/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/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/loop-invgen/heapsort.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-18 21:57:01,345 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 21:57:01,346 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 21:57:01,384 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-18 21:57:01,385 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-18 21:57:01,386 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-18 21:57:01,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-18 21:57:01,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-18 21:57:01,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-18 21:57:01,402 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-18 21:57:01,403 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-18 21:57:01,404 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-18 21:57:01,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-18 21:57:01,406 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-18 21:57:01,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-18 21:57:01,407 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-18 21:57:01,408 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-18 21:57:01,409 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-18 21:57:01,411 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-18 21:57:01,416 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-18 21:57:01,417 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-18 21:57:01,418 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-18 21:57:01,419 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-18 21:57:01,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-18 21:57:01,420 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-18 21:57:01,425 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-18 21:57:01,425 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-18 21:57:01,425 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-18 21:57:01,426 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-18 21:57:01,426 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-18 21:57:01,427 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-18 21:57:01,427 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-18 21:57:01,429 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-18 21:57:01,429 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-18 21:57:01,429 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-18 21:57:01,430 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-18 21:57:01,430 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-18 21:57:01,431 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-18 21:57:01,431 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-18 21:57:01,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 21:57:01,431 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 21:57:01,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 21:57:01,433 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-03-18 21:57:01,453 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 21:57:01,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 21:57:01,455 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-18 21:57:01,455 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-18 21:57:01,456 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-18 21:57:01,456 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-18 21:57:01,456 INFO L138 SettingsManager]: * Use SBE=true [2022-03-18 21:57:01,456 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 21:57:01,457 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 21:57:01,458 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 21:57:01,458 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 21:57:01,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-03-18 21:57:01,459 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-03-18 21:57:01,460 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-03-18 21:57:01,460 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 21:57:01,671 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 21:57:01,695 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 21:57:01,697 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 21:57:01,697 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 21:57:01,698 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 21:57:01,699 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/heapsort.i [2022-03-18 21:57:01,756 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14cefd854/9f6a42fa5d8d45249cc050056d2a3e1f/FLAG9f7a5323a [2022-03-18 21:57:02,101 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 21:57:02,101 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/heapsort.i [2022-03-18 21:57:02,107 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14cefd854/9f6a42fa5d8d45249cc050056d2a3e1f/FLAG9f7a5323a [2022-03-18 21:57:02,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14cefd854/9f6a42fa5d8d45249cc050056d2a3e1f [2022-03-18 21:57:02,123 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 21:57:02,124 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-03-18 21:57:02,126 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 21:57:02,127 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 21:57:02,129 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 21:57:02,130 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,131 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@443d1d2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02, skipping insertion in model container [2022-03-18 21:57:02,131 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,136 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 21:57:02,150 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 21:57:02,290 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/heapsort.i[893,906] [2022-03-18 21:57:02,328 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 21:57:02,333 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 21:57:02,341 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/heapsort.i[893,906] [2022-03-18 21:57:02,346 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 21:57:02,355 INFO L208 MainTranslator]: Completed translation [2022-03-18 21:57:02,356 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02 WrapperNode [2022-03-18 21:57:02,356 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 21:57:02,357 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 21:57:02,357 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 21:57:02,357 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 21:57:02,364 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,364 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,369 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,369 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,372 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,375 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,376 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,377 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 21:57:02,378 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 21:57:02,378 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 21:57:02,378 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 21:57:02,379 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 21:57:02,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:02,401 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 21:57:02,428 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 21:57:02,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 21:57:02,439 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 21:57:02,439 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 21:57:02,439 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 21:57:02,439 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 21:57:02,439 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 21:57:02,439 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 21:57:02,440 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 21:57:02,440 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 21:57:02,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 21:57:02,514 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 21:57:02,516 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 21:57:02,696 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 21:57:02,701 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 21:57:02,701 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-18 21:57:02,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 09:57:02 BoogieIcfgContainer [2022-03-18 21:57:02,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 21:57:02,703 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-03-18 21:57:02,703 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-03-18 21:57:02,716 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-03-18 21:57:02,718 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 09:57:02" (1/1) ... [2022-03-18 21:57:02,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 18.03 09:57:02 BasicIcfg [2022-03-18 21:57:02,739 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-03-18 21:57:02,741 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 21:57:02,741 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 21:57:02,743 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 21:57:02,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 09:57:02" (1/4) ... [2022-03-18 21:57:02,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69f22884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 09:57:02, skipping insertion in model container [2022-03-18 21:57:02,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 09:57:02" (2/4) ... [2022-03-18 21:57:02,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69f22884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 09:57:02, skipping insertion in model container [2022-03-18 21:57:02,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 09:57:02" (3/4) ... [2022-03-18 21:57:02,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69f22884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.03 09:57:02, skipping insertion in model container [2022-03-18 21:57:02,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 18.03 09:57:02" (4/4) ... [2022-03-18 21:57:02,746 INFO L111 eAbstractionObserver]: Analyzing ICFG heapsort.iqvasr [2022-03-18 21:57:02,750 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-18 21:57:02,750 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 21:57:02,792 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 21:57:02,799 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 21:57:02,799 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 21:57:02,821 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 16 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-18 21:57:02,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 21:57:02,825 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:02,825 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:02,826 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:02,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:02,830 INFO L85 PathProgramCache]: Analyzing trace with hash -972496655, now seen corresponding path program 1 times [2022-03-18 21:57:02,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:02,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578234833] [2022-03-18 21:57:02,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:02,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:02,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:02,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:02,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:03,001 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:03,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578234833] [2022-03-18 21:57:03,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578234833] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:03,002 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:03,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 21:57:03,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456531322] [2022-03-18 21:57:03,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:03,006 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 21:57:03,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:03,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 21:57:03,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 21:57:03,030 INFO L87 Difference]: Start difference. First operand has 44 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 16 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:03,147 INFO L93 Difference]: Finished difference Result 80 states and 138 transitions. [2022-03-18 21:57:03,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 21:57:03,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 15 [2022-03-18 21:57:03,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:03,156 INFO L225 Difference]: With dead ends: 80 [2022-03-18 21:57:03,156 INFO L226 Difference]: Without dead ends: 39 [2022-03-18 21:57:03,160 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 21:57:03,162 INFO L912 BasicCegarLoop]: 50 mSDtfsCounter, 29 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:03,163 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 53 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:03,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-18 21:57:03,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-18 21:57:03,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 16 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 21:57:03,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 58 transitions. [2022-03-18 21:57:03,204 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 58 transitions. Word has length 15 [2022-03-18 21:57:03,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:03,204 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 58 transitions. [2022-03-18 21:57:03,205 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,205 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 58 transitions. [2022-03-18 21:57:03,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 21:57:03,206 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:03,206 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:03,206 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 21:57:03,207 