./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 10:56:40,500 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 10:56:40,502 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 10:56:40,558 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 10:56:40,558 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 10:56:40,559 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 10:56:40,560 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 10:56:40,562 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 10:56:40,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 10:56:40,564 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 10:56:40,564 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 10:56:40,565 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 10:56:40,565 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 10:56:40,566 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 10:56:40,571 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 10:56:40,573 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 10:56:40,574 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 10:56:40,576 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 10:56:40,578 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 10:56:40,583 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 10:56:40,585 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 10:56:40,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 10:56:40,590 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 10:56:40,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 10:56:40,593 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 10:56:40,596 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 10:56:40,596 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 10:56:40,597 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 10:56:40,598 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 10:56:40,599 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 10:56:40,599 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 10:56:40,600 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 10:56:40,601 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 10:56:40,602 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 10:56:40,604 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 10:56:40,604 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 10:56:40,605 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 10:56:40,605 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 10:56:40,605 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 10:56:40,606 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 10:56:40,607 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 10:56:40,607 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-22 10:56:40,641 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 10:56:40,641 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 10:56:40,642 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 10:56:40,642 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 10:56:40,643 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 10:56:40,643 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 10:56:40,644 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 10:56:40,644 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 10:56:40,645 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 10:56:40,645 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 10:56:40,646 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 10:56:40,646 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 10:56:40,646 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 10:56:40,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 10:56:40,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 10:56:40,647 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 10:56:40,647 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 10:56:40,647 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 10:56:40,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 10:56:40,647 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 10:56:40,648 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 10:56:40,648 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 10:56:40,648 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 10:56:40,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 10:56:40,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 10:56:40,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 10:56:40,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 10:56:40,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 10:56:40,649 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 10:56:40,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 10:56:40,650 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 10:56:40,650 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 10:56:40,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 10:56:40,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 10:56:40,651 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 [2021-12-22 10:56:40,918 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 10:56:40,947 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 10:56:40,949 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 10:56:40,950 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 10:56:40,951 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 10:56:40,952 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2021-12-22 10:56:41,014 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1272bb3b8/5c16823dbdc34956bdabab3654ae3c8b/FLAGf515dd4a0 [2021-12-22 10:56:41,443 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 10:56:41,444 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2021-12-22 10:56:41,455 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1272bb3b8/5c16823dbdc34956bdabab3654ae3c8b/FLAGf515dd4a0 [2021-12-22 10:56:41,836 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1272bb3b8/5c16823dbdc34956bdabab3654ae3c8b [2021-12-22 10:56:41,841 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 10:56:41,843 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 10:56:41,846 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 10:56:41,846 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 10:56:41,849 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 10:56:41,850 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 10:56:41" (1/1) ... [2021-12-22 10:56:41,851 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46e3e778 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:41, skipping insertion in model container [2021-12-22 10:56:41,851 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 10:56:41" (1/1) ... [2021-12-22 10:56:41,857 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 10:56:41,871 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 10:56:41,999 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2021-12-22 10:56:42,019 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 10:56:42,026 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 10:56:42,036 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2021-12-22 10:56:42,051 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 10:56:42,062 INFO L208 MainTranslator]: Completed translation [2021-12-22 10:56:42,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42 WrapperNode [2021-12-22 10:56:42,063 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 10:56:42,064 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 10:56:42,064 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 10:56:42,064 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 10:56:42,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,077 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,097 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2021-12-22 10:56:42,097 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 10:56:42,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 10:56:42,098 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 10:56:42,098 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 10:56:42,105 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,106 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,116 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,121 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,124 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,126 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,127 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 10:56:42,128 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 10:56:42,129 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 10:56:42,129 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 10:56:42,135 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (1/1) ... [2021-12-22 10:56:42,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 10:56:42,153 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:42,163 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 10:56:42,170 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 10:56:42,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 10:56:42,197 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-22 10:56:42,198 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-22 10:56:42,198 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 10:56:42,198 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 10:56:42,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 10:56:42,198 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-22 10:56:42,198 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-22 10:56:42,247 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 10:56:42,249 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 10:56:42,431 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 10:56:42,436 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 10:56:42,437 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-22 10:56:42,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 10:56:42 BoogieIcfgContainer [2021-12-22 10:56:42,439 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 10:56:42,440 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 10:56:42,440 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 10:56:42,443 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 10:56:42,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 10:56:41" (1/3) ... [2021-12-22 10:56:42,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7359a67a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 10:56:42, skipping insertion in model container [2021-12-22 10:56:42,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:56:42" (2/3) ... [2021-12-22 10:56:42,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7359a67a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 10:56:42, skipping insertion in model container [2021-12-22 10:56:42,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 10:56:42" (3/3) ... [2021-12-22 10:56:42,446 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound20.c [2021-12-22 10:56:42,450 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 10:56:42,451 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 10:56:42,489 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 10:56:42,494 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 10:56:42,495 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 10:56:42,508 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 24 states have (on average 1.5) internal successors, (36), 25 states have internal predecessors, (36), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 10:56:42,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-22 10:56:42,511 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:42,512 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:42,512 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:42,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:42,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1663185933, now seen corresponding path program 1 times [2021-12-22 10:56:42,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:42,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856909434] [2021-12-22 10:56:42,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:42,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:42,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:42,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 10:56:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:42,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 10:56:42,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:42,679 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:42,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:42,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856909434] [2021-12-22 10:56:42,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856909434] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:42,683 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:42,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 10:56:42,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179304007] [2021-12-22 10:56:42,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:42,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 10:56:42,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:42,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 10:56:42,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 10:56:42,720 INFO L87 Difference]: Start difference. First operand has 35 states, 24 states have (on average 1.5) internal successors, (36), 25 states have internal predecessors, (36), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 10:56:42,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:42,745 INFO L93 Difference]: Finished difference Result 67 states and 103 transitions. [2021-12-22 10:56:42,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 10:56:42,747 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-12-22 10:56:42,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:42,756 INFO L225 Difference]: With dead ends: 67 [2021-12-22 10:56:42,756 INFO L226 Difference]: Without dead ends: 31 [2021-12-22 