/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:23:43,448 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:23:43,450 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:23:43,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:23:43,480 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:23:43,481 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:23:43,482 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:23:43,483 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:23:43,484 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:23:43,485 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:23:43,485 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:23:43,486 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:23:43,486 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:23:43,487 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:23:43,488 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:23:43,488 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:23:43,489 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:23:43,490 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:23:43,491 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:23:43,492 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:23:43,493 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:23:43,493 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:23:43,494 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:23:43,495 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:23:43,496 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:23:43,501 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:23:43,509 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:23:43,509 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:23:43,512 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:23:43,520 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:23:43,520 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:23:43,521 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:23:43,521 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:23:43,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:23:43,521 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:23:43,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:23:43,522 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:23:43,522 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:23:43,523 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:23:43,523 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:23:43,523 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:23:43,523 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:43,523 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:23:43,523 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:23:43,524 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:23:43,524 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:23:43,780 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:23:43,797 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:23:43,799 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:23:43,800 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:23:43,800 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:23:43,800 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2021-05-02 18:23:43,865 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc490cb8e/2494b757006a472b92aa1f36599e9181/FLAG33c112020 [2021-05-02 18:23:44,202 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:23:44,203 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2021-05-02 18:23:44,206 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc490cb8e/2494b757006a472b92aa1f36599e9181/FLAG33c112020 [2021-05-02 18:23:44,634 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc490cb8e/2494b757006a472b92aa1f36599e9181 [2021-05-02 18:23:44,636 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:23:44,638 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:23:44,640 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:44,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:23:44,642 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:23:44,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,644 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ee46738 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44, skipping insertion in model container [2021-05-02 18:23:44,644 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,649 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:23:44,658 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:23:44,748 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2021-05-02 18:23:44,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:44,760 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:23:44,797 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2021-05-02 18:23:44,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:44,807 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:23:44,807 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44 WrapperNode [2021-05-02 18:23:44,807 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:44,808 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:23:44,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:23:44,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:23:44,814 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,815 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,818 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,818 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,828 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,832 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... [2021-05-02 18:23:44,834 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:23:44,835 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:23:44,835 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:23:44,836 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:23:44,836 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:44,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:23:44,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:23:44,907 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:23:44,907 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:23:44,907 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:23:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:23:44,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:23:44,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:23:44,909 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:23:44,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:23:45,100 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:23:45,100 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:23:45,101 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:45 BoogieIcfgContainer [2021-05-02 18:23:45,101 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:23:45,102 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:23:45,102 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:23:45,102 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:23:45,104 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:45" (1/1) ... [2021-05-02 18:23:45,114 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:45 BasicIcfg [2021-05-02 18:23:45,115 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:23:45,116 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:23:45,116 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:23:45,125 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:23:45,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:23:44" (1/4) ... [2021-05-02 18:23:45,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17d0b08f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:45, skipping insertion in model container [2021-05-02 18:23:45,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:44" (2/4) ... [2021-05-02 18:23:45,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17d0b08f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:45, skipping insertion in model container [2021-05-02 18:23:45,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:45" (3/4) ... [2021-05-02 18:23:45,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17d0b08f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:23:45, skipping insertion in model container [2021-05-02 18:23:45,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:45" (4/4) ... [2021-05-02 18:23:45,127 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-2.cJordan [2021-05-02 18:23:45,130 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:23:45,133 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:23:45,160 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:23:45,172 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:23:45,173 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:23:45,173 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:23:45,173 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:23:45,173 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:23:45,173 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:23:45,173 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:23:45,173 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:23:45,182 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:45,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:45,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,187 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,188 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,191 INFO L82 PathProgramCache]: Analyzing trace with hash -756157467, now seen corresponding path program 1 times [2021-05-02 18:23:45,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466358561] [2021-05-02 18:23:45,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,423 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 18:23:45,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466358561] [2021-05-02 18:23:45,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466358561] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:45,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:45,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:23:45,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553888513] [2021-05-02 18:23:45,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:45,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:45,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:45,446 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:45,499 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:23:45,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:45,502 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:23:45,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:45,509 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:23:45,509 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 18:23:45,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 57.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:45,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 18:23:45,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 18:23:45,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 18:23:45,535 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 18:23:45,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:45,536 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 18:23:45,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,536 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 18:23:45,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:45,537 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,537 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:23:45,537 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,538 INFO L82 PathProgramCache]: Analyzing trace with hash -755233946, now seen corresponding path program 1 times [2021-05-02 18:23:45,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354465285] [2021-05-02 18:23:45,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,657 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 18:23:45,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354465285] [2021-05-02 18:23:45,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354465285] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:45,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:45,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:23:45,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964515419] [2021-05-02 18:23:45,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:45,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:45,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:45,662 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:45,737 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-05-02 18:23:45,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:45,738 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:23:45,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:45,738 INFO L225 Difference]: With dead ends: 15 [2021-05-02 18:23:45,738 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 18:23:45,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:23:45,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 18:23:45,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 18:23:45,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 18:23:45,741 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 18:23:45,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:45,741 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 18:23:45,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:45,741 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 18:23:45,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:23:45,742 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,742 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:23:45,742 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,743 INFO L82 PathProgramCache]: Analyzing trace with hash 980092676, now seen corresponding path program 1 times [2021-05-02 18:23:45,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743671126] [2021-05-02 18:23:45,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,863 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743671126] [2021-05-02 18:23:45,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743671126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963681888] [2021-05-02 18:23:45,864 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 18:23:45,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:23:45,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963681888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:45,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:23:45,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932499719] [2021-05-02 18:23:45,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:23:45,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:23:45,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:45,993 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:46,085 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:23:46,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:23:46,086 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 18:23:46,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:46,087 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:23:46,087 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:23:46,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 87.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:46,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:23:46,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:23:46,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 18:23:46,093 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 18:23:46,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:46,093 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 18:23:46,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,093 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 18:23:46,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:23:46,093 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:46,094 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:46,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:23:46,303 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:46,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:46,303 INFO L82 PathProgramCache]: Analyzing trace with hash -2113301726, now seen corresponding path program 2 times [2021-05-02 18:23:46,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:46,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452745665] [2021-05-02 18:23:46,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:46,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:46,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,372 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:46,372 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:46,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452745665] [2021-05-02 18:23:46,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452745665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613354062] [2021-05-02 18:23:46,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:46,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:46,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:46,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:23:46,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:46,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:46,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613354062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:46,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:23:46,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468330986] [2021-05-02 18:23:46,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:23:46,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:46,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:23:46,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:23:46,460 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:46,576 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:23:46,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:23:46,576 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 18:23:46,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:46,577 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:23:46,577 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 18:23:46,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 117.9ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:46,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 18:23:46,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 18:23:46,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:23:46,579 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 18:23:46,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:46,579 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:23:46,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,580 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:23:46,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:23:46,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:46,580 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:46,799 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:46,799 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:46,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:46,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1547014080, now seen corresponding path program 3 times [2021-05-02 18:23:46,800 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:46,800 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929656368] [2021-05-02 18:23:46,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:46,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:46,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,888 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:46,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:46,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929656368] [2021-05-02 18:23:46,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929656368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137892688] [2021-05-02 18:23:46,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:46,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:23:46,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:46,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:46,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:46,977 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 18:23:46,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137892688] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:46,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:46,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 18:23:46,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557494824] [2021-05-02 18:23:46,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:46,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:46,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:46,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:46,979 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 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 18:23:46,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:46,987 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 18:23:46,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:46,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 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 17 [2021-05-02 18:23:46,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:46,988 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:23:46,988 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:23:46,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 54.9ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:46,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:23:46,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 18:23:46,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 18:23:46,990 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 18:23:46,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:46,991 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 18:23:46,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 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 18:23:46,991 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 18:23:46,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:23:46,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:46,991 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:47,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:47,197 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:47,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:47,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1560917373, now seen corresponding path program 1 times [2021-05-02 18:23:47,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:47,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749765869] [2021-05-02 18:23:47,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:47,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:47,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,315 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:47,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:47,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749765869] [2021-05-02 18:23:47,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749765869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638009300] [2021-05-02 18:23:47,317 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 18:23:47,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:47,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:47,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,428 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:47,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638009300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:47,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:23:47,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074127433] [2021-05-02 18:23:47,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:23:47,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:47,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:23:47,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:47,429 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:47,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:47,575 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:23:47,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:23:47,576 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 18:23:47,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:47,577 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:23:47,577 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:23:47,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 146.