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:03,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:03,209 INFO L85 PathProgramCache]: Analyzing trace with hash -943867504, now seen corresponding path program 1 times [2022-03-18 21:57:03,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:03,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789328130] [2022-03-18 21:57:03,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:03,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:03,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:03,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:03,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:03,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789328130] [2022-03-18 21:57:03,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789328130] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:03,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:03,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 21:57:03,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137595954] [2022-03-18 21:57:03,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:03,321 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:03,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:03,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:03,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 21:57:03,323 INFO L87 Difference]: Start difference. First operand 39 states and 58 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:03,508 INFO L93 Difference]: Finished difference Result 46 states and 64 transitions. [2022-03-18 21:57:03,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 21:57:03,509 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 15 [2022-03-18 21:57:03,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:03,510 INFO L225 Difference]: With dead ends: 46 [2022-03-18 21:57:03,510 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 21:57:03,510 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 21:57:03,511 INFO L912 BasicCegarLoop]: 35 mSDtfsCounter, 46 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:03,512 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 52 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:03,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 21:57:03,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-18 21:57:03,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 21:57:03,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 61 transitions. [2022-03-18 21:57:03,535 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 61 transitions. Word has length 15 [2022-03-18 21:57:03,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:03,535 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 61 transitions. [2022-03-18 21:57:03,535 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,535 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 61 transitions. [2022-03-18 21:57:03,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 21:57:03,536 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:03,536 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:03,536 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 21:57:03,536 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:03,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:03,536 INFO L85 PathProgramCache]: Analyzing trace with hash -944820816, now seen corresponding path program 1 times [2022-03-18 21:57:03,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:03,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599241923] [2022-03-18 21:57:03,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:03,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:03,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:03,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:03,582 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:03,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599241923] [2022-03-18 21:57:03,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599241923] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:03,582 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:03,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 21:57:03,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371024363] [2022-03-18 21:57:03,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:03,583 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:03,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:03,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:03,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 21:57:03,584 INFO L87 Difference]: Start difference. First operand 43 states and 61 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:03,777 INFO L93 Difference]: Finished difference Result 71 states and 105 transitions. [2022-03-18 21:57:03,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 21:57:03,777 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 15 [2022-03-18 21:57:03,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:03,778 INFO L225 Difference]: With dead ends: 71 [2022-03-18 21:57:03,778 INFO L226 Difference]: Without dead ends: 69 [2022-03-18 21:57:03,778 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 21:57:03,779 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 57 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:03,780 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 56 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:03,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-18 21:57:03,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 47. [2022-03-18 21:57:03,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 21:57:03,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2022-03-18 21:57:03,787 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 15 [2022-03-18 21:57:03,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:03,787 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2022-03-18 21:57:03,787 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-03-18 21:57:03,787 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2022-03-18 21:57:03,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 21:57:03,788 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:03,788 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:03,788 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-18 21:57:03,788 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:03,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:03,789 INFO L85 PathProgramCache]: Analyzing trace with hash -914285041, now seen corresponding path program 1 times [2022-03-18 21:57:03,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:03,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878671602] [2022-03-18 21:57:03,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:03,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:03,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:03,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:03,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:03,849 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:03,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878671602] [2022-03-18 21:57:03,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878671602] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:03,850 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:03,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 21:57:03,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889679] [2022-03-18 21:57:03,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:03,850 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 21:57:03,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:03,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 21:57:03,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-18 21:57:03,851 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 states have internal predecessors, (11), 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) [2022-03-18 21:57:04,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:04,105 INFO L93 Difference]: Finished difference Result 80 states and 115 transitions. [2022-03-18 21:57:04,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:04,106 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 states have internal predecessors, (11), 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 15 [2022-03-18 21:57:04,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:04,107 INFO L225 Difference]: With dead ends: 80 [2022-03-18 21:57:04,107 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 21:57:04,107 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-18 21:57:04,108 INFO L912 BasicCegarLoop]: 33 mSDtfsCounter, 65 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:04,108 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 55 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:04,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 21:57:04,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2022-03-18 21:57:04,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 28 states have call successors, (28), 6 states have call predecessors, (28), 5 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-03-18 21:57:04,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 106 transitions. [2022-03-18 21:57:04,117 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 106 transitions. Word has length 15 [2022-03-18 21:57:04,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:04,117 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 106 transitions. [2022-03-18 21:57:04,117 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 states have internal predecessors, (11), 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) [2022-03-18 21:57:04,118 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 106 transitions. [2022-03-18 21:57:04,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 21:57:04,118 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:04,118 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:04,118 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-18 21:57:04,118 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:04,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:04,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1889400257, now seen corresponding path program 1 times [2022-03-18 21:57:04,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:04,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114879985] [2022-03-18 21:57:04,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:04,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:04,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:04,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,172 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:04,172 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:04,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114879985] [2022-03-18 21:57:04,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114879985] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:04,172 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:04,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 21:57:04,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989956262] [2022-03-18 21:57:04,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:04,173 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:04,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:04,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:04,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 21:57:04,174 INFO L87 Difference]: Start difference. First operand 73 states and 106 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:04,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:04,308 INFO L93 Difference]: Finished difference Result 79 states and 111 transitions. [2022-03-18 21:57:04,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 21:57:04,309 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 21:57:04,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:04,311 INFO L225 Difference]: With dead ends: 79 [2022-03-18 21:57:04,311 INFO L226 Difference]: Without dead ends: 77 [2022-03-18 21:57:04,311 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 21:57:04,316 INFO L912 BasicCegarLoop]: 38 mSDtfsCounter, 39 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:04,316 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 55 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:04,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-18 21:57:04,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-18 21:57:04,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 28 states have call successors, (28), 7 states have call predecessors, (28), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-03-18 21:57:04,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 109 transitions. [2022-03-18 21:57:04,330 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 109 transitions. Word has length 20 [2022-03-18 21:57:04,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:04,331 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 109 transitions. [2022-03-18 21:57:04,331 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:04,331 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 109 transitions. [2022-03-18 21:57:04,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 21:57:04,331 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:04,331 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:04,332 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-18 21:57:04,332 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:04,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:04,332 INFO L85 PathProgramCache]: Analyzing trace with hash -403505695, now seen corresponding path program 1 times [2022-03-18 21:57:04,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:04,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589802802] [2022-03-18 21:57:04,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:04,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:04,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:04,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:04,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:04,388 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:04,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589802802] [2022-03-18 21:57:04,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589802802] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:04,388 