/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/mono-crafted_12.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:48:47,675 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:48:47,678 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:48:47,718 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:48:47,719 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:48:47,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:48:47,725 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:48:47,731 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:48:47,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:48:47,738 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:48:47,739 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:48:47,740 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:48:47,740 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:48:47,741 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:48:47,742 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:48:47,743 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:48:47,744 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:48:47,744 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:48:47,746 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:48:47,747 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:48:47,748 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:48:47,749 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:48:47,750 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:48:47,751 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:48:47,753 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:48:47,759 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:48:47,760 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:48:47,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:48:47,771 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:48:47,782 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:48:47,782 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:48:47,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:48:47,783 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:48:47,784 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:48:47,784 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:48:47,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:48:47,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:48:47,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:48:47,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:48:47,785 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:48:47,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:48:47,785 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:48:47,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:48:47,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:48:47,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:48:47,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:48:47,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:48:47,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:48:47,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:48:47,787 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:48:47,788 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:48:47,788 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:48:48,083 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:48:48,100 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:48:48,102 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:48:48,103 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:48:48,104 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:48:48,105 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2021-05-02 18:48:48,172 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ddaeaa9c/cb47583b4b314ec38e7c9c71a09b7729/FLAG8ec11108d [2021-05-02 18:48:48,624 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:48:48,624 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2021-05-02 18:48:48,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ddaeaa9c/cb47583b4b314ec38e7c9c71a09b7729/FLAG8ec11108d [2021-05-02 18:48:49,048 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ddaeaa9c/cb47583b4b314ec38e7c9c71a09b7729 [2021-05-02 18:48:49,051 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:48:49,053 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:48:49,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:48:49,055 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:48:49,058 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:48:49,059 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,060 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@501a8d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49, skipping insertion in model container [2021-05-02 18:48:49,060 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:48:49,077 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:48:49,170 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/mono-crafted_12.c[319,332] [2021-05-02 18:48:49,178 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:48:49,185 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:48:49,229 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/mono-crafted_12.c[319,332] [2021-05-02 18:48:49,231 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:48:49,242 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:48:49,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49 WrapperNode [2021-05-02 18:48:49,242 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:48:49,243 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:48:49,243 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:48:49,243 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:48:49,250 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,251 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,255 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,258 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,261 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,262 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,263 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:48:49,263 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:48:49,264 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:48:49,264 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:48:49,264 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (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 18:48:49,331 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:48:49,331 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:48:49,331 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:48:49,331 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:48:49,331 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:48:49,332 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:48:49,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:48:49,333 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:48:49,333 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:48:49,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:48:49,535 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:48:49,536 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:48:49,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:48:49 BoogieIcfgContainer [2021-05-02 18:48:49,537 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:48:49,538 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:48:49,538 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:48:49,539 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:48:49,541 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:48:49" (1/1) ... [2021-05-02 18:48:49,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:48:49 BasicIcfg [2021-05-02 18:48:49,564 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:48:49,566 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:48:49,566 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:48:49,568 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:48:49,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:48:49" (1/4) ... [2021-05-02 18:48:49,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24ff99ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:48:49, skipping insertion in model container [2021-05-02 18:48:49,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:48:49" (2/4) ... [2021-05-02 18:48:49,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24ff99ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:48:49, skipping insertion in model container [2021-05-02 18:48:49,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:48:49" (3/4) ... [2021-05-02 18:48:49,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24ff99ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:48:49, skipping insertion in model container [2021-05-02 18:48:49,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:48:49" (4/4) ... [2021-05-02 18:48:49,574 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_12.cJordan [2021-05-02 18:48:49,578 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:48:49,581 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:48:49,595 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:48:49,620 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:48:49,620 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:48:49,620 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:48:49,620 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:48:49,620 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:48:49,620 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:48:49,620 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:48:49,620 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:48:49,635 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 18:48:49,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:48:49,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:49,642 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:49,643 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:49,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:49,648 INFO L82 PathProgramCache]: Analyzing trace with hash 447419557, now seen corresponding path program 1 times [2021-05-02 18:48:49,655 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:49,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721577091] [2021-05-02 18:48:49,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:49,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:49,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:49,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:49,892 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 18:48:49,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:49,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721577091] [2021-05-02 18:48:49,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721577091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:48:49,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:48:49,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:48:49,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369983796] [2021-05-02 18:48:49,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:48:49,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:49,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:48:49,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:48:49,925 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 18:48:49,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:49,960 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 18:48:49,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:48:49,962 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 18:48:49,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:49,974 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:48:49,974 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:48:49,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:48:49,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:48:49,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:48:50,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:50,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:48:50,002 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:48:50,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:50,002 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:48:50,003 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 18:48:50,003 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:48:50,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:48:50,004 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:50,004 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:50,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:48:50,005 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:50,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:50,006 INFO L82 PathProgramCache]: Analyzing trace with hash 448343078, now seen corresponding path program 1 times [2021-05-02 18:48:50,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:50,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594651458] [2021-05-02 18:48:50,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:50,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:50,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,139 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 18:48:50,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:50,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594651458] [2021-05-02 18:48:50,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594651458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:48:50,140 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:48:50,140 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:48:50,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193060845] [2021-05-02 18:48:50,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:48:50,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:50,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:48:50,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:48:50,142 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 18:48:50,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:50,296 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 18:48:50,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:48:50,297 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 18:48:50,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:50,297 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:48:50,298 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:48:50,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 137.7ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:48:50,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:48:50,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:48:50,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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 18:48:50,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 18:48:50,306 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 18:48:50,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:50,306 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 18:48:50,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 18:48:50,307 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 18:48:50,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:48:50,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:50,308 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:50,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:48:50,308 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:50,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:50,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1890769175, now seen corresponding path program 1 times [2021-05-02 18:48:50,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:50,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96368401] [2021-05-02 18:48:50,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:50,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:50,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:50,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:50,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96368401] [2021-05-02 18:48:50,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96368401] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:48:50,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:48:50,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:48:50,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701827671] [2021-05-02 18:48:50,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:48:50,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:50,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:48:50,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:48:50,449 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:50,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:50,504 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 18:48:50,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:48:50,505 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:48:50,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:50,505 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:48:50,506 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:48:50,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:48:50,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:48:50,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:48:50,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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 18:48:50,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 18:48:50,512 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 18:48:50,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:50,512 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 18:48:50,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:50,512 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 18:48:50,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:48:50,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:50,513 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:50,514 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:48:50,514 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:50,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:50,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1862314917, now seen corresponding path program 1 times [2021-05-02 18:48:50,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:50,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041801001] [2021-05-02 18:48:50,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:50,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:50,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:50,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:50,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041801001] [2021-05-02 18:48:50,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041801001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:50,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722959770] [2021-05-02 18:48:50,645 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 18:48:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:50,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:48:50,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:50,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:50,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722959770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:50,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:50,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:48:50,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753027971] [2021-05-02 18:48:50,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:48:50,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:50,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:48:50,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:48:50,773 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 18:48:50,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:50,900 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-02 18:48:50,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:48:50,901 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 17 [2021-05-02 18:48:50,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:50,903 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:48:50,903 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:48:50,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 114.