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:47,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:23:47,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 18:23:47,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:47,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:23:47,580 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 18:23:47,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:47,580 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:23:47,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:47,580 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:23:47,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:23:47,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:47,581 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:47,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:47,797 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:47,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:47,798 INFO L82 PathProgramCache]: Analyzing trace with hash 294269723, now seen corresponding path program 2 times [2021-05-02 18:23:47,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:47,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630613539] [2021-05-02 18:23:47,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:47,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,914 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:47,915 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:47,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630613539] [2021-05-02 18:23:47,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630613539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47282869] [2021-05-02 18:23:47,915 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 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 18:23:47,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:47,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:47,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:23:47,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:48,013 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:48,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47282869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:48,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:48,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 18:23:48,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612168604] [2021-05-02 18:23:48,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:23:48,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:48,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:23:48,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:48,014 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:48,194 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 18:23:48,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:23:48,195 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 18:23:48,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:48,196 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:23:48,196 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:23:48,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 169.7ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:23:48,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:23:48,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 18:23:48,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:23:48,198 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 18:23:48,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:48,198 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:23:48,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,198 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:23:48,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:23:48,199 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:48,199 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:48,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:23:48,405 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:48,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:48,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1478377159, now seen corresponding path program 3 times [2021-05-02 18:23:48,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:48,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605281707] [2021-05-02 18:23:48,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:48,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:48,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:48,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:48,530 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:48,530 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:48,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605281707] [2021-05-02 18:23:48,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605281707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:48,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753944438] [2021-05-02 18:23:48,530 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 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 18:23:48,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:23:48,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:48,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:23:48,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:48,638 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 18:23:48,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753944438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:48,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:48,639 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 18:23:48,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170797800] [2021-05-02 18:23:48,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:48,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:48,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:48,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:48,640 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:48,985 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 18:23:48,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:23:48,985 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 18:23:48,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:48,986 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:23:48,986 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:23:48,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 327.2ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:48,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:23:48,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 18:23:48,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 18:23:48,988 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 18:23:48,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:48,989 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 18:23:48,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:48,989 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 18:23:48,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:23:48,989 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:48,989 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:49,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:49,193 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:49,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:49,194 INFO L82 PathProgramCache]: Analyzing trace with hash -738804780, now seen corresponding path program 4 times [2021-05-02 18:23:49,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:49,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985850755] [2021-05-02 18:23:49,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:49,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:49,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,299 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:49,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:49,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985850755] [2021-05-02 18:23:49,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985850755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:49,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797878033] [2021-05-02 18:23:49,299 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 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 18:23:49,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:49,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:49,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:23:49,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:49,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:49,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:49,435 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:49,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797878033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:49,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:49,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:23:49,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919957352] [2021-05-02 18:23:49,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:49,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:49,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:49,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:49,440 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:49,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:49,701 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-02 18:23:49,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:23:49,701 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 18:23:49,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:49,701 INFO L225 Difference]: With dead ends: 30 [2021-05-02 18:23:49,701 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 18:23:49,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 252.2ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:49,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 18:23:49,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 18:23:49,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:49,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 18:23:49,704 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 18:23:49,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:49,704 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 18:23:49,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:49,704 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 18:23:49,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:23:49,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:49,704 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:49,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:49,920 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:49,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:49,920 INFO L82 PathProgramCache]: Analyzing trace with hash -186205326, now seen corresponding path program 5 times [2021-05-02 18:23:49,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:49,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778780026] [2021-05-02 18:23:49,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:49,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,066 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:50,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778780026] [2021-05-02 18:23:50,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778780026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673585109] [2021-05-02 18:23:50,066 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 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 18:23:50,179 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 18:23:50,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:50,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:23:50,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:50,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,311 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:50,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673585109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:50,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:23:50,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164933010] [2021-05-02 18:23:50,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:23:50,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:50,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:23:50,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:50,313 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:50,655 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 18:23:50,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:23:50,656 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:23:50,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:50,656 INFO L225 Difference]: With dead ends: 32 [2021-05-02 18:23:50,656 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:23:50,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 357.8ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:50,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:23:50,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 18:23:50,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 18:23:50,658 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 18:23:50,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:50,659 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 18:23:50,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,659 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 18:23:50,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:23:50,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,659 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:23:50,860 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1714074736, now seen corresponding path program 6 times [2021-05-02 18:23:50,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844346876] [2021-05-02 18:23:50,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:51,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,008 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:51,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:51,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844346876] [2021-05-02 18:23:51,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844346876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489383941] [2021-05-02 18:23:51,008 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 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 18:23:51,157 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 18:23:51,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:51,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:51,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:51,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:51,273 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:51,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489383941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:51,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 18:23:51,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471343266] [2021-05-02 18:23:51,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:51,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:51,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:51,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:51,275 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:51,654 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 18:23:51,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:23:51,655 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 18:23:51,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:51,655 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:23:51,655 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:23:51,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 365.0ms TimeCoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:23:51,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:23:51,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 18:23:51,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 18:23:51,658 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 18:23:51,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:51,658 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 18:23:51,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,658 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 18:23:51,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:23:51,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:51,659 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:51,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:51,860 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:51,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:51,860 INFO L82 PathProgramCache]: Analyzing trace with hash -1117762514, now seen corresponding path program 7 times [2021-05-02 18:23:51,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:51,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908653021] [2021-05-02 18:23:51,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:51,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:52,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,016 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:52,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:52,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908653021] [2021-05-02 18:23:52,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908653021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308627347] [2021-05-02 18:23:52,017 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 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 18:23:52,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:52,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:52,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:52,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:52,226 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:52,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308627347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:52,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:23:52,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423828114] [2021-05-02 18:23:52,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:52,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:52,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:52,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:52,229 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:52,708 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 18:23:52,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:23:52,708 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 18:23:52,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:52,709 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:23:52,709 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 18:23:52,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 423.9ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:23:52,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 18:23:52,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 18:23:52,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 18:23:52,712 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 18:23:52,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:52,713 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 18:23:52,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,713 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 18:23:52,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:23:52,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:52,714 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:52,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:52,917 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:52,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:52,918 INFO L82 PathProgramCache]: Analyzing trace with hash 707632460, now seen corresponding path program 8 times [2021-05-02 18:23:52,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:52,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576582379] [2021-05-02 18:23:52,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:52,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,073 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:53,073 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:53,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576582379] [2021-05-02 18:23:53,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576582379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915807324] [2021-05-02 18:23:53,074 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 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 18:23:53,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:53,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:53,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:23:53,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:53,265 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:53,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915807324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:53,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 18:23:53,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753034868] [2021-05-02 18:23:53,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:23:53,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:53,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:23:53,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:23:53,268 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:53,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:53,734 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 18:23:53,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:23:53,735 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 18:23:53,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:53,735 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:23:53,735 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:23:53,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 434.6ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:23:53,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:23:53,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 18:23:53,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:53,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 18:23:53,738 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 18:23:53,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:53,738 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 18:23:53,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:53,739 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 18:23:53,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:23:53,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:53,739 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:53,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:23:53,945 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:53,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:53,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1729421590, now seen corresponding path program 9 times [2021-05-02 18:23:53,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:53,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621665921] [2021-05-02 18:23:53,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:53,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:54,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,117 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:54,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:54,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621665921] [2021-05-02 18:23:54,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621665921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601453312] [2021-05-02 18:23:54,118 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 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 18:23:54,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 18:23:54,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:54,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:23:54,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:54,319 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 18:23:54,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601453312] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:54,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 18:23:54,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923909445] [2021-05-02 18:23:54,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:23:54,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:54,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:23:54,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:54,320 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:55,103 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-05-02 18:23:55,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:23:55,104 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 18:23:55,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:55,105 INFO L225 Difference]: With dead ends: 45 [2021-05-02 18:23:55,105 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 18:23:55,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 734.8ms TimeCoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:23:55,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 18:23:55,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-05-02 18:23:55,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-02 18:23:55,109 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2021-05-02 18:23:55,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:55,109 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-02 18:23:55,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,109 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-02 18:23:55,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:23:55,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:55,110 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:55,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:23:55,326 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:55,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:55,327 INFO L82 PathProgramCache]: Analyzing trace with hash 761242821, now seen corresponding path program 10 times [2021-05-02 18:23:55,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:55,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37728318] [2021-05-02 18:23:55,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:55,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:55,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,521 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:55,521 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:55,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37728318] [2021-05-02 18:23:55,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37728318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294141382] [2021-05-02 18:23:55,521 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 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 18:23:55,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:55,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:55,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:23:55,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:55,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,743 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:55,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294141382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:55,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:23:55,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313825223] [2021-05-02 18:23:55,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:23:55,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:55,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:23:55,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:23:55,745 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:56,367 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 18:23:56,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:23:56,368 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 18:23:56,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:56,368 INFO L225 Difference]: With dead ends: 44 [2021-05-02 18:23:56,369 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 18:23:56,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 527.