/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 18:48:08,244 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 18:48:08,248 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 18:48:08,297 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-23 18:48:08,298 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-23 18:48:08,302 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-23 18:48:08,306 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-23 18:48:08,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-23 18:48:08,318 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-23 18:48:08,326 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-23 18:48:08,327 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-23 18:48:08,329 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-23 18:48:08,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 18:48:08,332 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 18:48:08,334 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 18:48:08,335 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 18:48:08,339 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 18:48:08,340 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 18:48:08,347 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 18:48:08,350 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 18:48:08,351 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 18:48:08,355 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 18:48:08,357 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 18:48:08,360 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 18:48:08,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-23 18:48:08,369 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-23 18:48:08,369 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-23 18:48:08,370 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-23 18:48:08,370 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-23 18:48:08,371 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-23 18:48:08,372 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-23 18:48:08,373 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-23 18:48:08,376 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-23 18:48:08,377 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-23 18:48:08,378 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-23 18:48:08,378 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-23 18:48:08,379 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-23 18:48:08,379 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-23 18:48:08,380 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 18:48:08,381 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 18:48:08,381 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 18:48:08,382 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 18:48:08,416 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 18:48:08,416 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 18:48:08,421 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 18:48:08,421 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 18:48:08,422 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 18:48:08,422 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 18:48:08,422 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 18:48:08,422 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 18:48:08,423 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 18:48:08,423 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 18:48:08,424 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 18:48:08,424 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 18:48:08,424 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 18:48:08,425 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 18:48:08,425 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 18:48:08,425 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 18:48:08,425 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 18:48:08,426 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 18:48:08,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 18:48:08,426 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 18:48:08,426 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 18:48:08,427 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 18:48:08,427 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 18:48:08,845 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 18:48:08,873 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 18:48:08,876 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 18:48:08,877 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 18:48:08,878 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 18:48:08,879 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2021-02-23 18:48:08,959 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbe74ca1e/7df488d6ae564e93b624266a3db02b19/FLAG846594f7a [2021-02-23 18:48:09,556 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 18:48:09,557 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2021-02-23 18:48:09,563 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbe74ca1e/7df488d6ae564e93b624266a3db02b19/FLAG846594f7a [2021-02-23 18:48:09,908 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbe74ca1e/7df488d6ae564e93b624266a3db02b19 [2021-02-23 18:48:09,911 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 18:48:09,923 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 18:48:09,925 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 18:48:09,925 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 18:48:09,929 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 18:48:09,929 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:48:09" (1/1) ... [2021-02-23 18:48:09,931 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@773e9dfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:09, skipping insertion in model container [2021-02-23 18:48:09,931 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:48:09" (1/1) ... [2021-02-23 18:48:09,939 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 18:48:09,956 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 18:48:10,104 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2021-02-23 18:48:10,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:48:10,136 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 18:48:10,150 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2021-02-23 18:48:10,162 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:48:10,178 INFO L208 MainTranslator]: Completed translation [2021-02-23 18:48:10,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10 WrapperNode [2021-02-23 18:48:10,179 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 18:48:10,180 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 18:48:10,181 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 18:48:10,181 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 18:48:10,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,201 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,201 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,219 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,221 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... [2021-02-23 18:48:10,224 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 18:48:10,225 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 18:48:10,225 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 18:48:10,225 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 18:48:10,226 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 18:48:10,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 18:48:10,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 18:48:10,335 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 18:48:10,335 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-02-23 18:48:10,335 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-23 18:48:10,336 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 18:48:10,336 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 18:48:10,336 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 18:48:10,337 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-02-23 18:48:10,337 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-02-23 18:48:10,338 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 18:48:10,338 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 18:48:10,338 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-02-23 18:48:10,338 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-23 18:48:10,339 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-02-23 18:48:10,339 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 18:48:10,339 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 18:48:10,339 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 18:48:10,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 