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:48:50,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:48:50,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:48:50,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 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 18:48:50,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 18:48:50,912 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 18:48:50,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:50,912 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 18:48:50,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 18:48:50,912 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 18:48:50,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:48:50,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:50,913 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:51,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:51,129 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:51,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:51,129 INFO L82 PathProgramCache]: Analyzing trace with hash 290072151, now seen corresponding path program 2 times [2021-05-02 18:48:51,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:51,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043407615] [2021-05-02 18:48:51,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:51,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:51,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,236 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:51,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:51,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043407615] [2021-05-02 18:48:51,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043407615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:51,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280608819] [2021-05-02 18:48:51,237 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 18:48:51,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:51,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:51,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:48:51,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:51,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:51,381 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:51,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280608819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:51,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:51,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:48:51,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817627780] [2021-05-02 18:48:51,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:48:51,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:51,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:48:51,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:48:51,384 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 18:48:51,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:51,509 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 18:48:51,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:48:51,509 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 18:48:51,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:51,512 INFO L225 Difference]: With dead ends: 26 [2021-05-02 18:48:51,515 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 18:48:51,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 132.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:48:51,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 18:48:51,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 18:48:51,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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 18:48:51,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 18:48:51,521 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 18:48:51,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:51,522 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 18:48:51,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 18:48:51,522 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 18:48:51,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:48:51,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:51,527 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:51,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:51,753 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:51,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:51,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1775806875, now seen corresponding path program 3 times [2021-05-02 18:48:51,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:51,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738533079] [2021-05-02 18:48:51,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:51,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:51,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,890 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:51,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:51,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738533079] [2021-05-02 18:48:51,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738533079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:51,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688950319] [2021-05-02 18:48:51,890 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 18:48:51,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:48:51,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:51,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:48:51,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:52,054 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:48:52,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688950319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:52,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:52,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 18:48:52,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705226625] [2021-05-02 18:48:52,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:48:52,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:52,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:48:52,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:48:52,057 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:52,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:52,377 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:48:52,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:48:52,378 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:48:52,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:52,378 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:48:52,378 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:48:52,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 320.1ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:48:52,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:48:52,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 18:48:52,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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 18:48:52,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 18:48:52,382 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 18:48:52,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:52,382 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 18:48:52,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:52,382 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 18:48:52,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:48:52,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:52,383 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:52,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:52,605 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:52,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:52,605 INFO L82 PathProgramCache]: Analyzing trace with hash -460750842, now seen corresponding path program 4 times [2021-05-02 18:48:52,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:52,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588044694] [2021-05-02 18:48:52,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:52,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:52,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:52,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:52,727 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:48:52,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:52,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588044694] [2021-05-02 18:48:52,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588044694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:52,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438450893] [2021-05-02 18:48:52,728 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:52,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:48:52,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:52,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:48:52,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:52,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:52,852 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:48:52,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438450893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:52,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:52,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:48:52,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281846383] [2021-05-02 18:48:52,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:48:52,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:52,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:48:52,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:48:52,854 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:53,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:53,068 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:48:53,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:48:53,068 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:48:53,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:53,070 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:48:53,070 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 18:48:53,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 186.2ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:48:53,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 18:48:53,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 18:48:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:53,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 18:48:53,074 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 18:48:53,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:53,076 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 18:48:53,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:53,076 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 18:48:53,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:48:53,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:53,077 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:53,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:53,278 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:53,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:53,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1450803272, now seen corresponding path program 5 times [2021-05-02 18:48:53,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:53,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750741144] [2021-05-02 18:48:53,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:53,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:53,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:53,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:53,409 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:48:53,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:53,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750741144] [2021-05-02 18:48:53,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750741144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:53,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919343480] [2021-05-02 18:48:53,409 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:53,572 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 18:48:53,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:53,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:48:53,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:53,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:53,715 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:53,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919343480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:53,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:53,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 18:48:53,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090092751] [2021-05-02 18:48:53,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:48:53,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:53,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:48:53,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:48:53,719 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:54,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:54,050 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 18:48:54,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:48:54,050 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:48:54,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:54,051 INFO L225 Difference]: With dead ends: 41 [2021-05-02 18:48:54,051 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 18:48:54,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 311.4ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:48:54,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 18:48:54,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 18:48:54,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 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 18:48:54,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 18:48:54,055 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 18:48:54,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:54,055 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 18:48:54,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:54,056 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 18:48:54,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:48:54,056 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:54,056 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:54,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:54,260 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:54,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:54,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1671627528, now seen corresponding path program 6 times [2021-05-02 18:48:54,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:54,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387791008] [2021-05-02 18:48:54,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:54,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:54,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:54,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:54,397 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:48:54,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:54,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387791008] [2021-05-02 18:48:54,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387791008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:54,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724257608] [2021-05-02 18:48:54,398 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:54,486 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 18:48:54,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:54,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:48:54,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:54,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:54,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:54,614 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:48:54,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724257608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:54,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:54,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2021-05-02 18:48:54,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110615974] [2021-05-02 18:48:54,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:48:54,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:54,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:48:54,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:48:54,617 