10:56:42,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 10:56:42,772 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:42,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:42,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-22 10:56:42,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-12-22 10:56:42,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 10:56:42,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2021-12-22 10:56:42,817 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 18 [2021-12-22 10:56:42,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:42,817 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2021-12-22 10:56:42,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 10:56:42,818 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2021-12-22 10:56:42,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-22 10:56:42,820 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:42,820 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:42,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 10:56:42,821 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:42,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:42,822 INFO L85 PathProgramCache]: Analyzing trace with hash 1013747788, now seen corresponding path program 1 times [2021-12-22 10:56:42,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:42,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688556095] [2021-12-22 10:56:42,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:42,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:42,859 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:42,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1487452000] [2021-12-22 10:56:42,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:42,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:42,864 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:42,871 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:42,914 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 10:56:42,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:42,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 10:56:42,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:43,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:43,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:43,051 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:43,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688556095] [2021-12-22 10:56:43,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:43,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487452000] [2021-12-22 10:56:43,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487452000] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:43,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:43,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 10:56:43,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932411908] [2021-12-22 10:56:43,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:43,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 10:56:43,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:43,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 10:56:43,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 10:56:43,060 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:43,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:43,086 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-12-22 10:56:43,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 10:56:43,089 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-12-22 10:56:43,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:43,091 INFO L225 Difference]: With dead ends: 40 [2021-12-22 10:56:43,091 INFO L226 Difference]: Without dead ends: 33 [2021-12-22 10:56:43,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 10:56:43,094 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:43,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:43,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-22 10:56:43,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-22 10:56:43,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 10:56:43,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-12-22 10:56:43,113 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 19 [2021-12-22 10:56:43,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:43,114 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-12-22 10:56:43,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:43,115 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-12-22 10:56:43,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-22 10:56:43,116 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:43,116 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:43,143 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-22 10:56:43,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:43,341 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:43,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:43,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1341775226, now seen corresponding path program 1 times [2021-12-22 10:56:43,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:43,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932321590] [2021-12-22 10:56:43,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:43,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:43,356 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:43,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1123884960] [2021-12-22 10:56:43,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:43,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:43,359 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:43,360 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:43,363 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 10:56:43,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:43,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 10:56:43,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:43,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:43,532 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:43,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:43,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932321590] [2021-12-22 10:56:43,535 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:43,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123884960] [2021-12-22 10:56:43,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123884960] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:43,535 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:43,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 10:56:43,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233347356] [2021-12-22 10:56:43,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:43,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 10:56:43,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:43,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 10:56:43,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:56:43,537 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:43,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:43,618 INFO L93 Difference]: Finished difference Result 53 states and 71 transitions. [2021-12-22 10:56:43,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 10:56:43,619 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-12-22 10:56:43,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:43,622 INFO L225 Difference]: With dead ends: 53 [2021-12-22 10:56:43,622 INFO L226 Difference]: Without dead ends: 46 [2021-12-22 10:56:43,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-22 10:56:43,625 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 46 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:43,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 149 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:43,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-22 10:56:43,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2021-12-22 10:56:43,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 25 states have internal predecessors, (31), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 10:56:43,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-12-22 10:56:43,643 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 20 [2021-12-22 10:56:43,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:43,643 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-12-22 10:56:43,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:43,644 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-12-22 10:56:43,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 10:56:43,645 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:43,645 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:43,662 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:43,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-22 10:56:43,846 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:43,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:43,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1315139464, now seen corresponding path program 1 times [2021-12-22 10:56:43,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:43,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716615548] [2021-12-22 10:56:43,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:43,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:43,861 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:43,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2072076511] [2021-12-22 10:56:43,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:43,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:43,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:43,866 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:43,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 10:56:43,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:43,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 10:56:43,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:43,974 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:43,975 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:43,975 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:43,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716615548] [2021-12-22 10:56:43,975 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:43,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072076511] [2021-12-22 10:56:43,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072076511] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:43,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:43,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 10:56:43,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862071024] [2021-12-22 10:56:43,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:43,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:56:43,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:43,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:56:43,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:56:43,978 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:44,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:44,004 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2021-12-22 10:56:44,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 10:56:44,004 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2021-12-22 10:56:44,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:44,006 INFO L225 Difference]: With dead ends: 58 [2021-12-22 10:56:44,006 INFO L226 Difference]: Without dead ends: 36 [2021-12-22 10:56:44,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:56:44,008 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 5 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:44,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 103 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:44,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-22 10:56:44,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-22 10:56:44,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 10:56:44,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2021-12-22 10:56:44,023 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 25 [2021-12-22 10:56:44,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:44,026 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2021-12-22 10:56:44,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:44,027 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2021-12-22 10:56:44,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 10:56:44,028 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:44,028 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:44,051 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:44,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:44,243 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:44,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:44,244 INFO L85 PathProgramCache]: Analyzing trace with hash 570907173, now seen corresponding path program 1 times [2021-12-22 10:56:44,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:44,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180187499] [2021-12-22 10:56:44,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:44,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:44,256 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:44,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1048820100] [2021-12-22 10:56:44,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:44,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:44,257 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:44,258 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:44,267 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 10:56:44,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:44,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 10:56:44,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:44,491 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:44,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:44,491 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:44,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180187499] [2021-12-22 10:56:44,492 