18:48:10,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 18:48:10,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 18:48:10,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 18:48:10,787 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 18:48:10,788 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-02-23 18:48:10,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:48:10 BoogieIcfgContainer [2021-02-23 18:48:10,790 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 18:48:10,791 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 18:48:10,791 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 18:48:10,795 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 18:48:10,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 06:48:09" (1/3) ... [2021-02-23 18:48:10,796 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6961d892 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:48:10, skipping insertion in model container [2021-02-23 18:48:10,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:10" (2/3) ... [2021-02-23 18:48:10,796 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6961d892 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:48:10, skipping insertion in model container [2021-02-23 18:48:10,797 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:48:10" (3/3) ... [2021-02-23 18:48:10,798 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-02-23 18:48:10,804 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 18:48:10,809 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 18:48:10,825 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 18:48:10,846 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 18:48:10,846 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 18:48:10,847 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 18:48:10,847 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 18:48:10,847 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 18:48:10,847 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 18:48:10,847 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 18:48:10,847 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 18:48:10,864 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states. [2021-02-23 18:48:10,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-02-23 18:48:10,875 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:10,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:10,877 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:10,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:10,883 INFO L82 PathProgramCache]: Analyzing trace with hash -449373515, now seen corresponding path program 1 times [2021-02-23 18:48:10,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:10,893 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230033261] [2021-02-23 18:48:10,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:10,960 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:11,080 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,081 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,082 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,083 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:11,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:11,131 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,132 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:11,145 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230033261] [2021-02-23 18:48:11,147 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:11,148 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-23 18:48:11,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997063584] [2021-02-23 18:48:11,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-23 18:48:11,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:11,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-23 18:48:11,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-23 18:48:11,170 INFO L87 Difference]: Start difference. First operand 110 states. Second operand 3 states. [2021-02-23 18:48:11,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:11,484 INFO L93 Difference]: Finished difference Result 193 states and 220 transitions. [2021-02-23 18:48:11,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-23 18:48:11,487 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 41 [2021-02-23 18:48:11,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:11,497 INFO L225 Difference]: With dead ends: 193 [2021-02-23 18:48:11,497 INFO L226 Difference]: Without dead ends: 81 [2021-02-23 18:48:11,502 INFO L677 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 [2021-02-23 18:48:11,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-02-23 18:48:11,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-02-23 18:48:11,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2021-02-23 18:48:11,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 86 transitions. [2021-02-23 18:48:11,579 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 86 transitions. Word has length 41 [2021-02-23 18:48:11,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:11,580 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 86 transitions. [2021-02-23 18:48:11,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-23 18:48:11,580 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 86 transitions. [2021-02-23 18:48:11,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-02-23 18:48:11,583 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:11,583 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:11,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 18:48:11,585 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:11,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:11,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1742045469, now seen corresponding path program 1 times [2021-02-23 18:48:11,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:11,588 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380135779] [2021-02-23 18:48:11,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:11,596 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:11,706 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,707 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,707 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,708 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:11,711 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,712 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:11,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:11,743 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:11,743 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:11,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:11,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380135779] [2021-02-23 18:48:11,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:11,748 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-23 18:48:11,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29449377] [2021-02-23 18:48:11,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-23 18:48:11,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:11,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-23 18:48:11,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-23 18:48:11,750 INFO L87 Difference]: Start difference. First operand 81 states and 86 transitions. Second operand 4 states. [2021-02-23 18:48:11,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:11,891 INFO L93 Difference]: Finished difference Result 148 states and 159 transitions. [2021-02-23 18:48:11,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-23 18:48:11,892 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 45 [2021-02-23 18:48:11,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:11,894 INFO L225 Difference]: With dead ends: 148 [2021-02-23 18:48:11,894 INFO L226 Difference]: Without dead ends: 93 [2021-02-23 18:48:11,896 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-23 18:48:11,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-02-23 18:48:11,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 83. [2021-02-23 18:48:11,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2021-02-23 18:48:11,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 88 transitions. [2021-02-23 18:48:11,909 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 88 transitions. Word has length 45 [2021-02-23 18:48:11,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:11,909 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 88 transitions. [2021-02-23 18:48:11,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-23 18:48:11,909 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 88 transitions. [2021-02-23 18:48:11,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-02-23 18:48:11,913 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:11,914 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:11,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 