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:55,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:55,298 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:48:55,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:48:55,298 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 18:48:55,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:55,299 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:48:55,299 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:48:55,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 531.3ms TimeCoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:48:55,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:48:55,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 18:48:55,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 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 18:48:55,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 18:48:55,303 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 18:48:55,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:55,303 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 18:48:55,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:55,304 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 18:48:55,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:48:55,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:55,305 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:55,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:55,519 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:55,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:55,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1286439863, now seen corresponding path program 7 times [2021-05-02 18:48:55,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:55,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077963441] [2021-05-02 18:48:55,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:55,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:55,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:55,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:55,674 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:48:55,675 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:55,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077963441] [2021-05-02 18:48:55,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077963441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:55,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378542377] [2021-05-02 18:48:55,675 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:55,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:55,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:48:55,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:55,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:55,827 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:48:55,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378542377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:55,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:55,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 18:48:55,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972350430] [2021-05-02 18:48:55,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:48:55,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:55,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:48:55,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:48:55,829 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 18:48:56,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:56,259 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:48:56,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:48:56,260 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 44 [2021-05-02 18:48:56,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:56,260 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:48:56,261 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 18:48:56,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 345.5ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:48:56,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 18:48:56,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 18:48:56,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 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 18:48:56,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 18:48:56,264 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 18:48:56,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:56,265 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 18:48:56,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 18:48:56,265 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 18:48:56,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:48:56,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:56,266 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:56,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:48:56,481 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:56,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:56,481 INFO L82 PathProgramCache]: Analyzing trace with hash -1818302011, now seen corresponding path program 8 times [2021-05-02 18:48:56,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:56,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878655314] [2021-05-02 18:48:56,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:56,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:56,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:56,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:56,678 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:48:56,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:56,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878655314] [2021-05-02 18:48:56,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878655314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:56,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92522329] [2021-05-02 18:48:56,679 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:56,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:56,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:56,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:48:56,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:56,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:56,840 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:48:56,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92522329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:56,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:56,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:48:56,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839864008] [2021-05-02 18:48:56,842 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:48:56,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:56,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:48:56,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:48:56,843 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 18:48:57,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:57,335 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-05-02 18:48:57,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:48:57,336 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 47 [2021-05-02 18:48:57,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:57,336 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:48:57,337 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:48:57,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 407.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:48:57,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:48:57,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 18:48:57,339 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 18:48:57,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 18:48:57,339 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 18:48:57,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:57,339 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 18:48:57,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 18:48:57,340 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 18:48:57,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 18:48:57,340 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:57,340 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:57,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 18:48:57,545 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:57,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:57,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1232216311, now seen corresponding path program 9 times [2021-05-02 18:48:57,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:57,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469138458] [2021-05-02 18:48:57,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:57,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:57,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:57,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:57,717 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:48:57,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:57,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469138458] [2021-05-02 18:48:57,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469138458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:57,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422255828] [2021-05-02 18:48:57,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:57,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 18:48:57,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:57,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:48:57,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:57,951 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:48:57,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422255828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:57,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:57,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2021-05-02 18:48:57,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135496800] [2021-05-02 18:48:57,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:48:57,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:57,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:48:57,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:48:57,953 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:58,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:58,881 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:48:58,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:48:58,881 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 18:48:58,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:58,882 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:48:58,882 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:48:58,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 708.4ms TimeCoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:48:58,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:48:58,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 18:48:58,885 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 18:48:58,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 18:48:58,886 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 18:48:58,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:58,886 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 18:48:58,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:58,886 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 18:48:58,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 18:48:58,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:58,887 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:59,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:59,101 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:59,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:59,101 INFO L82 PathProgramCache]: Analyzing trace with hash 764014680, now seen corresponding path program 10 times [2021-05-02 18:48:59,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:59,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616467608] [2021-05-02 18:48:59,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:59,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:59,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:59,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:59,330 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:48:59,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:59,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616467608] [2021-05-02 18:48:59,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616467608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:59,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707702223] [2021-05-02 18:48:59,331 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 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 18:48:59,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:48:59,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:59,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:48:59,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:59,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:59,526 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:48:59,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707702223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:59,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:59,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:48:59,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722994947] [2021-05-02 18:48:59,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:48:59,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:59,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:48:59,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:48:59,529 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 18:49:00,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:00,071 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:49:00,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:49:00,071 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 56 [2021-05-02 18:49:00,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:00,072 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:49:00,072 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:49:00,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 452.7ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:49:00,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:49:00,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 18:49:00,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 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 18:49:00,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 18:49:00,076 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 18:49:00,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:00,076 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 18:49:00,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 18:49:00,076 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 18:49:00,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:49:00,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:00,077 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:00,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:00,293 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:00,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:00,294 INFO L82 PathProgramCache]: Analyzing trace with hash -759385754, now seen corresponding path program 11 times [2021-05-02 18:49:00,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:00,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303514535] [2021-05-02 18:49:00,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:00,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:00,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:00,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:00,506 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:49:00,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:00,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303514535] [2021-05-02 18:49:00,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303514535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:00,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793375054] [2021-05-02 18:49:00,507 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 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 18:49:01,327 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:49:01,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:01,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:49:01,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:01,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:01,538 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 31 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:49:01,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793375054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:01,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:01,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 20 [2021-05-02 18:49:01,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866591188] [2021-05-02 18:49:01,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:49:01,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:01,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:49:01,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:49:01,540 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 18:49:02,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:02,364 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2021-05-02 18:49:02,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:49:02,364 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 18:49:02,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:02,365 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:49:02,365 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 18:49:02,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 653.3ms TimeCoverageRelationStatistics Valid=127, Invalid=1133, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:49:02,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 18:49:02,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 18:49:02,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.088235294117647) internal successors, (74), 68 states have internal predecessors, (74), 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 18:49:02,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-05-02 18:49:02,382 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 59 [2021-05-02 18:49:02,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:02,383 