/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-acceleration/nested_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:54:52,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:54:52,150 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:54:52,171 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 17:54:52,172 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 17:54:52,174 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 17:54:52,177 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 17:54:52,181 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 17:54:52,183 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 17:54:52,187 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 17:54:52,188 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 17:54:52,190 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 17:54:52,191 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:54:52,192 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:54:52,194 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:54:52,195 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:54:52,196 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:54:52,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:54:52,199 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:54:52,200 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:54:52,201 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:54:52,204 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:54:52,204 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:54:52,206 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:54:52,209 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 17:54:52,209 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 17:54:52,209 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 17:54:52,209 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 17:54:52,210 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 17:54:52,210 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 17:54:52,224 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 17:54:52,225 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 17:54:52,226 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 17:54:52,226 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 17:54:52,227 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 17:54:52,227 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 17:54:52,227 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 17:54:52,227 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 17:54:52,227 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:54:52,228 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:54:52,228 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:54:52,235 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:54:52,247 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:54:52,247 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:54:52,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:54:52,249 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:54:52,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:54:52,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:54:52,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:54:52,249 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:54:52,250 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:54:52,250 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:54:52,250 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:54:52,250 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:54:52,251 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:54:52,251 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:54:52,251 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:54:52,251 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:54:52,251 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:54:52,252 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:54:52,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:54:52,252 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:54:52,252 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:54:52,253 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:54:52,253 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:54:52,463 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:54:52,476 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:54:52,478 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:54:52,478 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:54:52,479 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:54:52,479 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2021-05-02 17:54:52,533 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fef8ef56/4f2cb411a5814a24a577fac9eb89fe48/FLAGa3d76b0b8 [2021-05-02 17:54:52,895 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:54:52,895 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2021-05-02 17:54:52,899 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fef8ef56/4f2cb411a5814a24a577fac9eb89fe48/FLAGa3d76b0b8 [2021-05-02 17:54:53,312 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fef8ef56/4f2cb411a5814a24a577fac9eb89fe48 [2021-05-02 17:54:53,314 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:54:53,318 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:54:53,319 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:54:53,319 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:54:53,322 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:54:53,322 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,323 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@653dc336 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53, skipping insertion in model container [2021-05-02 17:54:53,323 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,327 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:54:53,335 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:54:53,410 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c[322,335] [2021-05-02 17:54:53,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:54:53,425 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:54:53,433 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c[322,335] [2021-05-02 17:54:53,435 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:54:53,446 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:54:53,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53 WrapperNode [2021-05-02 17:54:53,446 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:54:53,447 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:54:53,447 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:54:53,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:54:53,486 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,495 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,508 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,512 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,513 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,519 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:54:53,520 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:54:53,520 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:54:53,520 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:54:53,520 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:54:53,590 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:54:53,590 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:54:53,590 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:54:53,590 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:54:53,590 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:54:53,591 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:54:53,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:54:53,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:54:53,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:54:53,592 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:54:53,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:54:53,811 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:54:53,812 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 17:54:53,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:54:53 BoogieIcfgContainer [2021-05-02 17:54:53,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:54:53,813 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:54:53,813 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:54:53,814 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:54:53,816 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:54:53" (1/1) ... [2021-05-02 17:54:53,846 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (mod v_main_~y~0_5 4294967296) 10) InVars {main_~y~0=v_main_~y~0_5} OutVars{main_~y~0=v_main_~y~0_5} AuxVars[] AssignedVars[] [2021-05-02 17:54:53,874 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.1 percent of original size [2021-05-02 17:54:55,916 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 3 [2021-05-02 17:54:59,047 WARN L205 SmtUtils]: Spent 3.13 s on a formula simplification that was a NOOP. DAG size: 5 [2021-05-02 17:54:59,191 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-02 17:54:59,245 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.1 percent of original size 54 [2021-05-02 17:54:59,280 INFO L1112 elerationTransformer]: Accelerated Formula: (and (= (+ v_main_~y~0_5 1) v_main_~y~0_4) (< (mod v_main_~y~0_5 4294967296) 10)) InVars {main_~y~0=v_main_~y~0_5} OutVars{main_~y~0=v_main_~y~0_4, main_#t~post7=|v_main_#t~post7_1|} AuxVars[] AssignedVars[main_~y~0, main_#t~post7] with Formula: (let ((.cse0 (mod v_main_~y~0_5 4294967296))) (or (and (= |v_main_#t~post7_3| |v_main_#t~post7_1|) (= v_itFin_1 0) (<= 10 .cse0) (= v_main_~y~0_4 v_main_~y~0_5)) (let ((.cse1 (+ v_itFin_1 v_main_~y~0_5))) (and (< 0 v_itFin_1) (= v_main_~y~0_4 .cse1) (< .cse0 10) (<= 10 (mod .cse1 4294967296)) (<= (div (+ (* v_itFin_1 (- 1)) (* v_main_~y~0_5 (- 1)) 10) (- 4294967296)) (+ (div (+ v_main_~y~0_5 (- 4294967295)) 4294967296) 1)))))) InVars {main_~y~0=v_main_~y~0_5, main_#t~post7=|v_main_#t~post7_3|} OutVars{main_~y~0=v_main_~y~0_4, main_#t~post7=|v_main_#t~post7_1|} AuxVars[v_itFin_1] AssignedVars[main_~y~0, main_#t~post7] [2021-05-02 17:54:59,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:54:59 BasicIcfg [2021-05-02 17:54:59,286 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:54:59,287 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:54:59,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:54:59,289 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:54:59,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:54:53" (1/4) ... [2021-05-02 17:54:59,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ee2fe3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:54:59, skipping insertion in model container [2021-05-02 17:54:59,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:54:53" (2/4) ... [2021-05-02 17:54:59,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ee2fe3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:54:59, skipping insertion in model container [2021-05-02 17:54:59,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:54:53" (3/4) ... [2021-05-02 17:54:59,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ee2fe3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:54:59, skipping insertion in model container [2021-05-02 17:54:59,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:54:59" (4/4) ... [2021-05-02 17:54:59,291 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-2.cJordan [2021-05-02 17:54:59,294 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:54:59,297 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:54:59,307 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:54:59,318 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:54:59,318 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:54:59,318 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:54:59,318 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:54:59,318 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:54:59,318 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:54:59,318 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:54:59,318 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:54:59,326 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 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 17:54:59,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:54:59,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:59,333 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:59,333 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:59,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:59,340 INFO L82 PathProgramCache]: Analyzing trace with hash -962721461, now seen corresponding path program 1 times [2021-05-02 17:54:59,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:59,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43873734] [2021-05-02 17:54:59,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:59,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:59,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:59,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:59,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43873734] [2021-05-02 17:54:59,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43873734] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:54:59,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:54:59,512 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:54:59,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167965618] [2021-05-02 17:54:59,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:54:59,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:59,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:54:59,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:54:59,525 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 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 17:54:59,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:59,554 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 17:54:59,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:54:59,556 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:54:59,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:59,560 INFO L225 Difference]: With dead ends: 20 [2021-05-02 17:54:59,561 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 17:54:59,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:54:59,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 17:54:59,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 17:54:59,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 17:54:59,580 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 17:54:59,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:59,581 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 17:54:59,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,581 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 17:54:59,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:54:59,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:59,581 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:59,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:54:59,582 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:59,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:59,582 INFO L82 PathProgramCache]: Analyzing trace with hash -961797940, now seen corresponding path program 1 times [2021-05-02 17:54:59,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:59,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786686786] [2021-05-02 17:54:59,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:59,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:59,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:59,675 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:59,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786686786] [2021-05-02 17:54:59,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786686786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:54:59,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:54:59,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:54:59,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961206900] [2021-05-02 17:54:59,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:54:59,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:59,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:54:59,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:54:59,677 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:59,727 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-05-02 17:54:59,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:54:59,728 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:54:59,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:59,729 INFO L225 Difference]: With dead ends: 17 [2021-05-02 17:54:59,729 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 17:54:59,729 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:54:59,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 17:54:59,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-05-02 17:54:59,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 17:54:59,734 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 17:54:59,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:59,734 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 17:54:59,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,735 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 17:54:59,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:54:59,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:59,736 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:59,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:54:59,738 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:59,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:59,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1952633576, now seen corresponding path program 1 times [2021-05-02 17:54:59,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:59,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129349774] [2021-05-02 17:54:59,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:59,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:59,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,814 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 17:54:59,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:59,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129349774] [2021-05-02 17:54:59,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129349774] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:54:59,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:54:59,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:54:59,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40912832] [2021-05-02 17:54:59,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:54:59,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:59,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:54:59,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:54:59,816 INFO L87 Difference]: Start difference. First operand 15 states and 16 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 17:54:59,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:59,851 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-05-02 17:54:59,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:54:59,851 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 17:54:59,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:59,852 INFO L225 Difference]: With dead ends: 16 [2021-05-02 17:54:59,852 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 17:54:59,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:54:59,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 17:54:59,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 17:54:59,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:59,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 17:54:59,854 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-05-02 17:54:59,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:59,854 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 17:54:59,854 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 17:54:59,854 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 17:54:59,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:54:59,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:59,854 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:59,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 17:54:59,855 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:59,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:59,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1982267804, now seen corresponding path program 1 times [2021-05-02 17:54:59,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:59,855 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118173020] [2021-05-02 17:54:59,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:59,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:59,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:54:59,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:59,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118173020] [2021-05-02 17:54:59,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118173020] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:59,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060113677] [2021-05-02 17:54:59,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:59,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:59,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:54:59,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:00,002 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:55:00,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060113677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:00,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:00,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:55:00,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834390578] [2021-05-02 17:55:00,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:55:00,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:00,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:55:00,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:55:00,009 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:00,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:00,096 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-05-02 17:55:00,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:55:00,097 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:55:00,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:00,097 INFO L225 Difference]: With dead ends: 23 [2021-05-02 17:55:00,097 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 17:55:00,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 77.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:55:00,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 17:55:00,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-02 17:55:00,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:00,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 17:55:00,100 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-05-02 17:55:00,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:00,100 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 17:55:00,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:00,100 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 17:55:00,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:55:00,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:00,101 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:00,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:00,318 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:00,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:00,319 INFO L82 PathProgramCache]: Analyzing trace with hash 162353148, now seen corresponding path program 2 times [2021-05-02 17:55:00,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:00,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587003540] [2021-05-02 17:55:00,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:00,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:00,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:00,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:00,441 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 17:55:00,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:00,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587003540] [2021-05-02 17:55:00,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587003540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:00,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846581789] [2021-05-02 17:55:00,442 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 17:55:00,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:00,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:00,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:55:00,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:00,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:00,564 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 17:55:00,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846581789] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:00,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:00,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:55:00,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308586812] [2021-05-02 17:55:00,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:55:00,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:00,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:55:00,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:55:00,569 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:00,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:00,677 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-02 17:55:00,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:55:00,678 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 17:55:00,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:00,679 INFO L225 Difference]: With dead ends: 27 [2021-05-02 17:55:00,679 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 17:55:00,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 97.