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:04,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:04,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518922700] [2022-03-18 21:57:04,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:04,389 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:04,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:04,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:04,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:04,389 INFO L87 Difference]: Start difference. First operand 77 states and 109 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:04,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:04,670 INFO L93 Difference]: Finished difference Result 110 states and 160 transitions. [2022-03-18 21:57:04,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:04,671 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 21:57:04,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:04,671 INFO L225 Difference]: With dead ends: 110 [2022-03-18 21:57:04,671 INFO L226 Difference]: Without dead ends: 108 [2022-03-18 21:57:04,672 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:04,672 INFO L912 BasicCegarLoop]: 42 mSDtfsCounter, 90 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:04,673 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 64 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:04,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-18 21:57:04,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 105. [2022-03-18 21:57:04,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 55 states have (on average 1.309090909090909) internal successors, (72), 56 states have internal predecessors, (72), 42 states have call successors, (42), 8 states have call predecessors, (42), 7 states have return successors, (41), 40 states have call predecessors, (41), 41 states have call successors, (41) [2022-03-18 21:57:04,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 155 transitions. [2022-03-18 21:57:04,687 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 155 transitions. Word has length 20 [2022-03-18 21:57:04,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:04,687 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 155 transitions. [2022-03-18 21:57:04,687 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:04,688 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 155 transitions. [2022-03-18 21:57:04,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 21:57:04,688 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:04,688 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:04,688 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-18 21:57:04,689 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:04,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:04,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1922571531, now seen corresponding path program 1 times [2022-03-18 21:57:04,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:04,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550686102] [2022-03-18 21:57:04,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:04,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:04,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:04,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:04,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:04,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:04,738 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:04,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550686102] [2022-03-18 21:57:04,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550686102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:04,738 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:04,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:04,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742614441] [2022-03-18 21:57:04,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:04,738 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:04,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:04,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:04,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:04,739 INFO L87 Difference]: Start difference. First operand 105 states and 155 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:05,044 INFO L93 Difference]: Finished difference Result 159 states and 244 transitions. [2022-03-18 21:57:05,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:05,045 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 21:57:05,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:05,046 INFO L225 Difference]: With dead ends: 159 [2022-03-18 21:57:05,046 INFO L226 Difference]: Without dead ends: 157 [2022-03-18 21:57:05,046 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:05,047 INFO L912 BasicCegarLoop]: 44 mSDtfsCounter, 96 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:05,047 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 66 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:05,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-03-18 21:57:05,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 141. [2022-03-18 21:57:05,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 70 states have (on average 1.3571428571428572) internal successors, (95), 73 states have internal predecessors, (95), 62 states have call successors, (62), 9 states have call predecessors, (62), 8 states have return successors, (61), 58 states have call predecessors, (61), 61 states have call successors, (61) [2022-03-18 21:57:05,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 218 transitions. [2022-03-18 21:57:05,066 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 218 transitions. Word has length 20 [2022-03-18 21:57:05,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:05,067 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 218 transitions. [2022-03-18 21:57:05,067 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,067 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 218 transitions. [2022-03-18 21:57:05,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 21:57:05,068 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:05,068 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:05,068 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-18 21:57:05,068 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:05,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:05,068 INFO L85 PathProgramCache]: Analyzing trace with hash -696908702, now seen corresponding path program 1 times [2022-03-18 21:57:05,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:05,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893974353] [2022-03-18 21:57:05,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:05,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:05,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:05,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:05,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:05,091 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:05,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893974353] [2022-03-18 21:57:05,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893974353] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:05,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:05,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 21:57:05,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026858165] [2022-03-18 21:57:05,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:05,092 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 21:57:05,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:05,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 21:57:05,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 21:57:05,092 INFO L87 Difference]: Start difference. First operand 141 states and 218 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:05,197 INFO L93 Difference]: Finished difference Result 278 states and 440 transitions. [2022-03-18 21:57:05,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 21:57:05,198 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 21:57:05,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:05,201 INFO L225 Difference]: With dead ends: 278 [2022-03-18 21:57:05,201 INFO L226 Difference]: Without dead ends: 209 [2022-03-18 21:57:05,201 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-18 21:57:05,202 INFO L912 BasicCegarLoop]: 54 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:05,202 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 61 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:05,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-03-18 21:57:05,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2022-03-18 21:57:05,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 100 states have (on average 1.4) internal successors, (140), 104 states have internal predecessors, (140), 100 states have call successors, (100), 9 states have call predecessors, (100), 8 states have return successors, (99), 95 states have call predecessors, (99), 99 states have call successors, (99) [2022-03-18 21:57:05,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 339 transitions. [2022-03-18 21:57:05,227 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 339 transitions. Word has length 20 [2022-03-18 21:57:05,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:05,227 INFO L478 AbstractCegarLoop]: Abstraction has 209 states and 339 transitions. [2022-03-18 21:57:05,228 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,228 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 339 transitions. [2022-03-18 21:57:05,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 21:57:05,228 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:05,228 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:05,229 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-18 21:57:05,229 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:05,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:05,229 INFO L85 PathProgramCache]: Analyzing trace with hash 2078992758, now seen corresponding path program 1 times [2022-03-18 21:57:05,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:05,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763075746] [2022-03-18 21:57:05,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:05,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:05,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:05,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,283 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 21:57:05,284 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:05,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763075746] [2022-03-18 21:57:05,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763075746] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:05,284 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:05,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 21:57:05,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443342844] [2022-03-18 21:57:05,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:05,284 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:05,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:05,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:05,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-18 21:57:05,285 INFO L87 Difference]: Start difference. First operand 209 states and 339 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, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:05,423 INFO L93 Difference]: Finished difference Result 234 states and 363 transitions. [2022-03-18 21:57:05,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 21:57:05,424 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, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 21:57:05,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:05,425 INFO L225 Difference]: With dead ends: 234 [2022-03-18 21:57:05,425 INFO L226 Difference]: Without dead ends: 187 [2022-03-18 21:57:05,426 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-18 21:57:05,428 INFO L912 BasicCegarLoop]: 44 mSDtfsCounter, 28 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:05,428 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 61 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:05,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-03-18 21:57:05,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2022-03-18 21:57:05,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 90 states have (on average 1.3888888888888888) internal successors, (125), 94 states have internal predecessors, (125), 88 states have call successors, (88), 9 states have call predecessors, (88), 8 states have return successors, (87), 83 states have call predecessors, (87), 87 states have call successors, (87) [2022-03-18 21:57:05,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 300 transitions. [2022-03-18 21:57:05,468 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 300 transitions. Word has length 20 [2022-03-18 21:57:05,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:05,469 INFO L478 AbstractCegarLoop]: Abstraction has 187 states and 300 transitions. [2022-03-18 21:57:05,469 INFO L479 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, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 21:57:05,469 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 300 transitions. [2022-03-18 21:57:05,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 21:57:05,470 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:05,470 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:05,471 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-18 21:57:05,471 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:05,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:05,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1238440984, now seen corresponding path program 1 times [2022-03-18 21:57:05,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:05,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904260606] [2022-03-18 21:57:05,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:05,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:05,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:05,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:05,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:05,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,552 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 21:57:05,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:05,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904260606] [2022-03-18 