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-05-02 18:49:02,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 18:49:02,383 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-05-02 18:49:02,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:49:02,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:02,384 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:02,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:49:02,585 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:02,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:02,585 INFO L82 PathProgramCache]: Analyzing trace with hash 429922022, now seen corresponding path program 12 times [2021-05-02 18:49:02,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:02,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414918609] [2021-05-02 18:49:02,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:02,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:02,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:02,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:02,886 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:49:02,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:02,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414918609] [2021-05-02 18:49:02,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414918609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:02,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294096199] [2021-05-02 18:49:02,886 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 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 18:49:03,020 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 18:49:03,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:03,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:49:03,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:03,277 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-05-02 18:49:03,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294096199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:03,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:03,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9] total 27 [2021-05-02 18:49:03,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526203889] [2021-05-02 18:49:03,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:49:03,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:03,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:49:03,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:49:03,279 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:04,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:04,763 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2021-05-02 18:49:04,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:49:04,763 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 18:49:04,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:04,765 INFO L225 Difference]: With dead ends: 83 [2021-05-02 18:49:04,765 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 18:49:04,767 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 1101.7ms TimeCoverageRelationStatistics Valid=231, Invalid=2319, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:49:04,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 18:49:04,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 18:49:04,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 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 18:49:04,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-05-02 18:49:04,777 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 71 [2021-05-02 18:49:04,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:04,777 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-05-02 18:49:04,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 25 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:04,777 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-05-02 18:49:04,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:49:04,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:04,779 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:05,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:49:05,000 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:05,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:05,001 INFO L82 PathProgramCache]: Analyzing trace with hash -629616667, now seen corresponding path program 13 times [2021-05-02 18:49:05,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:05,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616757976] [2021-05-02 18:49:05,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:05,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:05,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:05,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:49:05,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:05,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616757976] [2021-05-02 18:49:05,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616757976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:05,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439918764] [2021-05-02 18:49:05,334 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 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 18:49:05,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:05,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:49:05,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:05,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:05,563 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:49:05,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439918764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:05,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:05,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 18:49:05,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896177549] [2021-05-02 18:49:05,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:49:05,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:05,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:49:05,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:49:05,565 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 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 18:49:06,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:06,641 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2021-05-02 18:49:06,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:49:06,646 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 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 77 [2021-05-02 18:49:06,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:06,646 INFO L225 Difference]: With dead ends: 83 [2021-05-02 18:49:06,646 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 18:49:06,647 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 818.0ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:49:06,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 18:49:06,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 18:49:06,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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 18:49:06,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-05-02 18:49:06,650 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 77 [2021-05-02 18:49:06,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:06,650 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-05-02 18:49:06,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 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 18:49:06,651 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-05-02 18:49:06,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 18:49:06,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:06,652 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:06,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 18:49:06,861 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:06,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:06,861 INFO L82 PathProgramCache]: Analyzing trace with hash -175578217, now seen corresponding path program 14 times [2021-05-02 18:49:06,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:06,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074222145] [2021-05-02 18:49:06,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:06,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:07,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:07,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:07,188 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 261 proven. 495 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:49:07,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:07,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074222145] [2021-05-02 18:49:07,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074222145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:07,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134997648] [2021-05-02 18:49:07,189 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 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 18:49:07,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:49:07,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:07,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 18:49:07,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:07,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:07,420 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 261 proven. 495 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:49:07,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134997648] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:07,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:07,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:49:07,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751778082] [2021-05-02 18:49:07,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:49:07,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:07,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:49:07,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:49:07,423 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 18:49:08,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:08,376 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2021-05-02 18:49:08,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:49:08,376 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 80 [2021-05-02 18:49:08,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:08,377 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:49:08,377 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:49:08,377 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 780.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:49:08,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:49:08,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 18:49:08,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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 18:49:08,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 91 transitions. [2021-05-02 18:49:08,380 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 91 transitions. Word has length 80 [2021-05-02 18:49:08,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:08,380 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 91 transitions. [2021-05-02 18:49:08,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 18:49:08,381 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 91 transitions. [2021-05-02 18:49:08,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:49:08,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:08,382 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:08,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:08,593 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:08,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:08,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1231870629, now seen corresponding path program 15 times [2021-05-02 18:49:08,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:08,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242982728] [2021-05-02 18:49:08,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:08,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:08,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:08,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:08,943 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 275 proven. 551 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:49:08,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:08,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242982728] [2021-05-02 18:49:08,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242982728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:08,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821250147] [2021-05-02 18:49:08,944 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 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 18:49:09,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 18:49:09,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:09,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:49:09,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:09,301 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-05-02 18:49:09,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821250147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:09,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:09,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 31 [2021-05-02 18:49:09,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494052563] [2021-05-02 18:49:09,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:49:09,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:09,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:49:09,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=852, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:49:09,303 INFO L87 Difference]: Start difference. First operand 85 states and 91 transitions. Second operand has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:10,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:10,885 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2021-05-02 18:49:10,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:49:10,886 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:49:10,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:10,886 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:49:10,886 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 18:49:10,887 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 1347.9ms TimeCoverageRelationStatistics Valid=270, Invalid=3152, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:49:10,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 18:49:10,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 18:49:10,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 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 18:49:10,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-05-02 18:49:10,889 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 83 [2021-05-02 18:49:10,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:10,890 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-05-02 18:49:10,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 29 states have internal predecessors, (91), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:10,890 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-05-02 18:49:10,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:49:10,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:10,891 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:11,097 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:49:11,098 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:11,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:11,098 INFO L82 PathProgramCache]: Analyzing trace with hash -707257658, now seen corresponding path program 16 times [2021-05-02 18:49:11,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:11,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106534171] [2021-05-02 18:49:11,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:11,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:11,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:11,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:11,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:49:11,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:11,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106534171] [2021-05-02 18:49:11,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106534171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:11,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995626498] [2021-05-02 18:49:11,448 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 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 18:49:11,490 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:49:11,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:11,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:49:11,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:11,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:11,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:49:11,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995626498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:11,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:11,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:49:11,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141332538] [2021-05-02 18:49:11,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:49:11,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:11,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:49:11,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:49:11,662 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:49:12,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:12,805 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2021-05-02 18:49:12,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:49:12,805 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:49:12,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:12,806 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:49:12,806 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:49:12,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 877.9ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:49:12,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:49:12,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 18:49:12,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0898876404494382) internal successors, (97), 89 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 18:49:12,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2021-05-02 