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:55:00,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 17:55:00,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 17:55:00,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 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 17:55:00,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:55:00,685 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 19 [2021-05-02 17:55:00,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:00,685 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:55:00,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:00,686 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:55:00,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:55:00,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:00,687 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:00,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:00,898 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:00,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:00,898 INFO L82 PathProgramCache]: Analyzing trace with hash -45148780, now seen corresponding path program 3 times [2021-05-02 17:55:00,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:00,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195226104] [2021-05-02 17:55:00,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:00,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:00,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:00,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:00,991 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:55:00,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:00,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195226104] [2021-05-02 17:55:00,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195226104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:00,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072305969] [2021-05-02 17:55:00,991 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 17:55:01,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 17:55:01,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:01,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:55:01,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:01,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:01,127 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:55:01,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072305969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:01,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:01,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:55:01,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053193731] [2021-05-02 17:55:01,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:55:01,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:01,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:55:01,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:55:01,129 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:01,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:01,306 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2021-05-02 17:55:01,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:55:01,306 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 17:55:01,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:01,307 INFO L225 Difference]: With dead ends: 31 [2021-05-02 17:55:01,307 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:55:01,307 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 139.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:55:01,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:55:01,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 17:55:01,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:01,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-02 17:55:01,309 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2021-05-02 17:55:01,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:01,309 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-02 17:55:01,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:01,309 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-02 17:55:01,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 17:55:01,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:01,310 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:01,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:01,526 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:01,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:01,526 INFO L82 PathProgramCache]: Analyzing trace with hash 417615660, now seen corresponding path program 4 times [2021-05-02 17:55:01,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:01,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746538387] [2021-05-02 17:55:01,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:01,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:01,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:01,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:01,695 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:55:01,695 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:01,695 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746538387] [2021-05-02 17:55:01,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746538387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:01,695 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715523147] [2021-05-02 17:55:01,695 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 17:55:01,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:01,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:01,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 17:55:01,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:01,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:01,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:01,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:01,945 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:55:01,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715523147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:01,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:01,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2021-05-02 17:55:01,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267138765] [2021-05-02 17:55:01,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:55:01,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:01,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:55:01,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:55:01,946 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 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 17:55:02,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:02,265 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-05-02 17:55:02,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:55:02,265 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 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 27 [2021-05-02 17:55:02,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:02,266 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:55:02,266 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 17:55:02,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 272.2ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:55:02,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 17:55:02,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2021-05-02 17:55:02,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:02,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-05-02 17:55:02,268 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 27 [2021-05-02 17:55:02,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:02,268 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-05-02 17:55:02,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 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 17:55:02,268 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-05-02 17:55:02,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 17:55:02,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:02,269 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:02,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:02,470 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:02,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:02,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1919746876, now seen corresponding path program 5 times [2021-05-02 17:55:02,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:02,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988695545] [2021-05-02 17:55:02,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:02,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:02,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:02,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:02,646 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:55:02,646 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:02,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988695545] [2021-05-02 17:55:02,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988695545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:02,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713623675] [2021-05-02 17:55:02,647 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 17:55:02,858 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 17:55:02,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:02,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:55:02,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:02,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:02,928 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:55:02,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713623675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:02,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:02,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:55:02,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384318976] [2021-05-02 17:55:02,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:55:02,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:02,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:55:02,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:55:02,930 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:03,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:03,176 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-05-02 17:55:03,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:55:03,176 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 17:55:03,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:03,177 INFO L225 Difference]: With dead ends: 39 [2021-05-02 17:55:03,177 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:55:03,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 228.4ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:55:03,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:55:03,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2021-05-02 17:55:03,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:03,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-05-02 17:55:03,183 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 31 [2021-05-02 17:55:03,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:03,184 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-05-02 17:55:03,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:03,184 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-05-02 17:55:03,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:55:03,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:03,184 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:03,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:03,397 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:03,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:03,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1988026788, now seen corresponding path program 6 times [2021-05-02 17:55:03,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:03,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263507555] [2021-05-02 17:55:03,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:03,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:03,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:03,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:03,523 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 17:55:03,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:03,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263507555] [2021-05-02 17:55:03,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263507555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:03,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668936721] [2021-05-02 17:55:03,523 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 17:55:03,678 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 17:55:03,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:03,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:55:03,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:03,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:03,756 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 17:55:03,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668936721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:03,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:03,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:55:03,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818719265] [2021-05-02 17:55:03,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:55:03,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:03,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:55:03,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:55:03,758 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:04,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:04,145 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-05-02 17:55:04,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:55:04,145 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 35 [2021-05-02 17:55:04,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:04,146 INFO L225 Difference]: With dead ends: 43 [2021-05-02 17:55:04,146 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 17:55:04,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 225.2ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:55:04,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 17:55:04,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-05-02 17:55:04,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:04,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2021-05-02 17:55:04,149 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 35 [2021-05-02 17:55:04,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:04,149 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2021-05-02 17:55:04,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:04,149 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2021-05-02 17:55:04,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 17:55:04,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:04,150 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:04,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:04,357 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:04,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:04,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1210797068, now seen corresponding path program 7 times [2021-05-02 17:55:04,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:04,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485365337] [2021-05-02 17:55:04,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:04,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:04,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:04,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 17:55:04,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:04,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485365337] [2021-05-02 17:55:04,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485365337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:04,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937172581] [2021-05-02 17:55:04,677 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 17:55:04,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:04,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:55:04,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:04,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:04,988 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 17:55:04,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937172581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:04,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:04,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:55:04,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765971717] [2021-05-02 17:55:04,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:55:04,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:04,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:55:04,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:55:04,990 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:05,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:05,447 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2021-05-02 17:55:05,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:55:05,448 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 17:55:05,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:05,448 INFO L225 Difference]: With dead ends: 47 [2021-05-02 17:55:05,448 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 17:55:05,449 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 402.4ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:55:05,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 17:55:05,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2021-05-02 17:55:05,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:05,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2021-05-02 17:55:05,451 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 39 [2021-05-02 17:55:05,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:05,451 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2021-05-02 17:55:05,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:05,451 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2021-05-02 17:55:05,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:55:05,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:05,452 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:05,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:05,669 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:05,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:05,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1061962356, now seen corresponding path program 8 times [2021-05-02 17:55:05,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:05,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713907042] [2021-05-02 17:55:05,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:05,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:06,023 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2021-05-02 17:55:06,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:06,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 17:55:06,101 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:06,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713907042] [2021-05-02 17:55:06,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713907042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:06,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456907711] [2021-05-02 17:55:06,102 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 17:55:06,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:06,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:06,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:55:06,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:06,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:06,290 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 17:55:06,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456907711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:06,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:06,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:55:06,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616720133] [2021-05-02 17:55:06,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:55:06,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:06,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:55:06,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:55:06,291 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:06,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:06,825 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-05-02 17:55:06,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:55:06,825 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 17:55:06,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:06,826 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:55:06,826 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 17:55:06,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 629.7ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:55:06,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 17:55:06,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2021-05-02 17:55:06,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:06,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2021-05-02 17:55:06,829 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 43 [2021-05-02 17:55:06,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:06,829 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2021-05-02 17:55:06,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:06,829 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2021-05-02 17:55:06,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:55:06,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:06,830 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:07,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 17:55:07,041 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:07,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:07,044 INFO L82 PathProgramCache]: Analyzing trace with hash -918275292, now seen corresponding path program 9 times [2021-05-02 17:55:07,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:07,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302533776] [2021-05-02 17:55:07,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:07,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:07,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:07,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:07,413 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:55:07,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:07,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302533776] [2021-05-02 17:55:07,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302533776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:07,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537252517] [2021-05-02 17:55:07,413 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 17:55:07,848 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-05-02 17:55:07,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:07,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:55:07,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:07,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:07,970 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:55:07,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537252517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:07,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:07,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:55:07,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439685424] [2021-05-02 17:55:07,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:55:07,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:07,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:55:07,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:55:07,971 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:08,412 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2021-05-02 17:55:08,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:55:08,413 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 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 17:55:08,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:08,413 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:55:08,413 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 17:55:08,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 485.2ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:55:08,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 17:55:08,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2021-05-02 17:55:08,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 47 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2021-05-02 17:55:08,416 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 47 [2021-05-02 17:55:08,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:08,416 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2021-05-02 17:55:08,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,417 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2021-05-02 17:55:08,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 17:55:08,417 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:08,417 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:08,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:08,621 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:08,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:08,621 INFO L82 PathProgramCache]: Analyzing trace with hash -206820164, now seen corresponding path program 10 times [2021-05-02 17:55:08,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:08,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198741832] [2021-05-02 17:55:08,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:08,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:08,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:08,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:08,808 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 17:55:08,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:08,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198741832] [2021-05-02 17:55:08,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198741832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:08,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211480086] [2021-05-02 17:55:08,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:55:08,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:08,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:08,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:55:08,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:08,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:08,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:08,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:08,966 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 17:55:08,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211480086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:08,966 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:08,966 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 17:55:08,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757651920] [2021-05-02 17:55:08,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:55:08,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:08,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:55:08,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:55:08,968 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 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 17:55:09,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:09,536 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-05-02 17:55:09,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:55:09,536 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 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 51 [2021-05-02 17:55:09,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:09,537 INFO L225 Difference]: With dead ends: 59 [2021-05-02 17:55:09,537 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 17:55:09,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 380.9ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:55:09,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 17:55:09,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2021-05-02 17:55:09,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:09,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 17:55:09,540 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 51 [2021-05-02 17:55:09,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:09,540 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 17:55:09,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 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 17:55:09,540 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 17:55:09,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 17:55:09,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:09,541 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:09,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:09,742 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:09,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:09,742 INFO L82 PathProgramCache]: Analyzing trace with hash -552496556, now seen corresponding path program 11 times [2021-05-02 17:55:09,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:09,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57057044] [2021-05-02 17:55:09,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:09,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:09,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:09,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:09,945 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 0 proven. 