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:23:56,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 18:23:56,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 18:23:56,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-02 18:23:56,371 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 41 [2021-05-02 18:23:56,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:56,371 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-02 18:23:56,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,372 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-02 18:23:56,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:23:56,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:56,372 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:56,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:23:56,585 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:56,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:56,585 INFO L82 PathProgramCache]: Analyzing trace with hash -2075068445, now seen corresponding path program 11 times [2021-05-02 18:23:56,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:56,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285906313] [2021-05-02 18:23:56,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:56,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,827 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:56,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:56,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285906313] [2021-05-02 18:23:56,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285906313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:56,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390527867] [2021-05-02 18:23:56,828 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 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 18:23:57,500 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:23:57,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:57,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 18:23:57,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:57,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:57,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:57,774 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:57,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390527867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:57,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:57,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:23:57,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252801563] [2021-05-02 18:23:57,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:23:57,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:57,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:23:57,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:57,776 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:58,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:58,453 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2021-05-02 18:23:58,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:23:58,454 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 18:23:58,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:58,454 INFO L225 Difference]: With dead ends: 46 [2021-05-02 18:23:58,454 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 18:23:58,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 741.2ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:23:58,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 18:23:58,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 18:23:58,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:58,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-02 18:23:58,457 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2021-05-02 18:23:58,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:58,457 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-02 18:23:58,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:58,457 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-02 18:23:58,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 18:23:58,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:58,458 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:58,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:58,662 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:58,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:58,662 INFO L82 PathProgramCache]: Analyzing trace with hash -465962111, now seen corresponding path program 12 times [2021-05-02 18:23:58,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:58,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326541193] [2021-05-02 18:23:58,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:58,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:58,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,838 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:58,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:58,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326541193] [2021-05-02 18:23:58,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326541193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:58,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842150021] [2021-05-02 18:23:58,838 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 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 18:23:58,954 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:23:58,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:58,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:23:58,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:59,078 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-02 18:23:59,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842150021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:59,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:59,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 18:23:59,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135060224] [2021-05-02 18:23:59,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:23:59,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:59,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:23:59,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:23:59,079 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:00,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:00,017 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2021-05-02 18:24:00,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:24:00,018 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 18:24:00,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:00,018 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:24:00,018 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:24:00,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 895.3ms TimeCoverageRelationStatistics Valid=299, Invalid=1423, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:00,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:24:00,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-05-02 18:24:00,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:00,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-02 18:24:00,021 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 45 [2021-05-02 18:24:00,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:00,021 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-02 18:24:00,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:00,021 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-02 18:24:00,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:24:00,022 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:00,022 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:00,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:24:00,226 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:00,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:00,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1812216220, now seen corresponding path program 13 times [2021-05-02 18:24:00,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:00,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369426008] [2021-05-02 18:24:00,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:00,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:00,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,449 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:00,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:00,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369426008] [2021-05-02 18:24:00,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369426008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420192682] [2021-05-02 18:24:00,450 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:00,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:24:00,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:00,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:00,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:00,584 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:00,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420192682] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:00,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:24:00,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168750593] [2021-05-02 18:24:00,585 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:24:00,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:00,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:24:00,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:24:00,585 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:01,285 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 18:24:01,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:24:01,286 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 18:24:01,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:01,286 INFO L225 Difference]: With dead ends: 52 [2021-05-02 18:24:01,286 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 18:24:01,287 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 626.5ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:24:01,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 18:24:01,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 18:24:01,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 18:24:01,289 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 49 [2021-05-02 18:24:01,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:01,289 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 18:24:01,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,289 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 18:24:01,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 18:24:01,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:01,290 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:01,497 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:24:01,497 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:01,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:01,498 INFO L82 PathProgramCache]: Analyzing trace with hash -772305222, now seen corresponding path program 14 times [2021-05-02 18:24:01,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:01,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486547310] [2021-05-02 18:24:01,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:01,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:01,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,731 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:01,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:01,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486547310] [2021-05-02 18:24:01,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486547310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:01,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220504619] [2021-05-02 18:24:01,731 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:01,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:01,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:01,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:24:01,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:01,951 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:01,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220504619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:01,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:01,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 18:24:01,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818246637] [2021-05-02 18:24:01,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:24:01,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:01,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:24:01,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:24:01,952 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:02,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:02,750 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2021-05-02 18:24:02,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:24:02,751 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 18:24:02,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:02,751 INFO L225 Difference]: With dead ends: 54 [2021-05-02 18:24:02,751 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 18:24:02,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 734.7ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:02,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 18:24:02,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 18:24:02,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:02,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-02 18:24:02,758 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 51 [2021-05-02 18:24:02,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:02,758 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-02 18:24:02,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:02,758 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-02 18:24:02,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:24:02,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:02,759 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:02,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:02,973 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:02,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:02,973 INFO L82 PathProgramCache]: Analyzing trace with hash -2006313896, now seen corresponding path program 15 times [2021-05-02 18:24:02,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:02,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300562518] [2021-05-02 18:24:02,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:02,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:03,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:03,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:03,225 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:03,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:03,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300562518] [2021-05-02 18:24:03,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300562518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:03,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369195706] [2021-05-02 18:24:03,226 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:03,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:24:03,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:03,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:24:03,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 18:24:03,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369195706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:03,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:03,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 18:24:03,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246379764] [2021-05-02 18:24:03,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:24:03,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:03,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:24:03,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=524, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:24:03,478 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:04,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:04,833 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2021-05-02 18:24:04,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:24:04,833 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 18:24:04,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:04,834 INFO L225 Difference]: With dead ends: 61 [2021-05-02 18:24:04,834 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 18:24:04,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 1269.5ms TimeCoverageRelationStatistics Valid=395, Invalid=2055, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:24:04,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 18:24:04,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2021-05-02 18:24:04,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:04,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 18:24:04,839 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 53 [2021-05-02 18:24:04,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:04,839 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 18:24:04,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:04,839 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 18:24:04,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:24:04,840 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:04,840 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:05,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:05,052 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:05,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:05,053 INFO L82 PathProgramCache]: Analyzing trace with hash -695600461, now seen corresponding path program 16 times [2021-05-02 18:24:05,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:05,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38562113] [2021-05-02 18:24:05,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:05,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:05,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:05,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:05,322 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:05,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:05,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38562113] [2021-05-02 18:24:05,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38562113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:05,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857749222] [2021-05-02 18:24:05,322 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:05,381 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:05,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:05,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:24:05,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:05,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:05,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:05,523 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:05,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857749222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:05,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:05,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:24:05,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200025056] [2021-05-02 18:24:05,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:24:05,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:05,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:24:05,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:24:05,527 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:06,381 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-02 18:24:06,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:24:06,381 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 18:24:06,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:06,382 INFO L225 Difference]: With dead ends: 60 [2021-05-02 18:24:06,382 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 18:24:06,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 749.4ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:06,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 18:24:06,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 18:24:06,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 55 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2021-05-02 18:24:06,384 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 57 [2021-05-02 18:24:06,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:06,385 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2021-05-02 18:24:06,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,385 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2021-05-02 18:24:06,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:24:06,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:06,385 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:06,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:06,586 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:06,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:06,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1302507055, now seen corresponding path program 17 times [2021-05-02 18:24:06,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:06,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792523374] [2021-05-02 18:24:06,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:06,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:06,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:06,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792523374] [2021-05-02 18:24:06,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792523374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:06,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085809571] [2021-05-02 18:24:06,877 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:08,151 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:24:08,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:08,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 18:24:08,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:08,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:08,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:08,370 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 69 proven. 506 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:24:08,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085809571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:08,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:08,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25] total 27 [2021-05-02 18:24:08,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237497018] [2021-05-02 18:24:08,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:24:08,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:08,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:24:08,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:24:08,372 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:09,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:09,365 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:24:09,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:24:09,366 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 18:24:09,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:09,366 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:24:09,366 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:24:09,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 918.2ms TimeCoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:24:09,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:24:09,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 18:24:09,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.105263157894737) internal successors, (63), 57 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:09,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2021-05-02 18:24:09,369 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 59 [2021-05-02 18:24:09,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:09,369 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2021-05-02 18:24:09,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:09,372 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2021-05-02 18:24:09,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 18:24:09,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:09,372 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:09,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:24:09,576 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:09,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:09,577 INFO L82 PathProgramCache]: Analyzing trace with hash -424191633, now seen corresponding path program 18 times [2021-05-02 18:24:09,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:09,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967171038] [2021-05-02 18:24:09,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:09,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:09,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,897 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:09,897 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:09,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967171038] [2021-05-02 18:24:09,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967171038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:09,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399228303] [2021-05-02 18:24:09,897 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:10,603 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 18:24:10,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:10,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:24:10,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:10,813 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 220 proven. 