18:49:12,808 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 89 [2021-05-02 18:49:12,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:12,809 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2021-05-02 18:49:12,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:49:12,809 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2021-05-02 18:49:12,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 18:49:12,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:12,810 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:13,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:13,028 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:13,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:13,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1769878392, now seen corresponding path program 17 times [2021-05-02 18:49:13,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:13,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626031796] [2021-05-02 18:49:13,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:13,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:13,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:13,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:13,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:49:13,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:13,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626031796] [2021-05-02 18:49:13,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626031796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:13,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008242981] [2021-05-02 18:49:13,506 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 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 18:49:19,579 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 18:49:19,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:19,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:49:19,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:19,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:20,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:49:20,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008242981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:20,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:20,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:49:20,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271566820] [2021-05-02 18:49:20,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:49:20,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:20,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:49:20,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:49:20,003 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 18:49:21,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:21,301 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2021-05-02 18:49:21,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:49:21,302 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 92 [2021-05-02 18:49:21,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:21,302 INFO L225 Difference]: With dead ends: 98 [2021-05-02 18:49:21,302 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 18:49:21,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 75 SyntacticMatches, 20 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 1285.4ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:49:21,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 18:49:21,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 18:49:21,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0869565217391304) internal successors, (100), 92 states have internal predecessors, (100), 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 18:49:21,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2021-05-02 18:49:21,305 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 92 [2021-05-02 18:49:21,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:21,305 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2021-05-02 18:49:21,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 18:49:21,305 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2021-05-02 18:49:21,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 18:49:21,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:21,306 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:21,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:21,507 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:21,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:21,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2001864070, now seen corresponding path program 18 times [2021-05-02 18:49:21,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:21,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231198290] [2021-05-02 18:49:21,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:21,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:21,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:21,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:21,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 385 proven. 737 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:49:21,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:21,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231198290] [2021-05-02 18:49:21,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231198290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:21,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086952350] [2021-05-02 18:49:21,918 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 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 18:49:22,402 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 18:49:22,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:22,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:49:22,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:22,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 18:49:22,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086952350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:22,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:22,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11] total 35 [2021-05-02 18:49:22,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686028694] [2021-05-02 18:49:22,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:49:22,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:22,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:49:22,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:49:22,731 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:24,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:24,978 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-05-02 18:49:24,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:49:24,979 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 18:49:24,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:24,979 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:49:24,979 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 18:49:24,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1656.4ms TimeCoverageRelationStatistics Valid=309, Invalid=4113, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 18:49:24,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 18:49:24,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 18:49:24,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0918367346938775) internal successors, (107), 98 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 18:49:24,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-05-02 18:49:24,983 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 95 [2021-05-02 18:49:24,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:24,983 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-05-02 18:49:24,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 33 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:24,983 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-05-02 18:49:24,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:49:24,984 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:24,984 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:25,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 18:49:25,190 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:25,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:25,190 INFO L82 PathProgramCache]: Analyzing trace with hash -189754555, now seen corresponding path program 19 times [2021-05-02 18:49:25,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:25,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922729050] [2021-05-02 18:49:25,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:25,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:25,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:25,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:25,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:49:25,654 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:25,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922729050] [2021-05-02 18:49:25,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922729050] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:25,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054922949] [2021-05-02 18:49:25,655 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 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 18:49:25,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:25,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:49:25,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:25,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:49:25,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054922949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:25,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:25,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:49:25,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476461788] [2021-05-02 18:49:25,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:49:25,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:25,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:49:25,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:49:25,908 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:49:27,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:27,303 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-05-02 18:49:27,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:49:27,305 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:49:27,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:27,306 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:49:27,306 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:49:27,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1073.0ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:49:27,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:49:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 18:49:27,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 101 states have internal predecessors, (110), 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 18:49:27,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 18:49:27,308 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 101 [2021-05-02 18:49:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:27,309 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 18:49:27,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:49:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 18:49:27,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:49:27,309 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:27,309 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:27,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:27,510 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:27,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:27,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1594700023, now seen corresponding path program 20 times [2021-05-02 18:49:27,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:27,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035230559] [2021-05-02 18:49:27,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:27,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:27,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:27,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:27,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:49:27,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:27,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035230559] [2021-05-02 18:49:27,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035230559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:27,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518296036] [2021-05-02 18:49:27,977 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 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 18:49:28,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:49:28,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:28,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 18:49:28,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:28,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:28,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:49:28,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518296036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:28,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:28,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:49:28,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479395768] [2021-05-02 18:49:28,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:49:28,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:28,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:49:28,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:49:28,250 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 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 18:49:29,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:29,858 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2021-05-02 18:49:29,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:49:29,858 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 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 104 [2021-05-02 18:49:29,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:29,859 INFO L225 Difference]: With dead ends: 110 [2021-05-02 18:49:29,859 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 18:49:29,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1219.6ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:49:29,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 18:49:29,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 18:49:29,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 104 states have internal predecessors, (113), 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 18:49:29,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 117 transitions. [2021-05-02 18:49:29,861 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 117 transitions. Word has length 104 [2021-05-02 18:49:29,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:29,862 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 117 transitions. [2021-05-02 18:49:29,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 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 18:49:29,862 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 117 transitions. [2021-05-02 18:49:29,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:49:29,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:29,863 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:30,085 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:49:30,085 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:30,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:30,086 INFO L82 PathProgramCache]: Analyzing trace with hash -824156667, now seen corresponding path program 21 times [2021-05-02 18:49:30,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:30,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469950806] [2021-05-02 18:49:30,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:30,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:30,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:30,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:30,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:49:30,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:30,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469950806] [2021-05-02 18:49:30,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469950806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:30,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197641152] [2021-05-02 18:49:30,598 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 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 18:49:30,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 18:49:30,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:30,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:49:30,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:31,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2021-05-02 18:49:31,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197641152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:31,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:31,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 12] total 39 [2021-05-02 18:49:31,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097076755] [2021-05-02 18:49:31,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:49:31,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:31,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:49:31,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1382, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:49:31,077 INFO L87 Difference]: Start difference. First operand 109 states and 117 transitions. Second operand has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:33,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:33,741 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2021-05-02 18:49:33,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 18:49:33,742 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:49:33,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:33,743 INFO L225 Difference]: With dead ends: 119 [2021-05-02 18:49:33,743 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 18:49:33,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1935.5ms TimeCoverageRelationStatistics Valid=348, Invalid=5202, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 18:49:33,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 18:49:33,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 