/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/loops/invert_string-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-05 04:49:16,203 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 04:49:16,205 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 04:49:16,230 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-05 04:49:16,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-05 04:49:16,232 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-05 04:49:16,233 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-05 04:49:16,235 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-05 04:49:16,236 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-05 04:49:16,237 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-05 04:49:16,238 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-05 04:49:16,240 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-05 04:49:16,240 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-05 04:49:16,241 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-05 04:49:16,242 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-05 04:49:16,243 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-05 04:49:16,244 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-05 04:49:16,245 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-05 04:49:16,246 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-05 04:49:16,248 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-05 04:49:16,249 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-05 04:49:16,250 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-05 04:49:16,251 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-05 04:49:16,252 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-05 04:49:16,252 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-05 04:49:16,255 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-05 04:49:16,255 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-05 04:49:16,256 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-05 04:49:16,256 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-05 04:49:16,257 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-05 04:49:16,258 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-05 04:49:16,258 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-05 04:49:16,259 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-05 04:49:16,259 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-05 04:49:16,260 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-05 04:49:16,261 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-05 04:49:16,261 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-05 04:49:16,262 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-05 04:49:16,262 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-05 04:49:16,262 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-05 04:49:16,263 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-05 04:49:16,264 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-05 04:49:16,265 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 04:49:16,290 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 04:49:16,290 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 04:49:16,291 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-05 04:49:16,291 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-05 04:49:16,292 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-05 04:49:16,292 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-05 04:49:16,292 INFO L138 SettingsManager]: * Use SBE=true [2022-04-05 04:49:16,292 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 04:49:16,293 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 04:49:16,294 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 04:49:16,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 04:49:16,294 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 04:49:16,294 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 04:49:16,294 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 04:49:16,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 04:49:16,295 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 04:49:16,298 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-05 04:49:16,299 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-05 04:49:16,299 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 04:49:16,299 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-05 04:49:16,299 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-05 04:49:16,299 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-05 04:49:16,300 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-05 04:49:16,301 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-05 04:49:16,301 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 04:49:16,606 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 04:49:16,649 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 04:49:16,652 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 04:49:16,653 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 04:49:16,653 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 04:49:16,655 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-3.c [2022-04-05 04:49:16,758 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e244568/ea14ace128b24511b6fbe61515838d1c/FLAG659808b0d [2022-04-05 04:49:17,314 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 04:49:17,314 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c [2022-04-05 04:49:17,319 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e244568/ea14ace128b24511b6fbe61515838d1c/FLAG659808b0d [2022-04-05 04:49:17,731 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e244568/ea14ace128b24511b6fbe61515838d1c [2022-04-05 04:49:17,734 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 04:49:17,736 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-05 04:49:17,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 04:49:17,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 04:49:17,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 04:49:17,753 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 04:49:17" (1/1) ... [2022-04-05 04:49:17,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11040878 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:17, skipping insertion in model container [2022-04-05 04:49:17,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 04:49:17" (1/1) ... [2022-04-05 04:49:17,760 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 04:49:17,775 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 04:49:17,918 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c[327,340] [2022-04-05 04:49:17,951 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 04:49:17,969 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 04:49:17,987 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c[327,340] [2022-04-05 04:49:18,011 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 04:49:18,025 INFO L208 MainTranslator]: Completed translation [2022-04-05 04:49:18,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18 WrapperNode [2022-04-05 04:49:18,033 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 04:49:18,035 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 04:49:18,035 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 04:49:18,035 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 04:49:18,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,056 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,056 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,073 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,076 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,079 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 04:49:18,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 04:49:18,081 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 04:49:18,081 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 04:49:18,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 04:49:18,103 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:18,113 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 04:49:18,115 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 04:49:18,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 04:49:18,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 04:49:18,140 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 04:49:18,140 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 04:49:18,140 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 04:49:18,140 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 04:49:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 04:49:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 04:49:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 04:49:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 04:49:18,195 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 04:49:18,197 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 04:49:18,303 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 04:49:18,309 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 04:49:18,310 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-04-05 04:49:18,311 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 04:49:18 BoogieIcfgContainer [2022-04-05 04:49:18,312 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 04:49:18,312 