21:57:05,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904260606] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:05,552 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:05,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 21:57:05,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570446597] [2022-03-18 21:57:05,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:05,553 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 21:57:05,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:05,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 21:57:05,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-18 21:57:05,553 INFO L87 Difference]: Start difference. First operand 187 states and 300 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 21:57:05,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:05,804 INFO L93 Difference]: Finished difference Result 221 states and 352 transitions. [2022-03-18 21:57:05,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:05,804 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2022-03-18 21:57:05,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:05,806 INFO L225 Difference]: With dead ends: 221 [2022-03-18 21:57:05,806 INFO L226 Difference]: Without dead ends: 219 [2022-03-18 21:57:05,806 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-18 21:57:05,807 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 79 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:05,808 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 61 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:05,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-03-18 21:57:05,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 201. [2022-03-18 21:57:05,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 97 states have (on average 1.3814432989690721) internal successors, (134), 103 states have internal predecessors, (134), 94 states have call successors, (94), 10 states have call predecessors, (94), 9 states have return successors, (93), 87 states have call predecessors, (93), 93 states have call successors, (93) [2022-03-18 21:57:05,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 321 transitions. [2022-03-18 21:57:05,844 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 321 transitions. Word has length 27 [2022-03-18 21:57:05,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:05,846 INFO L478 AbstractCegarLoop]: Abstraction has 201 states and 321 transitions. [2022-03-18 21:57:05,846 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 21:57:05,846 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 321 transitions. [2022-03-18 21:57:05,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 21:57:05,849 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:05,849 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:05,849 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-18 21:57:05,849 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:05,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:05,850 INFO L85 PathProgramCache]: Analyzing trace with hash 511466180, now seen corresponding path program 1 times [2022-03-18 21:57:05,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:05,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503708446] [2022-03-18 21:57:05,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:05,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:05,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:05,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:05,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:05,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:05,906 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 21:57:05,907 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:05,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503708446] [2022-03-18 21:57:05,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503708446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:05,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:05,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 21:57:05,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559117827] [2022-03-18 21:57:05,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:05,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:05,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:05,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:05,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-18 21:57:05,908 INFO L87 Difference]: Start difference. First operand 201 states and 321 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 21:57:06,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:06,226 INFO L93 Difference]: Finished difference Result 524 states and 858 transitions. [2022-03-18 21:57:06,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 21:57:06,227 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-03-18 21:57:06,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:06,229 INFO L225 Difference]: With dead ends: 524 [2022-03-18 21:57:06,229 INFO L226 Difference]: Without dead ends: 370 [2022-03-18 21:57:06,230 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-03-18 21:57:06,230 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 130 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:06,230 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 43 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:06,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2022-03-18 21:57:06,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 201. [2022-03-18 21:57:06,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 97 states have (on average 1.3608247422680413) internal successors, (132), 103 states have internal predecessors, (132), 94 states have call successors, (94), 10 states have call predecessors, (94), 9 states have return successors, (93), 87 states have call predecessors, (93), 93 states have call successors, (93) [2022-03-18 21:57:06,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 319 transitions. [2022-03-18 21:57:06,257 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 319 transitions. Word has length 29 [2022-03-18 21:57:06,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:06,257 INFO L478 AbstractCegarLoop]: Abstraction has 201 states and 319 transitions. [2022-03-18 21:57:06,258 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 21:57:06,258 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 319 transitions. [2022-03-18 21:57:06,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-18 21:57:06,258 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:06,258 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:06,258 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-03-18 21:57:06,258 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:06,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:06,259 INFO L85 PathProgramCache]: Analyzing trace with hash 810931569, now seen corresponding path program 1 times [2022-03-18 21:57:06,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:06,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002965550] [2022-03-18 21:57:06,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:06,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:06,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:06,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:06,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:06,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 21:57:06,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,303 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 21:57:06,303 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:06,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002965550] [2022-03-18 21:57:06,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002965550] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:06,303 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:06,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 21:57:06,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631387997] [2022-03-18 21:57:06,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:06,304 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 21:57:06,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:06,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 21:57:06,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-18 21:57:06,304 INFO L87 Difference]: Start difference. First operand 201 states and 319 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 21:57:06,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:06,554 INFO L93 Difference]: Finished difference Result 295 states and 475 transitions. [2022-03-18 21:57:06,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 21:57:06,555 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-03-18 21:57:06,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:06,557 INFO L225 Difference]: With dead ends: 295 [2022-03-18 21:57:06,557 INFO L226 Difference]: Without dead ends: 293 [2022-03-18 21:57:06,557 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-18 21:57:06,557 INFO L912 BasicCegarLoop]: 53 mSDtfsCounter, 46 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:06,558 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 75 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:06,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-03-18 21:57:06,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 273. [2022-03-18 21:57:06,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 119 states have (on average 1.361344537815126) internal successors, (162), 133 states have internal predecessors, (162), 142 states have call successors, (142), 12 states have call predecessors, (142), 11 states have return successors, (141), 127 states have call predecessors, (141), 141 states have call successors, (141) [2022-03-18 21:57:06,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 445 transitions. [2022-03-18 21:57:06,595 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 445 transitions. Word has length 30 [2022-03-18 21:57:06,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:06,596 INFO L478 AbstractCegarLoop]: Abstraction has 273 states and 445 transitions. [2022-03-18 21:57:06,596 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 21:57:06,596 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 445 transitions. [2022-03-18 21:57:06,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-18 21:57:06,596 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:06,596 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:06,596 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-03-18 21:57:06,597 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:06,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:06,597 INFO L85 PathProgramCache]: Analyzing trace with hash 573878194, now seen corresponding path program 1 times [2022-03-18 21:57:06,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:06,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133417590] [2022-03-18 21:57:06,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:06,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:06,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:06,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:06,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,642 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:06,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 21:57:06,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,649 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 21:57:06,649 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:06,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133417590] [2022-03-18 21:57:06,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133417590] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:06,649 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:06,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:06,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209988668] [2022-03-18 21:57:06,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:06,650 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:06,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:06,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:06,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:06,650 INFO L87 Difference]: Start difference. First operand 273 states and 445 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 21:57:06,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:06,894 INFO L93 Difference]: Finished difference Result 321 states and 520 transitions. [2022-03-18 21:57:06,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:06,895 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-18 21:57:06,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:06,897 INFO L225 Difference]: With dead ends: 321 [2022-03-18 21:57:06,897 INFO L226 Difference]: Without dead ends: 319 [2022-03-18 21:57:06,897 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:06,898 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 107 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:06,898 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 66 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:06,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2022-03-18 21:57:06,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 291. [2022-03-18 21:57:06,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 126 states have (on average 1.3571428571428572) internal successors, (171), 142 states have internal predecessors, (171), 152 states have call successors, (152), 13 states have call predecessors, (152), 12 states have return successors, (151), 135 states have call predecessors, (151), 151 states have call successors, (151) [2022-03-18 21:57:06,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 474 transitions. [2022-03-18 21:57:06,934 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 474 transitions. Word has length 32 [2022-03-18 21:57:06,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:06,934 INFO L478 AbstractCegarLoop]: Abstraction has 291 states and 474 transitions. [2022-03-18 21:57:06,934 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 21:57:06,934 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 474 transitions. [2022-03-18 21:57:06,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-18 21:57:06,935 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:06,935 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:06,935 