25 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-05-02 18:24:10,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399228303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:10,813 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:10,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8] total 30 [2021-05-02 18:24:10,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803648025] [2021-05-02 18:24:10,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:24:10,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:10,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:24:10,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=709, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:24:10,815 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:12,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:12,581 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-05-02 18:24:12,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:24:12,582 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 18:24:12,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:12,582 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:24:12,582 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:24:12,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1743.2ms TimeCoverageRelationStatistics Valid=503, Invalid=2803, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:24:12,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:24:12,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-05-02 18:24:12,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 61 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:12,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 72 transitions. [2021-05-02 18:24:12,585 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 72 transitions. Word has length 61 [2021-05-02 18:24:12,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:12,585 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 72 transitions. [2021-05-02 18:24:12,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:12,585 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 72 transitions. [2021-05-02 18:24:12,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:24:12,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:12,586 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:12,786 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:24:12,786 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:12,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:12,787 INFO L82 PathProgramCache]: Analyzing trace with hash 821090314, now seen corresponding path program 19 times [2021-05-02 18:24:12,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:12,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263989573] [2021-05-02 18:24:12,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:12,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:13,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,116 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:13,116 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:13,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263989573] [2021-05-02 18:24:13,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263989573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:13,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060088813] [2021-05-02 18:24:13,117 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:13,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:24:13,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:13,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:13,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:13,294 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:13,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060088813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:13,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:13,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:24:13,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77165267] [2021-05-02 18:24:13,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:24:13,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:13,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:24:13,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:24:13,296 INFO L87 Difference]: Start difference. First operand 66 states and 72 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:14,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:14,327 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2021-05-02 18:24:14,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:24:14,327 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 18:24:14,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:14,328 INFO L225 Difference]: With dead ends: 68 [2021-05-02 18:24:14,328 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 18:24:14,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 915.2ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:24:14,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 18:24:14,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-02 18:24:14,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 63 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:14,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-05-02 18:24:14,330 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 65 [2021-05-02 18:24:14,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:14,330 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-05-02 18:24:14,330 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:14,330 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-05-02 18:24:14,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 18:24:14,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:14,331 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:14,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:14,545 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:14,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:14,545 INFO L82 PathProgramCache]: Analyzing trace with hash 729952552, now seen corresponding path program 20 times [2021-05-02 18:24:14,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:14,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480075101] [2021-05-02 18:24:14,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:14,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:14,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:14,936 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:14,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:14,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480075101] [2021-05-02 18:24:14,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480075101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:14,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494935167] [2021-05-02 18:24:14,936 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:14,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:14,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:14,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:24:14,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:15,276 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:15,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494935167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:15,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:15,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 18:24:15,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296598641] [2021-05-02 18:24:15,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:24:15,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:15,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:24:15,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:24:15,277 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:16,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:16,604 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2021-05-02 18:24:16,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:24:16,604 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 18:24:16,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:16,605 INFO L225 Difference]: With dead ends: 70 [2021-05-02 18:24:16,605 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 18:24:16,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1236.6ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:24:16,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 18:24:16,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-02 18:24:16,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:16,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-05-02 18:24:16,607 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 67 [2021-05-02 18:24:16,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:16,607 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-05-02 18:24:16,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:16,607 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-05-02 18:24:16,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 18:24:16,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:16,608 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:16,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:24:16,808 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:16,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:16,809 INFO L82 PathProgramCache]: Analyzing trace with hash -954090810, now seen corresponding path program 21 times [2021-05-02 18:24:16,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:16,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200278956] [2021-05-02 18:24:16,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:16,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:17,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:17,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:17,214 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:17,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:17,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200278956] [2021-05-02 18:24:17,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200278956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:17,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693841108] [2021-05-02 18:24:17,214 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:17,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:24:17,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:17,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:24:17,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:17,565 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 18:24:17,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693841108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:17,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:17,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 18:24:17,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179457079] [2021-05-02 18:24:17,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:24:17,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:17,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:24:17,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=922, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:24:17,566 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:20,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:20,119 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2021-05-02 18:24:20,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:24:20,119 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 18:24:20,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:20,120 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:24:20,120 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:24:20,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 2423.6ms TimeCoverageRelationStatistics Valid=623, Invalid=3667, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:24:20,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:24:20,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-05-02 18:24:20,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:20,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2021-05-02 18:24:20,122 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 69 [2021-05-02 18:24:20,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:20,122 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2021-05-02 18:24:20,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:20,122 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2021-05-02 18:24:20,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 18:24:20,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:20,123 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:20,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:20,323 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:20,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:20,324 INFO L82 PathProgramCache]: Analyzing trace with hash 83673505, now seen corresponding path program 22 times [2021-05-02 18:24:20,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:20,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404528504] [2021-05-02 18:24:20,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:20,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:20,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:20,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:20,753 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:20,754 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:20,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404528504] [2021-05-02 18:24:20,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404528504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:20,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811201346] [2021-05-02 18:24:20,754 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:20,793 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:20,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:20,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 18:24:20,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:20,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:20,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:20,974 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:20,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811201346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:20,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:20,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:24:20,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641354150] [2021-05-02 18:24:20,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:24:20,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:20,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:24:20,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:24:20,976 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:22,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:22,302 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2021-05-02 18:24:22,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:24:22,302 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 18:24:22,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:22,303 INFO L225 Difference]: With dead ends: 76 [2021-05-02 18:24:22,303 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 18:24:22,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1165.0ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:24:22,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 18:24:22,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-02 18:24:22,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.1126760563380282) internal successors, (79), 71 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:22,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 83 transitions. [2021-05-02 18:24:22,305 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 83 transitions. Word has length 73 [2021-05-02 18:24:22,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:22,305 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 83 transitions. [2021-05-02 18:24:22,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:22,305 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 83 transitions. [2021-05-02 18:24:22,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 18:24:22,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:22,306 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:22,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:24:22,522 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:22,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:22,522 INFO L82 PathProgramCache]: Analyzing trace with hash 153754815, now seen corresponding path program 23 times [2021-05-02 18:24:22,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:22,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243996058] [2021-05-02 18:24:22,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:22,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:22,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:22,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:22,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:22,964 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:22,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243996058] [2021-05-02 18:24:22,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243996058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:22,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348262454] [2021-05-02 18:24:22,964 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:27,060 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 18:24:27,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:27,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:24:27,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:27,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:27,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348262454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:27,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:27,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:24:27,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707022203] [2021-05-02 18:24:27,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:24:27,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:27,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:24:27,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:24:27,586 INFO L87 Difference]: Start difference. First operand 76 states and 83 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:28,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:28,962 INFO L93 Difference]: Finished difference Result 78 states and 85 transitions. [2021-05-02 18:24:28,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:24:28,962 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 18:24:28,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:28,963 INFO L225 Difference]: With dead ends: 78 [2021-05-02 18:24:28,963 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 18:24:28,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1562.0ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:24:28,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 18:24:28,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 18:24:28,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 73 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:28,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2021-05-02 18:24:28,965 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 75 [2021-05-02 18:24:28,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:28,965 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2021-05-02 18:24:28,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:28,965 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2021-05-02 18:24:28,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:24:28,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:28,966 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:29,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:24:29,167 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:29,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:29,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1217583011, now seen corresponding path program 24 times [2021-05-02 18:24:29,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:29,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681284977] [2021-05-02 18:24:29,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:29,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:29,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:29,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:29,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:29,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:29,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681284977] [2021-05-02 18:24:29,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681284977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:29,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926296376] [2021-05-02 18:24:29,671 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:30,803 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:24:30,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:30,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 18:24:30,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:30,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:30,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:31,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:31,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:31,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:31,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 545 proven. 270 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-05-02 18:24:32,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926296376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:32,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:32,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 18] total 46 [2021-05-02 18:24:32,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103520882] [2021-05-02 18:24:32,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:24:32,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:32,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:24:32,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=1738, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:24:32,637 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 46 states, 46 states have (on average 2.1739130434782608) internal successors, (100), 45 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:36,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:36,073 INFO L93 Difference]: Finished difference Result 99 states and 109 transitions. [2021-05-02 18:24:36,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:24:36,073 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.1739130434782608) internal successors, (100), 45 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 18:24:36,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:36,074 INFO L225 Difference]: With dead ends: 99 [2021-05-02 18:24:36,074 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 18:24:36,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 62 SyntacticMatches, 9 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1253 ImplicationChecksByTransitivity, 4366.5ms TimeCoverageRelationStatistics Valid=1015, Invalid=6817, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 18:24:36,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 18:24:36,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 83. [2021-05-02 18:24:36,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:36,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 18:24:36,078 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 18:24:36,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:36,079 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 18:24:36,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.1739130434782608) internal successors, (100), 45 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:36,079 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 18:24:36,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 18:24:36,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:36,079 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:36,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:24:36,280 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:36,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:36,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1094035320, now seen corresponding path program 25 times [2021-05-02 18:24:36,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:36,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123692765] [2021-05-02 18:24:36,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:36,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:36,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:36,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:36,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:36,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:36,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123692765] [2021-05-02 18:24:36,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123692765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:36,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017472005] [2021-05-02 18:24:36,787 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:36,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:36,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:24:36,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:37,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:37,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:37,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:37,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017472005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:37,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:37,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:24:37,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966513941] [2021-05-02 18:24:37,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:24:37,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:37,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:24:37,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:24:37,041 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:38,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:38,662 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-02 18:24:38,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:24:38,662 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 18:24:38,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:38,663 INFO L225 Difference]: With dead ends: 85 [2021-05-02 18:24:38,663 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 18:24:38,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1373.4ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:24:38,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 18:24:38,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 18:24:38,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:38,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 18:24:38,666 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 18:24:38,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:38,666 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 18:24:38,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:38,666 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 18:24:38,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:24:38,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:38,666 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:38,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:38,881 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:38,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:38,881 INFO L82 PathProgramCache]: Analyzing trace with hash 2078082198, now seen corresponding path program 26 times [2021-05-02 18:24:38,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:38,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661858239] [2021-05-02 18:24:38,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:38,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:39,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:39,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:39,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661858239] [2021-05-02 18:24:39,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661858239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:39,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917911453] [2021-05-02 18:24:39,436 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:39,482 