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-05 04:49:18,312 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-05 04:49:18,313 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-05 04:49:18,320 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 04:49:18" (1/1) ... [2022-04-05 04:49:18,322 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-05 04:49:18,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 04:49:18 BasicIcfg [2022-04-05 04:49:18,336 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-05 04:49:18,338 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 04:49:18,338 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 04:49:18,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 04:49:18,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 04:49:17" (1/4) ... [2022-04-05 04:49:18,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1608d552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 04:49:18, skipping insertion in model container [2022-04-05 04:49:18,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 04:49:18" (2/4) ... [2022-04-05 04:49:18,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1608d552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 04:49:18, skipping insertion in model container [2022-04-05 04:49:18,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 04:49:18" (3/4) ... [2022-04-05 04:49:18,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1608d552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 04:49:18, skipping insertion in model container [2022-04-05 04:49:18,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 04:49:18" (4/4) ... [2022-04-05 04:49:18,346 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-3.cqvasr [2022-04-05 04:49:18,351 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-05 04:49:18,351 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 04:49:18,394 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 04:49:18,399 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 04:49:18,399 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 04:49:18,418 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 04:49:18,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 04:49:18,423 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:18,424 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:18,424 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:18,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:18,432 INFO L85 PathProgramCache]: Analyzing trace with hash 677474136, now seen corresponding path program 1 times [2022-04-05 04:49:18,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:18,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918337717] [2022-04-05 04:49:18,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:18,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:18,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:18,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:18,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:18,660 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 04:49:18,660 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:18,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918337717] [2022-04-05 04:49:18,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918337717] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 04:49:18,661 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 04:49:18,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-05 04:49:18,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050840641] [2022-04-05 04:49:18,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 04:49:18,667 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-05 04:49:18,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:18,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-05 04:49:18,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 04:49:18,700 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:18,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:18,738 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2022-04-05 04:49:18,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-05 04:49:18,740 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-05 04:49:18,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:18,745 INFO L225 Difference]: With dead ends: 46 [2022-04-05 04:49:18,746 INFO L226 Difference]: Without dead ends: 22 [2022-04-05 04:49:18,748 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 04:49:18,752 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:18,753 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 04:49:18,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-04-05 04:49:18,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-04-05 04:49:18,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 04:49:18,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-04-05 04:49:18,791 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2022-04-05 04:49:18,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:18,791 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-04-05 04:49:18,791 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:18,792 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-04-05 04:49:18,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 04:49:18,792 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:18,792 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:18,793 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 04:49:18,793 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:18,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:18,794 INFO L85 PathProgramCache]: Analyzing trace with hash -242476646, now seen corresponding path program 1 times [2022-04-05 04:49:18,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:18,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614714970] [2022-04-05 04:49:18,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:18,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:18,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,051 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:19,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,064 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 04:49:19,065 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:19,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614714970] [2022-04-05 04:49:19,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614714970] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 04:49:19,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 04:49:19,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 04:49:19,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932932665] [2022-04-05 04:49:19,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 04:49:19,067 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 04:49:19,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:19,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 04:49:19,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-05 04:49:19,068 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:19,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:19,210 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2022-04-05 04:49:19,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 04:49:19,211 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-05 04:49:19,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:19,212 INFO L225 Difference]: With dead ends: 35 [2022-04-05 04:49:19,212 INFO L226 Difference]: Without dead ends: 24 [2022-04-05 04:49:19,216 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-04-05 04:49:19,217 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:19,218 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 28 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 04:49:19,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-04-05 04:49:19,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-04-05 04:49:19,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 04:49:19,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-05 04:49:19,236 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2022-04-05 04:49:19,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:19,236 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-05 04:49:19,236 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:19,236 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-05 04:49:19,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-05 04:49:19,237 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:19,237 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:19,237 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 04:49:19,238 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:19,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:19,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1931903288, now seen corresponding path program 1 times [2022-04-05 04:49:19,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:19,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158807779] [2022-04-05 04:49:19,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:19,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:19,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:19,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 04:49:19,446 