341 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 17:55:09,945 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:09,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57057044] [2021-05-02 17:55:09,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57057044] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:09,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036773308] [2021-05-02 17:55:09,945 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 17:55:11,098 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-05-02 17:55:11,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:11,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 17:55:11,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:11,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:11,306 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 0 proven. 341 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 17:55:11,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036773308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:11,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:11,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:55:11,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064131655] [2021-05-02 17:55:11,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:55:11,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:11,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:55:11,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:55:11,308 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:12,045 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2021-05-02 17:55:12,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:55:12,046 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 17:55:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:12,046 INFO L225 Difference]: With dead ends: 63 [2021-05-02 17:55:12,046 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 17:55:12,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 522.2ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:55:12,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 17:55:12,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2021-05-02 17:55:12,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 55 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-05-02 17:55:12,049 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 55 [2021-05-02 17:55:12,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:12,050 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-05-02 17:55:12,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,050 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-05-02 17:55:12,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 17:55:12,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:12,050 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:12,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 17:55:12,251 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:12,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:12,251 INFO L82 PathProgramCache]: Analyzing trace with hash 664431596, now seen corresponding path program 12 times [2021-05-02 17:55:12,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:12,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295268383] [2021-05-02 17:55:12,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:12,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:12,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:12,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:12,484 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:55:12,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:12,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295268383] [2021-05-02 17:55:12,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295268383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:12,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911138806] [2021-05-02 17:55:12,485 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 17:55:13,461 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2021-05-02 17:55:13,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:13,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:55:13,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:13,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:13,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:13,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:13,611 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:55:13,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911138806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:13,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:13,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 17:55:13,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545894540] [2021-05-02 17:55:13,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:55:13,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:13,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:55:13,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:55:13,612 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 17 states have internal predecessors, (60), 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 17:55:14,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:14,326 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2021-05-02 17:55:14,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:55:14,329 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 17 states have internal predecessors, (60), 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 59 [2021-05-02 17:55:14,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:14,329 INFO L225 Difference]: With dead ends: 67 [2021-05-02 17:55:14,329 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 17:55:14,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 486.9ms TimeCoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:55:14,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 17:55:14,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2021-05-02 17:55:14,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 59 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:14,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2021-05-02 17:55:14,332 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 59 [2021-05-02 17:55:14,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:14,332 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2021-05-02 17:55:14,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 17 states have internal predecessors, (60), 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 17:55:14,332 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2021-05-02 17:55:14,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 17:55:14,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:14,333 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:14,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:55:14,537 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:14,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:14,537 INFO L82 PathProgramCache]: Analyzing trace with hash -429082236, now seen corresponding path program 13 times [2021-05-02 17:55:14,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:14,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722048582] [2021-05-02 17:55:14,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:14,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:14,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:14,933 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:55:14,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:14,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722048582] [2021-05-02 17:55:14,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722048582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:14,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302851726] [2021-05-02 17:55:14,934 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 17:55:14,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:14,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:55:14,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:15,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:15,099 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:55:15,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302851726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:15,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:15,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 17:55:15,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143545538] [2021-05-02 17:55:15,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 17:55:15,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:15,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 17:55:15,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:55:15,100 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:15,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:15,794 INFO L93 Difference]: Finished difference Result 71 states and 86 transitions. [2021-05-02 17:55:15,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:55:15,795 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 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 63 [2021-05-02 17:55:15,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:15,795 INFO L225 Difference]: With dead ends: 71 [2021-05-02 17:55:15,795 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 17:55:15,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 643.1ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:55:15,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 17:55:15,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2021-05-02 17:55:15,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.2380952380952381) internal successors, (78), 63 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:15,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2021-05-02 17:55:15,821 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 63 [2021-05-02 17:55:15,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:15,822 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2021-05-02 17:55:15,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:15,822 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2021-05-02 17:55:15,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 17:55:15,824 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:15,824 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:16,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:16,031 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:16,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:16,031 INFO L82 PathProgramCache]: Analyzing trace with hash 833518364, now seen corresponding path program 14 times [2021-05-02 17:55:16,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:16,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207165257] [2021-05-02 17:55:16,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:16,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:16,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:16,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:16,243 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 560 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 17:55:16,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:16,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207165257] [2021-05-02 17:55:16,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207165257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:16,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720940026] [2021-05-02 17:55:16,243 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 17:55:16,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:16,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:16,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 17:55:16,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:16,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:16,434 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 560 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 17:55:16,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720940026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:16,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:16,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:55:16,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432148623] [2021-05-02 17:55:16,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:55:16,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:16,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:55:16,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:55:16,435 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:17,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:17,243 INFO L93 Difference]: Finished difference Result 75 states and 91 transitions. [2021-05-02 17:55:17,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:55:17,243 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 17:55:17,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:17,244 INFO L225 Difference]: With dead ends: 75 [2021-05-02 17:55:17,244 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 17:55:17,244 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 521.1ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 17:55:17,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 17:55:17,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2021-05-02 17:55:17,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.2388059701492538) internal successors, (83), 67 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:17,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2021-05-02 17:55:17,247 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 67 [2021-05-02 17:55:17,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:17,247 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2021-05-02 17:55:17,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:17,247 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2021-05-02 17:55:17,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 17:55:17,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:17,247 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:17,456 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:17,457 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:17,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:17,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1668960076, now seen corresponding path program 15 times [2021-05-02 17:55:17,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:17,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949048389] [2021-05-02 17:55:17,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:17,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:17,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:17,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:17,697 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 645 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:55:17,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:17,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949048389] [2021-05-02 17:55:17,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949048389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:17,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087112683] [2021-05-02 17:55:17,698 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 17:55:19,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 17:55:19,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:19,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 17:55:19,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:19,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:19,215 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 645 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:55:19,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087112683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:19,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:19,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:55:19,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648396735] [2021-05-02 17:55:19,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:55:19,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:19,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:55:19,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:55:19,217 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 20 states, 20 states have (on average 3.5) internal successors, (70), 19 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 17:55:20,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:20,076 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2021-05-02 17:55:20,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:55:20,077 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.5) internal successors, (70), 19 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 71 [2021-05-02 17:55:20,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:20,077 INFO L225 Difference]: With dead ends: 79 [2021-05-02 17:55:20,077 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 17:55:20,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 596.5ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 17:55:20,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 17:55:20,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-05-02 17:55:20,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 71 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:20,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2021-05-02 17:55:20,080 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 71 [2021-05-02 17:55:20,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:20,080 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2021-05-02 17:55:20,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.5) internal successors, (70), 19 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 17:55:20,080 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2021-05-02 17:55:20,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:55:20,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:20,081 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:20,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 17:55:20,285 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:20,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:20,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1223140788, now seen corresponding path program 16 times [2021-05-02 17:55:20,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:20,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397836005] [2021-05-02 17:55:20,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:20,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:20,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:20,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:20,530 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:55:20,530 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:20,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397836005] [2021-05-02 17:55:20,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397836005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:20,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867550899] [2021-05-02 17:55:20,530 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 17:55:20,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:20,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:20,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 17:55:20,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:20,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:20,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:20,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:20,698 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:55:20,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867550899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:20,698 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:20,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 23 [2021-05-02 17:55:20,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520913118] [2021-05-02 17:55:20,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 17:55:20,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:20,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 17:55:20,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2021-05-02 17:55:20,699 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 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 17:55:21,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:21,939 INFO L93 Difference]: Finished difference Result 83 states and 101 transitions. [2021-05-02 17:55:21,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:55:21,948 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 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 75 [2021-05-02 17:55:21,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:21,949 INFO L225 Difference]: With dead ends: 83 [2021-05-02 17:55:21,949 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 17:55:21,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 722.8ms TimeCoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:55:21,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 17:55:21,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2021-05-02 17:55:21,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.24) internal successors, (93), 75 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:21,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 97 transitions. [2021-05-02 17:55:21,951 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 97 transitions. Word has length 75 [2021-05-02 17:55:21,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:21,952 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 97 transitions. [2021-05-02 17:55:21,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 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 17:55:21,952 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 97 transitions. [2021-05-02 17:55:21,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 17:55:21,952 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:21,952 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:22,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:22,165 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:22,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:22,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1903396892, now seen corresponding path program 17 times [2021-05-02 17:55:22,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:22,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80490665] [2021-05-02 17:55:22,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:22,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:22,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:22,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:22,495 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 17:55:22,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:22,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80490665] [2021-05-02 17:55:22,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80490665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:22,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560117735] [2021-05-02 17:55:22,496 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 17:55:26,069 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 17:55:26,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:26,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 17:55:26,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:26,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:26,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:26,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:26,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:26,486 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 0 proven. 