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:44,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048820100] [2021-12-22 10:56:44,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048820100] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:44,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:44,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-22 10:56:44,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533781490] [2021-12-22 10:56:44,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:44,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 10:56:44,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:44,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 10:56:44,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-22 10:56:44,494 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:44,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:44,579 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2021-12-22 10:56:44,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 10:56:44,580 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2021-12-22 10:56:44,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:44,581 INFO L225 Difference]: With dead ends: 54 [2021-12-22 10:56:44,581 INFO L226 Difference]: Without dead ends: 52 [2021-12-22 10:56:44,598 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-22 10:56:44,599 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 65 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:44,599 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 208 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:44,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-12-22 10:56:44,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-12-22 10:56:44,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 37 states have internal predecessors, (47), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-22 10:56:44,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2021-12-22 10:56:44,606 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 25 [2021-12-22 10:56:44,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:44,606 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2021-12-22 10:56:44,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:44,606 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2021-12-22 10:56:44,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 10:56:44,607 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:44,607 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:44,624 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:44,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:44,811 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:44,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:44,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1698298847, now seen corresponding path program 1 times [2021-12-22 10:56:44,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:44,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081880780] [2021-12-22 10:56:44,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:44,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:44,823 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:44,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [989970114] [2021-12-22 10:56:44,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:44,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:44,825 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:44,826 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:44,827 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 10:56:44,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:44,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 10:56:44,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:44,923 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:44,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:45,011 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:45,011 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:45,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081880780] [2021-12-22 10:56:45,012 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:45,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989970114] [2021-12-22 10:56:45,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989970114] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:45,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:45,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-12-22 10:56:45,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989714525] [2021-12-22 10:56:45,013 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:45,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 10:56:45,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:45,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 10:56:45,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-12-22 10:56:45,014 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:45,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:45,122 INFO L93 Difference]: Finished difference Result 147 states and 193 transitions. [2021-12-22 10:56:45,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 10:56:45,123 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 26 [2021-12-22 10:56:45,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:45,125 INFO L225 Difference]: With dead ends: 147 [2021-12-22 10:56:45,125 INFO L226 Difference]: Without dead ends: 140 [2021-12-22 10:56:45,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-12-22 10:56:45,126 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 94 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:45,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 201 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:45,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-12-22 10:56:45,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 97. [2021-12-22 10:56:45,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 71 states have internal predecessors, (92), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 10:56:45,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 130 transitions. [2021-12-22 10:56:45,146 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 130 transitions. Word has length 26 [2021-12-22 10:56:45,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:45,147 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 130 transitions. [2021-12-22 10:56:45,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:45,147 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 130 transitions. [2021-12-22 10:56:45,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-22 10:56:45,148 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:45,148 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:45,173 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:45,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:45,367 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:45,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:45,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1127291835, now seen corresponding path program 1 times [2021-12-22 10:56:45,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:45,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088150691] [2021-12-22 10:56:45,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:45,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:45,378 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:45,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [401424802] [2021-12-22 10:56:45,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:45,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:45,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:45,380 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:45,415 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 10:56:45,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:45,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-22 10:56:45,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:45,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:45,634 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:45,635 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:45,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088150691] [2021-12-22 10:56:45,635 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:45,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401424802] [2021-12-22 10:56:45,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401424802] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:45,635 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:45,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-22 10:56:45,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928329269] [2021-12-22 10:56:45,636 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:45,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 10:56:45,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:45,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 10:56:45,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-22 10:56:45,637 INFO L87 Difference]: Start difference. First operand 97 states and 130 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 10:56:45,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:45,843 INFO L93 Difference]: Finished difference Result 183 states and 261 transitions. [2021-12-22 10:56:45,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-22 10:56:45,843 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-12-22 10:56:45,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:45,845 INFO L225 Difference]: With dead ends: 183 [2021-12-22 10:56:45,845 INFO L226 Difference]: Without dead ends: 171 [2021-12-22 10:56:45,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-12-22 10:56:45,846 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 113 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:45,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 333 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:45,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-12-22 10:56:45,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 128. [2021-12-22 10:56:45,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 97 states have (on average 1.3505154639175259) internal successors, (131), 98 states have internal predecessors, (131), 23 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-22 10:56:45,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 176 transitions. [2021-12-22 10:56:45,866 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 176 transitions. Word has length 27 [2021-12-22 10:56:45,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:45,866 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 176 transitions. [2021-12-22 10:56:45,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 10:56:45,866 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 176 transitions. [2021-12-22 10:56:45,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 10:56:45,867 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:45,867 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:45,892 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:46,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:46,083 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:46,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:46,083 INFO L85 PathProgramCache]: Analyzing trace with hash -200071253, now seen corresponding path program 1 times [2021-12-22 10:56:46,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:46,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615900064] [2021-12-22 10:56:46,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:46,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:46,094 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:46,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1916362455] [2021-12-22 10:56:46,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:46,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:46,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:46,096 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:46,097 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 10:56:46,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:46,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-22 10:56:46,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:46,393 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:46,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:46,393 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:46,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615900064] [2021-12-22 10:56:46,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:46,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916362455] [2021-12-22 10:56:46,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916362455] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:46,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:46,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-22 10:56:46,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138822823] [2021-12-22 10:56:46,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:46,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 10:56:46,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:46,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 10:56:46,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-22 10:56:46,396 INFO L87 Difference]: Start difference. First operand 128 states and 176 transitions. Second operand has 11 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 10:56:46,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:46,610 INFO L93 Difference]: Finished difference Result 153 states and 206 transitions. [2021-12-22 10:56:46,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 10:56:46,611 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2021-12-22 10:56:46,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:46,613 INFO L225 Difference]: With dead ends: 153 [2021-12-22 10:56:46,613 INFO L226 Difference]: Without dead ends: 151 [2021-12-22 10:56:46,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-12-22 10:56:46,614 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 100 