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:19,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158807779] [2022-04-05 04:49:19,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158807779] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 04:49:19,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 04:49:19,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 04:49:19,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144959195] [2022-04-05 04:49:19,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 04:49:19,448 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 04:49:19,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:19,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 04:49:19,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 04:49:19,448 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:19,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:19,509 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-04-05 04:49:19,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 04:49:19,509 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-04-05 04:49:19,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:19,512 INFO L225 Difference]: With dead ends: 40 [2022-04-05 04:49:19,512 INFO L226 Difference]: Without dead ends: 25 [2022-04-05 04:49:19,514 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-05 04:49:19,519 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 19 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:19,520 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 28 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 04:49:19,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-04-05 04:49:19,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2022-04-05 04:49:19,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 04:49:19,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-04-05 04:49:19,536 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-04-05 04:49:19,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:19,536 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-04-05 04:49:19,537 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:19,537 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-04-05 04:49:19,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-05 04:49:19,538 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:19,538 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:19,538 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-05 04:49:19,538 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:19,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:19,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1226486282, now seen corresponding path program 1 times [2022-04-05 04:49:19,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:19,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320045424] [2022-04-05 04:49:19,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:19,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:19,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:19,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,718 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 04:49:19,718 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:19,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320045424] [2022-04-05 04:49:19,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320045424] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:19,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213152314] [2022-04-05 04:49:19,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:19,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:19,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:19,721 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 04:49:19,731 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 04:49:19,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:19,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 34 conjunts are in the unsatisfiable core [2022-04-05 04:49:19,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:19,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:49:20,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-04-05 04:49:20,360 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:20,361 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:20,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-04-05 04:49:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 04:49:20,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:20,703 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:20,704 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-05 04:49:20,738 INFO L356 Elim1Store]: treesize reduction 26, result has 39.5 percent of original size [2022-04-05 04:49:20,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 116 treesize of output 102 [2022-04-05 04:49:20,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:20,779 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-05 04:49:20,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-05 04:49:20,815 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:20,815 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-05 04:49:20,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:20,831 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-05 04:49:20,838 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-05 04:49:20,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:20,861 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-05 04:49:20,861 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 110 treesize of output 89 [2022-04-05 04:49:21,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 04:49:21,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213152314] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:21,076 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:21,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 11, 10] total 19 [2022-04-05 04:49:21,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463489265] [2022-04-05 04:49:21,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:21,077 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-05 04:49:21,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:21,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-05 04:49:21,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-04-05 04:49:21,082 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:22,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:22,552 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2022-04-05 04:49:22,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-04-05 04:49:22,553 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-04-05 04:49:22,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:22,555 INFO L225 Difference]: With dead ends: 67 [2022-04-05 04:49:22,555 INFO L226 Difference]: Without dead ends: 52 [2022-04-05 04:49:22,556 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=274, Invalid=1132, Unknown=0, NotChecked=0, Total=1406 [2022-04-05 04:49:22,557 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 51 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:22,557 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 66 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-05 04:49:22,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-05 04:49:22,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 35. [2022-04-05 04:49:22,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 28 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 04:49:22,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2022-04-05 04:49:22,568 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 19 [2022-04-05 04:49:22,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:22,569 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2022-04-05 04:49:22,569 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:22,569 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2022-04-05 04:49:22,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-05 04:49:22,570 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:22,570 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:22,598 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 04:49:22,783 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:22,784 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:22,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:22,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1057862574, now seen corresponding path program 2 times [2022-04-05 04:49:22,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:22,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979900334] [2022-04-05 04:49:22,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:22,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:22,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:22,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:22,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:22,987 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 04:49:22,987 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:22,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979900334] [2022-04-05 04:49:22,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979900334] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:22,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184083929] [2022-04-05 04:49:22,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 