18:49:33,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0909090909090908) internal successors, (120), 110 states have internal predecessors, (120), 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 18:49:33,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2021-05-02 18:49:33,746 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 107 [2021-05-02 18:49:33,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:33,747 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2021-05-02 18:49:33,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:33,747 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2021-05-02 18:49:33,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:49:33,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:33,748 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 26, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:33,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 18:49:33,961 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:33,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:33,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1886130534, now seen corresponding path program 22 times [2021-05-02 18:49:33,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:33,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258992984] [2021-05-02 18:49:33,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:33,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:34,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:34,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:34,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:49:34,490 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:34,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258992984] [2021-05-02 18:49:34,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258992984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:34,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108926241] [2021-05-02 18:49:34,491 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 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 18:49:34,555 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:49:34,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:34,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 18:49:34,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:34,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:34,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:49:34,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108926241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:34,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:34,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 18:49:34,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900581893] [2021-05-02 18:49:34,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:49:34,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:34,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:49:34,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:49:34,765 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 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 18:49:36,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:36,555 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2021-05-02 18:49:36,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 18:49:36,556 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 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 18:49:36,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:36,556 INFO L225 Difference]: With dead ends: 119 [2021-05-02 18:49:36,556 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 18:49:36,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1288.4ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:49:36,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 18:49:36,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-05-02 18:49:36,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0884955752212389) internal successors, (123), 113 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 18:49:36,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2021-05-02 18:49:36,560 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 113 [2021-05-02 18:49:36,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:36,560 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2021-05-02 18:49:36,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 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 18:49:36,561 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2021-05-02 18:49:36,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 18:49:36,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:36,561 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:36,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:36,765 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:36,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:36,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1658827800, now seen corresponding path program 23 times [2021-05-02 18:49:36,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:36,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620475995] [2021-05-02 18:49:36,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:36,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:37,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:37,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:49:37,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:37,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620475995] [2021-05-02 18:49:37,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620475995] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:37,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762648215] [2021-05-02 18:49:37,359 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 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 18:49:44,473 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 18:49:44,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:44,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 92 conjunts are in the unsatisfiable core [2021-05-02 18:49:44,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:44,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:49:44,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762648215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:44,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:44,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 33 [2021-05-02 18:49:44,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611654996] [2021-05-02 18:49:44,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:49:44,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:44,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:49:44,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:49:44,958 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 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 18:49:46,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:46,860 INFO L93 Difference]: Finished difference Result 122 states and 131 transitions. [2021-05-02 18:49:46,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:49:46,860 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 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 116 [2021-05-02 18:49:46,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:46,861 INFO L225 Difference]: With dead ends: 122 [2021-05-02 18:49:46,861 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 18:49:46,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 98 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 1685.5ms TimeCoverageRelationStatistics Valid=240, Invalid=3542, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:49:46,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 18:49:46,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 18:49:46,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0862068965517242) internal successors, (126), 116 states have internal predecessors, (126), 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 18:49:46,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 130 transitions. [2021-05-02 18:49:46,865 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 130 transitions. Word has length 116 [2021-05-02 18:49:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:46,865 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 130 transitions. [2021-05-02 18:49:46,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 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 18:49:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 130 transitions. [2021-05-02 18:49:46,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 18:49:46,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:46,866 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:47,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 18:49:47,074 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:47,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:47,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1048462298, now seen corresponding path program 24 times [2021-05-02 18:49:47,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:47,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610372849] [2021-05-02 18:49:47,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:47,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:47,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:47,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:47,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:49:47,661 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:47,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610372849] [2021-05-02 18:49:47,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610372849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:47,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004917898] [2021-05-02 18:49:47,662 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 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 18:49:48,382 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 18:49:48,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:48,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 18:49:48,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:48,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:49:48,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004917898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:48,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:48,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 13] total 43 [2021-05-02 18:49:48,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675872361] [2021-05-02 18:49:48,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:49:48,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:48,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:49:48,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1695, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:49:48,871 INFO L87 Difference]: Start difference. First operand 121 states and 130 transitions. Second operand has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:52,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:52,143 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2021-05-02 18:49:52,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:49:52,143 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 18:49:52,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:52,144 INFO L225 Difference]: With dead ends: 131 [2021-05-02 18:49:52,144 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 18:49:52,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 2341.8ms TimeCoverageRelationStatistics Valid=387, Invalid=6419, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 18:49:52,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 18:49:52,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 18:49:52,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0901639344262295) internal successors, (133), 122 states have internal predecessors, (133), 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 18:49:52,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2021-05-02 18:49:52,149 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 119 [2021-05-02 18:49:52,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:52,149 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2021-05-02 18:49:52,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.953488372093023) internal successors, (127), 41 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:52,149 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2021-05-02 18:49:52,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:49:52,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:52,150 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 29, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:52,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:52,355 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:52,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:52,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1443656027, now seen corresponding path program 25 times [2021-05-02 18:49:52,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:52,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422570655] [2021-05-02 18:49:52,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:52,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:52,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:52,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:52,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 771 proven. 1276 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:52,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:52,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422570655] [2021-05-02 18:49:52,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422570655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:52,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388706338] [2021-05-02 18:49:52,938 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 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 18:49:53,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:53,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 18:49:53,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:53,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:53,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 771 proven. 1276 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:53,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388706338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:53,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:53,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 18:49:53,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057702216] [2021-05-02 18:49:53,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:49:53,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:53,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:49:53,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:49:53,250 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 18:49:55,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:55,389 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2021-05-02 18:49:55,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 18:49:55,391 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 18:49:55,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:55,392 INFO L225 Difference]: With dead ends: 131 [2021-05-02 18:49:55,392 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 18:49:55,392 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1498.1ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:49:55,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 18:49:55,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-05-02 18:49:55,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.088) internal successors, (136), 125 states have internal predecessors, (136), 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 18:49:55,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 140 transitions. [2021-05-02 18:49:55,395 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 140 transitions. Word has length 125 [2021-05-02 18:49:55,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:55,395 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 140 transitions. [2021-05-02 18:49:55,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 18:49:55,395 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 140 transitions. [2021-05-02 18:49:55,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 18:49:55,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:55,396 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:55,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:49:55,601 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:55,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:55,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1226749527, now seen corresponding path program 26 times [2021-05-02 18:49:55,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:55,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724743478] [2021-05-02 18:49:55,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:55,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:56,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:56,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 797 proven. 1365 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:56,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:56,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724743478] [2021-05-02 18:49:56,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724743478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:56,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121454495] [2021-05-02 18:49:56,263 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 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 18:49:56,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:49:56,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:56,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 18:49:56,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:56,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:56,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 797 proven. 