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:46,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 241 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:46,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-12-22 10:56:46,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 140. [2021-12-22 10:56:46,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 106 states have (on average 1.320754716981132) internal successors, (140), 107 states have internal predecessors, (140), 23 states have call successors, (23), 10 states have call predecessors, (23), 10 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-22 10:56:46,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 185 transitions. [2021-12-22 10:56:46,652 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 185 transitions. Word has length 30 [2021-12-22 10:56:46,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:46,653 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 185 transitions. [2021-12-22 10:56:46,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 10:56:46,653 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 185 transitions. [2021-12-22 10:56:46,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-22 10:56:46,654 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:46,654 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:46,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:46,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:46,878 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:46,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:46,878 INFO L85 PathProgramCache]: Analyzing trace with hash 164485690, now seen corresponding path program 1 times [2021-12-22 10:56:46,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:46,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018328661] [2021-12-22 10:56:46,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:46,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:46,888 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:46,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [785805285] [2021-12-22 10:56:46,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:46,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:46,889 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:46,896 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:46,900 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-22 10:56:46,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:46,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-22 10:56:46,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:47,174 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:56:47,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:47,279 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:47,280 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:47,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018328661] [2021-12-22 10:56:47,280 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:47,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785805285] [2021-12-22 10:56:47,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785805285] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:47,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:47,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 12 [2021-12-22 10:56:47,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589679798] [2021-12-22 10:56:47,283 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:47,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 10:56:47,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:47,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 10:56:47,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-12-22 10:56:47,285 INFO L87 Difference]: Start difference. First operand 140 states and 185 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:47,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:47,512 INFO L93 Difference]: Finished difference Result 183 states and 251 transitions. [2021-12-22 10:56:47,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 10:56:47,513 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-12-22 10:56:47,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:47,514 INFO L225 Difference]: With dead ends: 183 [2021-12-22 10:56:47,514 INFO L226 Difference]: Without dead ends: 181 [2021-12-22 10:56:47,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-12-22 10:56:47,515 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 80 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:47,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 392 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:47,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-12-22 10:56:47,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 170. [2021-12-22 10:56:47,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.3464566929133859) internal successors, (171), 128 states have internal predecessors, (171), 31 states have call successors, (31), 11 states have call predecessors, (31), 11 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-12-22 10:56:47,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 232 transitions. [2021-12-22 10:56:47,534 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 232 transitions. Word has length 32 [2021-12-22 10:56:47,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:47,534 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 232 transitions. [2021-12-22 10:56:47,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:47,535 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 232 transitions. [2021-12-22 10:56:47,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-22 10:56:47,536 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:47,536 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:47,559 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-22 10:56:47,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-22 10:56:47,753 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:47,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:47,754 INFO L85 PathProgramCache]: Analyzing trace with hash 1985711111, now seen corresponding path program 1 times [2021-12-22 10:56:47,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:47,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688714320] [2021-12-22 10:56:47,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:47,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:47,764 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:47,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059556578] [2021-12-22 10:56:47,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:47,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:47,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:47,766 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:47,767 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-22 10:56:47,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:47,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 10:56:47,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:47,865 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:47,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:47,865 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:47,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688714320] [2021-12-22 10:56:47,865 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:47,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059556578] [2021-12-22 10:56:47,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059556578] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:47,865 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:47,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:56:47,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015912338] [2021-12-22 10:56:47,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:47,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 10:56:47,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:47,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 10:56:47,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:56:47,867 INFO L87 Difference]: Start difference. First operand 170 states and 232 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:47,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:47,901 INFO L93 Difference]: Finished difference Result 237 states and 325 transitions. [2021-12-22 10:56:47,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 10:56:47,902 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2021-12-22 10:56:47,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:47,905 INFO L225 Difference]: With dead ends: 237 [2021-12-22 10:56:47,905 INFO L226 Difference]: Without dead ends: 170 [2021-12-22 10:56:47,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:56:47,908 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 14 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:47,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 130 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:47,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-12-22 10:56:47,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2021-12-22 10:56:47,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.3385826771653544) internal successors, (170), 128 states have internal predecessors, (170), 31 states have call successors, (31), 11 states have call predecessors, (31), 11 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-12-22 10:56:47,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 231 transitions. [2021-12-22 10:56:47,926 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 231 transitions. Word has length 32 [2021-12-22 10:56:47,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:47,927 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 231 transitions. [2021-12-22 10:56:47,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:47,927 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 231 transitions. [2021-12-22 10:56:47,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-22 10:56:47,931 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:47,931 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:47,958 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:48,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-22 10:56:48,151 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:48,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:48,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1730540965, now seen corresponding path program 1 times [2021-12-22 10:56:48,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:48,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761949343] [2021-12-22 10:56:48,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:48,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:48,160 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:48,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [310466159] [2021-12-22 10:56:48,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:48,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:48,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:48,162 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:48,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-22 10:56:48,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:48,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 10:56:48,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 10:56:48,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:48,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:48,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761949343] [2021-12-22 10:56:48,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:48,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310466159] [2021-12-22 10:56:48,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310466159] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:48,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:48,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:56:48,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624736674] [2021-12-22 10:56:48,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:48,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:56:48,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:48,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:56:48,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:56:48,297 INFO L87 Difference]: Start difference. First operand 170 states and 231 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:48,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:48,360 INFO L93 Difference]: Finished difference Result 235 states and 331 transitions. [2021-12-22 10:56:48,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 10:56:48,361 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-12-22 10:56:48,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:48,362 INFO L225 Difference]: With dead ends: 235 [2021-12-22 10:56:48,362 INFO L226 Difference]: Without dead ends: 233 [2021-12-22 10:56:48,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:56:48,363 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 10 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:48,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 139 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:48,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-12-22 10:56:48,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 226. [2021-12-22 10:56:48,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 160 states have (on average 1.36875) internal successors, (219), 161 states have internal predecessors, (219), 51 states have call successors, (51), 14 states have call predecessors, (51), 14 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2021-12-22 10:56:48,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 320 transitions. [2021-12-22 10:56:48,384 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 320 transitions. Word has length 35 [2021-12-22 10:56:48,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:48,385 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 320 transitions. [2021-12-22 10:56:48,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:48,385 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 