18:48:11,914 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:11,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:11,915 INFO L82 PathProgramCache]: Analyzing trace with hash 550833038, now seen corresponding path program 1 times [2021-02-23 18:48:11,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:11,915 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363291063] [2021-02-23 18:48:11,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:11,941 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:11,943 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:11,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,040 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,045 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,045 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,046 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,049 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,050 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,053 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,054 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,060 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,061 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:12,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,109 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,110 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:12,115 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363291063] [2021-02-23 18:48:12,115 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:12,115 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 18:48:12,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364773466] [2021-02-23 18:48:12,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 18:48:12,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:12,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 18:48:12,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-02-23 18:48:12,117 INFO L87 Difference]: Start difference. First operand 83 states and 88 transitions. Second operand 6 states. [2021-02-23 18:48:12,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:12,283 INFO L93 Difference]: Finished difference Result 156 states and 166 transitions. [2021-02-23 18:48:12,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 18:48:12,283 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 59 [2021-02-23 18:48:12,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:12,285 INFO L225 Difference]: With dead ends: 156 [2021-02-23 18:48:12,285 INFO L226 Difference]: Without dead ends: 100 [2021-02-23 18:48:12,286 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-02-23 18:48:12,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-02-23 18:48:12,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 90. [2021-02-23 18:48:12,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2021-02-23 18:48:12,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2021-02-23 18:48:12,314 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 59 [2021-02-23 18:48:12,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:12,314 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2021-02-23 18:48:12,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 18:48:12,315 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2021-02-23 18:48:12,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-02-23 18:48:12,320 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:12,320 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:12,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 18:48:12,320 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:12,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:12,321 INFO L82 PathProgramCache]: Analyzing trace with hash 453451025, now seen corresponding path program 2 times [2021-02-23 18:48:12,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:12,322 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837704440] [2021-02-23 18:48:12,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:12,330 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:12,331 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:12,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,377 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,377 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,378 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,379 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,381 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,382 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,386 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,386 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,391 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,392 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:12,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,418 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,418 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:12,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837704440] [2021-02-23 18:48:12,425 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:12,425 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 18:48:12,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748650642] [2021-02-23 18:48:12,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 18:48:12,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:12,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 18:48:12,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-02-23 18:48:12,427 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand 6 states. [2021-02-23 18:48:12,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:12,574 INFO L93 Difference]: Finished difference Result 146 states and 155 transitions. [2021-02-23 18:48:12,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 18:48:12,574 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 66 [2021-02-23 18:48:12,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:12,576 INFO L225 Difference]: With dead ends: 146 [2021-02-23 18:48:12,576 INFO L226 Difference]: Without dead ends: 102 [2021-02-23 18:48:12,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-02-23 18:48:12,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-02-23 18:48:12,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 97. [2021-02-23 18:48:12,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2021-02-23 18:48:12,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 102 transitions. [2021-02-23 18:48:12,587 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 102 transitions. Word has length 66 [2021-02-23 18:48:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:12,588 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 102 transitions. [2021-02-23 18:48:12,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 18:48:12,588 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 102 transitions. [2021-02-23 18:48:12,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-02-23 18:48:12,589 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:12,590 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:12,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-23 18:48:12,590 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:12,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:12,591 INFO L82 PathProgramCache]: Analyzing trace with hash -349605437, now seen corresponding path program 3 times [2021-02-23 18:48:12,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:12,591 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42807661] [2021-02-23 18:48:12,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:12,598 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:12,600 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:12,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,683 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,684 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,685 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,687 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,692 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,692 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,698 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,699 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,705 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,707 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,715 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,716 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:12,723 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,728 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:12,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:12,758 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:12,759 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:12,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:12,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42807661] [2021-02-23 