04:49:22,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:22,988 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:22,989 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 04:49:22,990 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 04:49:23,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 04:49:23,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:49:23,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 33 conjunts are in the unsatisfiable core [2022-04-05 04:49:23,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:23,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:49:23,307 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-05 04:49:23,618 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:23,625 INFO L356 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2022-04-05 04:49:23,626 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 13 [2022-04-05 04:49:23,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 04:49:23,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:23,953 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:23,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-05 04:49:24,020 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-04-05 04:49:24,020 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2022-04-05 04:49:24,025 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-05 04:49:24,044 INFO L356 Elim1Store]: treesize reduction 27, result has 34.1 percent of original size [2022-04-05 04:49:24,044 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 45 [2022-04-05 04:49:24,059 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:24,060 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-05 04:49:24,134 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-05 04:49:24,135 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2022-04-05 04:49:24,143 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2022-04-05 04:49:24,146 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-05 04:49:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 04:49:24,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184083929] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:24,348 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:24,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-04-05 04:49:24,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104968543] [2022-04-05 04:49:24,348 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:24,349 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-04-05 04:49:24,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:24,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-04-05 04:49:24,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2022-04-05 04:49:24,350 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:26,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:26,020 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2022-04-05 04:49:26,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-05 04:49:26,021 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-04-05 04:49:26,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:26,022 INFO L225 Difference]: With dead ends: 69 [2022-04-05 04:49:26,022 INFO L226 Difference]: Without dead ends: 51 [2022-04-05 04:49:26,023 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=375, Invalid=1695, Unknown=0, NotChecked=0, Total=2070 [2022-04-05 04:49:26,024 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 61 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:26,024 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 78 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-05 04:49:26,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-04-05 04:49:26,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2022-04-05 04:49:26,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 04:49:26,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-04-05 04:49:26,034 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2022-04-05 04:49:26,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:26,034 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-04-05 04:49:26,034 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:26,034 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-04-05 04:49:26,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-05 04:49:26,035 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:26,035 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:26,061 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 04:49:26,251 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 04:49:26,251 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:26,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:26,252 INFO L85 PathProgramCache]: Analyzing trace with hash -126211412, now seen corresponding path program 3 times [2022-04-05 04:49:26,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:26,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204822647] [2022-04-05 04:49:26,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:26,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:26,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:26,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:26,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:26,419 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:26,419 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204822647] [2022-04-05 04:49:26,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204822647] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956283159] [2022-04-05 04:49:26,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 04:49:26,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:26,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:26,421 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 04:49:26,447 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 04:49:26,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-04-05 04:49:26,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:49:26,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2022-04-05 04:49:26,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:26,611 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:26,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:26,725 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:26,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956283159] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:26,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:26,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 13 [2022-04-05 04:49:26,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128680279] [2022-04-05 04:49:26,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:26,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-05 04:49:26,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:26,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-05 04:49:26,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2022-04-05 04:49:26,727 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:26,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:26,944 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2022-04-05 04:49:26,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-05 04:49:26,945 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-04-05 04:49:26,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:26,946 INFO L225 Difference]: With dead ends: 77 [2022-04-05 04:49:26,947 INFO L226 Difference]: Without dead ends: 47 [2022-04-05 04:49:26,947 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=116, Invalid=264, Unknown=0, NotChecked=0, Total=380 [2022-04-05 04:49:26,948 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:26,948 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 49 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 04:49:26,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-04-05 04:49:26,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-04-05 04:49:26,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 40 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 04:49:26,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2022-04-05 04:49:26,964 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2022-04-05 04:49:26,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:26,964 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2022-04-05 04:49:26,964 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:26,965 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2022-04-05 04:49:26,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-05 04:49:26,965 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:26,966 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:26,993 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 04:49:27,183 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 04:49:27,184 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:27,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:27,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1457388698, now seen corresponding path program 4 times [2022-04-05 04:49:27,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:27,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308326416] [2022-04-05 