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-03-18 21:57:06,935 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:06,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:06,935 INFO L85 PathProgramCache]: Analyzing trace with hash 630142183, now seen corresponding path program 1 times [2022-03-18 21:57:06,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:06,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594134008] [2022-03-18 21:57:06,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:06,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:06,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:06,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:06,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 21:57:06,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-03-18 21:57:06,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-18 21:57:06,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:06,987 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-18 21:57:06,987 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:06,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594134008] [2022-03-18 21:57:06,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594134008] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:06,988 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:06,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:06,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116096267] [2022-03-18 21:57:06,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:06,988 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:06,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:06,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:06,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:06,989 INFO L87 Difference]: Start difference. First operand 291 states and 474 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-18 21:57:07,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:07,326 INFO L93 Difference]: Finished difference Result 333 states and 531 transitions. [2022-03-18 21:57:07,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:07,340 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 42 [2022-03-18 21:57:07,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:07,341 INFO L225 Difference]: With dead ends: 333 [2022-03-18 21:57:07,341 INFO L226 Difference]: Without dead ends: 331 [2022-03-18 21:57:07,342 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:07,342 INFO L912 BasicCegarLoop]: 52 mSDtfsCounter, 58 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:07,342 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 79 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 352 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 21:57:07,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2022-03-18 21:57:07,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 295. [2022-03-18 21:57:07,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 129 states have (on average 1.3488372093023255) internal successors, (174), 145 states have internal predecessors, (174), 152 states have call successors, (152), 14 states have call predecessors, (152), 13 states have return successors, (151), 135 states have call predecessors, (151), 151 states have call successors, (151) [2022-03-18 21:57:07,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 477 transitions. [2022-03-18 21:57:07,411 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 477 transitions. Word has length 42 [2022-03-18 21:57:07,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:07,412 INFO L478 AbstractCegarLoop]: Abstraction has 295 states and 477 transitions. [2022-03-18 21:57:07,412 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-18 21:57:07,412 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 477 transitions. [2022-03-18 21:57:07,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-18 21:57:07,413 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:07,413 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:07,413 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-03-18 21:57:07,413 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:07,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:07,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1507674262, now seen corresponding path program 1 times [2022-03-18 21:57:07,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:07,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393802735] [2022-03-18 21:57:07,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:07,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:07,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:07,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 21:57:07,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-18 21:57:07,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,539 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-18 21:57:07,540 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:07,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393802735] [2022-03-18 21:57:07,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393802735] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:07,540 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:07,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:07,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086381406] [2022-03-18 21:57:07,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:07,540 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:07,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:07,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:07,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:07,541 INFO L87 Difference]: Start difference. First operand 295 states and 477 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 21:57:07,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:07,762 INFO L93 Difference]: Finished difference Result 301 states and 482 transitions. [2022-03-18 21:57:07,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:07,763 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 42 [2022-03-18 21:57:07,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:07,764 INFO L225 Difference]: With dead ends: 301 [2022-03-18 21:57:07,765 INFO L226 Difference]: Without dead ends: 299 [2022-03-18 21:57:07,765 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:07,765 INFO L912 BasicCegarLoop]: 30 mSDtfsCounter, 52 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:07,765 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 57 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:07,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-03-18 21:57:07,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2022-03-18 21:57:07,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 132 states have (on average 1.3409090909090908) internal successors, (177), 148 states have internal predecessors, (177), 152 states have call successors, (152), 15 states have call predecessors, (152), 14 states have return successors, (151), 135 states have call predecessors, (151), 151 states have call successors, (151) [2022-03-18 21:57:07,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 480 transitions. [2022-03-18 21:57:07,798 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 480 transitions. Word has length 42 [2022-03-18 21:57:07,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:07,798 INFO L478 AbstractCegarLoop]: Abstraction has 299 states and 480 transitions. [2022-03-18 21:57:07,799 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 21:57:07,799 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 480 transitions. [2022-03-18 21:57:07,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-18 21:57:07,799 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:07,799 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:07,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-03-18 21:57:07,800 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:07,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:07,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1060746045, now seen corresponding path program 1 times [2022-03-18 21:57:07,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:07,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67262855] [2022-03-18 21:57:07,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:07,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:07,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:07,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,867 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:07,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:07,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 21:57:07,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-18 21:57:07,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:07,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-03-18 21:57:07,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:07,880 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-03-18 21:57:07,880 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:07,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67262855] [2022-03-18 21:57:07,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67262855] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:07,880 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 21:57:07,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 21:57:07,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295713663] [2022-03-18 21:57:07,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:07,881 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 21:57:07,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:07,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 21:57:07,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 21:57:07,881 INFO L87 Difference]: Start difference. First operand 299 states and 480 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-18 21:57:08,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:08,137 INFO L93 Difference]: Finished difference Result 333 states and 529 transitions. [2022-03-18 21:57:08,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 21:57:08,137 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 54 [2022-03-18 21:57:08,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:08,139 INFO L225 Difference]: With dead ends: 333 [2022-03-18 21:57:08,139 INFO L226 Difference]: Without dead ends: 331 [2022-03-18 21:57:08,139 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-03-18 21:57:08,140 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 78 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:08,140 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 66 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 21:57:08,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2022-03-18 21:57:08,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 178. [2022-03-18 21:57:08,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 86 states have (on average 1.2674418604651163) internal successors, (109), 94 states have internal predecessors, (109), 78 states have call successors, (78), 14 states have call predecessors, (78), 13 states have return successors, (77), 69 states have call predecessors, (77), 77 states have call successors, (77) [2022-03-18 21:57:08,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 264 transitions. [2022-03-18 21:57:08,163 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 264 transitions. Word has length 54 [2022-03-18 21:57:08,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:08,163 INFO L478 AbstractCegarLoop]: Abstraction has 178 states and 264 transitions. [2022-03-18 21:57:08,163 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-18 21:57:08,163 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 264 transitions. [2022-03-18 21:57:08,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-18 21:57:08,164 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:08,164 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:08,164 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-03-18 21:57:08,164 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:08,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:08,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1039189609, now seen corresponding path program 1 times [2022-03-18 21:57:08,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:08,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920720419] [2022-03-18 21:57:08,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:08,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:08,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:08,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:08,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:08,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 21:57:08,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-03-18 21:57:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-18 21:57:08,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-03-18 21:57:08,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,221 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-03-18 21:57:08,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-03-18 21:57:08,224 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:08,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920720419] [2022-03-18 21:57:08,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920720419] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:08,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480948335] [2022-03-18 21:57:08,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:08,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:08,225 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:08,226 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:08,232 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 21:57:08,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:08,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 21:57:08,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:08,494 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2022-03-18 21:57:08,494 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 21:57:08,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480948335] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:08,495 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 21:57:08,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2022-03-18 21:57:08,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947756454] [2022-03-18 