18:48:12,766 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:12,766 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-23 18:48:12,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299678716] [2021-02-23 18:48:12,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-23 18:48:12,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:12,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-23 18:48:12,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-02-23 18:48:12,768 INFO L87 Difference]: Start difference. First operand 97 states and 102 transitions. Second operand 8 states. [2021-02-23 18:48:12,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:12,974 INFO L93 Difference]: Finished difference Result 172 states and 182 transitions. [2021-02-23 18:48:12,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-23 18:48:12,975 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 73 [2021-02-23 18:48:12,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:12,977 INFO L225 Difference]: With dead ends: 172 [2021-02-23 18:48:12,978 INFO L226 Difference]: Without dead ends: 109 [2021-02-23 18:48:12,980 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2021-02-23 18:48:12,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-02-23 18:48:13,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 104. [2021-02-23 18:48:13,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2021-02-23 18:48:13,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 109 transitions. [2021-02-23 18:48:13,007 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 109 transitions. Word has length 73 [2021-02-23 18:48:13,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:13,007 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 109 transitions. [2021-02-23 18:48:13,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-23 18:48:13,008 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 109 transitions. [2021-02-23 18:48:13,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-02-23 18:48:13,009 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:13,010 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:13,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-23 18:48:13,010 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:13,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:13,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1288625658, now seen corresponding path program 4 times [2021-02-23 18:48:13,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:13,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330523465] [2021-02-23 18:48:13,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:13,019 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:13,021 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:13,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:13,140 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,144 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,146 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,149 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,152 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,153 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,158 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,160 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,166 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,167 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,173 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,173 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,181 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,181 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,190 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,191 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,204 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,204 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:13,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:13,255 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,257 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:13,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330523465] [2021-02-23 18:48:13,267 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:13,267 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-23 18:48:13,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648015515] [2021-02-23 18:48:13,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-23 18:48:13,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:13,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-23 18:48:13,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-02-23 18:48:13,270 INFO L87 Difference]: Start difference. First operand 104 states and 109 transitions. Second operand 10 states. [2021-02-23 18:48:13,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:13,518 INFO L93 Difference]: Finished difference Result 179 states and 189 transitions. [2021-02-23 18:48:13,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-23 18:48:13,518 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 80 [2021-02-23 18:48:13,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:13,520 INFO L225 Difference]: With dead ends: 179 [2021-02-23 18:48:13,520 INFO L226 Difference]: Without dead ends: 116 [2021-02-23 18:48:13,521 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-02-23 18:48:13,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-02-23 18:48:13,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2021-02-23 18:48:13,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2021-02-23 18:48:13,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 116 transitions. [2021-02-23 18:48:13,529 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 116 transitions. Word has length 80 [2021-02-23 18:48:13,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:13,530 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 116 transitions. [2021-02-23 18:48:13,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-23 18:48:13,530 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 116 transitions. [2021-02-23 18:48:13,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-02-23 18:48:13,531 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:13,531 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:13,531 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-02-23 18:48:13,532 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:13,532 INFO L82 PathProgramCache]: Analyzing trace with hash 605171811, now seen corresponding path program 5 times [2021-02-23 18:48:13,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:13,533 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335062951] [2021-02-23 18:48:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:13,539 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:13,541 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:13,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:13,580 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,581 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,581 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,582 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,585 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,585 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,589 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,590 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,595 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,595 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,601 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,601 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,607 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,608 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,615 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,616 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,623 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,626 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,635 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,636 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:13,649 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,651 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:13,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:13,681 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:13,682 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:13,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:13,707 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335062951] [2021-02-23 18:48:13,707 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:13,707 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-02-23 18:48:13,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739403795] [2021-02-23 18:48:13,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-23 18:48:13,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:13,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-23 