320 transitions. [2021-12-22 10:56:48,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 10:56:48,386 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:48,386 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:48,410 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:48,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-22 10:56:48,607 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:48,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:48,608 INFO L85 PathProgramCache]: Analyzing trace with hash -2009961290, now seen corresponding path program 1 times [2021-12-22 10:56:48,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:48,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318559906] [2021-12-22 10:56:48,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:48,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:48,616 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:48,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2995120] [2021-12-22 10:56:48,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:48,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:48,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:48,617 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:48,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-22 10:56:48,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:48,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-22 10:56:48,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:48,922 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:48,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:49,031 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:49,031 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:49,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318559906] [2021-12-22 10:56:49,032 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:49,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2995120] [2021-12-22 10:56:49,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2995120] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:49,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:49,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-12-22 10:56:49,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037934216] [2021-12-22 10:56:49,033 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:49,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 10:56:49,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:49,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 10:56:49,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-12-22 10:56:49,034 INFO L87 Difference]: Start difference. First operand 226 states and 320 transitions. Second operand has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 10:56:49,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:49,870 INFO L93 Difference]: Finished difference Result 388 states and 574 transitions. [2021-12-22 10:56:49,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 10:56:49,871 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-12-22 10:56:49,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:49,873 INFO L225 Difference]: With dead ends: 388 [2021-12-22 10:56:49,873 INFO L226 Difference]: Without dead ends: 386 [2021-12-22 10:56:49,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-12-22 10:56:49,874 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 168 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:49,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 344 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-22 10:56:49,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-12-22 10:56:49,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 373. [2021-12-22 10:56:49,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 265 states have (on average 1.4264150943396225) internal successors, (378), 266 states have internal predecessors, (378), 91 states have call successors, (91), 16 states have call predecessors, (91), 16 states have return successors, (90), 90 states have call predecessors, (90), 90 states have call successors, (90) [2021-12-22 10:56:49,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 559 transitions. [2021-12-22 10:56:49,914 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 559 transitions. Word has length 37 [2021-12-22 10:56:49,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:49,914 INFO L470 AbstractCegarLoop]: Abstraction has 373 states and 559 transitions. [2021-12-22 10:56:49,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 10:56:49,914 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 559 transitions. [2021-12-22 10:56:49,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-22 10:56:49,915 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:49,915 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:49,940 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:50,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-22 10:56:50,131 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:50,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:50,132 INFO L85 PathProgramCache]: Analyzing trace with hash -1954288725, now seen corresponding path program 1 times [2021-12-22 10:56:50,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:50,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513806222] [2021-12-22 10:56:50,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:50,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:50,148 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:50,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1108445975] [2021-12-22 10:56:50,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:50,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:50,148 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:50,155 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:50,156 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-22 10:56:50,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:50,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 10:56:50,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:50,282 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-22 10:56:50,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:50,283 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:50,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513806222] [2021-12-22 10:56:50,283 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:50,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108445975] [2021-12-22 10:56:50,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108445975] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:50,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:50,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:56:50,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421162832] [2021-12-22 10:56:50,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:50,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:56:50,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:50,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:56:50,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:56:50,285 INFO L87 Difference]: Start difference. First operand 373 states and 559 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 10:56:50,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:50,391 INFO L93 Difference]: Finished difference Result 562 states and 883 transitions. [2021-12-22 10:56:50,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 10:56:50,391 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 40 [2021-12-22 10:56:50,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:50,394 INFO L225 Difference]: With dead ends: 562 [2021-12-22 10:56:50,394 INFO L226 Difference]: Without dead ends: 560 [2021-12-22 10:56:50,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:56:50,395 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 12 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:50,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 156 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:50,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-12-22 10:56:50,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 491. [2021-12-22 10:56:50,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 306 states have (on average 1.4281045751633987) internal successors, (437), 326 states have internal predecessors, (437), 167 states have call successors, (167), 17 states have call predecessors, (167), 17 states have return successors, (166), 147 states have call predecessors, (166), 166 states have call successors, (166) [2021-12-22 10:56:50,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 770 transitions. [2021-12-22 10:56:50,470 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 770 transitions. Word has length 40 [2021-12-22 10:56:50,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:50,470 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 770 transitions. [2021-12-22 10:56:50,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 10:56:50,470 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 770 transitions. [2021-12-22 10:56:50,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-22 10:56:50,471 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:50,471 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:50,496 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:50,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-22 10:56:50,687 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:50,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:50,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1977082887, now seen corresponding path program 1 times [2021-12-22 10:56:50,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:50,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557079198] [2021-12-22 10:56:50,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:50,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:50,695 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:50,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1583085254] [2021-12-22 10:56:50,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:50,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:50,695 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:50,696 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:50,697 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-22 10:56:50,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:50,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-22 10:56:50,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:50,831 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-22 10:56:50,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:50,941 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-22 10:56:50,941 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:50,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557079198] [2021-12-22 10:56:50,941 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:50,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583085254] [2021-12-22 10:56:50,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583085254] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:50,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:50,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-12-22 10:56:50,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789181725] [2021-12-22 10:56:50,943 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:50,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 10:56:50,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:50,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 10:56:50,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-12-22 10:56:50,944 INFO L87 Difference]: Start difference. First operand 491 states and 770 transitions. Second operand has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:51,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:51,194 INFO L93 Difference]: Finished difference Result 1123 states and 1717 transitions. [2021-12-22 10:56:51,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-22 10:56:51,195 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 38 [2021-12-22 10:56:51,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:51,201 INFO L225 Difference]: With dead ends: 1123 [2021-12-22 10:56:51,201 INFO L226 Difference]: Without dead ends: 766 [2021-12-22 10:56:51,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=179, Unknown=0, NotChecked=0, Total=272 [2021-12-22 10:56:51,203 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 131 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:51,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 292 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:56:51,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2021-12-22 10:56:51,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 732. [2021-12-22 10:56:51,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 732 states, 470 states have (on average 1.3638297872340426) internal successors, (641), 494 states have internal predecessors, (641), 222 states have call successors, (222), 39 states have call predecessors, (222), 39 states have return successors, (218), 198 states have call predecessors, (218), 218 states have call successors, (218) [2021-12-22 10:56:51,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 732 states to 732 states and 1081 transitions. [2021-12-22 10:56:51,295 INFO L78 Accepts]: Start accepts. Automaton has 732 states and 1081 transitions. Word has length 38 [2021-12-22 10:56:51,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:51,296 INFO L470 AbstractCegarLoop]: Abstraction has 732 states and 1081 transitions. [2021-12-22 10:56:51,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:51,296 INFO L276 IsEmpty]: Start isEmpty. Operand 732 states and 1081 transitions. [2021-12-22 10:56:51,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 10:56:51,297 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:51,297 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:51,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:51,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-22 10:56:51,507 