477616] [2021-05-02 19:12:09,945 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:12:10,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:12:10,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 4249 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 19:12:10,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:12:11,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:12:13,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1269306 backedges. 215883 proven. 5873 refuted. 0 times theorem prover too weak. 1047550 trivial. 0 not checked. [2021-05-02 19:12:13,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528477616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:12:13,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:12:13,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 9] total 28 [2021-05-02 19:12:13,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935371123] [2021-05-02 19:12:13,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 19:12:13,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:12:13,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 19:12:13,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=670, Unknown=0, NotChecked=0, Total=756 [2021-05-02 19:12:13,848 INFO L87 Difference]: Start difference. First operand 2984 states and 3082 transitions. Second operand has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 19:12:15,827 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 52 [2021-05-02 19:12:17,780 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 51 [2021-05-02 19:12:21,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:12:21,417 INFO L93 Difference]: Finished difference Result 6625 states and 6803 transitions. [2021-05-02 19:12:21,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 19:12:21,418 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 2983 [2021-05-02 19:12:21,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:12:21,437 INFO L225 Difference]: With dead ends: 6625 [2021-05-02 19:12:21,437 INFO L226 Difference]: Without dead ends: 6523 [2021-05-02 19:12:21,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3074 GetRequests, 2980 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2531 ImplicationChecksByTransitivity, 6293.5ms TimeCoverageRelationStatistics Valid=915, Invalid=8205, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 19:12:21,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6523 states. [2021-05-02 19:12:21,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6523 to 6221. [2021-05-02 19:12:21,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6221 states, 6217 states have (on average 1.02814862473862) internal successors, (6392), 6217 states have internal predecessors, (6392), 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 19:12:21,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6221 states to 6221 states and 6395 transitions. [2021-05-02 19:12:21,570 INFO L78 Accepts]: Start accepts. Automaton has 6221 states and 6395 transitions. Word has length 2983 [2021-05-02 19:12:21,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:12:21,571 INFO L480 AbstractCegarLoop]: Abstraction has 6221 states and 6395 transitions. [2021-05-02 19:12:21,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 19:12:21,571 INFO L276 IsEmpty]: Start isEmpty. Operand 6221 states and 6395 transitions. [2021-05-02 19:12:21,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4916 [2021-05-02 19:12:21,723 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:12:21,724 INFO L523 BasicCegarLoop]: trace histogram [1501, 1500, 1500, 94, 93, 93, 31, 30, 30, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:12:21,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 19:12:21,929 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:12:21,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:12:21,930 INFO L82 PathProgramCache]: Analyzing trace with hash -306539779, now seen corresponding path program 8 times [2021-05-02 19:12:21,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:12:21,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978625402] [2021-05-02 19:12:21,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:12:47,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:12:52,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:12:52,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:12:52,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3532846 backedges. 175 proven. 76173 refuted. 0 times theorem prover too weak. 3456498 trivial. 0 not checked. [2021-05-02 19:12:52,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:12:52,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978625402] [2021-05-02 19:12:52,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978625402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:12:52,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852612702] [2021-05-02 19:12:52,317 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:12:53,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:12:53,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:12:53,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 6905 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 19:12:54,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:13:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 3532846 backedges. 29811 proven. 2315896 refuted. 0 times theorem prover too weak. 1187139 trivial. 