835 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:55:26,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560117735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:26,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:26,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 23] total 25 [2021-05-02 17:55:26,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857852727] [2021-05-02 17:55:26,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 17:55:26,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:26,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 17:55:26,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:55:26,488 INFO L87 Difference]: Start difference. First operand 80 states and 97 transitions. Second operand has 25 states, 25 states have (on average 3.32) internal successors, (83), 24 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:27,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:27,734 INFO L93 Difference]: Finished difference Result 87 states and 106 transitions. [2021-05-02 17:55:27,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:55:27,735 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.32) internal successors, (83), 24 states have internal predecessors, (83), 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 79 [2021-05-02 17:55:27,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:27,736 INFO L225 Difference]: With dead ends: 87 [2021-05-02 17:55:27,736 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 17:55:27,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 65 SyntacticMatches, 13 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 969.8ms TimeCoverageRelationStatistics Valid=182, Invalid=1888, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:55:27,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 17:55:27,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2021-05-02 17:55:27,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.240506329113924) internal successors, (98), 79 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:27,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2021-05-02 17:55:27,739 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 79 [2021-05-02 17:55:27,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:27,739 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2021-05-02 17:55:27,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.32) internal successors, (83), 24 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:27,739 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2021-05-02 17:55:27,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 17:55:27,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:27,739 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:27,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 17:55:27,963 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:27,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:27,963 INFO L82 PathProgramCache]: Analyzing trace with hash 755501436, now seen corresponding path program 18 times [2021-05-02 17:55:27,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:27,963 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796978173] [2021-05-02 17:55:27,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:28,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:28,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:28,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:28,292 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 0 proven. 936 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 17:55:28,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:28,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796978173] [2021-05-02 17:55:28,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796978173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:28,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815048559] [2021-05-02 17:55:28,293 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 17:55:31,307 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2021-05-02 17:55:31,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:31,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 17:55:31,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:31,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:31,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:31,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:31,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:31,580 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 0 proven. 937 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 17:55:31,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815048559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:31,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:31,580 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 25] total 27 [2021-05-02 17:55:31,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692826843] [2021-05-02 17:55:31,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 17:55:31,580 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:31,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 17:55:31,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 17:55:31,581 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 27 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 25 states have internal predecessors, (87), 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 17:55:32,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:32,936 INFO L93 Difference]: Finished difference Result 91 states and 111 transitions. [2021-05-02 17:55:32,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:55:32,937 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 25 states have internal predecessors, (87), 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 17:55:32,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:32,937 INFO L225 Difference]: With dead ends: 91 [2021-05-02 17:55:32,937 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 17:55:32,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 844.5ms TimeCoverageRelationStatistics Valid=183, Invalid=2073, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:55:32,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 17:55:32,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2021-05-02 17:55:32,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.2409638554216869) internal successors, (103), 83 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:32,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 107 transitions. [2021-05-02 17:55:32,940 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 107 transitions. Word has length 83 [2021-05-02 17:55:32,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:32,940 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 107 transitions. [2021-05-02 17:55:32,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 25 states have internal predecessors, (87), 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 17:55:32,940 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 107 transitions. [2021-05-02 17:55:32,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 17:55:32,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:32,940 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:33,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 17:55:33,144 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:33,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:33,145 INFO L82 PathProgramCache]: Analyzing trace with hash 431034132, now seen corresponding path program 19 times [2021-05-02 17:55:33,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:33,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224418461] [2021-05-02 17:55:33,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:33,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:33,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 0 proven. 1045 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 17:55:33,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:33,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224418461] [2021-05-02 17:55:33,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224418461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:33,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078111606] [2021-05-02 17:55:33,514 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 17:55:33,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:33,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 17:55:33,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:33,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:33,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 0 proven. 1045 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 17:55:33,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078111606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:33,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:33,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 17:55:33,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218385564] [2021-05-02 17:55:33,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 17:55:33,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:33,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 17:55:33,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:55:33,748 INFO L87 Difference]: Start difference. First operand 88 states and 107 transitions. Second operand has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:35,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:35,048 INFO L93 Difference]: Finished difference Result 95 states and 116 transitions. [2021-05-02 17:55:35,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 17:55:35,049 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-05-02 17:55:35,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:35,049 INFO L225 Difference]: With dead ends: 95 [2021-05-02 17:55:35,049 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 17:55:35,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 828.2ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 17:55:35,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 17:55:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2021-05-02 17:55:35,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 87 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:35,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 112 transitions. [2021-05-02 17:55:35,051 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 112 transitions. Word has length 87 [2021-05-02 17:55:35,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:35,052 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 112 transitions. [2021-05-02 17:55:35,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:35,052 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 112 transitions. [2021-05-02 17:55:35,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 17:55:35,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:35,052 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:35,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 17:55:35,265 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:35,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:35,265 INFO L82 PathProgramCache]: Analyzing trace with hash -659715924, now seen corresponding path program 20 times [2021-05-02 17:55:35,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:35,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458698149] [2021-05-02 17:55:35,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:35,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:35,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:35,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:35,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 0 proven. 1160 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 17:55:35,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:35,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458698149] [2021-05-02 17:55:35,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458698149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:35,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160135265] [2021-05-02 17:55:35,619 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 17:55:35,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:35,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:35,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 17:55:35,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:35,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:35,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 0 proven. 1160 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 17:55:35,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160135265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:35,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:35,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 17:55:35,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620140620] [2021-05-02 17:55:35,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 17:55:35,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:35,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 17:55:35,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:55:35,901 INFO L87 Difference]: Start difference. First operand 92 states and 112 transitions. Second operand has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:37,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:37,307 INFO L93 Difference]: Finished difference Result 99 states and 121 transitions. [2021-05-02 17:55:37,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:55:37,308 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 17:55:37,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:37,308 INFO L225 Difference]: With dead ends: 99 [2021-05-02 17:55:37,308 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 17:55:37,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 859.1ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:55:37,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 17:55:37,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2021-05-02 17:55:37,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.2417582417582418) internal successors, (113), 91 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 17:55:37,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 117 transitions. [2021-05-02 17:55:37,311 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 117 transitions. Word has length 91 [2021-05-02 17:55:37,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:37,311 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 117 transitions. [2021-05-02 17:55:37,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:37,311 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 117 transitions. [2021-05-02 17:55:37,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 17:55:37,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:37,311 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:37,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 17:55:37,524 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:37,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:37,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1797486148, now seen corresponding path program 21 times [2021-05-02 17:55:37,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:37,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259690247] [2021-05-02 17:55:37,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:37,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:37,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:37,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:37,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 17:55:37,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:37,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259690247] [2021-05-02 17:55:37,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259690247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:37,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702031797] [2021-05-02 17:55:37,894 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 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 17:55:39,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-05-02 17:55:39,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:39,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 17:55:39,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:40,350 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 17:55:40,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702031797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:40,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:40,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 17:55:40,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582652478] [2021-05-02 17:55:40,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 17:55:40,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:40,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 17:55:40,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 17:55:40,351 INFO L87 Difference]: Start difference. First operand 96 states and 117 transitions. Second operand has 26 states, 26 states have (on average 3.6153846153846154) internal successors, (94), 25 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 17:55:41,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:41,750 INFO L93 Difference]: Finished difference Result 103 states and 126 transitions. [2021-05-02 17:55:41,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 17:55:41,750 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.6153846153846154) internal successors, (94), 25 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 95 [2021-05-02 17:55:41,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:41,750 INFO L225 Difference]: With dead ends: 103 [2021-05-02 17:55:41,751 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 17:55:41,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 86 SyntacticMatches, 11 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 1031.2ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:55:41,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 17:55:41,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2021-05-02 17:55:41,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.2421052631578948) internal successors, (118), 95 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:41,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2021-05-02 17:55:41,754 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 95 [2021-05-02 17:55:41,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:41,755 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2021-05-02 17:55:41,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.6153846153846154) internal successors, (94), 25 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 17:55:41,755 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2021-05-02 17:55:41,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 17:55:41,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:41,755 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:41,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 17:55:41,961 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:41,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:41,962 INFO L82 PathProgramCache]: Analyzing trace with hash -818358308, now seen corresponding path program 22 times [2021-05-02 17:55:41,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:41,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536574165] [2021-05-02 17:55:41,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:41,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:42,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:42,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:42,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 0 proven. 1408 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 17:55:42,499 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:42,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536574165] [2021-05-02 17:55:42,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536574165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:42,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746064247] [2021-05-02 17:55:42,499 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 17:55:42,537 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:42,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:42,538 WARN L261 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 17:55:42,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:42,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:42,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:42,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:42,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 0 proven. 1408 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 17:55:42,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746064247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:42,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:42,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27] total 29 [2021-05-02 17:55:42,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548278520] [2021-05-02 17:55:42,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 17:55:42,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:42,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 17:55:42,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2021-05-02 17:55:42,754 INFO L87 Difference]: Start difference. First operand 100 states and 122 transitions. Second operand has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 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 17:55:44,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:44,456 INFO L93 Difference]: Finished difference Result 107 states and 131 transitions. [2021-05-02 17:55:44,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 17:55:44,457 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 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 99 [2021-05-02 17:55:44,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:44,457 INFO L225 Difference]: With dead ends: 107 [2021-05-02 17:55:44,457 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 17:55:44,458 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1100.5ms TimeCoverageRelationStatistics Valid=193, Invalid=2459, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 17:55:44,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 17:55:44,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 104. [2021-05-02 17:55:44,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.2424242424242424) internal successors, (123), 99 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 17:55:44,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 127 transitions. [2021-05-02 17:55:44,459 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 127 transitions. Word has length 99 [2021-05-02 17:55:44,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:44,460 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 127 transitions. [2021-05-02 17:55:44,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 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 17:55:44,460 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 127 transitions. [2021-05-02 17:55:44,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 17:55:44,460 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:44,460 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:44,675 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:44,675 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:44,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:44,676 INFO L82 PathProgramCache]: Analyzing trace with hash -2146194060, now seen corresponding path program 23 times [2021-05-02 17:55:44,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:44,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542439219] [2021-05-02 17:55:44,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:45,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:45,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:45,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 0 proven. 1541 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 17:55:45,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:45,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542439219] [2021-05-02 17:55:45,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542439219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:45,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101146326] [2021-05-02 17:55:45,105 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:55:52,831 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2021-05-02 17:55:52,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:52,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 17:55:52,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:53,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:53,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 0 proven. 