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:39,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:39,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-02 18:24:39,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:39,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:39,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917911453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:39,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:39,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 18:24:39,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566086000] [2021-05-02 18:24:39,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:24:39,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:39,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:24:39,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:24:39,936 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:42,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:42,123 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-02 18:24:42,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:24:42,124 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 18:24:42,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:42,125 INFO L225 Difference]: With dead ends: 87 [2021-05-02 18:24:42,125 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 18:24:42,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1916.5ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:24:42,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 18:24:42,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 18:24:42,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:42,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 18:24:42,128 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 18:24:42,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:42,128 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 18:24:42,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:42,128 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 18:24:42,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 18:24:42,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:42,129 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:42,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:24:42,341 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:42,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:42,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1440640460, now seen corresponding path program 27 times [2021-05-02 18:24:42,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:42,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257999714] [2021-05-02 18:24:42,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:42,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:42,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:42,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:42,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:42,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:42,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257999714] [2021-05-02 18:24:42,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257999714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:42,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718349498] [2021-05-02 18:24:42,993 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:43,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 18:24:43,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:43,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:24:43,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:43,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 18:24:43,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718349498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:43,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:43,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 18:24:43,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262664002] [2021-05-02 18:24:43,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:24:43,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:43,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:24:43,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1492, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:43,838 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:47,054 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:24:47,799 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:24:49,104 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:24:49,716 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:24:50,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:50,584 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-05-02 18:24:50,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:24:50,584 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 18:24:50,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:50,585 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:24:50,585 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:24:50,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 6441.5ms TimeCoverageRelationStatistics Valid=651, Invalid=5991, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:24:50,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:24:50,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-02 18:24:50,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:50,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 18:24:50,587 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2021-05-02 18:24:50,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:50,588 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 18:24:50,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:50,588 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 18:24:50,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:24:50,588 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:50,588 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:50,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:50,791 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:50,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:50,792 INFO L82 PathProgramCache]: Analyzing trace with hash 401045903, now seen corresponding path program 28 times [2021-05-02 18:24:50,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:50,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859466552] [2021-05-02 18:24:50,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:50,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:51,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:51,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:51,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:51,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859466552] [2021-05-02 18:24:51,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859466552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:51,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811413070] [2021-05-02 18:24:51,362 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:51,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:51,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:51,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:24:51,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:51,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:51,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:51,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:51,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811413070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:51,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:51,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:24:51,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043571742] [2021-05-02 18:24:51,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:24:51,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:51,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:24:51,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:24:51,629 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:53,521 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-02 18:24:53,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:24:53,522 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 18:24:53,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:53,522 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:24:53,522 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:24:53,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1588.1ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:24:53,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:24:53,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 18:24:53,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 18:24:53,525 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 18:24:53,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:53,525 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 18:24:53,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,525 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 18:24:53,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 18:24:53,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:53,526 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:53,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:24:53,726 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:53,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:53,727 INFO L82 PathProgramCache]: Analyzing trace with hash -135866195, now seen corresponding path program 29 times [2021-05-02 18:24:53,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:53,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373287981] [2021-05-02 18:24:53,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:53,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:54,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:54,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373287981] [2021-05-02 18:24:54,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373287981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:54,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127675916] [2021-05-02 18:24:54,364 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:02,317 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 18:25:02,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:02,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:25:02,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:03,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:03,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:03,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 442 proven. 1122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:25:03,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127675916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:03,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:03,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36] total 38 [2021-05-02 18:25:03,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115595102] [2021-05-02 18:25:03,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:25:03,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:03,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:25:03,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:25:03,096 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:05,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:05,249 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-02 18:25:05,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:25:05,250 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 18:25:05,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:05,250 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:25:05,250 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:25:05,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 70 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2323.0ms TimeCoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:25:05,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:25:05,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 18:25:05,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:05,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 18:25:05,252 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-02 18:25:05,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:05,253 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 18:25:05,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:05,253 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 18:25:05,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:25:05,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:05,253 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:05,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:25:05,458 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:05,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:05,459 INFO L82 PathProgramCache]: Analyzing trace with hash -712316853, now seen corresponding path program 30 times [2021-05-02 18:25:05,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:05,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907222841] [2021-05-02 18:25:05,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:05,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:06,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:06,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:25:06,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:06,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907222841] [2021-05-02 18:25:06,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907222841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:06,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227268019] [2021-05-02 18:25:06,169 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:11,401 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 18:25:11,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:11,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-02 18:25:11,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:11,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:11,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:11,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:11,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:11,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:13,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:13,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:15,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 655 proven. 924 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-05-02 18:25:15,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227268019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:15,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:15,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 33] total 61 [2021-05-02 18:25:15,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820256208] [2021-05-02 18:25:15,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 18:25:15,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:15,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 18:25:15,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=619, Invalid=3041, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 18:25:15,020 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 60 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:21,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:21,318 INFO L93 Difference]: Finished difference Result 129 states and 146 transitions. [2021-05-02 18:25:21,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 18:25:21,319 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 60 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-02 18:25:21,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:21,320 INFO L225 Difference]: With dead ends: 129 [2021-05-02 18:25:21,320 INFO L226 Difference]: Without dead ends: 129 [2021-05-02 18:25:21,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 68 SyntacticMatches, 13 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2572 ImplicationChecksByTransitivity, 8239.6ms TimeCoverageRelationStatistics Valid=1924, Invalid=12118, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 18:25:21,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-02 18:25:21,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 99. [2021-05-02 18:25:21,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:21,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 18:25:21,323 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 18:25:21,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:21,323 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 18:25:21,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 60 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:21,323 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 18:25:21,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 18:25:21,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:21,324 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:21,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:25:21,529 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:21,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:21,529 INFO L82 PathProgramCache]: Analyzing trace with hash 505554918, now seen corresponding path program 31 times [2021-05-02 18:25:21,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:21,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058243437] [2021-05-02 18:25:21,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:21,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:22,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:22,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:22,360 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:22,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058243437] [2021-05-02 18:25:22,360 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058243437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:22,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222235523] [2021-05-02 18:25:22,360 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:22,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:22,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:25:22,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:22,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:22,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:22,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222235523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:22,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:22,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:25:22,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876913590] [2021-05-02 18:25:22,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:25:22,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:22,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:25:22,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:25:22,666 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:25,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:25,236 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-02 18:25:25,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:25:25,237 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-02 18:25:25,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:25,238 INFO L225 Difference]: With dead ends: 101 [2021-05-02 18:25:25,238 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 18:25:25,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2168.6ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:25:25,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 18:25:25,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 18:25:25,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:25,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 18:25:25,241 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 18:25:25,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:25,241 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 18:25:25,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:25,242 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 18:25:25,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:25:25,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:25,242 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:25,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:25:25,465 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:25,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:25,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1415022852, now seen corresponding path program 32 times [2021-05-02 18:25:25,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:25,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206965416] [2021-05-02 18:25:25,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:25,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:26,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:26,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:26,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:26,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:26,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206965416] [2021-05-02 18:25:26,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206965416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:26,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412365080] [2021-05-02 18:25:26,293 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:26,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:25:26,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:26,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 18:25:26,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:26,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:25:26,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412365080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:26,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:26,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 18:25:26,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651803279] [2021-05-02 18:25:26,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:25:26,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:26,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:25:26,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:25:26,990 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:29,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:29,940 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-02 18:25:29,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:25:29,940 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-02 18:25:29,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:29,941 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:25:29,941 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 18:25:29,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2671.4ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:25:29,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 18:25:29,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 18:25:29,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:29,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:25:29,943 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 18:25:29,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:29,943 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:25:29,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:29,943 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:25:29,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:25:29,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:29,944 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:30,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:25:30,144 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:30,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:30,145 INFO L82 PathProgramCache]: Analyzing trace with hash -759620958, now seen corresponding path program 33 times [2021-05-02 18:25:30,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:30,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573018065] [2021-05-02 18:25:30,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:30,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:30,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:30,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:30,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:30,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:30,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573018065] [2021-05-02 18:25:30,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573018065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:30,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093825628] [2021-05-02 18:25:30,938 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:31,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 18:25:31,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:31,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:25:31,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:32,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:25:32,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093825628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:32,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:32,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 18:25:32,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017350171] [2021-05-02 18:25:32,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:25:32,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:32,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:25:32,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2222, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:25:32,732 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:37,152 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:25:40,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:40,440 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-02 18:25:40,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:25:40,441 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 18:25:40,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:40,441 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:25:40,441 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:25:40,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 98 SyntacticMatches, 5 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 7591.7ms TimeCoverageRelationStatistics Valid=673, Invalid=8833, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:25:40,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:25:40,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-02 18:25:40,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:40,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 18:25:40,443 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 18:25:40,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:40,443 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 