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:51,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:51,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1715872859, now seen corresponding path program 1 times [2021-12-22 10:56:51,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:51,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81060035] [2021-12-22 10:56:51,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:51,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:51,514 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:51,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1047977805] [2021-12-22 10:56:51,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:51,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:51,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:51,518 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:51,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-22 10:56:51,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:51,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 10:56:51,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:51,642 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:51,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:51,763 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 10:56:51,763 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:51,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81060035] [2021-12-22 10:56:51,764 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:51,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047977805] [2021-12-22 10:56:51,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047977805] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:51,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:51,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-12-22 10:56:51,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889528200] [2021-12-22 10:56:51,765 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:51,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-22 10:56:51,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:51,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-22 10:56:51,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-12-22 10:56:51,769 INFO L87 Difference]: Start difference. First operand 732 states and 1081 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:52,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:52,126 INFO L93 Difference]: Finished difference Result 1593 states and 2375 transitions. [2021-12-22 10:56:52,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-22 10:56:52,126 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2021-12-22 10:56:52,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:52,131 INFO L225 Difference]: With dead ends: 1593 [2021-12-22 10:56:52,131 INFO L226 Difference]: Without dead ends: 1115 [2021-12-22 10:56:52,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2021-12-22 10:56:52,133 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 286 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:52,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [286 Valid, 390 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 10:56:52,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1115 states. [2021-12-22 10:56:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1115 to 1068. [2021-12-22 10:56:52,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1068 states, 696 states have (on average 1.3117816091954022) internal successors, (913), 729 states have internal predecessors, (913), 316 states have call successors, (316), 55 states have call predecessors, (316), 55 states have return successors, (310), 283 states have call predecessors, (310), 310 states have call successors, (310) [2021-12-22 10:56:52,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1068 states to 1068 states and 1539 transitions. [2021-12-22 10:56:52,248 INFO L78 Accepts]: Start accepts. Automaton has 1068 states and 1539 transitions. Word has length 39 [2021-12-22 10:56:52,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:52,248 INFO L470 AbstractCegarLoop]: Abstraction has 1068 states and 1539 transitions. [2021-12-22 10:56:52,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-22 10:56:52,249 INFO L276 IsEmpty]: Start isEmpty. Operand 1068 states and 1539 transitions. [2021-12-22 10:56:52,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-22 10:56:52,249 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:52,249 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:52,274 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-22 10:56:52,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:52,463 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:52,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:52,464 INFO L85 PathProgramCache]: Analyzing trace with hash -827121215, now seen corresponding path program 2 times [2021-12-22 10:56:52,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:52,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403559967] [2021-12-22 10:56:52,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:52,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:52,474 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:52,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2058742434] [2021-12-22 10:56:52,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:56:52,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:52,475 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:52,485 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:52,486 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-22 10:56:52,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:56:52,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:56:52,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 10:56:52,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:52,592 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-22 10:56:52,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:56:52,593 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:52,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403559967] [2021-12-22 10:56:52,593 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:52,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058742434] [2021-12-22 10:56:52,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058742434] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:56:52,593 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:56:52,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:56:52,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483792478] [2021-12-22 10:56:52,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:56:52,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:56:52,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:52,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:56:52,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:56:52,594 INFO L87 Difference]: Start difference. First operand 1068 states and 1539 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:52,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:56:52,771 INFO L93 Difference]: Finished difference Result 1696 states and 2535 transitions. [2021-12-22 10:56:52,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 10:56:52,772 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 40 [2021-12-22 10:56:52,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:56:52,779 INFO L225 Difference]: With dead ends: 1696 [2021-12-22 10:56:52,779 INFO L226 Difference]: Without dead ends: 1230 [2021-12-22 10:56:52,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-22 10:56:52,781 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 29 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:56:52,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 179 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:56:52,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1230 states. [2021-12-22 10:56:52,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1230 to 991. [2021-12-22 10:56:52,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 991 states, 659 states have (on average 1.3019726858877088) internal successors, (858), 689 states have internal predecessors, (858), 276 states have call successors, (276), 55 states have call predecessors, (276), 55 states have return successors, (270), 246 states have call predecessors, (270), 270 states have call successors, (270) [2021-12-22 10:56:52,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 991 states to 991 states and 1404 transitions. [2021-12-22 10:56:52,909 INFO L78 Accepts]: Start accepts. Automaton has 991 states and 1404 transitions. Word has length 40 [2021-12-22 10:56:52,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:56:52,910 INFO L470 AbstractCegarLoop]: Abstraction has 991 states and 1404 transitions. [2021-12-22 10:56:52,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 10:56:52,910 INFO L276 IsEmpty]: Start isEmpty. Operand 991 states and 1404 transitions. [2021-12-22 10:56:52,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-22 10:56:52,910 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:56:52,911 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:56:52,932 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-22 10:56:53,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-22 10:56:53,126 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:56:53,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:56:53,127 INFO L85 PathProgramCache]: Analyzing trace with hash 753696694, now seen corresponding path program 1 times [2021-12-22 10:56:53,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:56:53,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301085062] [2021-12-22 10:56:53,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:53,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:56:53,147 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:56:53,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2122596635] [2021-12-22 10:56:53,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:56:53,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:56:53,149 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:56:53,150 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:56:53,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-22 10:56:53,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:56:53,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-22 10:56:53,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:56:53,748 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-22 10:56:53,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:56:54,345 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-22 10:56:54,345 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:56:54,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301085062] [2021-12-22 10:56:54,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:56:54,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122596635] [2021-12-22 10:56:54,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122596635] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:56:54,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:56:54,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2021-12-22 10:56:54,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428214380] [2021-12-22 10:56:54,346 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:56:54,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-22 10:56:54,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:56:54,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-22 10:56:54,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-12-22 10:56:54,347 INFO L87 Difference]: Start difference. First operand 991 states and 1404 transitions. Second operand has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-12-22 10:56:59,472 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-22 10:57:02,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:02,819 INFO L93 Difference]: Finished difference Result 1352 states and 1914 transitions. [2021-12-22 10:57:02,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-22 10:57:02,819 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 54 [2021-12-22 10:57:02,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:02,825 INFO L225 Difference]: With dead ends: 1352 [2021-12-22 10:57:02,825 INFO L226 Difference]: Without dead ends: 1344 [2021-12-22 10:57:02,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=332, Invalid=1560, Unknown=0, NotChecked=0, Total=1892 [2021-12-22 10:57:02,826 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 221 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1142 mSolverCounterSat, 305 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 1448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 1142 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:02,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 705 Invalid, 1448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 1142 Invalid, 1 Unknown, 0 Unchecked, 7.2s Time] [2021-12-22 10:57:02,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1344 states. [2021-12-22 10:57:03,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1344 to 1194. [2021-12-22 10:57:03,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1194 states, 812 states have (on average 1.293103448275862) internal successors, (1050), 837 states have internal predecessors, (1050), 310 states have call successors, (310), 71 states have call predecessors, (310), 71 states have return successors, (306), 285 states have call predecessors, (306), 306 states have call successors, (306) [2021-12-22 10:57:03,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1666 transitions. [2021-12-22 10:57:03,027 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1666 transitions. Word has length 54 [2021-12-22 10:57:03,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:03,027 INFO L470 AbstractCegarLoop]: Abstraction has 1194 states and 1666 transitions. [2021-12-22 10:57:03,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-12-22 10:57:03,028 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1666 transitions. [2021-12-22 