1365 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:56,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121454495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:56,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:56,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:49:56,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998875505] [2021-05-02 18:49:56,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:49:56,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:56,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:49:56,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:49:56,572 INFO L87 Difference]: Start difference. First operand 130 states and 140 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 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 18:49:58,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:58,808 INFO L93 Difference]: Finished difference Result 134 states and 144 transitions. [2021-05-02 18:49:58,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:49:58,808 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 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 128 [2021-05-02 18:49:58,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:58,809 INFO L225 Difference]: With dead ends: 134 [2021-05-02 18:49:58,809 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 18:49:58,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1624.6ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:49:58,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 18:49:58,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 18:49:58,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 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 18:49:58,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 18:49:58,812 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 128 [2021-05-02 18:49:58,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:58,813 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 18:49:58,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 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 18:49:58,813 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 18:49:58,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:49:58,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:58,813 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:59,014 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:49:59,014 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:59,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:59,014 INFO L82 PathProgramCache]: Analyzing trace with hash -400615067, now seen corresponding path program 27 times [2021-05-02 18:49:59,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:59,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969271592] [2021-05-02 18:49:59,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:59,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:59,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:59,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:59,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:59,700 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:59,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969271592] [2021-05-02 18:49:59,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969271592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:59,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385665191] [2021-05-02 18:49:59,700 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 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 18:49:59,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:49:59,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:59,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:49:59,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:50:00,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 923 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2021-05-02 18:50:00,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385665191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:00,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:50:00,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14] total 47 [2021-05-02 18:50:00,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707976680] [2021-05-02 18:50:00,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:50:00,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:50:00,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:50:00,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:50:00,403 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:50:03,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:50:03,869 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2021-05-02 18:50:03,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:50:03,869 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:50:03,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:50:03,870 INFO L225 Difference]: With dead ends: 143 [2021-05-02 18:50:03,870 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 18:50:03,871 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 2730.7ms TimeCoverageRelationStatistics Valid=426, Invalid=7764, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 18:50:03,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 18:50:03,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 18:50:03,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 134 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 18:50:03,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2021-05-02 18:50:03,874 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 131 [2021-05-02 18:50:03,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:50:03,874 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2021-05-02 18:50:03,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 45 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:50:03,874 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2021-05-02 18:50:03,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:50:03,875 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:50:03,875 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 32, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:50:04,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:04,080 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:50:04,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:50:04,080 INFO L82 PathProgramCache]: Analyzing trace with hash 629657606, now seen corresponding path program 28 times [2021-05-02 18:50:04,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:50:04,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199879338] [2021-05-02 18:50:04,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:50:04,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:04,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:50:04,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:04,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 947 proven. 1552 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:50:04,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:50:04,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199879338] [2021-05-02 18:50:04,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199879338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:04,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289279065] [2021-05-02 18:50:04,810 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 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 18:50:04,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:50:04,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:50:04,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 18:50:04,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:50:05,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:05,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 83 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:50:05,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [289279065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:05,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:50:05,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 44] total 46 [2021-05-02 18:50:05,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900564303] [2021-05-02 18:50:05,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:50:05,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:50:05,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:50:05,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1948, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:50:05,462 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 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 18:50:09,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:50:09,296 INFO L93 Difference]: Finished difference Result 170 states and 181 transitions. [2021-05-02 18:50:09,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:50:09,297 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 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 137 [2021-05-02 18:50:09,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:50:09,298 INFO L225 Difference]: With dead ends: 170 [2021-05-02 18:50:09,298 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 18:50:09,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 892 ImplicationChecksByTransitivity, 2597.3ms TimeCoverageRelationStatistics Valid=323, Invalid=7333, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:50:09,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 18:50:09,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 18:50:09,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 states have internal predecessors, (176), 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 18:50:09,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 18:50:09,302 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 137 [2021-05-02 18:50:09,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:50:09,303 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 18:50:09,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 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 18:50:09,303 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 18:50:09,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 18:50:09,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:50:09,304 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:50:09,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:09,509 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:50:09,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:50:09,509 INFO L82 PathProgramCache]: Analyzing trace with hash 566773190, now seen corresponding path program 29 times [2021-05-02 18:50:09,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:50:09,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155523501] [2021-05-02 18:50:09,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:50:09,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:10,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:50:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:10,610 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:50:10,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:50:10,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155523501] [2021-05-02 18:50:10,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155523501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:10,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864792098] [2021-05-02 18:50:10,611 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 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 18:55:09,839 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 18:55:09,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:09,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 18:55:09,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:10,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:10,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 535 proven. 3480 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:55:10,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864792098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:10,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:10,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 51] total 53 [2021-05-02 18:55:10,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292762212] [2021-05-02 18:55:10,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:55:10,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:10,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:55:10,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2610, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:55:10,408 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 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 18:55:15,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:15,296 INFO L93 Difference]: Finished difference Result 191 states and 202 transitions. [2021-05-02 18:55:15,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:55:15,297 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 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 167 [2021-05-02 18:55:15,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:15,298 INFO L225 Difference]: With dead ends: 191 [2021-05-02 18:55:15,298 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 18:55:15,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1198 ImplicationChecksByTransitivity, 3252.1ms TimeCoverageRelationStatistics Valid=385, Invalid=9917, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:55:15,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 18:55:15,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-02 18:55:15,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0648648648648649) internal successors, (197), 185 states have internal predecessors, (197), 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 18:55:15,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 201 transitions. [2021-05-02 18:55:15,302 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 201 transitions. Word has length 167 [2021-05-02 18:55:15,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:15,302 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 201 transitions. [2021-05-02 18:55:15,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 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 18:55:15,303 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 201 transitions. [2021-05-02 18:55:15,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 18:55:15,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:15,304 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 49, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:15,515 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 18:55:15,515 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:15,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:15,515 INFO L82 PathProgramCache]: Analyzing trace with hash -865753416, now seen corresponding path program 30 times [2021-05-02 18:55:15,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:15,516 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758591344] [2021-05-02 18:55:15,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:15,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:16,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:16,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:16,994 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:16,994 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:16,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758591344] [2021-05-02 18:55:16,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758591344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:16,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114230412] [2021-05-02 18:55:16,995 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 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 18:55:19,172 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:55:19,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:19,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:55:19,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:19,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 0 proven. 1566 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2021-05-02 18:55:19,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114230412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:19,998 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:19,998 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 15] total 66 [2021-05-02 18:55:19,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728580755] [2021-05-02 18:55:19,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:55:19,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:19,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:55:20,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=4112, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:55:20,000 INFO L87 Difference]: Start difference. First operand 190 states and 201 transitions. Second operand has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:27,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:27,718 INFO L93 Difference]: Finished difference Result 200 states and 212 transitions. [2021-05-02 18:55:27,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 18:55:27,718 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-02 18:55:27,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:27,719 INFO L225 Difference]: With dead ends: 200 [2021-05-02 18:55:27,719 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 18:55:27,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1966 ImplicationChecksByTransitivity, 5069.5ms TimeCoverageRelationStatistics Valid=630, Invalid=15882, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 18:55:27,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 18:55:27,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 18:55:27,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.068062827225131) internal successors, (204), 191 states have internal predecessors, (204), 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 18:55:27,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 208 transitions. [2021-05-02 18:55:27,725 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 208 transitions. Word has length 188 [2021-05-02 18:55:27,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:27,725 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 208 transitions. [2021-05-02 18:55:27,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 64 states have internal predecessors, (196), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:27,725 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 208 transitions. [2021-05-02 18:55:27,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 18:55:27,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:27,726 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 50, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:27,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:27,932 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:27,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:27,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1980493943, now seen corresponding path program 31 times [2021-05-02 18:55:27,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:27,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027261644] [2021-05-02 18:55:27,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:27,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:29,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:29,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:29,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1621 proven. 