18:25:40,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:40,444 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 18:25:40,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:25:40,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:40,444 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:40,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:25:40,647 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:40,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:40,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1430674819, now seen corresponding path program 34 times [2021-05-02 18:25:40,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:40,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188281858] [2021-05-02 18:25:40,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:40,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:41,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:41,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:41,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:41,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:41,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188281858] [2021-05-02 18:25:41,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188281858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:41,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809998396] [2021-05-02 18:25:41,482 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:41,534 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:25:41,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:41,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 18:25:41,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:41,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:41,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:41,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:41,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809998396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:41,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:41,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:25:41,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560062908] [2021-05-02 18:25:41,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:25:41,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:41,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:25:41,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:25:41,776 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:44,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:44,482 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 18:25:44,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:25:44,482 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 18:25:44,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:44,483 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:25:44,483 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:25:44,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2227.5ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:25:44,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:25:44,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 18:25:44,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:44,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 18:25:44,485 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 18:25:44,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:44,486 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 18:25:44,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:44,486 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 18:25:44,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:25:44,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:44,486 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:44,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:25:44,704 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:44,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:44,704 INFO L82 PathProgramCache]: Analyzing trace with hash 704841115, now seen corresponding path program 35 times [2021-05-02 18:25:44,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:44,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784491038] [2021-05-02 18:25:44,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:44,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:45,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:45,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:45,606 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:45,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:45,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784491038] [2021-05-02 18:25:45,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784491038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:45,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299911622] [2021-05-02 18:25:45,606 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:07,818 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 18:26:07,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:07,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:26:07,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:08,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:08,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:08,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 741 proven. 1482 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:26:08,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299911622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:08,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:08,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 43 [2021-05-02 18:26:08,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708533093] [2021-05-02 18:26:08,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:26:08,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:08,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:26:08,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:26:08,202 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:11,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:11,074 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-02 18:26:11,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:26:11,075 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 18:26:11,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:11,075 INFO L225 Difference]: With dead ends: 111 [2021-05-02 18:26:11,076 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 18:26:11,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 4 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2456.2ms TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 18:26:11,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 18:26:11,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 18:26:11,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:11,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 18:26:11,078 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 18:26:11,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:11,078 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 18:26:11,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:11,078 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 18:26:11,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:26:11,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:11,079 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:11,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:26:11,284 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:11,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:11,284 INFO L82 PathProgramCache]: Analyzing trace with hash -58713799, now seen corresponding path program 36 times [2021-05-02 18:26:11,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:11,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508204599] [2021-05-02 18:26:11,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:11,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:12,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:12,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:12,195 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:12,196 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:12,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508204599] [2021-05-02 18:26:12,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508204599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:12,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365298621] [2021-05-02 18:26:12,196 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:22,740 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 18:26:22,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:22,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 18:26:22,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:23,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-05-02 18:26:23,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365298621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:23,558 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:23,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14] total 54 [2021-05-02 18:26:23,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635446110] [2021-05-02 18:26:23,558 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:26:23,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:23,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:26:23,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=2407, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:26:23,559 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:26,992 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 45 [2021-05-02 18:26:28,103 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:26:29,203 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:26:30,094 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:26:30,884 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:26:33,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:33,805 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-05-02 18:26:33,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:26:33,806 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 18:26:33,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:33,806 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:26:33,807 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:26:33,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 10323.7ms TimeCoverageRelationStatistics Valid=1403, Invalid=9727, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:26:33,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:26:33,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2021-05-02 18:26:33,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 109 states have internal predecessors, (112), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:33,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 116 transitions. [2021-05-02 18:26:33,809 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 116 transitions. Word has length 109 [2021-05-02 18:26:33,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:33,809 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 116 transitions. [2021-05-02 18:26:33,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:33,809 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 116 transitions. [2021-05-02 18:26:33,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:26:33,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:33,810 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:34,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:34,017 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:34,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:34,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1967511892, now seen corresponding path program 37 times [2021-05-02 18:26:34,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:34,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193220371] [2021-05-02 18:26:34,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:34,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:35,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:35,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:35,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:35,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:35,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193220371] [2021-05-02 18:26:35,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193220371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:35,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051380216] [2021-05-02 18:26:35,017 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:35,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:35,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:26:35,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:35,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:35,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:35,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:35,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051380216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:35,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:35,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:26:35,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528491840] [2021-05-02 18:26:35,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:26:35,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:35,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:26:35,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:26:35,358 INFO L87 Difference]: Start difference. First operand 114 states and 116 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:38,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:38,537 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2021-05-02 18:26:38,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:26:38,538 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 18:26:38,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:38,538 INFO L225 Difference]: With dead ends: 116 [2021-05-02 18:26:38,538 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 18:26:38,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2615.9ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:26:38,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 18:26:38,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-05-02 18:26:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 states have internal predecessors, (114), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:38,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2021-05-02 18:26:38,541 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 113 [2021-05-02 18:26:38,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:38,541 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2021-05-02 18:26:38,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:38,541 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2021-05-02 18:26:38,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 18:26:38,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:38,542 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:38,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:38,745 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:38,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:38,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1921072754, now seen corresponding path program 38 times [2021-05-02 18:26:38,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:38,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086954655] [2021-05-02 18:26:38,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:38,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:39,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:39,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:39,735 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:39,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:39,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086954655] [2021-05-02 18:26:39,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086954655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:39,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114671026] [2021-05-02 18:26:39,736 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:39,789 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:26:39,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:39,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 18:26:39,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:40,574 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:26:40,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114671026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:40,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:40,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 18:26:40,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919042769] [2021-05-02 18:26:40,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:26:40,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:40,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:26:40,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:26:40,576 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:44,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:44,512 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-05-02 18:26:44,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:26:44,513 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-02 18:26:44,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:44,513 INFO L225 Difference]: With dead ends: 118 [2021-05-02 18:26:44,513 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 18:26:44,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3390.7ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:26:44,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 18:26:44,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-05-02 18:26:44,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:44,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 18:26:44,516 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 115 [2021-05-02 18:26:44,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:44,516 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 18:26:44,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:44,516 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 18:26:44,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:26:44,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:44,517 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:44,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:26:44,733 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:44,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:44,733 INFO L82 PathProgramCache]: Analyzing trace with hash 242734096, now seen corresponding path program 39 times [2021-05-02 18:26:44,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:44,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908628160] [2021-05-02 18:26:44,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:44,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:45,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:45,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:45,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:45,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:45,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908628160] [2021-05-02 18:26:45,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908628160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:45,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387649287] [2021-05-02 18:26:45,776 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:46,135 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 18:26:46,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:46,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:26:46,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:47,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 18:26:47,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387649287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:47,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:47,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 18:26:47,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376753746] [2021-05-02 18:26:47,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:26:47,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:47,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:26:47,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=2972, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:26:47,933 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:55,033 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:26:56,901 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:26:58,820 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:27:00,372 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:27:02,123 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:27:04,542 WARN L205 SmtUtils]: Spent 439.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:27:05,722 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:27:07,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:07,127 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-02 18:27:07,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:27:07,128 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-02 18:27:07,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:07,129 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:27:07,129 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:27:07,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 115 SyntacticMatches, 4 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1621 ImplicationChecksByTransitivity, 18370.2ms TimeCoverageRelationStatistics Valid=943, Invalid=11939, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:27:07,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:27:07,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-02 18:27:07,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:07,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 18:27:07,134 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-02 18:27:07,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:07,134 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 18:27:07,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:07,134 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 18:27:07,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 18:27:07,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:07,135 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:07,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:07,341 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:07,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:07,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1965210731, now seen corresponding path program 40 times [2021-05-02 18:27:07,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:07,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183448120] [2021-05-02 18:27:07,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:07,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:08,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:08,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:08,490 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:08,490 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:08,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183448120] [2021-05-02 18:27:08,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183448120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:08,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107487372] [2021-05-02 18:27:08,491 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:08,584 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:27:08,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:08,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 18:27:08,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:08,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:08,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:08,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:08,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107487372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:08,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:27:08,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:27:08,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737754530] [2021-05-02 18:27:08,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:27:08,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:27:08,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:27:08,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:27:08,907 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:12,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:12,695 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:27:12,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:27:12,696 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-02 18:27:12,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:12,696 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:27:12,696 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:27:12,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3005.0ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:27:12,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:27:12,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-02 18:27:12,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:12,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 18:27:12,699 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-02 18:27:12,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:12,699 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 18:27:12,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:12,699 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 18:27:12,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 18:27:12,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:12,700 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:12,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:12,916 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:12,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:12,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1731077001, now seen corresponding path program 41 times [2021-05-02 18:27:12,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:12,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439528729] [2021-05-02 18:27:12,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:12,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:14,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:14,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:14,092 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:14,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:14,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439528729] [2021-05-02 