/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/nla-digbench-scaling/hard-u_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-05 08:10:10,724 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 08:10:10,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 08:10:10,781 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-05 08:10:10,782 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-05 08:10:10,783 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-05 08:10:10,785 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-05 08:10:10,788 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-05 08:10:10,789 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-05 08:10:10,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-05 08:10:10,795 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-05 08:10:10,795 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-05 08:10:10,796 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-05 08:10:10,796 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-05 08:10:10,797 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-05 08:10:10,798 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-05 08:10:10,798 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-05 08:10:10,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-05 08:10:10,800 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-05 08:10:10,801 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-05 08:10:10,802 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-05 08:10:10,808 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-05 08:10:10,809 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-05 08:10:10,812 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-05 08:10:10,813 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-05 08:10:10,823 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-05 08:10:10,823 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-05 08:10:10,823 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-05 08:10:10,824 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-05 08:10:10,824 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-05 08:10:10,825 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-05 08:10:10,825 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-05 08:10:10,825 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-05 08:10:10,826 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-05 08:10:10,826 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-05 08:10:10,827 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-05 08:10:10,827 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-05 08:10:10,828 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-05 08:10:10,828 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-05 08:10:10,828 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-05 08:10:10,829 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-05 08:10:10,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-05 08:10:10,834 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-05 08:10:10,855 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 08:10:10,856 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 08:10:10,856 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-05 08:10:10,857 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-05 08:10:10,857 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-05 08:10:10,858 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-05 08:10:10,858 INFO L138 SettingsManager]: * Use SBE=true [2022-04-05 08:10:10,858 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 08:10:10,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 08:10:10,859 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 08:10:10,859 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 08:10:10,859 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 08:10:10,859 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 08:10:10,859 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 08:10:10,860 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 08:10:10,860 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 08:10:10,860 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 08:10:10,860 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 08:10:10,860 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 08:10:10,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 08:10:10,860 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 08:10:10,861 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-05 08:10:10,861 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-05 08:10:10,861 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 08:10:10,861 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-05 08:10:10,861 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-05 08:10:10,862 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-05 08:10:10,862 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-05 08:10:10,863 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-05 08:10:10,863 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 08:10:11,104 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 08:10:11,130 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 08:10:11,132 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 08:10:11,132 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 08:10:11,133 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 08:10:11,134 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound50.c [2022-04-05 08:10:11,184 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/663208e37/99e736447fd94b3eb5a3922a78aca17d/FLAG66dec14b0 [2022-04-05 08:10:11,560 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 08:10:11,560 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound50.c [2022-04-05 08:10:11,565 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/663208e37/99e736447fd94b3eb5a3922a78aca17d/FLAG66dec14b0 [2022-04-05 08:10:11,984 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/663208e37/99e736447fd94b3eb5a3922a78aca17d [2022-04-05 08:10:11,986 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 08:10:11,989 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-05 08:10:11,991 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 08:10:11,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 08:10:11,994 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 08:10:11,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 08:10:11" (1/1) ... [2022-04-05 08:10:11,996 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12938633 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:11, skipping insertion in model container [2022-04-05 08:10:11,996 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 08:10:11" (1/1) ... [2022-04-05 08:10:12,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 08:10:12,015 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 08:10:12,180 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound50.c[537,550] [2022-04-05 08:10:12,203 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 08:10:12,214 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 08:10:12,228 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound50.c[537,550] [2022-04-05 08:10:12,241 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 08:10:12,255 INFO L208 MainTranslator]: Completed translation [2022-04-05 08:10:12,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12 WrapperNode [2022-04-05 08:10:12,257 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 08:10:12,258 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 08:10:12,258 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 08:10:12,258 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 08:10:12,267 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,268 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,279 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,279 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,289 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,294 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 08:10:12,295 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 08:10:12,295 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 08:10:12,295 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 08:10:12,297 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 08:10:12,319 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:12,332 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) [2022-04-05 08:10:12,358 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 [2022-04-05 08:10:12,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 08:10:12,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 08:10:12,372 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 08:10:12,372 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-05 08:10:12,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 08:10:12,372 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 08:10:12,372 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 08:10:12,373 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 