3775 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:29,432 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:29,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027261644] [2021-05-02 18:55:29,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027261644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:29,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400506144] [2021-05-02 18:55:29,432 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 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 18:55:29,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:29,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 18:55:29,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:29,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:29,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1621 proven. 3775 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:29,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400506144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:29,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:29,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 18:55:29,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823019824] [2021-05-02 18:55:29,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:55:29,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:29,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:55:29,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:55:29,880 INFO L87 Difference]: Start difference. First operand 196 states and 208 transitions. Second operand has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 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 18:55:35,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:35,302 INFO L93 Difference]: Finished difference Result 200 states and 212 transitions. [2021-05-02 18:55:35,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:55:35,303 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 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 194 [2021-05-02 18:55:35,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:35,303 INFO L225 Difference]: With dead ends: 200 [2021-05-02 18:55:35,304 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 18:55:35,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 196 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3588.2ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:55:35,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 18:55:35,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-02 18:55:35,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0670103092783505) internal successors, (207), 194 states have internal predecessors, (207), 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 18:55:35,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 211 transitions. [2021-05-02 18:55:35,308 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 211 transitions. Word has length 194 [2021-05-02 18:55:35,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:35,309 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 211 transitions. [2021-05-02 18:55:35,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 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 18:55:35,309 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 211 transitions. [2021-05-02 18:55:35,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-02 18:55:35,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:35,310 INFO L523 BasicCegarLoop]: trace histogram [62, 62, 51, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:35,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:55:35,525 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:35,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:35,526 INFO L82 PathProgramCache]: Analyzing trace with hash 746346501, now seen corresponding path program 32 times [2021-05-02 18:55:35,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:35,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322745215] [2021-05-02 18:55:35,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:35,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:37,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:37,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:37,009 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1653 proven. 3927 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:37,009 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:37,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322745215] [2021-05-02 18:55:37,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322745215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:37,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310297565] [2021-05-02 18:55:37,009 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 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 18:55:37,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:55:37,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:37,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 18:55:37,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:37,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:37,411 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1653 proven. 3927 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:37,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310297565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:37,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:37,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:55:37,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858646676] [2021-05-02 18:55:37,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:55:37,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:37,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:55:37,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:55:37,413 INFO L87 Difference]: Start difference. First operand 199 states and 211 transitions. Second operand has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 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 18:55:43,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:43,077 INFO L93 Difference]: Finished difference Result 203 states and 215 transitions. [2021-05-02 18:55:43,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:55:43,077 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 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 197 [2021-05-02 18:55:43,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:43,081 INFO L225 Difference]: With dead ends: 203 [2021-05-02 18:55:43,081 INFO L226 Difference]: Without dead ends: 203 [2021-05-02 18:55:43,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 3665.6ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:55:43,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-02 18:55:43,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2021-05-02 18:55:43,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0659898477157361) internal successors, (210), 197 states have internal predecessors, (210), 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 18:55:43,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 214 transitions. [2021-05-02 18:55:43,086 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 214 transitions. Word has length 197 [2021-05-02 18:55:43,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:43,086 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 214 transitions. [2021-05-02 18:55:43,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 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 18:55:43,086 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 214 transitions. [2021-05-02 18:55:43,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-05-02 18:55:43,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:43,087 INFO L523 BasicCegarLoop]: trace histogram [63, 63, 52, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:43,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:55:43,310 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:43,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:43,310 INFO L82 PathProgramCache]: Analyzing trace with hash -820044361, now seen corresponding path program 33 times [2021-05-02 18:55:43,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:43,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931703932] [2021-05-02 18:55:43,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:43,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:44,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:44,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:44,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 1685 proven. 4082 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:44,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:44,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931703932] [2021-05-02 18:55:44,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931703932] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:44,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680399467] [2021-05-02 18:55:44,894 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 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 18:55:45,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 18:55:45,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:45,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:55:45,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:46,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 0 proven. 1840 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2021-05-02 18:55:46,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680399467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:46,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:46,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 16] total 70 [2021-05-02 18:55:46,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645017551] [2021-05-02 18:55:46,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 18:55:46,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:46,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 18:55:46,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=4641, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:55:46,157 INFO L87 Difference]: Start difference. First operand 202 states and 214 transitions. Second operand has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:55,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:55,029 INFO L93 Difference]: Finished difference Result 212 states and 225 transitions. [2021-05-02 18:55:55,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 18:55:55,029 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 200 [2021-05-02 18:55:55,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:55,030 INFO L225 Difference]: With dead ends: 212 [2021-05-02 18:55:55,030 INFO L226 Difference]: Without dead ends: 209 [2021-05-02 18:55:55,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2225 ImplicationChecksByTransitivity, 5805.6ms TimeCoverageRelationStatistics Valid=669, Invalid=17963, Unknown=0, NotChecked=0, Total=18632 [2021-05-02 18:55:55,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-02 18:55:55,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2021-05-02 18:55:55,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 203 states have internal predecessors, (217), 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 18:55:55,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 221 transitions. [2021-05-02 18:55:55,035 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 221 transitions. Word has length 200 [2021-05-02 18:55:55,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:55,035 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 221 transitions. [2021-05-02 18:55:55,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 68 states have internal predecessors, (208), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:55,035 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 221 transitions. [2021-05-02 18:55:55,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-02 18:55:55,036 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:55,036 INFO L523 BasicCegarLoop]: trace histogram [65, 65, 53, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:55,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:55:55,241 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:55,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:55,241 INFO L82 PathProgramCache]: Analyzing trace with hash 684550680, now seen corresponding path program 34 times [2021-05-02 18:55:55,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:55,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459020809] [2021-05-02 18:55:55,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:55,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:56,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:56,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:56,861 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 1878 proven. 4240 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:55:56,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:56,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459020809] [2021-05-02 18:55:56,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459020809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:56,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016029170] [2021-05-02 18:55:56,861 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 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 18:55:56,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:55:56,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:56,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-02 18:55:56,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:57,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:57,298 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 1878 proven. 4240 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:55:57,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016029170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:57,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:57,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 18:55:57,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883425452] [2021-05-02 18:55:57,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:55:57,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:57,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:55:57,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:55:57,300 INFO L87 Difference]: Start difference. First operand 208 states and 221 transitions. Second operand has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 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 18:56:03,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:03,218 INFO L93 Difference]: Finished difference Result 212 states and 225 transitions. [2021-05-02 18:56:03,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 18:56:03,218 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 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 206 [2021-05-02 18:56:03,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:03,219 INFO L225 Difference]: With dead ends: 212 [2021-05-02 18:56:03,219 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 18:56:03,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1435 ImplicationChecksByTransitivity, 3874.3ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 18:56:03,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 18:56:03,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-05-02 18:56:03,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0679611650485437) internal successors, (220), 206 states have internal predecessors, (220), 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 18:56:03,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 224 transitions. [2021-05-02 18:56:03,223 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 224 transitions. Word has length 206 [2021-05-02 18:56:03,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:03,223 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 224 transitions. [2021-05-02 18:56:03,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 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 18:56:03,224 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 224 transitions. [2021-05-02 18:56:03,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-02 18:56:03,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:03,225 INFO L523 BasicCegarLoop]: trace histogram [66, 66, 54, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:03,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:56:03,441 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:03,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:03,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1148654426, now seen corresponding path program 35 times [2021-05-02 18:56:03,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:03,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185176487] [2021-05-02 18:56:03,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:03,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:05,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:05,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:05,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 1913 proven. 4401 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:56:05,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:05,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185176487] [2021-05-02 18:56:05,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185176487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:05,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18448429] [2021-05-02 18:56:05,066 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 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