18:27:14,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439528729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:14,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096921969] [2021-05-02 18:27:14,092 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:48,020 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 18:27:48,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:48,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-02 18:27:48,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:49,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:49,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:49,857 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:27:49,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096921969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:49,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:27:49,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 18:27:49,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666621122] [2021-05-02 18:27:49,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:27:49,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:27:49,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:27:49,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:27:49,859 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:54,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:54,019 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-05-02 18:27:54,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:27:54,020 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-05-02 18:27:54,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:54,020 INFO L225 Difference]: With dead ends: 127 [2021-05-02 18:27:54,020 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 18:27:54,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 82 SyntacticMatches, 40 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 4667.7ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:27:54,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 18:27:54,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-02 18:27:54,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:54,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 18:27:54,023 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-02 18:27:54,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:54,023 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 18:27:54,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:54,023 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 18:27:54,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:27:54,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:54,024 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:54,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:27:54,232 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:54,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:54,232 INFO L82 PathProgramCache]: Analyzing trace with hash 66861863, now seen corresponding path program 42 times [2021-05-02 18:27:54,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:54,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078322027] [2021-05-02 18:27:54,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:54,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:55,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:55,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:55,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:55,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:55,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078322027] [2021-05-02 18:27:55,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078322027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:55,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78379239] [2021-05-02 18:27:55,477 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:15,801 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 18:28:15,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:15,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 18:28:15,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:16,912 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1188 proven. 169 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-05-02 18:28:16,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78379239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:16,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:16,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16] total 62 [2021-05-02 18:28:16,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654335729] [2021-05-02 18:28:16,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 18:28:16,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:16,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 18:28:16,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=585, Invalid=3197, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:28:16,914 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:21,555 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 45 [2021-05-02 18:28:24,116 WARN L205 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:28:26,331 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:28:27,913 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:28:29,573 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:28:31,804 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:28:32,824 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:28:33,865 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:28:34,692 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:28:35,244 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:28:36,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:36,891 INFO L93 Difference]: Finished difference Result 133 states and 137 transitions. [2021-05-02 18:28:36,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 18:28:36,892 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-02 18:28:36,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:36,893 INFO L225 Difference]: With dead ends: 133 [2021-05-02 18:28:36,893 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:28:36,894 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1924 ImplicationChecksByTransitivity, 20010.0ms TimeCoverageRelationStatistics Valid=1799, Invalid=12963, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 18:28:36,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:28:36,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-05-02 18:28:36,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:36,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-05-02 18:28:36,896 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 125 [2021-05-02 18:28:36,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:36,896 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-05-02 18:28:36,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:36,897 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-05-02 18:28:36,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 18:28:36,897 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:36,897 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:37,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:28:37,105 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:37,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:37,105 INFO L82 PathProgramCache]: Analyzing trace with hash 7355330, now seen corresponding path program 43 times [2021-05-02 18:28:37,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:37,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377655543] [2021-05-02 18:28:37,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:37,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:38,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:38,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:38,518 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:38,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:38,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377655543] [2021-05-02 18:28:38,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377655543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:38,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396188521] [2021-05-02 18:28:38,518 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:38,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:38,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 18:28:38,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:38,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:38,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:38,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:38,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396188521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:38,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:38,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:28:38,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408545319] [2021-05-02 18:28:38,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:28:38,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:38,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:28:38,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:28:38,925 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:43,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:43,546 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-05-02 18:28:43,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:28:43,547 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2021-05-02 18:28:43,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:43,548 INFO L225 Difference]: With dead ends: 132 [2021-05-02 18:28:43,548 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 18:28:43,548 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 3649.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:28:43,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 18:28:43,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-05-02 18:28:43,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:43,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-05-02 18:28:43,550 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 129 [2021-05-02 18:28:43,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:43,550 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-05-02 18:28:43,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:43,551 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-05-02 18:28:43,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:28:43,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:43,551 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:43,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:28:43,765 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:43,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:43,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1607883552, now seen corresponding path program 44 times [2021-05-02 18:28:43,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:43,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112047309] [2021-05-02 18:28:43,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:43,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:45,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:45,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:45,260 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:45,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:45,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112047309] [2021-05-02 18:28:45,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112047309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:45,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922312856] [2021-05-02 18:28:45,261 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:45,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:28:45,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:45,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 129 conjunts are in the unsatisfiable core [2021-05-02 18:28:45,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:28:46,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922312856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:46,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:46,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 18:28:46,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745388541] [2021-05-02 18:28:46,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 18:28:46,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:46,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 18:28:46,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:28:46,497 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:52,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:52,441 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2021-05-02 18:28:52,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:28:52,442 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 18:28:52,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:52,442 INFO L225 Difference]: With dead ends: 134 [2021-05-02 18:28:52,442 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 18:28:52,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 4963.7ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 18:28:52,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 18:28:52,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-02 18:28:52,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:52,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2021-05-02 18:28:52,445 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 131 [2021-05-02 18:28:52,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:52,445 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2021-05-02 18:28:52,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:52,445 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2021-05-02 18:28:52,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 18:28:52,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:52,446 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:52,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:52,661 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:52,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:52,661 INFO L82 PathProgramCache]: Analyzing trace with hash 925711998, now seen corresponding path program 45 times [2021-05-02 18:28:52,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:52,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235840850] [2021-05-02 18:28:52,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:52,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:54,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:54,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:54,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:54,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:54,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235840850] [2021-05-02 18:28:54,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235840850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:54,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043349616] [2021-05-02 18:28:54,162 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:54,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 18:28:54,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:54,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 18:28:54,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:54,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:56,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-02 18:28:56,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043349616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:56,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:56,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-02 18:28:56,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416728363] [2021-05-02 18:28:56,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:28:56,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:56,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:28:56,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=572, Invalid=3718, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:28:56,549 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:02,314 WARN L205 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 45 [2021-05-02 18:29:03,902 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:29:07,238 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:29:11,106 WARN L205 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:29:16,687 WARN L205 SmtUtils]: Spent 624.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:29:23,573 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:29:28,190 WARN L205 SmtUtils]: Spent 481.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:29:34,585 WARN L205 SmtUtils]: Spent 506.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:29:39,213 WARN L205 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:29:42,476 WARN L205 SmtUtils]: Spent 665.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:29:44,718 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:29:47,621 WARN L205 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:29:49,369 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:29:51,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:29:51,393 INFO L93 Difference]: Finished difference Result 141 states and 144 transitions. [2021-05-02 18:29:51,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 18:29:51,394 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-02 18:29:51,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:29:51,395 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:29:51,395 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:29:51,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2142 ImplicationChecksByTransitivity, 54901.6ms TimeCoverageRelationStatistics Valid=1533, Invalid=15237, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 18:29:51,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:29:51,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 18:29:51,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:51,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:29:51,398 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 18:29:51,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:29:51,398 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:29:51,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:51,398 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:29:51,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:29:51,399 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:29:51,399 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:29:51,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:29:51,604 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:29:51,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:29:51,605 INFO L82 PathProgramCache]: Analyzing trace with hash 722618201, now seen corresponding path program 46 times [2021-05-02 18:29:51,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:29:51,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375711319] [2021-05-02 18:29:51,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:29:51,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:53,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:29:53,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:29:53,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:29:53,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375711319] [2021-05-02 18:29:53,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375711319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:53,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887094977] [2021-05-02 18:29:53,808 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:29:53,869 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:29:53,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:29:53,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 18:29:53,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:29:54,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:29:54,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:29:54,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:29:54,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887094977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:54,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:29:54,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:29:54,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271307060] [2021-05-02 18:29:54,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:29:54,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:29:54,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:29:54,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:29:54,419 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:01,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:30:01,463 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-02 18:30:01,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:30:01,465 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 18:30:01,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:30:01,465 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:30:01,466 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:30:01,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 5357.6ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:30:01,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:30:01,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 18:30:01,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:01,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 18:30:01,469 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 18:30:01,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:30:01,470 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 18:30:01,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:01,470 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 18:30:01,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 18:30:01,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:30:01,471 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:30:01,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:30:01,684 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:30:01,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:30:01,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1935127159, now seen corresponding path program 47 times [2021-05-02 18:30:01,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:30:01,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153274722] [2021-05-02 18:30:01,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:30:01,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:04,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:30:04,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:04,423 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:30:04,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:30:04,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153274722] [2021-05-02 18:30:04,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153274722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:04,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204501244] [2021-05-02 18:30:04,424 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:30:55,718 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 18:30:55,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:30:55,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 18:30:55,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:30:56,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:56,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:56,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1045 proven. 2970 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:30:56,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204501244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:56,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:30:56,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 57] total 59 [2021-05-02 18:30:56,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550518358] [2021-05-02 18:30:56,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:30:56,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:30:56,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:30:56,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3257, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:30:56,876 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:31:05,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:31:05,051 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-02 18:31:05,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:31:05,052 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-02 18:31:05,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:31:05,053 INFO L225 Difference]: With dead ends: 143 [2021-05-02 18:31:05,053 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 18:31:05,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 131 SyntacticMatches, 5 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 6880.1ms TimeCoverageRelationStatistics Valid=415, Invalid=11357, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 18:31:05,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 18:31:05,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 18:31:05,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:31:05,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 18:31:05,056 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 18:31:05,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:31:05,056 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 18:31:05,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:31:05,056 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 18:31:05,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 18:31:05,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:31:05,057 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:31:05,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:31:05,258 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:31:05,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:31:05,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1074868715, now seen corresponding path program 48 times [2021-05-02 18:31:05,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:31:05,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135271888] [2021-05-02 18:31:05,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:31:05,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:07,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:31:07,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:07,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:31:07,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:31:07,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135271888] [2021-05-02 18:31:07,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135271888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:07,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525087405] [2021-05-02 18:31:07,642 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:31:39,963 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 18:31:39,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:31:39,981 WARN L261 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 173 conjunts are in the unsatisfiable core [2021-05-02 18:31:39,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:31:40,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:40,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:40,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:40,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:40,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:46,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:56,771 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1600 proven. 