08:10:12,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 08:10:12,375 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 08:10:12,375 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 08:10:12,375 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 08:10:12,433 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 08:10:12,435 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 08:10:12,588 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 08:10:12,593 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 08:10:12,593 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-05 08:10:12,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 08:10:12 BoogieIcfgContainer [2022-04-05 08:10:12,595 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 08:10:12,596 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-05 08:10:12,596 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-05 08:10:12,612 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-05 08:10:12,614 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 08:10:12" (1/1) ... [2022-04-05 08:10:12,616 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-05 08:10:12,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 08:10:12 BasicIcfg [2022-04-05 08:10:12,638 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-05 08:10:12,640 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 08:10:12,640 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 08:10:12,652 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 08:10:12,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 08:10:11" (1/4) ... [2022-04-05 08:10:12,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35eefda6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 08:10:12, skipping insertion in model container [2022-04-05 08:10:12,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 08:10:12" (2/4) ... [2022-04-05 08:10:12,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35eefda6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 08:10:12, skipping insertion in model container [2022-04-05 08:10:12,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 08:10:12" (3/4) ... [2022-04-05 08:10:12,654 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35eefda6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 08:10:12, skipping insertion in model container [2022-04-05 08:10:12,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 08:10:12" (4/4) ... [2022-04-05 08:10:12,655 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound50.cqvasr [2022-04-05 08:10:12,660 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-05 08:10:12,661 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 08:10:12,692 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 08:10:12,697 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 [2022-04-05 08:10:12,697 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 08:10:12,714 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-05 08:10:12,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-05 08:10:12,718 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:12,719 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 08:10:12,719 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:12,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:12,723 INFO L85 PathProgramCache]: Analyzing trace with hash 79654685, now seen corresponding path program 1 times [2022-04-05 08:10:12,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:12,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651586390] [2022-04-05 08:10:12,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:12,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:12,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:12,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 08:10:12,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:12,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-05 08:10:12,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:12,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 08:10:12,927 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:12,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651586390] [2022-04-05 08:10:12,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651586390] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:12,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:12,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-05 08:10:12,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230083949] [2022-04-05 08:10:12,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:12,935 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-05 08:10:12,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:12,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-05 08:10:12,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 08:10:12,962 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-05 08:10:13,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:13,068 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2022-04-05 08:10:13,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-05 08:10:13,070 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-04-05 08:10:13,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:13,080 INFO L225 Difference]: With dead ends: 66 [2022-04-05 08:10:13,080 INFO L226 Difference]: Without dead ends: 33 [2022-04-05 08:10:13,084 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 08:10:13,087 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:13,089 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 08:10:13,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-05 08:10:13,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-04-05 08:10:13,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-05 08:10:13,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-04-05 08:10:13,125 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2022-04-05 08:10:13,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:13,125 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-04-05 08:10:13,125 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-05 08:10:13,126 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-04-05 08:10:13,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-05 08:10:13,127 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:13,127 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 08:10:13,128 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 08:10:13,128 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:13,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:13,129 INFO L85 PathProgramCache]: Analyzing trace with hash -85369733, now seen corresponding path program 1 times [2022-04-05 08:10:13,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:13,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003944656] [2022-04-05 08:10:13,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:13,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:13,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:13,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 08:10:13,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:13,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-05 08:10:13,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:13,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 08:10:13,290 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:13,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003944656] [2022-04-05 08:10:13,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003944656] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:13,291 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:13,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-05 08:10:13,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446919120] [2022-04-05 08:10:13,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:13,292 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-05 08:10:13,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:13,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-05 08:10:13,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-05 08:10:13,293 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-05 08:10:13,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:13,457 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-04-05 08:10:13,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-05 08:10:13,457 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-04-05 08:10:13,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:13,459 INFO L225 Difference]: With dead ends: 47 [2022-04-05 08:10:13,459 INFO L226 Difference]: Without dead ends: 45 [2022-04-05 08:10:13,459 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-05 08:10:13,460 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 28 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:13,461 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 90 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 08:10:13,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-04-05 08:10:13,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2022-04-05 08:10:13,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-05 08:10:13,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2022-04-05 08:10:13,470 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2022-04-05 08:10:13,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:13,470 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2022-04-05 08:10:13,470 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-05 08:10:13,471 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2022-04-05 08:10:13,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-04-05 08:10:13,471 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:13,471 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 08:10:13,472 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 08:10:13,472 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:13,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:13,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1527809342, now seen corresponding path program 1 times [2022-04-05 08:10:13,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:13,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765442279] [2022-04-05 08:10:13,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:13,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:13,484 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:13,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [476359199] [2022-04-05 08:10:13,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:13,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:13,485 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:13,487 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) [2022-04-05 08:10:13,510 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-05 08:10:13,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:13,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-05 08:10:13,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:13,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 08:10:13,680 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 08:10:13,681 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:13,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765442279] [2022-04-05 08:10:13,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:13,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476359199] [2022-04-05 08:10:13,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476359199] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:13,681 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:13,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 08:10:13,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343707474] [2022-04-05 08:10:13,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:13,682 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 08:10:13,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:13,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 08:10:13,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 08:10:13,683 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 08:10:13,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:13,695 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2022-04-05 08:10:13,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 08:10:13,695 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-04-05 08:10:13,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:13,696 INFO L225 Difference]: With dead ends: 52 [2022-04-05 08:10:13,696 INFO L226 Difference]: Without dead ends: 38 [2022-04-05 08:10:13,696 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 08:10:13,697 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:13,698 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 08:10:13,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-04-05 08:10:13,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-04-05 08:10:13,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-05 08:10:13,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2022-04-05 08:10:13,704 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2022-04-05 08:10:13,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:13,704 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2022-04-05 08:10:13,705 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 08:10:13,705 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2022-04-05 08:10:13,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-05 08:10:13,705 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:13,705 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 08:10:13,732 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:13,927 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:13,928 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:13,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:13,928 INFO L85 PathProgramCache]: Analyzing trace with hash 2128444854, now seen corresponding path program 1 times [2022-04-05 08:10:13,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:13,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678218726] [2022-04-05 08:10:13,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:13,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:13,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:14,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 08:10:14,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:14,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-05 08:10:14,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:14,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-04-05 08:10:14,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:14,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 08:10:14,051 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:14,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678218726] [2022-04-05 08:10:14,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678218726] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:14,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:14,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-05 08:10:14,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093481248] [2022-04-05 08:10:14,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:14,052 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-05 08:10:14,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:14,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-05 08:10:14,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-05 08:10:14,053 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-04-05 08:10:14,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:14,211 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2022-04-05 08:10:14,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-05 08:10:14,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 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 23 [2022-04-05 08:10:14,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:14,215 INFO L225 Difference]: With dead ends: 52 [2022-04-05 08:10:14,215 INFO L226 Difference]: Without dead ends: 50 [2022-04-05 08:10:14,216 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-05 08:10:14,224 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 23 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:14,226 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 83 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 08:10:14,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-05 08:10:14,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2022-04-05 08:10:14,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-05 08:10:14,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-04-05 08:10:14,234 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2022-04-05 08:10:14,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:14,235 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-04-05 08:10:14,235 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-04-05 08:10:14,239 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-04-05 08:10:14,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-05 08:10:14,240 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:14,241 INFO L499 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, 1] [2022-04-05 08:10:14,241 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-04-05 08:10:14,241 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:14,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:14,241 INFO L85 PathProgramCache]: Analyzing trace with hash 135546551, now seen corresponding path program 1 times [2022-04-05 08:10:14,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:14,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272671750] [2022-04-05 08:10:14,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:14,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:14,258 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:14,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [804693494] [2022-04-05 08:10:14,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:14,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:14,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:14,272 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) [2022-04-05 