21:57:08,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:08,496 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:08,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:08,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:08,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-03-18 21:57:08,496 INFO L87 Difference]: Start difference. First operand 178 states and 264 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-03-18 21:57:08,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:08,663 INFO L93 Difference]: Finished difference Result 509 states and 805 transitions. [2022-03-18 21:57:08,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 21:57:08,664 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2022-03-18 21:57:08,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:08,666 INFO L225 Difference]: With dead ends: 509 [2022-03-18 21:57:08,666 INFO L226 Difference]: Without dead ends: 339 [2022-03-18 21:57:08,667 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-03-18 21:57:08,667 INFO L912 BasicCegarLoop]: 77 mSDtfsCounter, 35 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:08,667 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 279 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:08,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2022-03-18 21:57:08,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 315. [2022-03-18 21:57:08,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 137 states have (on average 1.3430656934306568) internal successors, (184), 153 states have internal predecessors, (184), 164 states have call successors, (164), 14 states have call predecessors, (164), 13 states have return successors, (163), 147 states have call predecessors, (163), 163 states have call successors, (163) [2022-03-18 21:57:08,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 511 transitions. [2022-03-18 21:57:08,740 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 511 transitions. Word has length 62 [2022-03-18 21:57:08,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:08,740 INFO L478 AbstractCegarLoop]: Abstraction has 315 states and 511 transitions. [2022-03-18 21:57:08,740 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-03-18 21:57:08,740 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 511 transitions. [2022-03-18 21:57:08,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-03-18 21:57:08,741 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:08,741 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:08,760 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-18 21:57:08,959 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 21:57:08,959 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:08,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:08,960 INFO L85 PathProgramCache]: Analyzing trace with hash 544844568, now seen corresponding path program 1 times [2022-03-18 21:57:08,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:08,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111564865] [2022-03-18 21:57:08,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:08,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:08,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:09,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:09,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:09,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 21:57:09,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-03-18 21:57:09,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-18 21:57:09,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-03-18 21:57:09,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,049 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2022-03-18 21:57:09,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2022-03-18 21:57:09,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:09,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2022-03-18 21:57:09,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2022-03-18 21:57:09,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,068 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 24 proven. 7 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-03-18 21:57:09,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:09,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111564865] [2022-03-18 21:57:09,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111564865] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:09,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306713387] [2022-03-18 21:57:09,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:09,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:09,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:09,070 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:09,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 21:57:09,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:09,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 21:57:09,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:09,535 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2022-03-18 21:57:09,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 21:57:09,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306713387] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:09,536 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 21:57:09,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 14 [2022-03-18 21:57:09,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882502626] [2022-03-18 21:57:09,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:09,536 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 21:57:09,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:09,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 21:57:09,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:09,537 INFO L87 Difference]: Start difference. First operand 315 states and 511 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2022-03-18 21:57:09,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:09,763 INFO L93 Difference]: Finished difference Result 583 states and 930 transitions. [2022-03-18 21:57:09,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 21:57:09,763 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 84 [2022-03-18 21:57:09,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:09,765 INFO L225 Difference]: With dead ends: 583 [2022-03-18 21:57:09,765 INFO L226 Difference]: Without dead ends: 307 [2022-03-18 21:57:09,766 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2022-03-18 21:57:09,767 INFO L912 BasicCegarLoop]: 90 mSDtfsCounter, 29 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:09,767 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 277 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:09,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2022-03-18 21:57:09,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 271. [2022-03-18 21:57:09,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 125 states have (on average 1.312) internal successors, (164), 137 states have internal predecessors, (164), 132 states have call successors, (132), 14 states have call predecessors, (132), 13 states have return successors, (131), 119 states have call predecessors, (131), 131 states have call successors, (131) [2022-03-18 21:57:09,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 427 transitions. [2022-03-18 21:57:09,854 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 427 transitions. Word has length 84 [2022-03-18 21:57:09,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:09,854 INFO L478 AbstractCegarLoop]: Abstraction has 271 states and 427 transitions. [2022-03-18 21:57:09,855 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2022-03-18 21:57:09,855 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 427 transitions. [2022-03-18 21:57:09,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-03-18 21:57:09,856 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:09,856 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:09,873 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-18 21:57:10,073 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 21:57:10,074 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:10,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:10,074 INFO L85 PathProgramCache]: Analyzing trace with hash 1314014583, now seen corresponding path program 1 times [2022-03-18 21:57:10,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:10,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219013526] [2022-03-18 21:57:10,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:10,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:10,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:10,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:10,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,158 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:10,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 21:57:10,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-03-18 21:57:10,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-18 21:57:10,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:10,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-03-18 21:57:10,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2022-03-18 21:57:10,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2022-03-18 21:57:10,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:10,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2022-03-18 21:57:10,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,200 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2022-03-18 21:57:10,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,203 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 24 proven. 7 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-03-18 21:57:10,203 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:10,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219013526] [2022-03-18 21:57:10,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219013526] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:10,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047676376] [2022-03-18 21:57:10,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:10,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:10,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:10,207 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:10,213 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 21:57:10,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:10,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 21:57:10,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:10,614 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2022-03-18 21:57:10,614 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 21:57:10,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047676376] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 21:57:10,615 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 21:57:10,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2022-03-18 21:57:10,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863566768] [2022-03-18 21:57:10,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 21:57:10,615 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 21:57:10,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:10,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 21:57:10,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-18 21:57:10,616 INFO L87 Difference]: Start difference. First operand 271 states and 427 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2022-03-18 21:57:10,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:10,820 INFO L93 Difference]: Finished difference Result 501 states and 784 transitions. [2022-03-18 21:57:10,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 21:57:10,821 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 84 [2022-03-18 21:57:10,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:10,823 INFO L225 Difference]: With dead ends: 501 [2022-03-18 21:57:10,823 INFO L226 Difference]: Without dead ends: 225 [2022-03-18 21:57:10,824 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-03-18 21:57:10,824 INFO L912 BasicCegarLoop]: 67 mSDtfsCounter, 20 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:10,824 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 218 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 21:57:10,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-03-18 21:57:10,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 214. [2022-03-18 21:57:10,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 100 states have (on average 1.28) internal successors, (128), 110 states have internal predecessors, (128), 100 states have call successors, (100), 14 states have call predecessors, (100), 13 states have return successors, (99), 89 states have call predecessors, (99), 99 states have call successors, (99) [2022-03-18 21:57:10,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 327 transitions. [2022-03-18 21:57:10,862 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 327 transitions. Word has length 84 [2022-03-18 21:57:10,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:10,862 INFO L478 AbstractCegarLoop]: Abstraction has 214 states and 327 transitions. [2022-03-18 21:57:10,862 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2022-03-18 21:57:10,862 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 327 transitions. [2022-03-18 21:57:10,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-18 21:57:10,863 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:10,863 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:10,880 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-03-18 21:57:11,079 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:11,080 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:11,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:11,080 INFO L85 PathProgramCache]: Analyzing trace with hash 1425381294, now seen corresponding path program 1 times [2022-03-18 21:57:11,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:11,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664622446] [2022-03-18 21:57:11,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:11,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:11,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:11,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:11,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:11,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 21:57:11,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,132 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-18 21:57:11,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:11,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,135 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-03-18 21:57:11,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2022-03-18 21:57:11,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2022-03-18 21:57:11,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:11,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2022-03-18 21:57:11,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,144 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2022-03-18 21:57:11,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2022-03-18 21:57:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,148 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 37 proven. 7 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-03-18 21:57:11,148 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:11,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664622446] [2022-03-18 21:57:11,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664622446] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:11,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081052579] [2022-03-18 21:57:11,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:11,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:11,149 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:11,150 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:11,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 21:57:11,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:11,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 21:57:11,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:11,337 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 149 proven. 2 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-03-18 21:57:11,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 21:57:11,519 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 37 proven. 2 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2022-03-18 21:57:11,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081052579] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 21:57:11,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 21:57:11,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 17 [2022-03-18 21:57:11,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440525901] [2022-03-18 21:57:11,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 21:57:11,520 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 21:57:11,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:11,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 21:57:11,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2022-03-18 21:57:11,521 INFO L87 Difference]: Start difference. First operand 214 states and 327 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (36), 4 states have call predecessors, (36), 2 states have return successors, (33), 7 states have call predecessors, (33), 7 states have call successors, (33) [2022-03-18 21:57:13,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:13,210 INFO L93 Difference]: Finished difference Result 495 states and 744 transitions. [2022-03-18 21:57:13,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 21:57:13,211 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (36), 4 states have call predecessors, (36), 2 states have return successors, (33), 7 states have call predecessors, (33), 7 states have call successors, (33) Word has length 89 [2022-03-18 21:57:13,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:13,213 INFO L225 Difference]: With dead ends: 495 [2022-03-18 21:57:13,213 INFO L226 Difference]: Without dead ends: 325 [2022-03-18 21:57:13,214 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=493, Invalid=1399, Unknown=0, NotChecked=0, Total=1892 [2022-03-18 21:57:13,214 INFO L912 BasicCegarLoop]: 113 mSDtfsCounter, 168 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 2092 mSolverCounterSat, 817 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 2909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 817 IncrementalHoareTripleChecker+Valid, 2092 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:13,214 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 170 Invalid, 2909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [817 Valid, 2092 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-18 21:57:13,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2022-03-18 21:57:13,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 245. [2022-03-18 21:57:13,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 122 states have (on average 1.2540983606557377) internal successors, (153), 132 states have internal predecessors, (153), 107 states have call successors, (107), 16 states have call predecessors, (107), 15 states have return successors, (106), 96 states have call predecessors, (106), 106 states have call successors, (106) [2022-03-18 21:57:13,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 366 transitions. [2022-03-18 21:57:13,257 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 366 transitions. Word has length 89 [2022-03-18 21:57:13,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:13,258 INFO L478 AbstractCegarLoop]: Abstraction has 245 states and 366 transitions. [2022-03-18 21:57:13,258 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 15 states have internal predecessors, (58), 7 states have call successors, (36), 4 states have call predecessors, (36), 2 states have return successors, (33), 7 states have call predecessors, (33), 7 states have call successors, (33) [2022-03-18 21:57:13,258 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 366 transitions. [2022-03-18 21:57:13,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-03-18 21:57:13,260 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:13,260 INFO L500 BasicCegarLoop]: trace histogram [18, 17, 17, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:13,277 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-03-18 21:57:13,468 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:13,469 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:13,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:13,469 INFO L85 PathProgramCache]: Analyzing trace with hash -1303481827, now seen corresponding path program 1 times [2022-03-18 21:57:13,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:13,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512034410] [2022-03-18 21:57:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:13,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:13,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:13,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:13,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:13,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 21:57:13,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-18 21:57:13,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:13,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-03-18 21:57:13,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-03-18 21:57:13,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2022-03-18 21:57:13,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2022-03-18 21:57:13,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2022-03-18 21:57:13,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2022-03-18 21:57:13,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2022-03-18 21:57:13,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2022-03-18 21:57:13,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2022-03-18 21:57:13,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,556 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2022-03-18 21:57:13,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107 [2022-03-18 21:57:13,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,559 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 47 proven. 8 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-03-18 21:57:13,559 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:13,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512034410] [2022-03-18 21:57:13,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512034410] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:13,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064833084] [2022-03-18 21:57:13,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:13,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:13,560 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:13,561 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:13,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 21:57:13,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:13,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 21:57:13,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:13,993 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 210 proven. 7 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2022-03-18 21:57:13,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 21:57:14,276 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 47 proven. 8 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-03-18 21:57:14,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064833084] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 21:57:14,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 21:57:14,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 22 [2022-03-18 21:57:14,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263943250] [2022-03-18 21:57:14,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 21:57:14,277 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 21:57:14,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:14,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 21:57:14,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2022-03-18 21:57:14,278 INFO L87 Difference]: Start difference. First operand 245 states and 366 transitions. Second operand has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 13 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 13 states have call predecessors, (47), 13 states have call successors, (47) [2022-03-18 21:57:18,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:18,235 INFO L93 Difference]: Finished difference Result 899 states and 1410 transitions. [2022-03-18 21:57:18,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-18 21:57:18,236 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 13 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 13 states have call predecessors, (47), 13 states have call successors, (47) Word has length 116 [2022-03-18 21:57:18,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:18,238 INFO L225 Difference]: With dead ends: 899 [2022-03-18 21:57:18,238 INFO L226 Difference]: Without dead ends: 517 [2022-03-18 21:57:18,243 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2059 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1625, Invalid=5181, Unknown=0, NotChecked=0, Total=6806 [2022-03-18 21:57:18,243 INFO L912 BasicCegarLoop]: 114 mSDtfsCounter, 403 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 3739 mSolverCounterSat, 1435 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 5174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1435 IncrementalHoareTripleChecker+Valid, 3739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:18,244 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 176 Invalid, 5174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1435 Valid, 3739 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-03-18 21:57:18,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2022-03-18 21:57:18,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 374. [2022-03-18 21:57:18,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 171 states have (on average 1.263157894736842) internal successors, (216), 185 states have internal predecessors, (216), 188 states have call successors, (188), 15 states have call predecessors, (188), 14 states have return successors, (187), 173 states have call predecessors, (187), 187 states have call successors, (187) [2022-03-18 21:57:18,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 591 transitions. [2022-03-18 21:57:18,315 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 591 transitions. Word has length 116 [2022-03-18 21:57:18,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:18,316 INFO L478 AbstractCegarLoop]: Abstraction has 374 states and 591 transitions. [2022-03-18 21:57:18,316 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 13 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 13 states have call predecessors, (47), 13 states have call successors, (47) [2022-03-18 21:57:18,316 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 591 transitions. [2022-03-18 21:57:18,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-03-18 21:57:18,317 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:18,317 INFO L500 BasicCegarLoop]: trace histogram [18, 17, 17, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:18,349 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 21:57:18,531 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:18,532 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:18,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:18,532 INFO L85 PathProgramCache]: Analyzing trace with hash -673023202, now seen corresponding path program 1 times [2022-03-18 21:57:18,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:18,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815796170] [2022-03-18 21:57:18,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:18,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:18,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:18,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:18,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 21:57:18,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-18 21:57:18,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:18,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-03-18 21:57:18,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-03-18 21:57:18,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2022-03-18 21:57:18,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:18,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2022-03-18 21:57:18,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2022-03-18 21:57:18,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2022-03-18 21:57:18,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2022-03-18 21:57:18,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2022-03-18 21:57:18,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2022-03-18 21:57:18,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2022-03-18 21:57:18,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107 [2022-03-18 21:57:18,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,693 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 34 proven. 