18:48:13,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-02-23 18:48:13,709 INFO L87 Difference]: Start difference. First operand 111 states and 116 transitions. Second operand 12 states. [2021-02-23 18:48:14,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:14,009 INFO L93 Difference]: Finished difference Result 181 states and 191 transitions. [2021-02-23 18:48:14,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-23 18:48:14,012 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 87 [2021-02-23 18:48:14,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:14,014 INFO L225 Difference]: With dead ends: 181 [2021-02-23 18:48:14,014 INFO L226 Difference]: Without dead ends: 118 [2021-02-23 18:48:14,015 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2021-02-23 18:48:14,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-02-23 18:48:14,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-02-23 18:48:14,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2021-02-23 18:48:14,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 123 transitions. [2021-02-23 18:48:14,029 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 123 transitions. Word has length 87 [2021-02-23 18:48:14,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:14,030 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 123 transitions. [2021-02-23 18:48:14,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-02-23 18:48:14,030 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 123 transitions. [2021-02-23 18:48:14,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-02-23 18:48:14,031 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:14,031 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:14,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-02-23 18:48:14,032 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:14,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:14,032 INFO L82 PathProgramCache]: Analyzing trace with hash 827502438, now seen corresponding path program 6 times [2021-02-23 18:48:14,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:14,033 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652764547] [2021-02-23 18:48:14,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:14,039 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:14,043 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:14,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:14,110 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,110 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,111 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,111 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,117 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,117 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,121 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,122 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,127 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,127 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,132 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,133 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,138 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,139 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:14,179 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,180 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:14,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652764547] [2021-02-23 18:48:14,189 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:14,189 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-23 18:48:14,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240450235] [2021-02-23 18:48:14,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-23 18:48:14,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:14,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-23 18:48:14,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-02-23 18:48:14,191 INFO L87 Difference]: Start difference. First operand 118 states and 123 transitions. Second operand 8 states. [2021-02-23 18:48:14,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:14,444 INFO L93 Difference]: Finished difference Result 174 states and 183 transitions. [2021-02-23 18:48:14,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-23 18:48:14,445 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 94 [2021-02-23 18:48:14,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:14,449 INFO L225 Difference]: With dead ends: 174 [2021-02-23 18:48:14,449 INFO L226 Difference]: Without dead ends: 130 [2021-02-23 18:48:14,450 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2021-02-23 18:48:14,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-02-23 18:48:14,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 125. [2021-02-23 18:48:14,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2021-02-23 18:48:14,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2021-02-23 18:48:14,462 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 94 [2021-02-23 18:48:14,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:14,464 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2021-02-23 18:48:14,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-23 18:48:14,465 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2021-02-23 18:48:14,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-02-23 18:48:14,467 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:14,467 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:14,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-02-23 18:48:14,468 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:14,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:14,468 INFO L82 PathProgramCache]: Analyzing trace with hash 601458126, now seen corresponding path program 7 times [2021-02-23 18:48:14,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:14,469 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796450771] [2021-02-23 18:48:14,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:14,481 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:14,483 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:14,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:14,570 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,571 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,572 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,573 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,579 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,580 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,585 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,586 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,591 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,591 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,601 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,602 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,612 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,618 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,628 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,634 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:14,643 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,645 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:14,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:14,684 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:14,685 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:14,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:14,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796450771] [2021-02-23 18:48:14,697 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:14,697 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-23 18:48:14,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972859428] [2021-02-23 18:48:14,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-23 18:48:14,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:14,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-23 18:48:14,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-02-23 18:48:14,699 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand 10 states. [2021-02-23 18:48:14,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:14,923 INFO L93 Difference]: Finished difference Result 181 states and 190 transitions. [2021-02-23 18:48:14,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-23 18:48:14,924 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 101 [2021-02-23 18:48:14,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:14,925 INFO L225 Difference]: With dead ends: 181 [2021-02-23 18:48:14,925 INFO L226 Difference]: Without dead ends: 137 [2021-02-23 18:48:14,930 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-02-23 18:48:14,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-02-23 18:48:14,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 132. [2021-02-23 18:48:14,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2021-02-23 