04:49:27,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:27,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:27,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:28,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:28,178 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 04:49:28,179 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:28,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308326416] [2022-04-05 04:49:28,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308326416] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:28,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731291738] [2022-04-05 04:49:28,179 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 04:49:28,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:28,180 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:28,181 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 04:49:28,182 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 04:49:28,258 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 04:49:28,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:49:28,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 45 conjunts are in the unsatisfiable core [2022-04-05 04:49:28,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:28,280 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:49:28,926 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-05 04:49:29,264 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:29,271 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-05 04:49:29,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 13 [2022-04-05 04:49:29,331 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:29,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:29,605 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:29,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-05 04:49:29,690 INFO L356 Elim1Store]: treesize reduction 27, result has 34.1 percent of original size [2022-04-05 04:49:29,691 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 45 [2022-04-05 04:49:29,705 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-04-05 04:49:29,706 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 1 [2022-04-05 04:49:29,715 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:29,715 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-05 04:49:29,769 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-04-05 04:49:29,769 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-04-05 04:49:29,773 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-05 04:49:29,797 INFO L356 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2022-04-05 04:49:29,798 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 49 [2022-04-05 04:49:30,353 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:30,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731291738] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:30,354 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:30,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19, 18] total 50 [2022-04-05 04:49:30,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691888784] [2022-04-05 04:49:30,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:30,354 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-04-05 04:49:30,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:30,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-04-05 04:49:30,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2147, Unknown=0, NotChecked=0, Total=2450 [2022-04-05 04:49:30,356 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 50 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:38,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:38,710 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2022-04-05 04:49:38,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-04-05 04:49:38,710 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-04-05 04:49:38,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:38,712 INFO L225 Difference]: With dead ends: 147 [2022-04-05 04:49:38,712 INFO L226 Difference]: Without dead ends: 145 [2022-04-05 04:49:38,717 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3633 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2087, Invalid=12193, Unknown=0, NotChecked=0, Total=14280 [2022-04-05 04:49:38,718 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 257 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 2220 mSolverCounterSat, 600 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 2820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 600 IncrementalHoareTripleChecker+Valid, 2220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:38,718 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 144 Invalid, 2820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [600 Valid, 2220 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-04-05 04:49:38,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-04-05 04:49:38,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 42. [2022-04-05 04:49:38,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 34 states have (on average 1.088235294117647) internal successors, (37), 35 states have internal predecessors, (37), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 04:49:38,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-04-05 04:49:38,735 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 35 [2022-04-05 04:49:38,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:38,736 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-04-05 04:49:38,736 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 04:49:38,736 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-04-05 04:49:38,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-04-05 04:49:38,737 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:38,737 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:38,758 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-04-05 04:49:38,951 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 04:49:38,952 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:38,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:38,952 INFO L85 PathProgramCache]: Analyzing trace with hash -349680096, now seen corresponding path program 1 times [2022-04-05 04:49:38,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:38,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714394668] [2022-04-05 04:49:38,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:38,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:38,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:39,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:39,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:39,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-04-05 04:49:39,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:39,168 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-04-05 04:49:39,168 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:39,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714394668] [2022-04-05 04:49:39,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714394668] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:39,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418362162] [2022-04-05 04:49:39,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:39,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:39,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:39,170 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 04:49:39,171 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 04:49:39,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:39,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 44 conjunts are in the unsatisfiable core [2022-04-05 04:49:39,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:39,247 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:49:39,486 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-05 04:49:39,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:39,610 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-04-05 04:49:42,153 WARN L855 $PredicateComparison]: unable to prove that (exists ((aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 Int) (aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 Int) (|v_main_~#str2~0.base_BEFORE_CALL_1| Int) (aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143 Int) (aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123 Int) (aux_div_v_main_~j~0_BEFORE_CALL_1_46 Int) (|v_main_~#str1~0.base_BEFORE_CALL_1| Int)) (let ((.cse1 (* aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 4294967296))) (let ((.cse0 (+ aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 .cse1))) (and (= (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_1|) 1) (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_1|) (+ (- 1) (mod (+ 4294967295 (* 4294967295 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168)) 4294967296)))) (<= 0 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168) (< aux_div_v_main_~j~0_BEFORE_CALL_1_46 (+ aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143 1)) (<= .cse0 4294967295) (< 0 (+ aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 1 .cse1)) (<= .cse0 (+ (* aux_div_v_main_~j~0_BEFORE_CALL_1_46 4294967296) 4294967295)) (<= .cse0 (+ (* aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123 4294967296) 4294967293)) (< aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123 (+ aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143_168 1)) (<= (+ (* aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_1_46_123_143 4294967296) 4294967293) .cse0) (not (= |v_main_~#str2~0.base_BEFORE_CALL_1| |v_main_~#str1~0.base_BEFORE_CALL_1|)))))) is different from true [2022-04-05 04:49:44,940 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:44,943 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:44,944 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 10 [2022-04-05 04:49:45,025 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 25 trivial. 