08:10:14,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-05 08:10:14,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:14,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-05 08:10:14,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:14,414 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 08:10:14,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 08:10:14,415 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:14,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272671750] [2022-04-05 08:10:14,415 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:14,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804693494] [2022-04-05 08:10:14,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804693494] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:14,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:14,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 08:10:14,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621522993] [2022-04-05 08:10:14,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:14,416 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 08:10:14,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:14,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 08:10:14,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-05 08:10:14,417 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-05 08:10:16,468 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-05 08:10:16,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:16,637 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2022-04-05 08:10:16,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 08:10:16,637 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 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 28 [2022-04-05 08:10:16,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:16,638 INFO L225 Difference]: With dead ends: 59 [2022-04-05 08:10:16,638 INFO L226 Difference]: Without dead ends: 56 [2022-04-05 08:10:16,639 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-05 08:10:16,639 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 10 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:16,640 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 140 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2022-04-05 08:10:16,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-04-05 08:10:16,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-04-05 08:10:16,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 35 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-05 08:10:16,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2022-04-05 08:10:16,655 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 28 [2022-04-05 08:10:16,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:16,655 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2022-04-05 08:10:16,655 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-05 08:10:16,655 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2022-04-05 08:10:16,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-04-05 08:10:16,656 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:16,656 INFO L499 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, 1, 1, 1, 1] [2022-04-05 08:10:16,691 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:16,888 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:16,888 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:16,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:16,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1016025214, now seen corresponding path program 1 times [2022-04-05 08:10:16,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:16,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777449457] [2022-04-05 08:10:16,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:16,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:16,901 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:16,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1420692949] [2022-04-05 08:10:16,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:16,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:16,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:16,907 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) [2022-04-05 08:10:16,908 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-05 08:10:16,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:16,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-05 08:10:16,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:17,066 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-05 08:10:17,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 08:10:17,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:17,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777449457] [2022-04-05 08:10:17,067 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:17,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420692949] [2022-04-05 08:10:17,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420692949] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:17,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:17,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 08:10:17,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134491544] [2022-04-05 08:10:17,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:17,068 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 08:10:17,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:17,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 08:10:17,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-05 08:10:17,069 INFO L87 Difference]: Start difference. First operand 56 states and 71 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-05 08:10:17,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:17,118 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2022-04-05 08:10:17,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 08:10:17,118 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2022-04-05 08:10:17,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:17,119 INFO L225 Difference]: With dead ends: 76 [2022-04-05 08:10:17,119 INFO L226 Difference]: Without dead ends: 69 [2022-04-05 08:10:17,120 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-05 08:10:17,120 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:17,120 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 117 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 08:10:17,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-04-05 08:10:17,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2022-04-05 08:10:17,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-05 08:10:17,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2022-04-05 08:10:17,129 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 36 [2022-04-05 08:10:17,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:17,130 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2022-04-05 08:10:17,130 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-05 08:10:17,130 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2022-04-05 08:10:17,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-04-05 08:10:17,131 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:17,131 INFO L499 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, 1, 1, 1, 1] [2022-04-05 08:10:17,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:17,331 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:17,332 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:17,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:17,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1017127481, now seen corresponding path program 1 times [2022-04-05 08:10:17,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:17,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948533345] [2022-04-05 08:10:17,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:17,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:17,342 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:17,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1408566857] [2022-04-05 08:10:17,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:17,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:17,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:17,347 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) [2022-04-05 08:10:17,354 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-05 08:10:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:17,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2022-04-05 08:10:17,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:17,610 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-05 08:10:17,610 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 08:10:17,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:17,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948533345] [2022-04-05 08:10:17,612 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:17,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408566857] [2022-04-05 08:10:17,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408566857] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 08:10:17,612 