10:57:03,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-22 10:57:03,028 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:03,028 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:03,046 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-22 10:57:03,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-22 10:57:03,235 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:03,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:03,236 INFO L85 PathProgramCache]: Analyzing trace with hash -2108492507, now seen corresponding path program 1 times [2021-12-22 10:57:03,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:03,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128352911] [2021-12-22 10:57:03,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:03,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:03,254 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:03,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2057810510] [2021-12-22 10:57:03,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:03,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:03,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:03,263 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:03,265 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-22 10:57:03,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:57:03,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 10:57:03,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:03,427 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-22 10:57:03,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:57:03,581 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-22 10:57:03,581 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:03,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128352911] [2021-12-22 10:57:03,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:03,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057810510] [2021-12-22 10:57:03,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057810510] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:57:03,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:57:03,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2021-12-22 10:57:03,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854723036] [2021-12-22 10:57:03,582 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:57:03,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-22 10:57:03,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:03,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-22 10:57:03,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2021-12-22 10:57:03,583 INFO L87 Difference]: Start difference. First operand 1194 states and 1666 transitions. Second operand has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-12-22 10:57:04,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:04,292 INFO L93 Difference]: Finished difference Result 2551 states and 3669 transitions. [2021-12-22 10:57:04,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-22 10:57:04,292 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2021-12-22 10:57:04,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:04,303 INFO L225 Difference]: With dead ends: 2551 [2021-12-22 10:57:04,303 INFO L226 Difference]: Without dead ends: 2529 [2021-12-22 10:57:04,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=287, Invalid=525, Unknown=0, NotChecked=0, Total=812 [2021-12-22 10:57:04,305 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 376 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 376 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:04,305 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [376 Valid, 501 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 10:57:04,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2529 states. [2021-12-22 10:57:04,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2529 to 2397. [2021-12-22 10:57:04,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2397 states, 1640 states have (on average 1.3073170731707318) internal successors, (2144), 1710 states have internal predecessors, (2144), 641 states have call successors, (641), 115 states have call predecessors, (641), 115 states have return successors, (634), 571 states have call predecessors, (634), 634 states have call successors, (634) [2021-12-22 10:57:04,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2397 states to 2397 states and 3419 transitions. [2021-12-22 10:57:04,654 INFO L78 Accepts]: Start accepts. Automaton has 2397 states and 3419 transitions. Word has length 60 [2021-12-22 10:57:04,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:04,654 INFO L470 AbstractCegarLoop]: Abstraction has 2397 states and 3419 transitions. [2021-12-22 10:57:04,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-12-22 10:57:04,655 INFO L276 IsEmpty]: Start isEmpty. Operand 2397 states and 3419 transitions. [2021-12-22 10:57:04,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-22 10:57:04,655 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:04,656 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:04,681 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-22 10:57:04,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-22 10:57:04,872 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:04,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:04,872 INFO L85 PathProgramCache]: Analyzing trace with hash -862496580, now seen corresponding path program 1 times [2021-12-22 10:57:04,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:04,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008700738] [2021-12-22 10:57:04,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:04,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:04,879 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:04,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [629392487] [2021-12-22 10:57:04,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:04,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:04,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:04,885 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:04,888 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-22 10:57:04,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:57:04,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 10:57:04,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:05,126 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-12-22 10:57:05,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:57:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-12-22 10:57:05,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:05,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008700738] [2021-12-22 10:57:05,271 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:05,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629392487] [2021-12-22 10:57:05,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629392487] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-22 10:57:05,272 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 10:57:05,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2021-12-22 10:57:05,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465336005] [2021-12-22 10:57:05,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:57:05,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:57:05,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:05,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:57:05,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-12-22 10:57:05,273 INFO L87 Difference]: Start difference. First operand 2397 states and 3419 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 10:57:05,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:05,599 INFO L93 Difference]: Finished difference Result 2458 states and 3479 transitions. [2021-12-22 10:57:05,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 10:57:05,600 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 63 [2021-12-22 10:57:05,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:05,610 INFO L225 Difference]: With dead ends: 2458 [2021-12-22 10:57:05,610 INFO L226 Difference]: Without dead ends: 2456 [2021-12-22 10:57:05,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-12-22 10:57:05,611 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 12 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:05,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 137 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:57:05,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2456 states. [2021-12-22 10:57:05,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2456 to 2433. [2021-12-22 10:57:05,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2433 states, 1667 states have (on average 1.3011397720455908) internal successors, (2169), 1737 states have internal predecessors, (2169), 641 states have call successors, (641), 124 states have call predecessors, (641), 124 states have return successors, (634), 571 states have call predecessors, (634), 634 states have call successors, (634) [2021-12-22 10:57:05,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2433 states to 2433 states and 3444 transitions. [2021-12-22 10:57:05,977 INFO L78 Accepts]: Start accepts. Automaton has 2433 states and 3444 transitions. Word has length 63 [2021-12-22 10:57:05,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:05,977 INFO L470 AbstractCegarLoop]: Abstraction has 2433 states and 3444 transitions. [2021-12-22 10:57:05,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 10:57:05,978 INFO L276 IsEmpty]: Start isEmpty. Operand 2433 states and 3444 transitions. [2021-12-22 10:57:05,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-22 10:57:05,979 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:05,979 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:06,002 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-22 10:57:06,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:06,194 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:06,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:06,195 INFO L85 PathProgramCache]: Analyzing trace with hash 834529569, now seen corresponding path program 1 times [2021-12-22 10:57:06,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:06,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637916296] [2021-12-22 10:57:06,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:06,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:06,202 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:06,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [627144366] [2021-12-22 10:57:06,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:06,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:06,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:06,209 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:06,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-22 10:57:06,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:57:06,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 10:57:06,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:06,380 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-12-22 10:57:06,380 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 10:57:06,380 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:06,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637916296] [2021-12-22 10:57:06,381 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:06,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627144366] [2021-12-22 10:57:06,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627144366] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:57:06,381 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:57:06,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:57:06,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49028614] [2021-12-22 10:57:06,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:57:06,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:57:06,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:06,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:57:06,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:57:06,383 INFO L87 Difference]: Start difference. First operand 2433 states and 3444 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-22 10:57:06,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:06,691 INFO L93 Difference]: Finished difference Result 4403 states and 6223 transitions. [2021-12-22 10:57:06,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 10:57:06,691 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 69 [2021-12-22 10:57:06,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:06,699 INFO L225 Difference]: With dead ends: 4403 [2021-12-22 10:57:06,700 INFO L226 Difference]: Without dead ends: 2613 [2021-12-22 10:57:06,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-22 10:57:06,704 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 12 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:06,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 143 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:57:06,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2613 states. [2021-12-22 10:57:07,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2613 to 2417. [2021-12-22 10:57:07,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2417 states, 1725 states have (on average 1.3014492753623188) internal successors, (2245), 1757 states have internal predecessors, (2245), 569 states have call successors, (569), 122 states have call predecessors, (569), 122 states have return successors, (562), 537 states have call predecessors, (562), 562 states have call successors, (562) [2021-12-22 10:57:07,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2417 states to 2417 states and 3376 transitions. [2021-12-22 10:57:07,112 INFO L78 Accepts]: Start accepts. Automaton has 2417 states and 3376 transitions. Word has length 69 [2021-12-22 10:57:07,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:07,113 INFO L470 AbstractCegarLoop]: Abstraction has 2417 states and 3376 transitions. [2021-12-22 10:57:07,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-22 10:57:07,113 INFO L276 IsEmpty]: Start isEmpty. Operand 2417 states and 3376 transitions. [2021-12-22 10:57:07,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-22 10:57:07,114 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:07,114 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:07,133 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-22 10:57:07,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:07,323 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:07,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:07,323 INFO L85 PathProgramCache]: Analyzing trace with hash 211513650, now seen corresponding path program 2 times [2021-12-22 10:57:07,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:07,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78608283] [2021-12-22 10:57:07,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:07,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:07,329 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:07,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [65301358] [2021-12-22 10:57:07,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:57:07,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:07,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:07,331 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:07,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-22 10:57:07,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:57:07,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:57:07,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 74 conjunts are in the unsatisfiable core [2021-12-22 10:57:07,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:08,272 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 47 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-22 10:57:08,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:57:08,835 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 21 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-22 10:57:08,836 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:08,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78608283] [2021-12-22 10:57:08,836 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:08,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65301358] [2021-12-22 10:57:08,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65301358] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:57:08,836 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:57:08,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12] total 23 [2021-12-22 10:57:08,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242977888] [2021-12-22 10:57:08,837 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:57:08,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-22 10:57:08,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:08,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-22 10:57:08,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-12-22 10:57:08,838 INFO L87 Difference]: Start difference. First operand 2417 states and 3376 transitions. Second operand has 23 states, 20 states have (on average 3.7) internal successors, (74), 19 states have internal predecessors, (74), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-22 10:57:13,420 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-22 10:57:15,317 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.90s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-22 10:57:20,215 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.60s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-22 10:57:20,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:20,943 INFO L93 Difference]: Finished difference Result 2913 states and 4004 transitions. [2021-12-22 10:57:20,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-22 10:57:20,944 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 3.7) internal successors, (74), 19 states have internal predecessors, (74), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) Word has length 71 [2021-12-22 10:57:20,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:20,952 INFO L225 Difference]: With dead ends: 2913 [2021-12-22 10:57:20,952 INFO L226 Difference]: Without dead ends: 2911 [2021-12-22 10:57:20,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=304, Invalid=1336, Unknown=0, NotChecked=0, Total=1640 [2021-12-22 10:57:20,954 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 206 mSDsluCounter, 733 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 249 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 804 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:20,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 804 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 753 Invalid, 1 Unknown, 0 Unchecked, 11.0s Time] [2021-12-22 10:57:20,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2911 states. [2021-12-22 10:57:21,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2911 to 2835. [2021-12-22 10:57:21,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2835 states, 2063 states have (on average 1.3029568589432865) internal successors, (2688), 2106 states have internal predecessors, (2688), 615 states have call successors, (615), 156 states have call predecessors, (615), 156 states have return successors, (608), 572 states have call predecessors, (608), 608 states have call successors, (608) [2021-12-22 10:57:21,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2835 states to 2835 states and 3911 transitions. [2021-12-22 10:57:21,449 INFO L78 Accepts]: Start accepts. Automaton has 2835 states and 3911 transitions. Word has length 71 [2021-12-22 10:57:21,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:21,449 INFO L470 AbstractCegarLoop]: Abstraction has 2835 states and 3911 transitions. [2021-12-22 10:57:21,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 3.7) internal successors, (74), 19 states have internal predecessors, (74), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-22 10:57:21,449 INFO L276 IsEmpty]: Start isEmpty. Operand 2835 states and 3911 transitions. [2021-12-22 10:57:21,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-22 10:57:21,450 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:21,450 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:21,467 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-22 10:57:21,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-22 10:57:21,654 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:21,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:21,654 INFO L85 PathProgramCache]: Analyzing trace with hash 940337767, now seen corresponding path program 1 times [2021-12-22 10:57:21,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:21,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12754535] [2021-12-22 10:57:21,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:21,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:21,661 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:21,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [386256147] [2021-12-22 10:57:21,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:21,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:21,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:21,663 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:21,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-22 10:57:21,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:57:21,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-22 10:57:21,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:22,146 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 22 proven. 45 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-12-22 10:57:22,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:57:22,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:22,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12754535] [2021-12-22 10:57:22,707 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:22,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386256147] [2021-12-22 10:57:22,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386256147] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:57:22,707 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 10:57:22,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-12-22 10:57:22,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145314724] [2021-12-22 10:57:22,708 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 10:57:22,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-22 10:57:22,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:22,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-22 10:57:22,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-12-22 10:57:22,709 INFO L87 Difference]: Start difference. First operand 2835 states and 3911 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-12-22 10:57:23,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:57:23,429 INFO L93 Difference]: Finished difference Result 2926 states and 4039 transitions. [2021-12-22 10:57:23,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 10:57:23,431 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 85 [2021-12-22 10:57:23,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:57:23,440 INFO L225 Difference]: With dead ends: 2926 [2021-12-22 10:57:23,440 INFO L226 Difference]: Without dead ends: 2924 [2021-12-22 10:57:23,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-12-22 10:57:23,442 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 63 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 430 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 10:57:23,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 422 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 430 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 10:57:23,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2924 states. [2021-12-22 10:57:23,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2924 to 2915. [2021-12-22 10:57:23,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2915 states, 2107 states have (on average 1.3009017560512577) internal successors, (2741), 2151 states have internal predecessors, (2741), 643 states have call successors, (643), 164 states have call predecessors, (643), 164 states have return successors, (636), 599 states have call predecessors, (636), 636 states have call successors, (636) [2021-12-22 10:57:23,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2915 states to 2915 states and 4020 transitions. [2021-12-22 10:57:23,885 INFO L78 Accepts]: Start accepts. Automaton has 2915 states and 4020 transitions. Word has length 85 [2021-12-22 10:57:23,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:57:23,886 INFO L470 AbstractCegarLoop]: Abstraction has 2915 states and 4020 transitions. [2021-12-22 10:57:23,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-12-22 10:57:23,886 INFO L276 IsEmpty]: Start isEmpty. Operand 2915 states and 4020 transitions. [2021-12-22 10:57:23,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-12-22 10:57:23,887 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:57:23,887 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:57:23,907 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-22 10:57:24,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-22 10:57:24,099 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:57:24,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:57:24,099 INFO L85 PathProgramCache]: Analyzing trace with hash -1813624164, now seen corresponding path program 1 times [2021-12-22 10:57:24,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:57:24,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131877953] [2021-12-22 10:57:24,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:24,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:57:24,108 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 10:57:24,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1871377898] [2021-12-22 10:57:24,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:57:24,109 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:57:24,109 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:57:24,110 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:57:24,111 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-22 10:57:24,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:57:24,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 85 conjunts are in the unsatisfiable core [2021-12-22 10:57:24,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:57:25,531 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 51 proven. 39 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-12-22 10:57:25,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:57:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-12-22 10:57:29,623 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:57:29,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131877953] [2021-12-22 10:57:29,623 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 10:57:29,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871377898] [2021-12-22 10:57:29,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871377898] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:57:29,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 10:57:29,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 30 [2021-12-22 10:57:29,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756131880] [2021-12-22 10:57:29,623 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 10:57:29,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-22 10:57:29,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:57:29,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-22 10:57:29,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2021-12-22 10:57:29,624 INFO L87 Difference]: Start difference. First operand 2915 states and 4020 transitions. Second operand has 30 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 11 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 8 states have call predecessors, (18), 9 states have call successors, (18) [2021-12-22 10:57:37,986 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-22 10:57:43,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []