/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 22:50:51,778 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 22:50:51,780 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 22:50:51,811 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 22:50:51,811 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 22:50:51,813 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 22:50:51,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 22:50:51,819 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 22:50:51,821 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 22:50:51,824 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 22:50:51,825 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 22:50:51,826 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 22:50:51,826 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 22:50:51,834 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 22:50:51,835 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 22:50:51,837 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 22:50:51,838 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 22:50:51,839 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 22:50:51,841 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 22:50:51,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 22:50:51,846 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 22:50:51,847 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 22:50:51,848 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 22:50:51,849 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 22:50:51,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 22:50:51,854 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 22:50:51,854 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 22:50:51,855 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 22:50:51,856 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 22:50:51,856 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 22:50:51,856 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 22:50:51,858 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 22:50:51,859 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 22:50:51,860 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 22:50:51,861 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 22:50:51,861 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 22:50:51,861 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 22:50:51,862 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 22:50:51,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 22:50:51,862 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 22:50:51,863 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 22:50:51,866 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 22:50:51,880 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 22:50:51,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 22:50:51,882 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 22:50:51,882 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 22:50:51,882 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 22:50:51,882 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 22:50:51,883 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 22:50:51,883 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 22:50:51,883 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 22:50:51,883 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 22:50:51,883 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 22:50:51,884 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 22:50:51,884 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 22:50:51,884 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 22:50:51,884 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 22:50:51,884 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 22:50:51,884 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 22:50:51,885 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 22:50:51,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 22:50:51,885 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 22:50:51,885 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 22:50:51,886 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 22:50:51,886 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 22:50:52,160 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 22:50:52,176 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 22:50:52,178 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 22:50:52,178 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 22:50:52,189 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 22:50:52,189 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c [2021-05-02 22:50:52,237 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce2baf88/bd52ba85f37c47a8a93c29807d16648c/FLAGfcc7c4e61 [2021-05-02 22:50:52,591 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 22:50:52,591 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c [2021-05-02 22:50:52,596 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce2baf88/bd52ba85f37c47a8a93c29807d16648c/FLAGfcc7c4e61 [2021-05-02 22:50:52,610 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce2baf88/bd52ba85f37c47a8a93c29807d16648c [2021-05-02 22:50:52,612 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 22:50:52,614 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 22:50:52,617 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 22:50:52,617 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 22:50:52,620 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 22:50:52,620 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40980767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52, skipping insertion in model container [2021-05-02 22:50:52,621 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,625 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 22:50:52,637 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 22:50:52,753 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c[520,533] [2021-05-02 22:50:52,767 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 22:50:52,773 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 22:50:52,816 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c[520,533] [2021-05-02 22:50:52,828 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 22:50:52,839 INFO L208 MainTranslator]: Completed translation [2021-05-02 22:50:52,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52 WrapperNode [2021-05-02 22:50:52,840 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 22:50:52,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 22:50:52,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 22:50:52,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 22:50:52,849 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,855 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,867 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,869 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... [2021-05-02 22:50:52,874 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 22:50:52,875 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 22:50:52,875 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 22:50:52,875 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 22:50:52,876 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 22:50:52,930 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 22:50:52,930 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 22:50:52,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 22:50:52,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 22:50:52,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 22:50:52,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 22:50:52,932 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 22:50:52,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 22:50:53,120 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 22:50:53,120 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 22:50:53,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 10:50:53 BoogieIcfgContainer [2021-05-02 22:50:53,121 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 22:50:53,121 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 22:50:53,121 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 22:50:53,122 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 22:50:53,124 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 10:50:53" (1/1) ... [2021-05-02 22:50:53,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 10:50:53 BasicIcfg [2021-05-02 22:50:53,135 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 22:50:53,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 22:50:53,136 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 22:50:53,137 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 22:50:53,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 10:50:52" (1/4) ... [2021-05-02 22:50:53,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ce2437f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 10:50:53, skipping insertion in model container [2021-05-02 22:50:53,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 10:50:52" (2/4) ... [2021-05-02 22:50:53,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ce2437f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 10:50:53, skipping insertion in model container [2021-05-02 22:50:53,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 10:50:53" (3/4) ... [2021-05-02 22:50:53,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ce2437f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 10:50:53, skipping insertion in model container [2021-05-02 22:50:53,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 10:50:53" (4/4) ... [2021-05-02 22:50:53,140 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound2.cJordan [2021-05-02 22:50:53,143 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 22:50:53,146 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 22:50:53,157 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 22:50:53,169 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 22:50:53,169 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 22:50:53,169 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 22:50:53,169 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 22:50:53,170 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 22:50:53,170 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 22:50:53,170 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 22:50:53,170 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 22:50:53,180 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 22:50:53,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 22:50:53,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:53,186 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:53,186 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:53,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:53,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1238828824, now seen corresponding path program 1 times [2021-05-02 22:50:53,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:53,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810313935] [2021-05-02 22:50:53,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:53,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:53,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 22:50:53,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:53,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 22:50:53,429 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:53,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810313935] [2021-05-02 22:50:53,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810313935] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 22:50:53,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 22:50:53,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 22:50:53,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851044740] [2021-05-02 22:50:53,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 22:50:53,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:53,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 22:50:53,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 22:50:53,449 INFO L87 Difference]: Start difference. First operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:53,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:53,597 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 22:50:53,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 22:50:53,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 22:50:53,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:53,609 INFO L225 Difference]: With dead ends: 27 [2021-05-02 22:50:53,609 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 22:50:53,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 22:50:53,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 22:50:53,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 22:50:53,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 22:50:53,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-05-02 22:50:53,689 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-05-02 22:50:53,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:53,689 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-05-02 22:50:53,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:53,690 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-05-02 22:50:53,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 22:50:53,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:53,691 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:53,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 22:50:53,691 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:53,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:53,694 INFO L82 PathProgramCache]: Analyzing trace with hash -221581531, now seen corresponding path program 1 times [2021-05-02 22:50:53,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:53,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500260892] [2021-05-02 22:50:53,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:53,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:53,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 22:50:53,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:53,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 22:50:53,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:53,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500260892] [2021-05-02 22:50:53,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500260892] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 22:50:53,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 22:50:53,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 22:50:53,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246211824] [2021-05-02 22:50:53,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 22:50:53,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:53,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 22:50:53,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 22:50:53,860 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:53,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:53,996 INFO L93 Difference]: Finished difference Result 23 states and 29 transitions. [2021-05-02 22:50:53,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 22:50:53,997 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 22:50:53,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:53,998 INFO L225 Difference]: With dead ends: 23 [2021-05-02 22:50:53,999 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 22:50:53,999 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 91.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 22:50:54,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 22:50:54,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 22:50:54,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 22:50:54,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-05-02 22:50:54,006 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 12 [2021-05-02 22:50:54,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:54,006 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-05-02 22:50:54,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:54,007 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-05-02 22:50:54,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 22:50:54,007 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:54,007 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:54,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 22:50:54,008 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:54,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:54,009 INFO L82 PathProgramCache]: Analyzing trace with hash -220509055, now seen corresponding path program 1 times [2021-05-02 22:50:54,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:54,011 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449338504] [2021-05-02 22:50:54,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:54,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:54,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 22:50:54,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:54,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 22:50:54,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:54,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449338504] [2021-05-02 22:50:54,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449338504] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 22:50:54,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 22:50:54,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 22:50:54,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675046955] [2021-05-02 22:50:54,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 22:50:54,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:54,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 22:50:54,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 22:50:54,108 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:54,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:54,340 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-05-02 22:50:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 22:50:54,341 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 22:50:54,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:54,342 INFO L225 Difference]: With dead ends: 34 [2021-05-02 22:50:54,342 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 22:50:54,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 146.5ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 22:50:54,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 22:50:54,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-02 22:50:54,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 22:50:54,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 22:50:54,354 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 22:50:54,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:54,354 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 22:50:54,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 22:50:54,355 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 22:50:54,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 22:50:54,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:54,355 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:54,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 22:50:54,355 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:54,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:54,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1748396925, now seen corresponding path program 1 times [2021-05-02 22:50:54,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:54,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139006299] [2021-05-02 22:50:54,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:54,374 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:54,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [269557316] [2021-05-02 22:50:54,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:54,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:54,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 22:50:54,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:54,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 22:50:54,555 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:54,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139006299] [2021-05-02 22:50:54,555 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:54,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269557316] [2021-05-02 22:50:54,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269557316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:54,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:54,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 22:50:54,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387194730] [2021-05-02 22:50:54,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 22:50:54,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:54,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 22:50:54,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 22:50:54,556 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 22:50:54,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:54,656 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2021-05-02 22:50:54,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 22:50:54,657 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 22:50:54,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:54,658 INFO L225 Difference]: With dead ends: 38 [2021-05-02 22:50:54,658 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 22:50:54,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 50.1ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 22:50:54,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 22:50:54,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 22:50:54,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 22:50:54,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-05-02 22:50:54,669 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 17 [2021-05-02 22:50:54,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:54,669 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-05-02 22:50:54,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 22:50:54,669 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-05-02 22:50:54,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 22:50:54,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:54,670 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:54,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:54,881 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:54,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:54,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1697115236, now seen corresponding path program 1 times [2021-05-02 22:50:54,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:54,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097336837] [2021-05-02 22:50:54,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:54,891 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:54,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [783206833] [2021-05-02 22:50:54,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:54,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:54,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 22:50:54,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:54,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:54,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:54,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:54,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:54,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:54,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:55,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:55,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:55,048 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 22:50:55,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:55,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097336837] [2021-05-02 22:50:55,048 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:55,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783206833] [2021-05-02 22:50:55,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783206833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:55,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:55,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 22:50:55,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166535689] [2021-05-02 22:50:55,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 22:50:55,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:55,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 22:50:55,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 22:50:55,050 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 22:50:55,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:55,085 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2021-05-02 22:50:55,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 22:50:55,086 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 22:50:55,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:55,087 INFO L225 Difference]: With dead ends: 37 [2021-05-02 22:50:55,087 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 22:50:55,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 23.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 22:50:55,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 22:50:55,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 22:50:55,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 22:50:55,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-02 22:50:55,090 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 30 [2021-05-02 22:50:55,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:55,090 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-02 22:50:55,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 22:50:55,091 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-02 22:50:55,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 22:50:55,091 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:55,091 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:55,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:55,296 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:55,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:55,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1698187712, now seen corresponding path program 1 times [2021-05-02 22:50:55,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:55,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424240952] [2021-05-02 22:50:55,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:55,302 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:55,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1934716723] [2021-05-02 22:50:55,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:55,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:55,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 22:50:55,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:55,455 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 22:50:55,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:55,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424240952] [2021-05-02 22:50:55,455 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:55,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934716723] [2021-05-02 22:50:55,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934716723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:55,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:55,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 22:50:55,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015152150] [2021-05-02 22:50:55,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 22:50:55,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:55,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 22:50:55,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 22:50:55,456 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 22:50:55,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:55,507 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2021-05-02 22:50:55,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 22:50:55,508 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 22:50:55,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:55,508 INFO L225 Difference]: With dead ends: 48 [2021-05-02 22:50:55,509 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 22:50:55,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 22:50:55,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 22:50:55,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 22:50:55,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 22:50:55,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2021-05-02 22:50:55,520 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 30 [2021-05-02 22:50:55,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:55,520 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2021-05-02 22:50:55,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 22:50:55,521 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2021-05-02 22:50:55,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 22:50:55,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:55,522 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:55,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:55,741 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:55,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:55,742 INFO L82 PathProgramCache]: Analyzing trace with hash 888200606, now seen corresponding path program 2 times [2021-05-02 22:50:55,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:55,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251249615] [2021-05-02 22:50:55,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:55,747 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:55,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [9750183] [2021-05-02 22:50:55,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:55,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 22:50:55,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 22:50:55,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 22:50:55,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:55,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:55,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:55,955 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 22:50:55,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:55,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251249615] [2021-05-02 22:50:55,956 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:55,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9750183] [2021-05-02 22:50:55,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9750183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:55,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:55,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 22:50:55,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216363586] [2021-05-02 22:50:55,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 22:50:55,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:55,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 22:50:55,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 22:50:55,957 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 22:50:56,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:56,116 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2021-05-02 22:50:56,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 22:50:56,117 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-05-02 22:50:56,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:56,117 INFO L225 Difference]: With dead ends: 52 [2021-05-02 22:50:56,117 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 22:50:56,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 68.7ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 22:50:56,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 22:50:56,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 22:50:56,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 14 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 22:50:56,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-05-02 22:50:56,121 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-05-02 22:50:56,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:56,121 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-05-02 22:50:56,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 22:50:56,121 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-05-02 22:50:56,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 22:50:56,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:56,122 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:56,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:56,325 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:56,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:56,325 INFO L82 PathProgramCache]: Analyzing trace with hash 2014164963, now seen corresponding path program 2 times [2021-05-02 22:50:56,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:56,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773639408] [2021-05-02 22:50:56,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:56,331 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:56,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1783517303] [2021-05-02 22:50:56,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:56,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 22:50:56,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 22:50:56,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 22:50:56,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:56,523 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 22:50:56,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:56,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773639408] [2021-05-02 22:50:56,524 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:56,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783517303] [2021-05-02 22:50:56,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783517303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:56,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:56,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 22:50:56,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124458057] [2021-05-02 22:50:56,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 22:50:56,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:56,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 22:50:56,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 22:50:56,525 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 22:50:56,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:56,606 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2021-05-02 22:50:56,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 22:50:56,606 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 48 [2021-05-02 22:50:56,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:56,607 INFO L225 Difference]: With dead ends: 62 [2021-05-02 22:50:56,607 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 22:50:56,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.8ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 22:50:56,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 22:50:56,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2021-05-02 22:50:56,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 22:50:56,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 73 transitions. [2021-05-02 22:50:56,611 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 73 transitions. Word has length 48 [2021-05-02 22:50:56,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:56,611 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 73 transitions. [2021-05-02 22:50:56,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 22:50:56,611 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 73 transitions. [2021-05-02 22:50:56,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 22:50:56,612 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:56,612 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:56,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:56,821 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:56,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:56,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1875813980, now seen corresponding path program 1 times [2021-05-02 22:50:56,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:56,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311818869] [2021-05-02 22:50:56,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:56,830 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:56,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [262315891] [2021-05-02 22:50:56,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:56,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:56,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 22:50:56,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:57,016 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 22 proven. 20 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 22:50:57,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:57,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311818869] [2021-05-02 22:50:57,017 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:57,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262315891] [2021-05-02 22:50:57,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262315891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:57,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:57,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 22:50:57,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156540571] [2021-05-02 22:50:57,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 22:50:57,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:57,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 22:50:57,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 22:50:57,020 INFO L87 Difference]: Start difference. First operand 60 states and 73 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 22:50:57,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:57,163 INFO L93 Difference]: Finished difference Result 66 states and 79 transitions. [2021-05-02 22:50:57,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 22:50:57,163 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-02 22:50:57,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:57,164 INFO L225 Difference]: With dead ends: 66 [2021-05-02 22:50:57,164 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 22:50:57,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 55.7ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 22:50:57,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 22:50:57,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 22:50:57,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 37 states have (on average 1.135135135135135) internal successors, (42), 39 states have internal predecessors, (42), 19 states have call successors, (19), 9 states have call predecessors, (19), 8 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 22:50:57,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-05-02 22:50:57,168 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 53 [2021-05-02 22:50:57,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:57,169 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-05-02 22:50:57,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 22:50:57,169 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-05-02 22:50:57,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 22:50:57,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:57,170 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:57,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:57,385 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:57,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:57,385 INFO L82 PathProgramCache]: Analyzing trace with hash 462495009, now seen corresponding path program 1 times [2021-05-02 22:50:57,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:57,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807929024] [2021-05-02 22:50:57,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:57,391 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:57,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1305260683] [2021-05-02 22:50:57,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:57,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 22:50:57,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 22:50:57,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:57,614 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 24 proven. 