0 not checked. [2021-05-02 19:13:00,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852612702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:13:00,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:13:00,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 32 [2021-05-02 19:13:00,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486021386] [2021-05-02 19:13:00,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 19:13:00,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:13:00,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 19:13:00,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2021-05-02 19:13:00,887 INFO L87 Difference]: Start difference. First operand 6221 states and 6395 transitions. Second operand has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 19:13:10,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:13:10,513 INFO L93 Difference]: Finished difference Result 10308 states and 10576 transitions. [2021-05-02 19:13:10,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-02 19:13:10,514 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 4915 [2021-05-02 19:13:10,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:13:10,538 INFO L225 Difference]: With dead ends: 10308 [2021-05-02 19:13:10,538 INFO L226 Difference]: Without dead ends: 9714 [2021-05-02 19:13:10,541 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5019 GetRequests, 4909 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 7629.5ms TimeCoverageRelationStatistics Valid=1066, Invalid=11366, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 19:13:10,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9714 states. [2021-05-02 19:13:10,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9714 to 6707. [2021-05-02 19:13:10,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6707 states, 6703 states have (on average 1.0267044606892437) internal successors, (6882), 6703 states have internal predecessors, (6882), 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 19:13:10,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6707 states to 6707 states and 6885 transitions. [2021-05-02 19:13:10,693 INFO L78 Accepts]: Start accepts. Automaton has 6707 states and 6885 transitions. Word has length 4915 [2021-05-02 19:13:10,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:13:10,694 INFO L480 AbstractCegarLoop]: Abstraction has 6707 states and 6885 transitions. [2021-05-02 19:13:10,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 19:13:10,694 INFO L276 IsEmpty]: Start isEmpty. Operand 6707 states and 6885 transitions. [2021-05-02 19:13:10,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6707 [2021-05-02 19:13:10,956 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:13:10,957 INFO L523 BasicCegarLoop]: trace histogram [2058, 2057, 2057, 121, 120, 120, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:13:11,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 19:13:11,158 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:13:11,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:13:11,160 INFO L82 PathProgramCache]: Analyzing trace with hash 646367848, now seen corresponding path program 9 times [2021-05-02 19:13:11,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:13:11,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611693986] [2021-05-02 19:13:11,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:13:59,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:06,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:14:06,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:07,107 INFO L134 CoverageAnalysis]: Checked inductivity of 6624124 backedges. 228 proven. 110722 refuted. 0 times theorem prover too weak. 6513174 trivial. 0 not checked. [2021-05-02 19:14:07,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:07,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611693986] [2021-05-02 19:14:07,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611693986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:07,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321031569] [2021-05-02 19:14:07,108 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:22,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 19:14:22,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:14:22,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 19:14:22,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:33,075 INFO L134 CoverageAnalysis]: Checked inductivity of 6624124 backedges. 1283172 proven. 442 refuted. 0 times theorem prover too weak. 5340510 trivial. 0 not checked. [2021-05-02 19:14:33,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321031569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:33,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:14:33,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-05-02 19:14:33,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891809007] [2021-05-02 19:14:33,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 19:14:33,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:33,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 19:14:33,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1662, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 19:14:33,081 INFO L87 Difference]: Start difference. First operand 6707 states and 6885 transitions. Second operand has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 19:14:34,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:34,820 INFO L93 Difference]: Finished difference Result 7674 states and 7852 transitions. [2021-05-02 19:14:34,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 19:14:34,821 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 6706 [2021-05-02 19:14:34,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:34,832 INFO L225 Difference]: With dead ends: 7674 [2021-05-02 19:14:34,832 INFO L226 Difference]: Without dead ends: 7674 [2021-05-02 19:14:34,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6752 GetRequests, 6689 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 758 ImplicationChecksByTransitivity, 2189.8ms TimeCoverageRelationStatistics Valid=484, Invalid=3676, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 19:14:34,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7674 states. [2021-05-02 19:14:34,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7674 to 7433. [2021-05-02 19:14:34,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7433 states, 7429 states have (on average 1.024094763763629) internal successors, (7608), 7429 states have internal predecessors, (7608), 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 19:14:34,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7433 states to 7433 states and 7611 transitions. [2021-05-02 19:14:34,939 INFO L78 Accepts]: Start accepts. Automaton has 7433 states and 7611 transitions. Word has length 6706 [2021-05-02 19:14:34,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:34,940 INFO L480 AbstractCegarLoop]: Abstraction has 7433 states and 7611 transitions. [2021-05-02 19:14:34,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 19:14:34,940 INFO L276 IsEmpty]: Start isEmpty. Operand 7433 states and 7611 transitions. [2021-05-02 19:14:35,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7433 [2021-05-02 19:14:35,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:35,323 INFO L523 BasicCegarLoop]: trace histogram [2300, 2299, 2299, 121, 120, 120, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:35,534 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:35,534 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:35,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:35,536 INFO L82 PathProgramCache]: Analyzing trace with hash -218512280, now seen corresponding path program 10 times [2021-05-02 19:14:35,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:35,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779437521] [2021-05-02 19:14:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:38,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:46,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:15:46,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:46,508 INFO L134 CoverageAnalysis]: Checked inductivity of 8234513 backedges. 228 proven. 137471 refuted. 0 times theorem prover too weak. 8096814 trivial. 0 not checked. [2021-05-02 19:15:46,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:46,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779437521] [2021-05-02 19:15:46,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779437521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:46,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472695333] [2021-05-02 19:15:46,509 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:53,469 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:15:53,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:53,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 10341 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 19:15:53,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:55,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:16:02,292 INFO L134 CoverageAnalysis]: Checked inductivity of 8234513 backedges. 2397869 proven. 41459 refuted. 0 times theorem prover too weak. 5795185 trivial. 0 not checked. [2021-05-02 19:16:02,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472695333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:16:02,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:16:02,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 13] total 37 [2021-05-02 19:16:02,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833354942] [2021-05-02 19:16:02,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 19:16:02,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:16:02,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 19:16:02,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1215, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 19:16:02,297 INFO L87 Difference]: Start difference. First operand 7433 states and 7611 transitions. Second operand has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 19:16:17,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:16:17,310 INFO L93 Difference]: Finished difference Result 13818 states and 14124 transitions. [2021-05-02 19:16:17,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-02 19:16:17,311 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 7432 [2021-05-02 19:16:17,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:16:17,329 INFO L225 Difference]: With dead ends: 13818 [2021-05-02 19:16:17,329 INFO L226 Difference]: Without dead ends: 13134 [2021-05-02 19:16:17,332 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7574 GetRequests, 7428 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6840 ImplicationChecksByTransitivity, 11539.7ms TimeCoverageRelationStatistics Valid=1427, Invalid=20329, Unknown=0, NotChecked=0, Total=21756 [2021-05-02 19:16:17,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13134 states. [2021-05-02 19:16:17,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13134 to 10316. [2021-05-02 19:16:17,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10316 states, 10312 states have (on average 1.0212373933281613) internal successors, (10531), 10312 states have internal predecessors, (10531), 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 19:16:17,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10316 states to 10316 states and 10534 transitions. [2021-05-02 19:16:17,469 INFO L78 Accepts]: Start accepts. Automaton has 10316 states and 10534 transitions. Word has length 7432 [2021-05-02 19:16:17,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:16:17,470 INFO L480 AbstractCegarLoop]: Abstraction has 10316 states and 10534 transitions. [2021-05-02 19:16:17,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 19:16:17,470 INFO L276 IsEmpty]: Start isEmpty. Operand 10316 states and 10534 transitions. [2021-05-02 19:16:18,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10316 [2021-05-02 19:16:18,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:16:18,109 INFO L523 BasicCegarLoop]: trace histogram [3221, 3220, 3220, 161, 160, 160, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:16:18,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 19:16:18,314 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:16:18,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:16:18,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1971804252, now seen corresponding path program 11 times [2021-05-02 19:16:18,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:16:18,316 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172031798] [2021-05-02 19:16:18,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:18:25,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:18:41,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:18:41,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:18:41,784 INFO L134 CoverageAnalysis]: Checked inductivity of 16117172 backedges. 268 proven. 202370 refuted. 0 times theorem prover too weak. 15914534 trivial. 0 not checked. [2021-05-02 19:18:41,785 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:18:41,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172031798] [2021-05-02 19:18:41,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172031798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:18:41,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518453959] [2021-05-02 19:18:41,785 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true