1541 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 17:55:53,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101146326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:53,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:53,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 17:55:53,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003655664] [2021-05-02 17:55:53,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 17:55:53,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:53,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 17:55:53,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:55:53,211 INFO L87 Difference]: Start difference. First operand 104 states and 127 transitions. Second operand has 28 states, 28 states have (on average 3.642857142857143) internal successors, (102), 27 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:54,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:54,973 INFO L93 Difference]: Finished difference Result 111 states and 136 transitions. [2021-05-02 17:55:54,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 17:55:54,974 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.642857142857143) internal successors, (102), 27 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-02 17:55:54,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:54,974 INFO L225 Difference]: With dead ends: 111 [2021-05-02 17:55:54,974 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 17:55:54,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 85 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 1239.3ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 17:55:54,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 17:55:54,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 108. [2021-05-02 17:55:54,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.2427184466019416) internal successors, (128), 103 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:54,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 132 transitions. [2021-05-02 17:55:54,977 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 132 transitions. Word has length 103 [2021-05-02 17:55:54,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:54,977 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 132 transitions. [2021-05-02 17:55:54,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.642857142857143) internal successors, (102), 27 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:54,977 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 132 transitions. [2021-05-02 17:55:54,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 17:55:54,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:54,977 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:55,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 17:55:55,183 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:55,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:55,183 INFO L82 PathProgramCache]: Analyzing trace with hash -170264820, now seen corresponding path program 24 times [2021-05-02 17:55:55,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:55,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816965957] [2021-05-02 17:55:55,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:55,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:55,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:55,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:55,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 0 proven. 1680 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 17:55:55,591 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:55,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816965957] [2021-05-02 17:55:55,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816965957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:55,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256036781] [2021-05-02 17:55:55,591 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 17:56:02,192 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 34 check-sat command(s) [2021-05-02 17:56:02,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:02,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 17:56:02,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:02,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 0 proven. 1680 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 17:56:02,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256036781] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:02,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:02,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 17:56:02,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866593511] [2021-05-02 17:56:02,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 17:56:02,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:02,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 17:56:02,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 17:56:02,565 INFO L87 Difference]: Start difference. First operand 108 states and 132 transitions. Second operand has 29 states, 29 states have (on average 3.6551724137931036) internal successors, (106), 28 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 17:56:04,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:04,300 INFO L93 Difference]: Finished difference Result 115 states and 141 transitions. [2021-05-02 17:56:04,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:56:04,300 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.6551724137931036) internal successors, (106), 28 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 107 [2021-05-02 17:56:04,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:04,301 INFO L225 Difference]: With dead ends: 115 [2021-05-02 17:56:04,301 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 17:56:04,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 91 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1192.6ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 17:56:04,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 17:56:04,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 112. [2021-05-02 17:56:04,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.2429906542056075) internal successors, (133), 107 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 17:56:04,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 137 transitions. [2021-05-02 17:56:04,303 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 137 transitions. Word has length 107 [2021-05-02 17:56:04,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:04,303 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 137 transitions. [2021-05-02 17:56:04,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.6551724137931036) internal successors, (106), 28 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 17:56:04,303 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 137 transitions. [2021-05-02 17:56:04,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 17:56:04,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:04,304 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:04,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:56:04,509 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:04,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:04,510 INFO L82 PathProgramCache]: Analyzing trace with hash 632403108, now seen corresponding path program 25 times [2021-05-02 17:56:04,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:04,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523529203] [2021-05-02 17:56:04,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:04,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:04,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:04,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 0 proven. 1825 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:56:04,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:04,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523529203] [2021-05-02 17:56:04,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523529203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:04,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363968455] [2021-05-02 17:56:04,938 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 17:56:05,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:05,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:56:05,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:05,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:05,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 0 proven. 1825 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:56:05,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363968455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:05,227 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:05,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 17:56:05,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231337782] [2021-05-02 17:56:05,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 17:56:05,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:05,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 17:56:05,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 17:56:05,228 INFO L87 Difference]: Start difference. First operand 112 states and 137 transitions. Second operand has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:07,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:07,118 INFO L93 Difference]: Finished difference Result 119 states and 146 transitions. [2021-05-02 17:56:07,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 17:56:07,119 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 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 111 [2021-05-02 17:56:07,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:07,119 INFO L225 Difference]: With dead ends: 119 [2021-05-02 17:56:07,119 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 17:56:07,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1083.0ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 17:56:07,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 17:56:07,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 116. [2021-05-02 17:56:07,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.2432432432432432) internal successors, (138), 111 states have internal predecessors, (138), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:07,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 142 transitions. [2021-05-02 17:56:07,122 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 142 transitions. Word has length 111 [2021-05-02 17:56:07,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:07,122 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 142 transitions. [2021-05-02 17:56:07,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:07,122 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 142 transitions. [2021-05-02 17:56:07,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 17:56:07,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:07,123 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:07,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 17:56:07,330 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:07,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:07,331 INFO L82 PathProgramCache]: Analyzing trace with hash 29419068, now seen corresponding path program 26 times [2021-05-02 17:56:07,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:07,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943127863] [2021-05-02 17:56:07,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:07,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:07,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:07,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 1976 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 17:56:07,830 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:07,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943127863] [2021-05-02 17:56:07,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943127863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:07,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783544494] [2021-05-02 17:56:07,830 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 17:56:07,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:56:07,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:07,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 17:56:07,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:08,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:08,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 1976 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 17:56:08,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783544494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:08,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:08,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 17:56:08,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454313374] [2021-05-02 17:56:08,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 17:56:08,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:08,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 17:56:08,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 17:56:08,099 INFO L87 Difference]: Start difference. First operand 116 states and 142 transitions. Second operand has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:10,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:10,202 INFO L93 Difference]: Finished difference Result 123 states and 151 transitions. [2021-05-02 17:56:10,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 17:56:10,202 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-02 17:56:10,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:10,203 INFO L225 Difference]: With dead ends: 123 [2021-05-02 17:56:10,203 INFO L226 Difference]: Without dead ends: 123 [2021-05-02 17:56:10,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1190.0ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 17:56:10,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-02 17:56:10,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2021-05-02 17:56:10,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.2434782608695651) internal successors, (143), 115 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:10,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 147 transitions. [2021-05-02 17:56:10,205 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 147 transitions. Word has length 115 [2021-05-02 17:56:10,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:10,205 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 147 transitions. [2021-05-02 17:56:10,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:10,206 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 147 transitions. [2021-05-02 17:56:10,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 17:56:10,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:10,206 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:10,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 17:56:10,413 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:10,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:10,413 INFO L82 PathProgramCache]: Analyzing trace with hash -114455596, now seen corresponding path program 27 times [2021-05-02 17:56:10,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:10,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185142726] [2021-05-02 17:56:10,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:10,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:10,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:10,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:10,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 0 proven. 2133 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 17:56:10,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:10,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185142726] [2021-05-02 17:56:10,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185142726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:10,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393062606] [2021-05-02 17:56:10,890 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 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 17:56:17,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-05-02 17:56:17,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:17,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 17:56:17,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:18,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:18,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 0 proven. 2133 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 17:56:18,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393062606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:18,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:18,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 17:56:18,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69528378] [2021-05-02 17:56:18,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 17:56:18,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:18,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 17:56:18,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:56:18,231 INFO L87 Difference]: Start difference. First operand 120 states and 147 transitions. Second operand has 32 states, 32 states have (on average 3.6875) internal successors, (118), 31 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:20,476 INFO L93 Difference]: Finished difference Result 127 states and 156 transitions. [2021-05-02 17:56:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 17:56:20,476 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.6875) internal successors, (118), 31 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 17:56:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:20,477 INFO L225 Difference]: With dead ends: 127 [2021-05-02 17:56:20,477 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 17:56:20,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 108 SyntacticMatches, 13 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 1402.8ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 17:56:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 17:56:20,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 124. [2021-05-02 17:56:20,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.2436974789915967) internal successors, (148), 119 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:20,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 152 transitions. [2021-05-02 17:56:20,480 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 152 transitions. Word has length 119 [2021-05-02 17:56:20,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:20,480 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 152 transitions. [2021-05-02 17:56:20,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.6875) internal successors, (118), 31 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:20,480 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 152 transitions. [2021-05-02 17:56:20,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 17:56:20,480 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:20,480 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:20,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 17:56:20,685 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:20,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:20,686 INFO L82 PathProgramCache]: Analyzing trace with hash 2015208812, now seen corresponding path program 28 times [2021-05-02 17:56:20,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:20,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907837923] [2021-05-02 17:56:20,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:21,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:21,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:21,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 0 proven. 2296 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 17:56:21,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:21,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907837923] [2021-05-02 17:56:21,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907837923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:21,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846115975] [2021-05-02 17:56:21,183 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 17:56:21,216 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:56:21,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:21,218 WARN L261 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 17:56:21,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:21,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:21,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:21,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:21,445 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 0 proven. 2296 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 17:56:21,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846115975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:21,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:21,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 35 [2021-05-02 17:56:21,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717629745] [2021-05-02 17:56:21,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 17:56:21,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:21,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 17:56:21,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1094, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:56:21,447 INFO L87 Difference]: Start difference. First operand 124 states and 152 transitions. Second operand has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 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 17:56:23,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:23,852 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-05-02 17:56:23,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 17:56:23,853 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 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 123 [2021-05-02 17:56:23,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:23,854 INFO L225 Difference]: With dead ends: 131 [2021-05-02 17:56:23,854 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 17:56:23,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 122 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1307.4ms TimeCoverageRelationStatistics Valid=241, Invalid=3791, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 17:56:23,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 17:56:23,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 128. [2021-05-02 17:56:23,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.2439024390243902) internal successors, (153), 123 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:23,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 157 transitions. [2021-05-02 17:56:23,856 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 157 transitions. Word has length 123 [2021-05-02 17:56:23,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:23,857 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 157 transitions. [2021-05-02 17:56:23,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 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 17:56:23,857 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 157 transitions. [2021-05-02 17:56:23,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-02 17:56:23,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:23,857 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:24,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 17:56:24,067 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:24,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:24,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1740059396, now seen corresponding path program 29 times [2021-05-02 17:56:24,067 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:24,067 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016443187] [2021-05-02 17:56:24,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:24,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:24,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:24,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:24,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 0 proven. 2465 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 17:56:24,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:24,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016443187] [2021-05-02 17:56:24,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016443187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:24,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400463215] [2021-05-02 17:56:24,818 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 17:57:02,968 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 40 check-sat command(s) [2021-05-02 17:57:02,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:02,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 118 conjunts are in the unsatisfiable core [2021-05-02 17:57:02,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:03,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:03,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:03,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:03,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:03,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:03,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:04,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:04,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:04,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 0 proven. 2472 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 17:57:04,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400463215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:04,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:04,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 46] total 48 [2021-05-02 17:57:04,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488817836] [2021-05-02 17:57:04,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 17:57:04,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:04,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 17:57:04,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2105, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:57:04,349 INFO L87 Difference]: Start difference. First operand 128 states and 157 transitions. Second operand has 48 states, 48 states have (on average 3.0625) internal successors, (147), 47 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:08,130 INFO L93 Difference]: Finished difference Result 135 states and 166 transitions. [2021-05-02 17:57:08,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 17:57:08,131 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0625) internal successors, (147), 47 states have internal predecessors, (147), 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 127 [2021-05-02 17:57:08,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:08,131 INFO L225 Difference]: With dead ends: 135 [2021-05-02 17:57:08,131 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 17:57:08,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 94 SyntacticMatches, 21 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1684 ImplicationChecksByTransitivity, 2865.4ms TimeCoverageRelationStatistics Valid=378, Invalid=7454, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 17:57:08,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 17:57:08,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 132. [2021-05-02 17:57:08,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.2440944881889764) internal successors, (158), 127 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 162 transitions. [2021-05-02 17:57:08,135 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 162 transitions. Word has length 127 [2021-05-02 17:57:08,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:08,135 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 162 transitions. [2021-05-02 17:57:08,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.0625) internal successors, (147), 47 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,135 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 162 transitions. [2021-05-02 17:57:08,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 17:57:08,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:08,136 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:08,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 17:57:08,341 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:08,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:08,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1373621092, now seen corresponding path program 30 times [2021-05-02 17:57:08,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:08,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169956702] [2021-05-02 17:57:08,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:08,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:08,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:08,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 0 proven. 