18:48:14,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 137 transitions. [2021-02-23 18:48:14,938 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 137 transitions. Word has length 101 [2021-02-23 18:48:14,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:14,939 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 137 transitions. [2021-02-23 18:48:14,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-23 18:48:14,939 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 137 transitions. [2021-02-23 18:48:14,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-02-23 18:48:14,940 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:14,940 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:14,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-02-23 18:48:14,941 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:14,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:14,941 INFO L82 PathProgramCache]: Analyzing trace with hash -577754522, now seen corresponding path program 8 times [2021-02-23 18:48:14,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:14,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284883532] [2021-02-23 18:48:14,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:14,951 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:14,954 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:14,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:15,007 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,008 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:15,009 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,009 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,012 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,013 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,017 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,018 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,023 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,024 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,029 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,030 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,036 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,038 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,046 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,047 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,055 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,056 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,064 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,065 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:15,075 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,076 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:15,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:15,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:15,103 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:15,104 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:15,140 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:15,140 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284883532] [2021-02-23 18:48:15,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:15,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-02-23 18:48:15,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887717190] [2021-02-23 18:48:15,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-23 18:48:15,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:15,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-23 18:48:15,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-02-23 18:48:15,142 INFO L87 Difference]: Start difference. First operand 132 states and 137 transitions. Second operand 12 states. [2021-02-23 18:48:15,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:15,426 INFO L93 Difference]: Finished difference Result 183 states and 192 transitions. [2021-02-23 18:48:15,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-23 18:48:15,427 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 108 [2021-02-23 18:48:15,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:15,428 INFO L225 Difference]: With dead ends: 183 [2021-02-23 18:48:15,428 INFO L226 Difference]: Without dead ends: 139 [2021-02-23 18:48:15,429 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2021-02-23 18:48:15,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-02-23 18:48:15,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-02-23 18:48:15,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2021-02-23 18:48:15,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 144 transitions. [2021-02-23 18:48:15,437 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 144 transitions. Word has length 108 [2021-02-23 18:48:15,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:15,438 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 144 transitions. [2021-02-23 18:48:15,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-02-23 18:48:15,438 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 144 transitions. [2021-02-23 18:48:15,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-02-23 18:48:15,439 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:15,439 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:15,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-02-23 18:48:15,439 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:15,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:15,440 INFO L82 PathProgramCache]: Analyzing trace with hash -645158194, now seen corresponding path program 9 times [2021-02-23 18:48:15,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:15,440 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724040652] [2021-02-23 18:48:15,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:15,447 INFO L84 AcceleratorFastUPR]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2021-02-23 18:48:15,448 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:15,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 18:48:15,477 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 18:48:15,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 18:48:15,501 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 18:48:15,541 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 18:48:15,541 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 18:48:15,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-02-23 18:48:15,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 06:48:15 BoogieIcfgContainer [2021-02-23 18:48:15,563 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 18:48:15,564 INFO L168 Benchmark]: Toolchain (without parser) took 5651.19 ms. Allocated memory was 162.5 MB in the beginning and 195.0 MB in the end (delta: 32.5 MB). Free memory was 137.8 MB in the beginning and 102.3 MB in the end (delta: 35.5 MB). Peak memory consumption was 69.4 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:15,565 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 162.5 MB. Free memory is still 139.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 18:48:15,565 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.87 ms. Allocated memory is still 162.5 MB. Free memory was 136.7 MB in the beginning and 126.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:15,566 INFO L168 Benchmark]: Boogie Preprocessor took 43.75 ms. Allocated memory is still 162.5 MB. Free memory was 126.5 MB in the beginning and 124.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:15,566 INFO L168 Benchmark]: RCFGBuilder took 564.78 ms. Allocated memory is still 162.5 MB. Free memory was 124.5 MB in the beginning and 99.1 MB in the end (delta: 25.4 MB). Peak memory consumption was 25.2 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:15,567 INFO L168 Benchmark]: TraceAbstraction took 4771.76 ms. Allocated memory was 162.5 MB in the beginning and 195.0 MB in the end (delta: 32.5 MB). Free memory was 98.6 MB in the beginning and 102.3 MB in the end (delta: -3.7 MB). Peak memory consumption was 29.6 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:15,569 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 162.5 MB. Free memory is still 139.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 254.87 ms. Allocated memory is still 162.5 MB. Free memory was 136.7 MB in the beginning and 126.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 43.75 ms. Allocated memory is still 162.5 MB. Free memory was 126.5 MB in the beginning and 124.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 564.78 ms. Allocated memory is still 162.5 MB. Free memory was 124.5 MB in the beginning and 99.1 MB in the end (delta: 25.4 MB). Peak memory consumption was 25.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4771.76 ms. Allocated memory was 162.5 MB in the beginning and 195.0 MB in the end (delta: 32.5 MB). Free memory was 98.6 MB in the beginning and 102.3 MB in the end (delta: -3.7 MB). Peak memory consumption was 29.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)<