2 not checked. [2022-04-05 04:49:45,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:45,512 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:45,512 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-05 04:49:45,860 INFO L356 Elim1Store]: treesize reduction 31, result has 34.0 percent of original size [2022-04-05 04:49:45,861 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 233 treesize of output 206 [2022-04-05 04:49:45,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:45,882 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 47 [2022-04-05 04:49:45,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 436 treesize of output 400 [2022-04-05 04:49:45,963 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-05 04:49:45,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 105 treesize of output 92 [2022-04-05 04:49:46,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,009 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-05 04:49:46,016 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 236 treesize of output 218 [2022-04-05 04:49:46,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,068 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-05 04:49:46,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,072 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:46,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,089 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-05 04:49:46,089 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 129 treesize of output 108 [2022-04-05 04:49:46,154 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:46,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-05 04:49:46,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,509 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:46,509 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 256 treesize of output 227 [2022-04-05 04:49:46,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:46,775 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-05 04:49:46,778 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:46,780 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-05 04:49:47,294 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:47,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418362162] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:47,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:47,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 18, 17] total 37 [2022-04-05 04:49:47,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422869370] [2022-04-05 04:49:47,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:47,295 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-04-05 04:49:47,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:47,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-04-05 04:49:47,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1107, Unknown=1, NotChecked=68, Total=1332 [2022-04-05 04:49:47,296 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 37 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 04:49:50,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:49:50,084 INFO L93 Difference]: Finished difference Result 84 states and 92 transitions. [2022-04-05 04:49:50,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-04-05 04:49:50,085 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2022-04-05 04:49:50,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:49:50,085 INFO L225 Difference]: With dead ends: 84 [2022-04-05 04:49:50,086 INFO L226 Difference]: Without dead ends: 67 [2022-04-05 04:49:50,087 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=499, Invalid=3164, Unknown=1, NotChecked=118, Total=3782 [2022-04-05 04:49:50,087 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-05 04:49:50,088 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 106 Invalid, 922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 632 Invalid, 0 Unknown, 158 Unchecked, 0.5s Time] [2022-04-05 04:49:50,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-04-05 04:49:50,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 59. [2022-04-05 04:49:50,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-05 04:49:50,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2022-04-05 04:49:50,109 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 39 [2022-04-05 04:49:50,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:49:50,109 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2022-04-05 04:49:50,109 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 04:49:50,109 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2022-04-05 04:49:50,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-05 04:49:50,111 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:49:50,111 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:49:50,139 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 04:49:50,331 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 04:49:50,332 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:49:50,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:49:50,332 INFO L85 PathProgramCache]: Analyzing trace with hash -821800838, now seen corresponding path program 2 times [2022-04-05 04:49:50,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:49:50,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988775568] [2022-04-05 04:49:50,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:49:50,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:49:50,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:50,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:49:50,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:50,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-04-05 04:49:50,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:49:50,528 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-04-05 04:49:50,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:49:50,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988775568] [2022-04-05 04:49:50,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988775568] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:49:50,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500236333] [2022-04-05 04:49:50,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 04:49:50,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:49:50,529 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:49:50,532 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 04:49:50,559 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 04:49:50,614 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 04:49:50,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:49:50,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 57 conjunts are in the unsatisfiable core [2022-04-05 04:49:50,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:49:50,634 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:49:51,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-05 04:49:51,275 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-04-05 04:49:51,275 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-04-05 04:49:53,814 WARN L855 $PredicateComparison]: unable to prove that (exists ((aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 Int) (|v_main_~#str2~0.base_BEFORE_CALL_3| Int) (aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 Int) (aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119 Int) (aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 Int) (|v_main_~#str2~0.offset_BEFORE_CALL_3| Int) (|v_main_~#str1~0.base_BEFORE_CALL_3| Int) (aux_div_v_main_~j~0_BEFORE_CALL_3_56 Int)) (let ((.cse1 (* aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 4294967296))) (let ((.cse0 (+ .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172))) (and (<= .cse0 (+ (* 4294967296 aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119) 5)) (<= .cse0 (* aux_div_v_main_~j~0_BEFORE_CALL_3_56 4294967296)) (< 0 (+ 4294967291 .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172)) (< aux_div_v_main_~j~0_BEFORE_CALL_3_56 (+ aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 1)) (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_3|) (+ (mod (+ (* 4294967295 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172) 5) 4294967296) (- 4))) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_3|) (+ |v_main_~#str2~0.offset_BEFORE_CALL_3| 4))) (<= .cse0 5) (not (= |v_main_~#str2~0.base_BEFORE_CALL_3| |v_main_~#str1~0.base_BEFORE_CALL_3|)) (< aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119 (+ aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 1)) (<= 0 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172) (<= (* aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 4294967296) (+ 4294967290 .