23 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 22:50:57,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:57,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807929024] [2021-05-02 22:50:57,615 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:57,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305260683] [2021-05-02 22:50:57,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305260683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:57,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:57,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 22:50:57,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913297653] [2021-05-02 22:50:57,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 22:50:57,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:57,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 22:50:57,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 22:50:57,618 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 22:50:57,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:57,746 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2021-05-02 22:50:57,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 22:50:57,747 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 58 [2021-05-02 22:50:57,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:57,748 INFO L225 Difference]: With dead ends: 70 [2021-05-02 22:50:57,748 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 22:50:57,748 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 56.6ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 22:50:57,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 22:50:57,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 22:50:57,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 40 states have (on average 1.075) internal successors, (43), 41 states have internal predecessors, (43), 17 states have call successors, (17), 10 states have call predecessors, (17), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 22:50:57,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 22:50:57,751 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 58 [2021-05-02 22:50:57,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:57,752 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 22:50:57,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 22:50:57,752 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 22:50:57,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 22:50:57,752 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 22:50:57,752 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 22:50:57,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 22:50:57,963 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 22:50:57,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 22:50:57,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1631764062, now seen corresponding path program 3 times [2021-05-02 22:50:57,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 22:50:57,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193008214] [2021-05-02 22:50:57,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 22:50:57,968 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 22:50:57,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1648031641] [2021-05-02 22:50:57,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 22:50:58,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 22:50:58,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 22:50:58,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 22:50:58,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 22:50:58,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 22:50:58,125 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 22:50:58,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 22:50:58,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193008214] [2021-05-02 22:50:58,126 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 22:50:58,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648031641] [2021-05-02 22:50:58,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648031641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 22:50:58,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 22:50:58,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 22:50:58,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181166274] [2021-05-02 22:50:58,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 22:50:58,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 22:50:58,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 22:50:58,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 22:50:58,127 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 22:50:58,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 22:50:58,154 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-05-02 22:50:58,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 22:50:58,155 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 66 [2021-05-02 22:50:58,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 22:50:58,155 INFO L225 Difference]: With dead ends: 36 [2021-05-02 22:50:58,155 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 22:50:58,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 13.2ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 22:50:58,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 22:50:58,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 22:50:58,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 22:50:58,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 22:50:58,156 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 66 [2021-05-02 22:50:58,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 22:50:58,156 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 22:50:58,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 22:50:58,156 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 22:50:58,156 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 22:50:58,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 22:50:58,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 10:50:58 BasicIcfg [2021-05-02 22:50:58,360 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 22:50:58,360 INFO L168 Benchmark]: Toolchain (without parser) took 5746.87 ms. Allocated memory was 217.1 MB in the beginning and 273.7 MB in the end (delta: 56.6 MB). Free memory was 182.2 MB in the beginning and 159.7 MB in the end (delta: 22.4 MB). Peak memory consumption was 79.1 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 217.1 MB. Free memory is still 199.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: CACSL2BoogieTranslator took 222.65 ms. Allocated memory is still 217.1 MB. Free memory was 181.9 MB in the beginning and 200.4 MB in the end (delta: -18.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: Boogie Preprocessor took 32.72 ms. Allocated memory is still 217.1 MB. Free memory was 200.4 MB in the beginning and 198.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: RCFGBuilder took 246.16 ms. Allocated memory is still 217.1 MB. Free memory was 198.8 MB in the beginning and 184.4 MB in the end (delta: 14.4 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: IcfgTransformer took 13.20 ms. Allocated memory is still 217.1 MB. Free memory was 184.3 MB in the beginning and 183.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L168 Benchmark]: TraceAbstraction took 5224.51 ms. Allocated memory was 217.1 MB in the beginning and 273.7 MB in the end (delta: 56.6 MB). Free memory was 182.6 MB in the beginning and 159.7 MB in the end (delta: 22.9 MB). Peak memory consumption was 80.7 MB. Max. memory is 8.0 GB. [2021-05-02 22:50:58,361 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 217.1 MB. Free memory is still 199.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 222.65 ms. Allocated memory is still 217.1 MB. Free memory was 181.9 MB in the beginning and 200.4 MB in the end (delta: -18.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 32.72 ms. Allocated memory is still 217.1 MB. Free memory was 200.4 MB in the beginning and 198.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 246.16 ms. Allocated memory is still 217.1 MB. Free memory was 198.8 MB in the beginning and 184.4 MB in the end (delta: 14.4 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * IcfgTransformer took 13.20 ms. Allocated memory is still 217.1 MB. Free memory was 184.3 MB in the beginning and 183.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5224.51 ms. Allocated memory was 217.1 MB in the beginning and 273.7 MB in the end (delta: 56.6 MB). Free memory was 182.6 MB in the beginning and 159.7 MB in the end (delta: 22.9 MB). Peak memory consumption was 80.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5189.4ms, OverallIterations: 11, TraceHistogramMax: 10, EmptinessCheckTime: 15.5ms, AutomataDifference: 1306.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 307 SDtfs, 107 SDslu, 930 SDs, 0 SdLazy, 870 SolverSat, 102 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 681.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 364 GetRequests, 292 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 607.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=10, InterpolantAutomatonStates: 75, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 88.1ms AutomataMinimizationTime, 11 MinimizatonAttempts, 8 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 78.7ms SsaConstructionTime, 269.7ms SatisfiabilityAnalysisTime, 1350.2ms InterpolantComputationTime, 372 NumberOfCodeBlocks, 357 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 361 ConstructedInterpolants, 0 QuantifiedInterpolants, 1289 SizeOfPredicates, 20 NumberOfNonLiveVariables, 1326 ConjunctsInSsa, 148 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 520/593 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...