2640 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 17:57:08,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:08,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169956702] [2021-05-02 17:57:08,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169956702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:08,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623370297] [2021-05-02 17:57:08,930 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 17:57:36,036 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 42 check-sat command(s) [2021-05-02 17:57:36,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:36,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 17:57:36,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:36,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-05-02 17:57:36,114 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-05-02 17:57:36,127 INFO L628 ElimStorePlain]: treesize reduction 18, result has 47.1 percent of original size [2021-05-02 17:57:36,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,129 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-02 17:57:36,129 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:22, output treesize:7 [2021-05-02 17:57:36,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:36,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 0 proven. 2642 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 17:57:36,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623370297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:36,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:36,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 40] total 42 [2021-05-02 17:57:36,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875626018] [2021-05-02 17:57:36,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 17:57:36,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:36,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 17:57:36,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 17:57:36,651 INFO L87 Difference]: Start difference. First operand 132 states and 162 transitions. Second operand has 42 states, 42 states have (on average 3.3095238095238093) internal successors, (139), 40 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:57:40,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:40,168 INFO L93 Difference]: Finished difference Result 139 states and 171 transitions. [2021-05-02 17:57:40,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 17:57:40,168 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.3095238095238093) internal successors, (139), 40 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 131 [2021-05-02 17:57:40,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:40,169 INFO L225 Difference]: With dead ends: 139 [2021-05-02 17:57:40,169 INFO L226 Difference]: Without dead ends: 139 [2021-05-02 17:57:40,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 2124.2ms TimeCoverageRelationStatistics Valid=368, Invalid=5484, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 17:57:40,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-02 17:57:40,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 136. [2021-05-02 17:57:40,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.2442748091603053) internal successors, (163), 131 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:40,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 167 transitions. [2021-05-02 17:57:40,172 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 167 transitions. Word has length 131 [2021-05-02 17:57:40,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:40,172 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 167 transitions. [2021-05-02 17:57:40,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.3095238095238093) internal successors, (139), 40 states have internal predecessors, (139), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:57:40,172 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 167 transitions. [2021-05-02 17:57:40,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 17:57:40,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:40,172 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:40,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:40,379 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:40,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:40,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1367430604, now seen corresponding path program 31 times [2021-05-02 17:57:40,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:40,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097487997] [2021-05-02 17:57:40,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:40,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:40,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:40,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:40,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 0 proven. 2821 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 17:57:40,994 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:40,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097487997] [2021-05-02 17:57:40,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097487997] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:40,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16764518] [2021-05-02 17:57:40,995 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 17:57:41,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:41,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 17:57:41,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:41,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:41,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 0 proven. 2821 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 17:57:41,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16764518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:41,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:41,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 17:57:41,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711032359] [2021-05-02 17:57:41,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 17:57:41,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:41,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 17:57:41,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 17:57:41,381 INFO L87 Difference]: Start difference. First operand 136 states and 167 transitions. Second operand has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:44,202 INFO L93 Difference]: Finished difference Result 143 states and 176 transitions. [2021-05-02 17:57:44,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 17:57:44,203 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 135 [2021-05-02 17:57:44,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:44,203 INFO L225 Difference]: With dead ends: 143 [2021-05-02 17:57:44,203 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 17:57:44,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1499.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 17:57:44,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 17:57:44,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2021-05-02 17:57:44,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.2444444444444445) internal successors, (168), 135 states have internal predecessors, (168), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 172 transitions. [2021-05-02 17:57:44,206 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 172 transitions. Word has length 135 [2021-05-02 17:57:44,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:44,206 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 172 transitions. [2021-05-02 17:57:44,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,206 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 172 transitions. [2021-05-02 17:57:44,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 17:57:44,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:44,207 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:44,411 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:44,412 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:44,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:44,412 INFO L82 PathProgramCache]: Analyzing trace with hash -923233332, now seen corresponding path program 32 times [2021-05-02 17:57:44,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:44,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638949889] [2021-05-02 17:57:44,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:44,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:45,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:45,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:45,037 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 0 proven. 3008 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 17:57:45,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:45,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638949889] [2021-05-02 17:57:45,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638949889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:45,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895588413] [2021-05-02 17:57:45,037 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 17:57:45,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:57:45,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:45,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 17:57:45,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:45,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:45,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 0 proven. 3008 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 17:57:45,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895588413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:45,381 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:45,381 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 17:57:45,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582302903] [2021-05-02 17:57:45,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 17:57:45,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:45,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 17:57:45,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 17:57:45,382 INFO L87 Difference]: Start difference. First operand 140 states and 172 transitions. Second operand has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:48,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:48,439 INFO L93 Difference]: Finished difference Result 147 states and 181 transitions. [2021-05-02 17:57:48,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 17:57:48,440 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-02 17:57:48,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:48,441 INFO L225 Difference]: With dead ends: 147 [2021-05-02 17:57:48,441 INFO L226 Difference]: Without dead ends: 147 [2021-05-02 17:57:48,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1573.4ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 17:57:48,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-02 17:57:48,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2021-05-02 17:57:48,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.2446043165467626) internal successors, (173), 139 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:48,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 177 transitions. [2021-05-02 17:57:48,443 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 177 transitions. Word has length 139 [2021-05-02 17:57:48,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:48,443 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 177 transitions. [2021-05-02 17:57:48,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:48,443 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 177 transitions. [2021-05-02 17:57:48,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 17:57:48,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:48,444 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:48,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 17:57:48,645 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:48,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:48,645 INFO L82 PathProgramCache]: Analyzing trace with hash -625741468, now seen corresponding path program 33 times [2021-05-02 17:57:48,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:48,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040440258] [2021-05-02 17:57:48,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:48,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:49,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:49,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:49,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3234 backedges. 0 proven. 3201 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 17:57:49,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:49,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040440258] [2021-05-02 17:57:49,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040440258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:49,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176032865] [2021-05-02 17:57:49,330 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 17:58:05,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2021-05-02 17:58:05,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:58:05,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 17:58:05,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:58:05,766 INFO L134 CoverageAnalysis]: Checked inductivity of 3234 backedges. 0 proven. 3201 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 17:58:05,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176032865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:05,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:58:05,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 17:58:05,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390601531] [2021-05-02 17:58:05,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 17:58:05,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:58:05,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 17:58:05,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 17:58:05,767 INFO L87 Difference]: Start difference. First operand 144 states and 177 transitions. Second operand has 38 states, 38 states have (on average 3.736842105263158) internal successors, (142), 37 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:09,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:58:09,043 INFO L93 Difference]: Finished difference Result 151 states and 186 transitions. [2021-05-02 17:58:09,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 17:58:09,043 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.736842105263158) internal successors, (142), 37 states have internal predecessors, (142), 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 143 [2021-05-02 17:58:09,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:58:09,044 INFO L225 Difference]: With dead ends: 151 [2021-05-02 17:58:09,044 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 17:58:09,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 140 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 1764.6ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 17:58:09,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 17:58:09,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 148. [2021-05-02 17:58:09,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.2447552447552448) internal successors, (178), 143 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:09,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 182 transitions. [2021-05-02 17:58:09,047 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 182 transitions. Word has length 143 [2021-05-02 17:58:09,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:58:09,047 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 182 transitions. [2021-05-02 17:58:09,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.736842105263158) internal successors, (142), 37 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:09,047 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 182 transitions. [2021-05-02 17:58:09,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 17:58:09,047 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:58:09,048 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:58:09,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:58:09,264 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:58:09,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:58:09,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1109998852, now seen corresponding path program 34 times [2021-05-02 17:58:09,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:58:09,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36936696] [2021-05-02 17:58:09,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:58:09,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:10,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:58:10,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:10,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 0 proven. 3400 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-05-02 17:58:10,022 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:58:10,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36936696] [2021-05-02 17:58:10,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36936696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:10,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007578277] [2021-05-02 17:58:10,022 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 17:58:10,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:58:10,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:58:10,081 WARN L261 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 17:58:10,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:58:10,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:10,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:10,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:10,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 0 proven. 3400 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-05-02 17:58:10,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007578277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:10,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:58:10,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39] total 41 [2021-05-02 17:58:10,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201709964] [2021-05-02 17:58:10,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 17:58:10,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:58:10,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 17:58:10,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1526, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 17:58:10,374 INFO L87 Difference]: Start difference. First operand 148 states and 182 transitions. Second operand has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 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 17:58:14,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:58:14,163 INFO L93 Difference]: Finished difference Result 155 states and 191 transitions. [2021-05-02 17:58:14,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 17:58:14,163 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 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 147 [2021-05-02 17:58:14,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:58:14,164 INFO L225 Difference]: With dead ends: 155 [2021-05-02 17:58:14,164 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 17:58:14,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 146 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 1952.9ms TimeCoverageRelationStatistics Valid=289, Invalid=5411, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 17:58:14,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 17:58:14,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 152. [2021-05-02 17:58:14,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.2448979591836735) internal successors, (183), 147 states have internal predecessors, (183), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:14,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 187 transitions. [2021-05-02 17:58:14,167 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 187 transitions. Word has length 147 [2021-05-02 17:58:14,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:58:14,167 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 187 transitions. [2021-05-02 17:58:14,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 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 17:58:14,167 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 187 transitions. [2021-05-02 17:58:14,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-02 17:58:14,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:58:14,167 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:58:14,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 17:58:14,382 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:58:14,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:58:14,382 INFO L82 PathProgramCache]: Analyzing trace with hash -913897324, now seen corresponding path program 35 times [2021-05-02 17:58:14,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:58:14,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355629685] [2021-05-02 17:58:14,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:58:14,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:15,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:58:15,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:15,256 INFO L134 CoverageAnalysis]: Checked inductivity of 3640 backedges. 0 proven. 3605 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 17:58:15,256 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:58:15,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355629685] [2021-05-02 17:58:15,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355629685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:15,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802329017] [2021-05-02 17:58:15,256 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 [2021-05-02 17:59:27,842 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-02 17:59:27,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:59:27,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 17:59:27,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:59:28,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:59:28,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3640 backedges. 0 proven. 3605 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 17:59:28,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802329017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:28,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:59:28,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 17:59:28,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172038086] [2021-05-02 17:59:28,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 17:59:28,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:59:28,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 17:59:28,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:59:28,604 INFO L87 Difference]: Start difference. First operand 152 states and 187 transitions. Second operand has 40 states, 40 states have (on average 3.75) internal successors, (150), 39 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:32,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:59:32,108 INFO L93 Difference]: Finished difference Result 159 states and 196 transitions. [2021-05-02 17:59:32,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 17:59:32,108 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.75) internal successors, (150), 39 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-02 17:59:32,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:59:32,109 INFO L225 Difference]: With dead ends: 159 [2021-05-02 17:59:32,109 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 17:59:32,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 124 SyntacticMatches, 29 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 2322.0ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 17:59:32,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 17:59:32,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 156. [2021-05-02 17:59:32,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.2450331125827814) internal successors, (188), 151 states have internal predecessors, (188), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:32,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 192 transitions. [2021-05-02 17:59:32,111 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 192 transitions. Word has length 151 [2021-05-02 17:59:32,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:59:32,111 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 192 transitions. [2021-05-02 17:59:32,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.75) internal successors, (150), 39 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:32,112 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 192 transitions. [2021-05-02 17:59:32,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 17:59:32,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:59:32,112 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:59:32,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:59:32,317 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:59:32,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:59:32,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1374339628, now seen corresponding path program 36 times [2021-05-02 17:59:32,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:59:32,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491816367] [2021-05-02 17:59:32,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:59:32,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:33,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:59:33,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:33,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 0 proven. 3816 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:59:33,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:59:33,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491816367] [2021-05-02 17:59:33,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491816367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:33,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273050919] [2021-05-02 17:59:33,099 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:59:59,109 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 50 check-sat command(s) [2021-05-02 17:59:59,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:59:59,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 111 conjunts are in the unsatisfiable core [2021-05-02 17:59:59,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:59:59,886 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 0 proven. 3816 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:59:59,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273050919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:59,887 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:59:59,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 17:59:59,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966589433] [2021-05-02 17:59:59,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 17:59:59,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:59:59,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 17:59:59,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 17:59:59,888 INFO L87 Difference]: Start difference. First operand 156 states and 192 transitions. Second operand has 41 states, 41 states have (on average 3.7560975609756095) internal successors, (154), 40 states have internal predecessors, (154), 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 18:00:02,310 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 18:00:04,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:04,023 INFO L93 Difference]: Finished difference Result 163 states and 201 transitions. [2021-05-02 18:00:04,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:00:04,025 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.7560975609756095) internal successors, (154), 40 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-02 18:00:04,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:04,026 INFO L225 Difference]: With dead ends: 163 [2021-05-02 18:00:04,026 INFO L226 Difference]: Without dead ends: 163 [2021-05-02 18:00:04,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 129 SyntacticMatches, 28 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 2633.7ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:00:04,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-05-02 18:00:04,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 160. [2021-05-02 18:00:04,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.2451612903225806) internal successors, (193), 155 states have internal predecessors, (193), 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 18:00:04,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 197 transitions. [2021-05-02 18:00:04,028 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 197 transitions. Word has length 155 [2021-05-02 18:00:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:04,028 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 197 transitions. [2021-05-02 18:00:04,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.7560975609756095) internal successors, (154), 40 states have internal predecessors, (154), 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 18:00:04,029 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 197 transitions. [2021-05-02 18:00:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-02 18:00:04,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:04,029 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:04,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:00:04,230 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:04,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:04,230 INFO L82 PathProgramCache]: Analyzing trace with hash 673705924, now seen corresponding path program 37 times [2021-05-02 18:00:04,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:04,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546050979] [2021-05-02 18:00:04,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:05,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:05,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:05,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4070 backedges. 0 proven. 4033 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 18:00:05,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:05,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546050979] [2021-05-02 18:00:05,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546050979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:05,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242914377] [2021-05-02 18:00:05,162 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:05,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:05,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 18:00:05,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:05,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:05,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4070 backedges. 0 proven. 4033 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 18:00:05,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242914377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:05,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:05,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 18:00:05,647 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63765880] [2021-05-02 18:00:05,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:00:05,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:05,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:00:05,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:00:05,648 INFO L87 Difference]: Start difference. First operand 160 states and 197 transitions. Second operand has 42 states, 42 states have (on average 3.761904761904762) internal successors, (158), 41 states have internal predecessors, (158), 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 18:00:09,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:09,839 INFO L93 Difference]: Finished difference Result 167 states and 206 transitions. [2021-05-02 18:00:09,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:00:09,840 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.761904761904762) internal successors, (158), 41 states have internal predecessors, (158), 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 159 [2021-05-02 18:00:09,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:09,840 INFO L225 Difference]: With dead ends: 167 [2021-05-02 18:00:09,840 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 18:00:09,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 160 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2150.1ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 18:00:09,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 18:00:09,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 164. [2021-05-02 18:00:09,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.2452830188679245) internal successors, (198), 159 states have internal predecessors, (198), 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 18:00:09,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 202 transitions. [2021-05-02 18:00:09,843 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 202 transitions. Word has length 159 [2021-05-02 18:00:09,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:09,843 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 202 transitions. [2021-05-02 18:00:09,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.761904761904762) internal successors, (158), 41 states have internal predecessors, (158), 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 18:00:09,843 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 202 transitions. [2021-05-02 18:00:09,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-02 18:00:09,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:09,844 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:10,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 18:00:10,060 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:10,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:10,061 INFO L82 PathProgramCache]: Analyzing trace with hash 442798428, now seen corresponding path program 38 times [2021-05-02 18:00:10,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:10,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778176939] [2021-05-02 18:00:10,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:10,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:11,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:11,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:11,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 0 proven. 4256 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 18:00:11,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:11,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778176939] [2021-05-02 18:00:11,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778176939] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:11,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625771155] [2021-05-02 18:00:11,034 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:11,183 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:00:11,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:11,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 18:00:11,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:11,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:11,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 0 proven. 4256 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 18:00:11,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625771155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:11,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:11,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 18:00:11,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705895958] [2021-05-02 18:00:11,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:00:11,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:11,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:00:11,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:00:11,552 INFO L87 Difference]: Start difference. First operand 164 states and 202 transitions. Second operand has 43 states, 43 states have (on average 3.7674418604651163) internal successors, (162), 42 states have internal predecessors, (162), 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 18:00:16,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:16,703 INFO L93 Difference]: Finished difference Result 171 states and 211 transitions. [2021-05-02 18:00:16,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 18:00:16,704 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.7674418604651163) internal successors, (162), 42 states have internal predecessors, (162), 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 163 [2021-05-02 18:00:16,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:16,704 INFO L225 Difference]: With dead ends: 171 [2021-05-02 18:00:16,704 INFO L226 Difference]: Without dead ends: 171 [2021-05-02 18:00:16,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2533.5ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:00:16,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-05-02 18:00:16,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 168. [2021-05-02 18:00:16,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.2453987730061349) internal successors, (203), 163 states have internal predecessors, (203), 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 18:00:16,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 207 transitions. [2021-05-02 18:00:16,707 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 207 transitions. Word has length 163 [2021-05-02 18:00:16,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:16,707 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 207 transitions. [2021-05-02 18:00:16,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.7674418604651163) internal successors, (162), 42 states have internal predecessors, (162), 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 18:00:16,708 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 207 transitions. [2021-05-02 18:00:16,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 18:00:16,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:16,708 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:16,926 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:00:16,926 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:16,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:16,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1942398708, now seen corresponding path program 39 times [2021-05-02 18:00:16,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:16,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50864600] [2021-05-02 18:00:16,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:16,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:17,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:17,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:17,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4524 backedges. 0 proven. 4485 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 18:00:17,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:17,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50864600] [2021-05-02 18:00:17,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50864600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:17,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079207529] [2021-05-02 18:00:17,926 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:38,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2021-05-02 18:00:38,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:38,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 18:00:38,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:39,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:39,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:39,856 INFO L134 CoverageAnalysis]: Checked inductivity of 4524 backedges. 0 proven. 4485 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 18:00:39,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079207529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:39,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:39,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:00:39,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857575307] [2021-05-02 18:00:39,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:00:39,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:39,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:00:39,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:00:39,857 INFO L87 Difference]: Start difference. First operand 168 states and 207 transitions. Second operand has 44 states, 44 states have (on average 3.772727272727273) internal successors, (166), 43 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 18:00:44,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:44,640 INFO L93 Difference]: Finished difference Result 175 states and 216 transitions. [2021-05-02 18:00:44,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:00:44,641 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.772727272727273) internal successors, (166), 43 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 167 [2021-05-02 18:00:44,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:44,642 INFO L225 Difference]: With dead ends: 175 [2021-05-02 18:00:44,642 INFO L226 Difference]: Without dead ends: 175 [2021-05-02 18:00:44,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 142 SyntacticMatches, 27 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 3002.0ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:00:44,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-05-02 18:00:44,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 172. [2021-05-02 18:00:44,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.2455089820359282) internal successors, (208), 167 states have internal predecessors, (208), 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 18:00:44,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 212 transitions. [2021-05-02 18:00:44,644 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 212 transitions. Word has length 167 [2021-05-02 18:00:44,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:44,645 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 212 transitions. [2021-05-02 18:00:44,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.772727272727273) internal successors, (166), 43 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 18:00:44,645 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 212 transitions. [2021-05-02 18:00:44,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-05-02 18:00:44,645 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:44,645 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:44,853 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:44,853 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:44,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:44,854 INFO L82 PathProgramCache]: Analyzing trace with hash 2087989388, now seen corresponding path program 40 times [2021-05-02 18:00:44,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:44,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949674876] [2021-05-02 18:00:44,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:44,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:45,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:45,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:45,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 0 proven. 4720 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:00:45,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:45,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949674876] [2021-05-02 18:00:45,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949674876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:45,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582226786] [2021-05-02 18:00:45,849 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:45,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:00:45,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:45,889 WARN L261 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 18:00:45,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:46,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:46,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:46,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:46,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 0 proven. 4720 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:00:46,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582226786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:46,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:46,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 47 [2021-05-02 18:00:46,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489997266] [2021-05-02 18:00:46,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:00:46,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:46,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:00:46,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2030, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:00:46,293 INFO L87 Difference]: Start difference. First operand 172 states and 212 transitions. Second operand has 47 states, 47 states have (on average 3.6595744680851063) internal successors, (172), 45 states have internal predecessors, (172), 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 18:00:51,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:51,431 INFO L93 Difference]: Finished difference Result 179 states and 221 transitions. [2021-05-02 18:00:51,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:00:51,432 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.6595744680851063) internal successors, (172), 45 states have internal predecessors, (172), 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 171 [2021-05-02 18:00:51,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:51,432 INFO L225 Difference]: With dead ends: 179 [2021-05-02 18:00:51,432 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 18:00:51,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 170 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 2581.6ms TimeCoverageRelationStatistics Valid=337, Invalid=7319, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:00:51,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 18:00:51,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 176. [2021-05-02 18:00:51,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.2456140350877194) internal successors, (213), 171 states have internal predecessors, (213), 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 18:00:51,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 217 transitions. [2021-05-02 18:00:51,435 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 217 transitions. Word has length 171 [2021-05-02 18:00:51,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:51,435 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 217 transitions. [2021-05-02 18:00:51,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.6595744680851063) internal successors, (172), 45 states have internal predecessors, (172), 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 18:00:51,435 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 217 transitions. [2021-05-02 18:00:51,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-02 18:00:51,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:51,436 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:51,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:51,649 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:51,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:51,649 INFO L82 PathProgramCache]: Analyzing trace with hash -107794908, now seen corresponding path program 41 times [2021-05-02 18:00:51,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:51,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291665103] [2021-05-02 18:00:51,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:51,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:52,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:52,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:52,755 INFO L134 CoverageAnalysis]: Checked inductivity of 5002 backedges. 0 proven. 4961 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-05-02 18:00:52,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:52,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291665103] [2021-05-02 18:00:52,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291665103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:52,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801271513] [2021-05-02 18:00:52,755 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:02:55,411 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 56 check-sat command(s) [2021-05-02 18:02:55,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:02:55,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 153 conjunts are in the unsatisfiable core [2021-05-02 18:02:55,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:02:55,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:55,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:55,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:56,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:56,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:56,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:57,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:02:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5002 backedges. 0 proven. 