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172)))))) is different from true [2022-04-05 04:49:54,921 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:49:54,929 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-05 04:49:54,930 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 13 [2022-04-05 04:49:55,002 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 2 not checked. [2022-04-05 04:49:55,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:49:55,567 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:55,567 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-05 04:49:55,858 INFO L356 Elim1Store]: treesize reduction 25, result has 46.8 percent of original size [2022-04-05 04:49:55,858 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 515 treesize of output 452 [2022-04-05 04:49:56,204 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-04-05 04:49:56,205 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 1 [2022-04-05 04:49:56,234 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:49:56,235 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-05 04:49:56,705 INFO L356 Elim1Store]: treesize reduction 30, result has 36.2 percent of original size [2022-04-05 04:49:56,706 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 505 treesize of output 437 [2022-04-05 04:49:56,821 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-04-05 04:49:56,822 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 1 [2022-04-05 04:49:56,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:56,856 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-05 04:49:56,861 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 236 treesize of output 218 [2022-04-05 04:49:56,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:49:56,906 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-05 04:49:56,907 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 284 treesize of output 218 [2022-04-05 04:49:56,953 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-04-05 04:49:56,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 1 [2022-04-05 04:49:57,726 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 2 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-05 04:49:57,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500236333] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:49:57,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:49:57,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 24, 23] total 50 [2022-04-05 04:49:57,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563242710] [2022-04-05 04:49:57,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:49:57,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-04-05 04:49:57,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:49:57,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-04-05 04:49:57,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=2074, Unknown=1, NotChecked=94, Total=2450 [2022-04-05 04:49:57,729 INFO L87 Difference]: Start difference. First operand 59 states and 64 transitions. Second operand has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 04:50:00,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:50:00,755 INFO L93 Difference]: Finished difference Result 101 states and 111 transitions. [2022-04-05 04:50:00,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-04-05 04:50:00,756 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 45 [2022-04-05 04:50:00,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:50:00,759 INFO L225 Difference]: With dead ends: 101 [2022-04-05 04:50:00,759 INFO L226 Difference]: Without dead ends: 82 [2022-04-05 04:50:00,761 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1684 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=937, Invalid=6038, Unknown=1, NotChecked=164, Total=7140 [2022-04-05 04:50:00,763 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 71 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 1054 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 1378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 1054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-04-05 04:50:00,764 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 151 Invalid, 1378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 1054 Invalid, 0 Unknown, 148 Unchecked, 0.7s Time] [2022-04-05 04:50:00,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-04-05 04:50:00,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 54. [2022-04-05 04:50:00,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 04:50:00,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2022-04-05 04:50:00,807 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 45 [2022-04-05 04:50:00,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:50:00,811 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2022-04-05 04:50:00,811 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 48 states have internal predecessors, (82), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 04:50:00,812 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2022-04-05 04:50:00,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-05 04:50:00,812 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:50:00,812 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:50:00,834 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 04:50:01,015 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 04:50:01,016 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:50:01,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:50:01,016 INFO L85 PathProgramCache]: Analyzing trace with hash -246889932, now seen corresponding path program 3 times [2022-04-05 04:50:01,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:50:01,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575526741] [2022-04-05 04:50:01,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:50:01,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:50:01,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:01,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:50:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:01,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-04-05 04:50:01,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:01,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-04-05 04:50:01,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:01,222 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-04-05 04:50:01,223 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:50:01,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575526741] [2022-04-05 04:50:01,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575526741] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:50:01,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47140690] [2022-04-05 04:50:01,223 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 04:50:01,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:50:01,223 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:50:01,224 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 04:50:01,225 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 04:50:01,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-04-05 04:50:01,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:50:01,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 60 conjunts are in the unsatisfiable core [2022-04-05 04:50:01,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:50:01,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:50:01,598 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-05 04:50:01,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:01,692 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2022-04-05 04:50:01,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:01,783 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2022-04-05 04:50:12,648 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:12,650 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:12,650 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 10 [2022-04-05 04:50:13,049 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-04-05 04:50:13,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:50:16,230 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:50:16,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 502 treesize of output 474 [2022-04-05 04:50:18,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:18,932 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:50:18,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 524 treesize of output 479 [2022-04-05 04:50:19,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:19,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2022-04-05 04:50:19,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:19,308 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:19,308 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:19,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:19,369 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2022-04-05 04:50:19,377 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1014 treesize of output 978 [2022-04-05 04:50:19,693 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-05 04:50:19,693 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 229 treesize of output 216 [2022-04-05 04:50:20,033 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-05 04:50:20,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 