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 08:10:17,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-05 08:10:17,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514039684] [2022-04-05 08:10:17,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:17,613 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-05 08:10:17,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:17,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-05 08:10:17,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-05 08:10:17,614 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-05 08:10:19,764 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-05 08:10:19,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:19,889 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2022-04-05 08:10:19,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-05 08:10:19,890 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), 3 states have call successors, (7), 2 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 36 [2022-04-05 08:10:19,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:19,891 INFO L225 Difference]: With dead ends: 74 [2022-04-05 08:10:19,891 INFO L226 Difference]: Without dead ends: 71 [2022-04-05 08:10:19,891 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-05 08:10:19,892 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 10 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:19,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 156 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 70 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2022-04-05 08:10:19,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-04-05 08:10:19,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-04-05 08:10:19,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 46 states have internal predecessors, (52), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-05 08:10:19,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2022-04-05 08:10:19,903 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 36 [2022-04-05 08:10:19,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:19,904 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2022-04-05 08:10:19,904 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), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-05 08:10:19,904 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2022-04-05 08:10:19,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-04-05 08:10:19,905 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:19,905 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2022-04-05 08:10:19,923 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:20,105 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:20,106 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:20,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:20,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1880362404, now seen corresponding path program 1 times [2022-04-05 08:10:20,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:20,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428057540] [2022-04-05 08:10:20,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:20,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:20,115 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:20,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1089431385] [2022-04-05 08:10:20,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:20,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:20,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:20,116 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) [2022-04-05 08:10:20,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-05 08:10:20,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:20,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-05 08:10:20,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:20,288 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-05 08:10:20,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 08:10:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-05 08:10:20,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:20,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428057540] [2022-04-05 08:10:20,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:20,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089431385] [2022-04-05 08:10:20,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089431385] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 08:10:20,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-05 08:10:20,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-04-05 08:10:20,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266298344] [2022-04-05 08:10:20,426 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-04-05 08:10:20,426 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-05 08:10:20,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:20,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-05 08:10:20,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-04-05 08:10:20,427 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2022-04-05 08:10:20,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:20,558 INFO L93 Difference]: Finished difference Result 137 states and 163 transitions. [2022-04-05 08:10:20,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-05 08:10:20,558 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 38 [2022-04-05 08:10:20,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:20,560 INFO L225 Difference]: With dead ends: 137 [2022-04-05 08:10:20,560 INFO L226 Difference]: Without dead ends: 123 [2022-04-05 08:10:20,560 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-04-05 08:10:20,561 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 67 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:20,561 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 224 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 08:10:20,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-04-05 08:10:20,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2022-04-05 08:10:20,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 75 states have (on average 1.1866666666666668) internal successors, (89), 77 states have internal predecessors, (89), 25 states have call successors, (25), 17 states have call predecessors, (25), 16 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-04-05 08:10:20,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 136 transitions. [2022-04-05 08:10:20,577 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 136 transitions. Word has length 38 [2022-04-05 08:10:20,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:20,577 INFO L478 AbstractCegarLoop]: Abstraction has 117 states and 136 transitions. [2022-04-05 08:10:20,578 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2022-04-05 08:10:20,578 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 136 transitions. [2022-04-05 08:10:20,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-05 08:10:20,579 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:20,579 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 08:10:20,604 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:20,801 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:20,801 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:20,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:20,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1525733273, now seen corresponding path program 1 times [2022-04-05 08:10:20,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:20,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579747512] [2022-04-05 08:10:20,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:20,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:20,810 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:20,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1020439926] [2022-04-05 08:10:20,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:20,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:20,811 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:20,811 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) [2022-04-05 08:10:20,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-05 08:10:20,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:20,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjunts are in the unsatisfiable core [2022-04-05 08:10:20,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:21,275 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-05 08:10:21,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 08:10:21,469 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-05 08:10:21,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:21,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579747512] [2022-04-05 08:10:21,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:21,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020439926] [2022-04-05 08:10:21,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020439926] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-05 08:10:21,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-05 08:10:21,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-04-05 08:10:21,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596989373] [2022-04-05 08:10:21,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 08:10:21,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-05 08:10:21,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:21,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-05 08:10:21,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-04-05 08:10:21,471 INFO L87 Difference]: Start difference. First operand 117 states and 136 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-04-05 08:10:23,515 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-05 08:10:25,578 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-05 08:10:27,709 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-05 08:10:29,846 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-05 08:10:30,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:30,022 INFO L93 Difference]: Finished difference Result 141 states and 169 transitions. [2022-04-05 08:10:30,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 08:10:30,023 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), 3 states have call successors, (9), 2 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 46 [2022-04-05 08:10:30,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:30,025 INFO L225 Difference]: With dead ends: 141 [2022-04-05 08:10:30,025 INFO L226 Difference]: Without dead ends: 139 [2022-04-05 08:10:30,025 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-05 08:10:30,026 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 17 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 5 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:30,026 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 132 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 49 Invalid, 4 Unknown, 0 Unchecked, 8.5s Time] [2022-04-05 08:10:30,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-04-05 08:10:30,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2022-04-05 08:10:30,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 85 states have (on average 1.1764705882352942) internal successors, (100), 89 states have internal predecessors, (100), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2022-04-05 08:10:30,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 155 transitions. [2022-04-05 08:10:30,041 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 155 transitions. Word has length 46 [2022-04-05 08:10:30,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:30,042 INFO L478 AbstractCegarLoop]: Abstraction has 133 states and 155 transitions. [2022-04-05 08:10:30,042 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), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-04-05 08:10:30,042 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 155 transitions. [2022-04-05 08:10:30,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-05 08:10:30,043 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:30,043 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 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] [2022-04-05 08:10:30,059 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:30,248 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:30,249 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:30,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:30,249 INFO L85 PathProgramCache]: Analyzing trace with hash 450187565, now seen corresponding path program 1 times [2022-04-05 08:10:30,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:30,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53779216] [2022-04-05 08:10:30,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:30,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:30,258 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:30,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [876748954] [2022-04-05 08:10:30,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:30,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:30,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:30,260 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) [2022-04-05 08:10:30,279 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-05 08:10:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 08:10:30,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-05 08:10:30,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 08:10:30,446 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 08:10:30,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 08:10:30,578 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-05 08:10:30,578 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 08:10:30,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53779216] [2022-04-05 08:10:30,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-05 08:10:30,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876748954] [2022-04-05 08:10:30,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876748954] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 08:10:30,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-05 08:10:30,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-05 08:10:30,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187587263] [2022-04-05 08:10:30,579 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-04-05 08:10:30,579 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-05 08:10:30,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 08:10:30,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-05 08:10:30,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-05 08:10:30,580 INFO L87 Difference]: Start difference. First operand 133 states and 155 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-04-05 08:10:30,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 08:10:30,808 INFO L93 Difference]: Finished difference Result 225 states and 269 transitions. [2022-04-05 08:10:30,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-05 08:10:30,808 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 50 [2022-04-05 08:10:30,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 08:10:30,811 INFO L225 Difference]: With dead ends: 225 [2022-04-05 08:10:30,811 INFO L226 Difference]: Without dead ends: 211 [2022-04-05 08:10:30,811 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-04-05 08:10:30,812 INFO L913 BasicCegarLoop]: 68 mSDtfsCounter, 152 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 08:10:30,812 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 223 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 08:10:30,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-04-05 08:10:30,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 204. [2022-04-05 08:10:30,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 130 states have (on average 1.176923076923077) internal successors, (153), 138 states have internal predecessors, (153), 47 states have call successors, (47), 27 states have call predecessors, (47), 26 states have return successors, (42), 38 states have call predecessors, (42), 42 states have call successors, (42) [2022-04-05 08:10:30,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 242 transitions. [2022-04-05 08:10:30,830 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 242 transitions. Word has length 50 [2022-04-05 08:10:30,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 08:10:30,831 INFO L478 AbstractCegarLoop]: Abstraction has 204 states and 242 transitions. [2022-04-05 08:10:30,831 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-04-05 08:10:30,831 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 242 transitions. [2022-04-05 08:10:30,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-05 08:10:30,832 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 08:10:30,832 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 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] [2022-04-05 08:10:30,857 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-05 08:10:31,054 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:31,055 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 08:10:31,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 08:10:31,055 INFO L85 PathProgramCache]: Analyzing trace with hash 451289832, now seen corresponding path program 1 times [2022-04-05 08:10:31,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 08:10:31,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364663297] [2022-04-05 08:10:31,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:31,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 08:10:31,074 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-05 08:10:31,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [349026572] [2022-04-05 08:10:31,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 08:10:31,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 08:10:31,074 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 08:10:31,076 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 08:10:31,105 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process