4966 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:02:57,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801271513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:02:57,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:02:57,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 53] total 55 [2021-05-02 18:02:57,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417174964] [2021-05-02 18:02:57,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:02:57,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:02:57,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:02:57,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2803, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:02:57,169 INFO L87 Difference]: Start difference. First operand 176 states and 217 transitions. Second operand has 55 states, 55 states have (on average 3.418181818181818) internal successors, (188), 54 states have internal predecessors, (188), 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 18:03:03,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:03:03,701 INFO L93 Difference]: Finished difference Result 183 states and 226 transitions. [2021-05-02 18:03:03,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:03:03,702 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.418181818181818) internal successors, (188), 54 states have internal predecessors, (188), 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 175 [2021-05-02 18:03:03,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:03:03,702 INFO L225 Difference]: With dead ends: 183 [2021-05-02 18:03:03,703 INFO L226 Difference]: Without dead ends: 183 [2021-05-02 18:03:03,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 132 SyntacticMatches, 36 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 4224.2ms TimeCoverageRelationStatistics Valid=426, Invalid=10286, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:03:03,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-02 18:03:03,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 180. [2021-05-02 18:03:03,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.2457142857142858) internal successors, (218), 175 states have internal predecessors, (218), 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 18:03:03,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 222 transitions. [2021-05-02 18:03:03,705 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 222 transitions. Word has length 175 [2021-05-02 18:03:03,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:03:03,706 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 222 transitions. [2021-05-02 18:03:03,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.418181818181818) internal successors, (188), 54 states have internal predecessors, (188), 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 18:03:03,706 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 222 transitions. [2021-05-02 18:03:03,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 18:03:03,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:03:03,706 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:03:03,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-02 18:03:03,916 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:03:03,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:03:03,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1387683908, now seen corresponding path program 42 times [2021-05-02 18:03:03,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:03:03,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137963474] [2021-05-02 18:03:03,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:03:03,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:03:05,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:03:05,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:03:05,005 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 0 proven. 5208 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 18:03:05,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:03:05,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137963474] [2021-05-02 18:03:05,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137963474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:03:05,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263014062] [2021-05-02 18:03:05,005 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:04:35,459 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 58 check-sat command(s) [2021-05-02 18:04:35,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:04:35,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 166 conjunts are in the unsatisfiable core [2021-05-02 18:04:35,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:04:35,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:35,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:36,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:37,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:37,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:37,691 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 0 proven. 5217 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 18:04:37,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263014062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:04:37,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:04:37,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 62] total 64 [2021-05-02 18:04:37,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268984950] [2021-05-02 18:04:37,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 18:04:37,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:04:37,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 18:04:37,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3830, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:04:37,692 INFO L87 Difference]: Start difference. First operand 180 states and 222 transitions. Second operand has 64 states, 64 states have (on average 3.1875) internal successors, (204), 63 states have internal predecessors, (204), 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 18:04:45,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:04:45,838 INFO L93 Difference]: Finished difference Result 187 states and 231 transitions. [2021-05-02 18:04:45,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 18:04:45,839 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.1875) internal successors, (204), 63 states have internal predecessors, (204), 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 179 [2021-05-02 18:04:45,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:04:45,840 INFO L225 Difference]: With dead ends: 187 [2021-05-02 18:04:45,840 INFO L226 Difference]: Without dead ends: 187 [2021-05-02 18:04:45,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 141 SyntacticMatches, 23 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3101 ImplicationChecksByTransitivity, 5191.8ms TimeCoverageRelationStatistics Valid=522, Invalid=14240, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 18:04:45,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-02 18:04:45,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 184. [2021-05-02 18:04:45,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.2458100558659218) internal successors, (223), 179 states have internal predecessors, (223), 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 18:04:45,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 227 transitions. [2021-05-02 18:04:45,843 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 227 transitions. Word has length 179 [2021-05-02 18:04:45,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:04:45,843 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 227 transitions. [2021-05-02 18:04:45,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 3.1875) internal successors, (204), 63 states have internal predecessors, (204), 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 18:04:45,843 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 227 transitions. [2021-05-02 18:04:45,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-05-02 18:04:45,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:04:45,843 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:04:46,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:04:46,053 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:04:46,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:04:46,054 INFO L82 PathProgramCache]: Analyzing trace with hash -692222636, now seen corresponding path program 43 times [2021-05-02 18:04:46,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:04:46,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532450229] [2021-05-02 18:04:46,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:04:46,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:04:47,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:04:47,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:04:47,173 INFO L134 CoverageAnalysis]: Checked inductivity of 5504 backedges. 0 proven. 5461 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-05-02 18:04:47,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:04:47,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532450229] [2021-05-02 18:04:47,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532450229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:04:47,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893168891] [2021-05-02 18:04:47,173 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:04:47,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:04:47,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:04:47,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:04:47,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:47,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5504 backedges. 0 proven. 5461 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-05-02 18:04:47,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893168891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:04:47,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:04:47,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 18:04:47,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588605823] [2021-05-02 18:04:47,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 18:04:47,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:04:47,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 18:04:47,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:04:47,682 INFO L87 Difference]: Start difference. First operand 184 states and 227 transitions. Second operand has 48 states, 48 states have (on average 3.7916666666666665) internal successors, (182), 47 states have internal predecessors, (182), 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 18:04:53,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:04:53,483 INFO L93 Difference]: Finished difference Result 191 states and 236 transitions. [2021-05-02 18:04:53,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:04:53,484 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.7916666666666665) internal successors, (182), 47 states have internal predecessors, (182), 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 183 [2021-05-02 18:04:53,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:04:53,485 INFO L225 Difference]: With dead ends: 191 [2021-05-02 18:04:53,485 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 18:04:53,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 2787.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 18:04:53,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 18:04:53,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 188. [2021-05-02 18:04:53,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 183 states have (on average 1.2459016393442623) internal successors, (228), 183 states have internal predecessors, (228), 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 18:04:53,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 232 transitions. [2021-05-02 18:04:53,487 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 232 transitions. Word has length 183 [2021-05-02 18:04:53,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:04:53,487 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 232 transitions. [2021-05-02 18:04:53,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.7916666666666665) internal successors, (182), 47 states have internal predecessors, (182), 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 18:04:53,488 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 232 transitions. [2021-05-02 18:04:53,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-02 18:04:53,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:04:53,488 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:04:53,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:04:53,693 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:04:53,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:04:53,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1307255060, now seen corresponding path program 44 times [2021-05-02 18:04:53,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:04:53,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059005475] [2021-05-02 18:04:53,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:04:53,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:04:54,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:04:54,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:04:54,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 0 proven. 5720 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 18:04:54,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:04:54,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059005475] [2021-05-02 18:04:54,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059005475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:04:54,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091431644] [2021-05-02 18:04:54,879 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:04:55,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:04:55,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:04:55,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:04:55,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:04:55,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:04:55,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 0 proven. 5720 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 18:04:55,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091431644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:04:55,378 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:04:55,378 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 18:04:55,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739218474] [2021-05-02 18:04:55,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:04:55,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:04:55,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:04:55,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:04:55,379 INFO L87 Difference]: Start difference. First operand 188 states and 232 transitions. Second operand has 49 states, 49 states have (on average 3.795918367346939) internal successors, (186), 48 states have internal predecessors, (186), 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 18:05:01,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:01,377 INFO L93 Difference]: Finished difference Result 195 states and 241 transitions. [2021-05-02 18:05:01,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 18:05:01,379 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.795918367346939) internal successors, (186), 48 states have internal predecessors, (186), 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 187 [2021-05-02 18:05:01,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:01,380 INFO L225 Difference]: With dead ends: 195 [2021-05-02 18:05:01,380 INFO L226 Difference]: Without dead ends: 195 [2021-05-02 18:05:01,380 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2877.5ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:05:01,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-05-02 18:05:01,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 192. [2021-05-02 18:05:01,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.2459893048128343) internal successors, (233), 187 states have internal predecessors, (233), 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 18:05:01,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 237 transitions. [2021-05-02 18:05:01,382 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 237 transitions. Word has length 187 [2021-05-02 18:05:01,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:01,382 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 237 transitions. [2021-05-02 18:05:01,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.795918367346939) internal successors, (186), 48 states have internal predecessors, (186), 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 18:05:01,383 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 237 transitions. [2021-05-02 18:05:01,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 18:05:01,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:01,383 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:01,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 18:05:01,601 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:01,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:01,601 INFO L82 PathProgramCache]: Analyzing trace with hash -126505852, now seen corresponding path program 45 times [2021-05-02 18:05:01,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:01,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654912284] [2021-05-02 18:05:01,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:01,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:02,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:02,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:03,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 18:05:03,022 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:03,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654912284] [2021-05-02 18:05:03,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654912284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:03,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419919120] [2021-05-02 18:05:03,022 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:30,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2021-05-02 18:05:30,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:30,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 18:05:30,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:30,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:30,990 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 18:05:30,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419919120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:30,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:30,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:05:30,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432520374] [2021-05-02 18:05:30,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:05:30,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:30,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:05:30,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:05:30,992 INFO L87 Difference]: Start difference. First operand 192 states and 237 transitions. Second operand has 50 states, 50 states have (on average 3.8) internal successors, (190), 49 states have internal predecessors, (190), 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 18:05:38,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:38,111 INFO L93 Difference]: Finished difference Result 199 states and 246 transitions. [2021-05-02 18:05:38,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:05:38,112 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.8) internal successors, (190), 49 states have internal predecessors, (190), 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 191 [2021-05-02 18:05:38,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:38,112 INFO L225 Difference]: With dead ends: 199 [2021-05-02 18:05:38,112 INFO L226 Difference]: Without dead ends: 199 [2021-05-02 18:05:38,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 178 SyntacticMatches, 15 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1067 ImplicationChecksByTransitivity, 3919.1ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:05:38,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-02 18:05:38,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 196. [2021-05-02 18:05:38,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.2460732984293195) internal successors, (238), 191 states have internal predecessors, (238), 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 18:05:38,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 242 transitions. [2021-05-02 18:05:38,119 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 242 transitions. Word has length 191 [2021-05-02 18:05:38,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:38,120 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 242 transitions. [2021-05-02 18:05:38,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.8) internal successors, (190), 49 states have internal predecessors, (190), 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 18:05:38,120 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 242 transitions. [2021-05-02 18:05:38,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-05-02 18:05:38,120 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:38,120 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:38,329 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 18:05:38,330 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:38,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:38,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1611001372, now seen corresponding path program 46 times [2021-05-02 18:05:38,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:38,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535701753] [2021-05-02 18:05:38,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:38,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:39,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:39,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:39,753 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 0 proven. 6256 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 18:05:39,753 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:39,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535701753] [2021-05-02 18:05:39,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535701753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:39,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982727826] [2021-05-02 18:05:39,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:39,803 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:05:39,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:39,804 WARN L261 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 18:05:39,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:40,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:40,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:40,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:40,351 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 0 proven. 6256 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 18:05:40,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982727826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:40,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:40,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51] total 53 [2021-05-02 18:05:40,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321199876] [2021-05-02 18:05:40,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:05:40,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:40,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:05:40,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2606, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:05:40,353 INFO L87 Difference]: Start difference. First operand 196 states and 242 transitions. Second operand has 53 states, 53 states have (on average 3.69811320754717) internal successors, (196), 51 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 18:05:47,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:47,737 INFO L93 Difference]: Finished difference Result 203 states and 251 transitions. [2021-05-02 18:05:47,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:05:47,738 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.69811320754717) internal successors, (196), 51 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 195 [2021-05-02 18:05:47,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:47,739 INFO L225 Difference]: With dead ends: 203 [2021-05-02 18:05:47,739 INFO L226 Difference]: Without dead ends: 203 [2021-05-02 18:05:47,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1089 ImplicationChecksByTransitivity, 3499.4ms TimeCoverageRelationStatistics Valid=385, Invalid=9515, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 18:05:47,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-02 18:05:47,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 200. [2021-05-02 18:05:47,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 195 states have (on average 1.2461538461538462) internal successors, (243), 195 states have internal predecessors, (243), 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 18:05:47,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 247 transitions. [2021-05-02 18:05:47,742 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 247 transitions. Word has length 195 [2021-05-02 18:05:47,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:47,742 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 247 transitions. [2021-05-02 18:05:47,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.69811320754717) internal successors, (196), 51 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 18:05:47,742 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 247 transitions. [2021-05-02 18:05:47,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-05-02 18:05:47,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:47,747 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:47,947 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 18:05:47,948 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:47,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:47,959 INFO L82 PathProgramCache]: Analyzing trace with hash 468427700, now seen corresponding path program 47 times [2021-05-02 18:05:47,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:47,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057967489] [2021-05-02 18:05:47,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:48,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:49,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:49,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:49,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 0 proven. 6533 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 18:05:49,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:49,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057967489] [2021-05-02 18:05:49,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057967489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:49,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125997261] [2021-05-02 18:05:49,459 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true