265 treesize of output 240 [2022-04-05 04:50:20,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2022-04-05 04:50:20,149 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:20,149 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:20,159 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-05 04:50:20,247 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:50:20,247 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 502 treesize of output 474 [2022-04-05 04:50:21,945 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-05 04:50:21,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 237 treesize of output 224 [2022-04-05 04:50:22,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:22,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2022-04-05 04:50:22,456 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 504 treesize of output 486 [2022-04-05 04:50:22,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-05 04:50:22,599 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-05 04:50:22,599 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 515 treesize of output 465 [2022-04-05 04:50:22,841 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:22,849 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-05 04:50:22,849 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 105 treesize of output 92 [2022-04-05 04:50:23,987 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 24 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-05 04:50:23,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47140690] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 04:50:23,987 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 04:50:23,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 23, 21] total 47 [2022-04-05 04:50:23,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779250642] [2022-04-05 04:50:23,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 04:50:23,991 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-04-05 04:50:23,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 04:50:23,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-04-05 04:50:23,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1930, Unknown=1, NotChecked=0, Total=2162 [2022-04-05 04:50:23,992 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 47 states, 46 states have (on average 1.6956521739130435) internal successors, (78), 45 states have internal predecessors, (78), 7 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-05 04:50:35,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 04:50:35,059 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2022-04-05 04:50:35,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-04-05 04:50:35,059 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.6956521739130435) internal successors, (78), 45 states have internal predecessors, (78), 7 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 49 [2022-04-05 04:50:35,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 04:50:35,060 INFO L225 Difference]: With dead ends: 88 [2022-04-05 04:50:35,060 INFO L226 Difference]: Without dead ends: 63 [2022-04-05 04:50:35,061 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=545, Invalid=4421, Unknown=4, NotChecked=0, Total=4970 [2022-04-05 04:50:35,061 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 46 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 676 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 676 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 170 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-05 04:50:35,061 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 132 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 676 Invalid, 0 Unknown, 170 Unchecked, 0.5s Time] [2022-04-05 04:50:35,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-05 04:50:35,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-04-05 04:50:35,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.04) internal successors, (52), 51 states have internal predecessors, (52), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-05 04:50:35,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-04-05 04:50:35,081 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 49 [2022-04-05 04:50:35,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 04:50:35,081 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-04-05 04:50:35,081 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.6956521739130435) internal successors, (78), 45 states have internal predecessors, (78), 7 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-05 04:50:35,081 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-04-05 04:50:35,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-04-05 04:50:35,082 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 04:50:35,082 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 04:50:35,108 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 04:50:35,295 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 04:50:35,296 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 04:50:35,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 04:50:35,296 INFO L85 PathProgramCache]: Analyzing trace with hash -458263352, now seen corresponding path program 4 times [2022-04-05 04:50:35,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 04:50:35,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140234503] [2022-04-05 04:50:35,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 04:50:35,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 04:50:35,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:36,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 04:50:36,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:36,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-04-05 04:50:36,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:36,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2022-04-05 04:50:36,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:36,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-04-05 04:50:36,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 04:50:36,499 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 6 proven. 52 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 04:50:36,499 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 04:50:36,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140234503] [2022-04-05 04:50:36,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140234503] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 04:50:36,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605967421] [2022-04-05 04:50:36,499 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 04:50:36,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 04:50:36,500 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 04:50:36,508 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 04:50:36,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-05 04:50:36,594 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 04:50:36,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 04:50:36,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 67 conjunts are in the unsatisfiable core [2022-04-05 04:50:36,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 04:50:36,616 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-05 04:50:36,847 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-05 04:50:36,998 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-04-05 04:50:37,159 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-04-05 04:50:37,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-04-05 04:50:38,278 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str1~0.base_BEFORE_CALL_9| Int) (|v_main_~#str2~0.base_BEFORE_CALL_9| Int)) (and (not (= |v_main_~#str2~0.base_BEFORE_CALL_9| |v_main_~#str1~0.base_BEFORE_CALL_9|)) (= (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_9|) 1) (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_9|) 3)))) is different from true [2022-04-05 04:50:39,071 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str2~0.base_BEFORE_CALL_10| Int) (|v_main_~#str1~0.base_BEFORE_CALL_10| Int)) (and (not (= |v_main_~#str1~0.base_BEFORE_CALL_10| |v_main_~#str2~0.base_BEFORE_CALL_10|)) (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_10|) 3) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_10|) 1)))) is different from true [2022-04-05 04:50:39,821 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str1~0.base_BEFORE_CALL_11| Int) (|v_main_~#str2~0.base_BEFORE_CALL_11| Int)) (and (not (= |v_main_~#str1~0.base_BEFORE_CALL_11| |v_main_~#str2~0.base_BEFORE_CALL_11|)) (= (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_11|) 1) (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_11|) 3)))) is different from true [2022-04-05 04:50:40,025 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:40,026 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-05 04:50:40,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-04-05 04:50:40,077 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 25 trivial. 18 not checked. [2022-04-05 04:50:40,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 04:50:42,185 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-05 04:50:42,185 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 2266 treesize of output 2138