21 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-03-18 21:57:18,693 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:18,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815796170] [2022-03-18 21:57:18,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815796170] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:18,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384474707] [2022-03-18 21:57:18,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:18,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:18,694 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:18,696 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:18,765 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 21:57:18,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:18,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 21:57:18,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:19,101 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 34 proven. 21 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-03-18 21:57:19,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 21:57:19,404 INFO L134 CoverageAnalysis]: Checked inductivity of 599 backedges. 34 proven. 21 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-03-18 21:57:19,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384474707] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 21:57:19,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 21:57:19,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 21 [2022-03-18 21:57:19,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18909490] [2022-03-18 21:57:19,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 21:57:19,405 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-18 21:57:19,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:19,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-18 21:57:19,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2022-03-18 21:57:19,406 INFO L87 Difference]: Start difference. First operand 374 states and 591 transitions. Second operand has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (53), 4 states have call predecessors, (53), 1 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) [2022-03-18 21:57:21,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:21,712 INFO L93 Difference]: Finished difference Result 909 states and 1444 transitions. [2022-03-18 21:57:21,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-18 21:57:21,712 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (53), 4 states have call predecessors, (53), 1 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) Word has length 116 [2022-03-18 21:57:21,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:21,716 INFO L225 Difference]: With dead ends: 909 [2022-03-18 21:57:21,716 INFO L226 Difference]: Without dead ends: 786 [2022-03-18 21:57:21,717 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 257 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=509, Invalid=1653, Unknown=0, NotChecked=0, Total=2162 [2022-03-18 21:57:21,718 INFO L912 BasicCegarLoop]: 62 mSDtfsCounter, 370 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2419 mSolverCounterSat, 1211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 3630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1211 IncrementalHoareTripleChecker+Valid, 2419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:21,718 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 134 Invalid, 3630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1211 Valid, 2419 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-18 21:57:21,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 786 states. [2022-03-18 21:57:21,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 786 to 418. [2022-03-18 21:57:21,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 186 states have (on average 1.2741935483870968) internal successors, (237), 208 states have internal predecessors, (237), 214 states have call successors, (214), 18 states have call predecessors, (214), 17 states have return successors, (213), 191 states have call predecessors, (213), 213 states have call successors, (213) [2022-03-18 21:57:21,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 664 transitions. [2022-03-18 21:57:21,808 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 664 transitions. Word has length 116 [2022-03-18 21:57:21,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:21,808 INFO L478 AbstractCegarLoop]: Abstraction has 418 states and 664 transitions. [2022-03-18 21:57:21,808 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (53), 4 states have call predecessors, (53), 1 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) [2022-03-18 21:57:21,808 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 664 transitions. [2022-03-18 21:57:21,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2022-03-18 21:57:21,810 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 21:57:21,810 INFO L500 BasicCegarLoop]: trace histogram [32, 31, 31, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 21:57:21,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 21:57:22,028 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:22,028 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 21:57:22,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 21:57:22,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1294944744, now seen corresponding path program 2 times [2022-03-18 21:57:22,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 21:57:22,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264937795] [2022-03-18 21:57:22,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 21:57:22,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 21:57:22,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 21:57:22,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-18 21:57:22,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 21:57:22,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 21:57:22,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-03-18 21:57:22,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-18 21:57:22,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-18 21:57:22,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,176 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-03-18 21:57:22,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-03-18 21:57:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2022-03-18 21:57:22,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2022-03-18 21:57:22,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2022-03-18 21:57:22,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2022-03-18 21:57:22,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2022-03-18 21:57:22,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2022-03-18 21:57:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2022-03-18 21:57:22,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99 [2022-03-18 21:57:22,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2022-03-18 21:57:22,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2022-03-18 21:57:22,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2022-03-18 21:57:22,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 122 [2022-03-18 21:57:22,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 127 [2022-03-18 21:57:22,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 132 [2022-03-18 21:57:22,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 139 [2022-03-18 21:57:22,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 144 [2022-03-18 21:57:22,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2022-03-18 21:57:22,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 156 [2022-03-18 21:57:22,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161 [2022-03-18 21:57:22,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 166 [2022-03-18 21:57:22,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 174 [2022-03-18 21:57:22,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179 [2022-03-18 21:57:22,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 186 [2022-03-18 21:57:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 21:57:22,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1986 backedges. 62 proven. 47 refuted. 0 times theorem prover too weak. 1877 trivial. 0 not checked. [2022-03-18 21:57:22,262 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 21:57:22,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264937795] [2022-03-18 21:57:22,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264937795] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 21:57:22,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474459835] [2022-03-18 21:57:22,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 21:57:22,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:22,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 21:57:22,263 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 21:57:22,265 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 21:57:22,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 21:57:22,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 21:57:22,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 21:57:22,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 21:57:23,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1986 backedges. 430 proven. 26 refuted. 0 times theorem prover too weak. 1530 trivial. 0 not checked. [2022-03-18 21:57:23,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 21:57:23,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1986 backedges. 81 proven. 45 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2022-03-18 21:57:23,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474459835] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 21:57:23,647 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 21:57:23,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 27 [2022-03-18 21:57:23,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366966196] [2022-03-18 21:57:23,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 21:57:23,650 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-18 21:57:23,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 21:57:23,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-18 21:57:23,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=611, Unknown=0, NotChecked=0, Total=702 [2022-03-18 21:57:23,651 INFO L87 Difference]: Start difference. First operand 418 states and 664 transitions. Second operand has 27 states, 27 states have (on average 3.5185185185185186) internal successors, (95), 25 states have internal predecessors, (95), 15 states have call successors, (88), 4 states have call predecessors, (88), 2 states have return successors, (84), 15 states have call predecessors, (84), 15 states have call successors, (84) [2022-03-18 21:57:34,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 21:57:34,129 INFO L93 Difference]: Finished difference Result 1823 states and 2985 transitions. [2022-03-18 21:57:34,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-03-18 21:57:34,129 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.5185185185185186) internal successors, (95), 25 states have internal predecessors, (95), 15 states have call successors, (88), 4 states have call predecessors, (88), 2 states have return successors, (84), 15 states have call predecessors, (84), 15 states have call successors, (84) Word has length 195 [2022-03-18 21:57:34,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 21:57:34,130 INFO L225 Difference]: With dead ends: 1823 [2022-03-18 21:57:34,130 INFO L226 Difference]: Without dead ends: 0 [2022-03-18 21:57:34,141 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7177 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3750, Invalid=16842, Unknown=0, NotChecked=0, Total=20592 [2022-03-18 21:57:34,141 INFO L912 BasicCegarLoop]: 120 mSDtfsCounter, 729 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 7215 mSolverCounterSat, 3484 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 729 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 10699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3484 IncrementalHoareTripleChecker+Valid, 7215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-03-18 21:57:34,141 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [729 Valid, 212 Invalid, 10699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3484 Valid, 7215 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-03-18 21:57:34,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-18 21:57:34,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-18 21:57:34,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-18 21:57:34,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-18 21:57:34,143 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 195 [2022-03-18 21:57:34,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 21:57:34,143 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-18 21:57:34,143 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.5185185185185186) internal successors, (95), 25 states have internal predecessors, (95), 15 states have call successors, (88), 4 states have call predecessors, (88), 2 states have return successors, (84), 15 states have call predecessors, (84), 15 states have call successors, (84) [2022-03-18 21:57:34,143 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-18 21:57:34,143 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-18 21:57:34,145 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-18 21:57:34,177 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-18 21:57:34,363 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 21:57:34,365 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-18 21:57:47,648 WARN L232 SmtUtils]: Spent 12.40s on a formula simplification. DAG size of input: 380 DAG size of output: 381 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or)