2334 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2021-05-02 18:31:56,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525087405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:56,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:31:56,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 50] total 94 [2021-05-02 18:31:56,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507659682] [2021-05-02 18:31:56,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-02 18:31:56,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:31:56,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-02 18:31:56,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1501, Invalid=7241, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:31:56,773 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 94 states, 94 states have (on average 2.0851063829787235) internal successors, (196), 93 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:09,522 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 45 [2021-05-02 18:32:27,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:32:27,610 INFO L93 Difference]: Finished difference Result 194 states and 219 transitions. [2021-05-02 18:32:27,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-02 18:32:27,610 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.0851063829787235) internal successors, (196), 93 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-02 18:32:27,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:32:27,611 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:32:27,611 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 18:32:27,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 101 SyntacticMatches, 20 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6535 ImplicationChecksByTransitivity, 37609.1ms TimeCoverageRelationStatistics Valid=4521, Invalid=29519, Unknown=0, NotChecked=0, Total=34040 [2021-05-02 18:32:27,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 18:32:27,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 148. [2021-05-02 18:32:27,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:27,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 18:32:27,615 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 141 [2021-05-02 18:32:27,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:32:27,615 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 18:32:27,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 2.0851063829787235) internal successors, (196), 93 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:27,616 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 18:32:27,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 18:32:27,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:32:27,616 INFO L523 BasicCegarLoop]: trace histogram [68, 51, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:32:27,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 18:32:27,826 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:32:27,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:32:27,826 INFO L82 PathProgramCache]: Analyzing trace with hash -189605651, now seen corresponding path program 49 times [2021-05-02 18:32:27,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:32:27,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976250582] [2021-05-02 18:32:27,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:32:27,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:31,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:32:31,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:31,231 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:32:31,231 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:32:31,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976250582] [2021-05-02 18:32:31,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976250582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:31,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380271625] [2021-05-02 18:32:31,232 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:32:31,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:31,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 18:32:31,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:32:32,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:32:32,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:32:32,284 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:32:32,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380271625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:32,285 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:32:32,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:32:32,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312916408] [2021-05-02 18:32:32,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:32:32,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:32:32,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:32:32,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:32:32,286 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:45,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:32:45,493 INFO L93 Difference]: Finished difference Result 150 states and 152 transitions. [2021-05-02 18:32:45,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:32:45,495 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 147 [2021-05-02 18:32:45,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:32:45,495 INFO L225 Difference]: With dead ends: 150 [2021-05-02 18:32:45,496 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 18:32:45,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 8796.7ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:32:45,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 18:32:45,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2021-05-02 18:32:45,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 145 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:45,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2021-05-02 18:32:45,499 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 147 [2021-05-02 18:32:45,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:32:45,499 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2021-05-02 18:32:45,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:32:45,499 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2021-05-02 18:32:45,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:32:45,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:32:45,500 INFO L523 BasicCegarLoop]: trace histogram [69, 52, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:32:45,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:32:45,718 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:32:45,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:32:45,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1950054027, now seen corresponding path program 50 times [2021-05-02 18:32:45,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:32:45,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142238292] [2021-05-02 18:32:45,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:32:45,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:49,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:32:49,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 2756 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:32:49,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:32:49,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142238292] [2021-05-02 18:32:49,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142238292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:49,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335510445] [2021-05-02 18:32:49,477 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:32:49,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:32:49,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:32:49,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 147 conjunts are in the unsatisfiable core [2021-05-02 18:32:49,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:32:52,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 0 proven. 4761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:32:52,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335510445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:52,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:32:52,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 72] total 74 [2021-05-02 18:32:52,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768040199] [2021-05-02 18:32:52,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 18:32:52,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:32:52,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 18:32:52,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5204, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:32:52,481 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:09,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:09,289 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2021-05-02 18:33:09,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:33:09,291 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-02 18:33:09,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:09,291 INFO L225 Difference]: With dead ends: 152 [2021-05-02 18:33:09,292 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 18:33:09,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1416 ImplicationChecksByTransitivity, 12128.1ms TimeCoverageRelationStatistics Valid=463, Invalid=15539, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 18:33:09,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 18:33:09,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-05-02 18:33:09,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:09,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2021-05-02 18:33:09,294 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 149 [2021-05-02 18:33:09,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:09,295 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2021-05-02 18:33:09,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:09,295 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2021-05-02 18:33:09,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-02 18:33:09,295 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:09,295 INFO L523 BasicCegarLoop]: trace histogram [70, 53, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:09,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 18:33:09,496 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:09,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:09,496 INFO L82 PathProgramCache]: Analyzing trace with hash 873669801, now seen corresponding path program 51 times [2021-05-02 18:33:09,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:09,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061837075] [2021-05-02 18:33:09,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:09,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:13,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:13,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:13,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1782 proven. 2862 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:33:13,164 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:13,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061837075] [2021-05-02 18:33:13,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061837075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:13,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101614861] [2021-05-02 18:33:13,164 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:15,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 18:33:15,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:15,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 18:33:15,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:25,852 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1855 proven. 289 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 18:33:25,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101614861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:25,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:25,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 20] total 75 [2021-05-02 18:33:25,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106181455] [2021-05-02 18:33:25,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 18:33:25,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:25,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 18:33:25,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=5154, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 18:33:25,854 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 74 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:45,024 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 45 [2021-05-02 18:33:45,742 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:33:47,522 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:33:49,276 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:33:51,159 WARN L205 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:33:54,719 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:33:58,376 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:01,148 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:04,694 WARN L205 SmtUtils]: Spent 813.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:07,662 WARN L205 SmtUtils]: Spent 423.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:10,109 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:13,546 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:17,150 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:20,679 WARN L205 SmtUtils]: Spent 616.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:24,166 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:27,813 WARN L205 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:34:30,254 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:34:31,198 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:34:32,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:32,406 INFO L93 Difference]: Finished difference Result 159 states and 162 transitions. [2021-05-02 18:34:32,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-02 18:34:32,410 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 74 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-02 18:34:32,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:32,410 INFO L225 Difference]: With dead ends: 159 [2021-05-02 18:34:32,410 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 18:34:32,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 146 SyntacticMatches, 7 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2738 ImplicationChecksByTransitivity, 61760.2ms TimeCoverageRelationStatistics Valid=1142, Invalid=20614, Unknown=0, NotChecked=0, Total=21756 [2021-05-02 18:34:32,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 18:34:32,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 157. [2021-05-02 18:34:32,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:32,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 18:34:32,413 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 151 [2021-05-02 18:34:32,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:32,413 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 18:34:32,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 74 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:32,413 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 18:34:32,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 18:34:32,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:32,414 INFO L523 BasicCegarLoop]: trace histogram [72, 54, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:32,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 18:34:32,615 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:32,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:32,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1171071812, now seen corresponding path program 52 times [2021-05-02 18:34:32,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:32,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575163329] [2021-05-02 18:34:32,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:32,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:37,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:37,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:37,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1925 proven. 2970 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 18:34:37,101 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:37,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575163329] [2021-05-02 18:34:37,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575163329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:37,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936721296] [2021-05-02 18:34:37,102 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:37,168 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:34:37,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:37,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 18:34:37,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:38,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:38,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:38,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1925 proven. 2970 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 18:34:38,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936721296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:38,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:38,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 18:34:38,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266025036] [2021-05-02 18:34:38,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:34:38,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:38,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:34:38,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:34:38,372 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:54,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:54,990 INFO L93 Difference]: Finished difference Result 159 states and 161 transitions. [2021-05-02 18:34:54,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 18:34:54,993 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-02 18:34:54,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:54,994 INFO L225 Difference]: With dead ends: 159 [2021-05-02 18:34:54,994 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 18:34:54,994 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 155 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 11040.0ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:34:54,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 18:34:54,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-05-02 18:34:54,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:54,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-02 18:34:54,996 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 155 [2021-05-02 18:34:54,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:54,996 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-02 18:34:54,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:54,996 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-02 18:34:54,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-02 18:34:54,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:54,997 INFO L523 BasicCegarLoop]: trace histogram [73, 55, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:55,197 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:55,197 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:55,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:55,198 INFO L82 PathProgramCache]: Analyzing trace with hash 933577442, now seen corresponding path program 53 times [2021-05-02 18:34:55,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:55,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534953752] [2021-05-02 18:34:55,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:55,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:59,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:59,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:59,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1960 proven. 3080 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 18:34:59,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:59,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534953752] [2021-05-02 18:34:59,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534953752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:59,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94799972] [2021-05-02 18:34:59,743 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:36:26,833 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 74 check-sat command(s) [2021-05-02 18:36:26,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:36:26,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 156 conjunts are in the unsatisfiable core [2021-05-02 18:36:26,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:36:33,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:36:33,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:36:33,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1960 proven. 3080 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 18:36:33,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94799972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:36:33,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:36:33,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-05-02 18:36:33,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263386181] [2021-05-02 18:36:33,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 18:36:33,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:36:33,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 18:36:33,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:36:33,557 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:36:49,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:36:49,287 INFO L93 Difference]: Finished difference Result 161 states and 163 transitions. [2021-05-02 18:36:49,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:36:49,289 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-05-02 18:36:49,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:36:49,290 INFO L225 Difference]: With dead ends: 161 [2021-05-02 18:36:49,290 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 18:36:49,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 115 SyntacticMatches, 44 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1629 ImplicationChecksByTransitivity, 16249.3ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 18:36:49,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 18:36:49,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2021-05-02 18:36:49,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:36:49,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2021-05-02 18:36:49,292 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 157 [2021-05-02 18:36:49,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:36:49,292 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2021-05-02 18:36:49,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:36:49,293 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2021-05-02 18:36:49,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-02 18:36:49,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:36:49,293 INFO L523 BasicCegarLoop]: trace histogram [74, 56, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:36:49,494 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 18:36:49,494 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:36:49,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:36:49,494 INFO L82 PathProgramCache]: Analyzing trace with hash 334754560, now seen corresponding path program 54 times [2021-05-02 18:36:49,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:36:49,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267787158] [2021-05-02 18:36:49,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:36:49,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:36:53,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:36:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:36:53,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5476 backedges. 1995 proven. 3192 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 18:36:53,932 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:36:53,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267787158] [2021-05-02 18:36:53,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267787158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:36:53,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611206955] [2021-05-02 18:36:53,932 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:37:46,544 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 75 check-sat command(s) [2021-05-02 18:37:46,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:37:46,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 126 conjunts are in the unsatisfiable core [2021-05-02 18:37:46,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:37:48,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:37:48,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:37:48,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5476 backedges. 1550 proven. 3782 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:37:48,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611206955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:37:48,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:37:48,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 64] total 66 [2021-05-02 18:37:48,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69153076] [2021-05-02 18:37:48,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:37:48,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:37:48,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:37:48,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4104, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:37:48,369 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)