./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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/ps4-ll_valuebound50.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 dcebefc76bde79b9a5fa67feebc75881761b0a4209b78516b385f787f62f9340 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:50:35,014 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:50:35,016 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:50:35,043 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:50:35,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:50:35,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:50:35,046 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:50:35,047 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:50:35,048 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:50:35,049 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:50:35,050 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:50:35,051 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:50:35,051 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:50:35,052 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:50:35,053 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:50:35,053 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:50:35,054 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:50:35,055 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:50:35,056 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:50:35,057 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:50:35,058 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:50:35,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:50:35,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:50:35,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:50:35,063 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:50:35,063 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:50:35,064 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:50:35,064 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:50:35,065 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:50:35,065 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:50:35,066 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:50:35,066 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:50:35,067 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:50:35,067 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:50:35,068 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:50:35,068 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:50:35,069 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:50:35,069 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:50:35,070 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:50:35,070 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:50:35,071 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:50:35,076 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:50:35,105 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:50:35,105 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:50:35,106 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:50:35,106 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:50:35,107 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:50:35,107 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:50:35,107 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:50:35,108 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:50:35,108 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:50:35,108 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:50:35,109 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:50:35,109 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:50:35,109 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:50:35,109 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:50:35,110 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:50:35,110 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:50:35,110 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:50:35,110 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:50:35,110 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:50:35,111 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:50:35,111 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:50:35,111 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:50:35,111 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:50:35,111 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:50:35,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:50:35,112 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:50:35,112 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:50:35,113 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:50:35,114 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:50:35,114 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:50:35,114 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:50:35,114 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:50:35,115 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:50:35,115 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:50:35,115 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dcebefc76bde79b9a5fa67feebc75881761b0a4209b78516b385f787f62f9340 [2021-12-21 12:50:35,316 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:50:35,336 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:50:35,338 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:50:35,339 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:50:35,339 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:50:35,340 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound50.c [2021-12-21 12:50:35,406 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bac2c3728/6bc8b99b03014a05beb64d2815874cac/FLAG368042933 [2021-12-21 12:50:35,748 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:50:35,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound50.c [2021-12-21 12:50:35,753 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bac2c3728/6bc8b99b03014a05beb64d2815874cac/FLAG368042933 [2021-12-21 12:50:36,186 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bac2c3728/6bc8b99b03014a05beb64d2815874cac [2021-12-21 12:50:36,189 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:50:36,190 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:50:36,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:50:36,195 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:50:36,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:50:36,198 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,199 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cabe8fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36, skipping insertion in model container [2021-12-21 12:50:36,199 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,205 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:50:36,215 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:50:36,348 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/ps4-ll_valuebound50.c[458,471] [2021-12-21 12:50:36,358 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:50:36,364 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:50:36,374 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/ps4-ll_valuebound50.c[458,471] [2021-12-21 12:50:36,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:50:36,389 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:50:36,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36 WrapperNode [2021-12-21 12:50:36,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:50:36,392 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:50:36,392 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:50:36,392 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:50:36,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,404 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,419 INFO L137 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 38 [2021-12-21 12:50:36,419 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:50:36,420 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:50:36,420 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:50:36,421 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:50:36,427 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,427 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,433 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,433 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,438 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,438 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,440 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:50:36,440 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:50:36,441 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:50:36,441 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:50:36,441 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (1/1) ... [2021-12-21 12:50:36,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:50:36,458 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:36,467 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) [2021-12-21 12:50:36,472 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 [2021-12-21 12:50:36,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:50:36,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:50:36,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:50:36,498 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:50:36,498 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 12:50:36,498 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 12:50:36,538 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:50:36,539 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:50:36,621 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:50:36,626 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:50:36,627 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 12:50:36,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:50:36 BoogieIcfgContainer [2021-12-21 12:50:36,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:50:36,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:50:36,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:50:36,634 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:50:36,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:50:36" (1/3) ... [2021-12-21 12:50:36,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73858e32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:50:36, skipping insertion in model container [2021-12-21 12:50:36,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:36" (2/3) ... [2021-12-21 12:50:36,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73858e32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:50:36, skipping insertion in model container [2021-12-21 12:50:36,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:50:36" (3/3) ... [2021-12-21 12:50:36,637 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound50.c [2021-12-21 12:50:36,641 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:50:36,642 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:50:36,680 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:50:36,686 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 [2021-12-21 12:50:36,699 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:50:36,727 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:36,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 12:50:36,730 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:36,731 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:36,731 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:36,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:36,735 INFO L85 PathProgramCache]: Analyzing trace with hash -589436290, now seen corresponding path program 1 times [2021-12-21 12:50:36,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:36,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436743412] [2021-12-21 12:50:36,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:36,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:36,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:36,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:36,910 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:36,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436743412] [2021-12-21 12:50:36,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436743412] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:50:36,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:50:36,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 12:50:36,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078932829] [2021-12-21 12:50:36,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:36,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-21 12:50:36,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:36,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-21 12:50:36,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:50:36,953 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:36,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:36,967 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-12-21 12:50:36,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 12:50:36,969 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-21 12:50:36,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:36,974 INFO L225 Difference]: With dead ends: 35 [2021-12-21 12:50:36,974 INFO L226 Difference]: Without dead ends: 15 [2021-12-21 12:50:36,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:50:36,983 INFO L933 BasicCegarLoop]: 21 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, 21 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 [2021-12-21 12:50:36,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:36,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-12-21 12:50:37,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-12-21 12:50:37,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:37,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-12-21 12:50:37,008 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-12-21 12:50:37,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:37,009 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-12-21 12:50:37,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:37,009 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-12-21 12:50:37,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 12:50:37,010 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:37,010 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:37,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:50:37,011 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:37,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:37,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1187358532, now seen corresponding path program 1 times [2021-12-21 12:50:37,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:37,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480978902] [2021-12-21 12:50:37,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:37,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:37,023 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:37,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1278754926] [2021-12-21 12:50:37,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:37,024 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:37,024 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:37,026 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) [2021-12-21 12:50:37,027 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:50:37,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:37,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-21 12:50:37,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:37,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:37,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:50:37,155 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:37,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480978902] [2021-12-21 12:50:37,155 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:37,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278754926] [2021-12-21 12:50:37,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278754926] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:50:37,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:50:37,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:50:37,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884363717] [2021-12-21 12:50:37,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:37,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:50:37,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:37,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:50:37,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:50:37,159 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:37,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:37,199 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-21 12:50:37,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:50:37,200 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-21 12:50:37,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:37,200 INFO L225 Difference]: With dead ends: 26 [2021-12-21 12:50:37,201 INFO L226 Difference]: Without dead ends: 22 [2021-12-21 12:50:37,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:50:37,202 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:37,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 51 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:37,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-21 12:50:37,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-12-21 12:50:37,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:37,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-12-21 12:50:37,210 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 9 [2021-12-21 12:50:37,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:37,210 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-12-21 12:50:37,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:37,211 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-12-21 12:50:37,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 12:50:37,211 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:37,212 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:37,238 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:37,425 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 [2021-12-21 12:50:37,426 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:37,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:37,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1781398469, now seen corresponding path program 1 times [2021-12-21 12:50:37,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:37,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048743842] [2021-12-21 12:50:37,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:37,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:37,438 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:37,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [590769557] [2021-12-21 12:50:37,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:37,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:37,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:37,446 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) [2021-12-21 12:50:37,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:50:37,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:37,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:50:37,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:37,613 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:37,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:37,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:50:37,854 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:37,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048743842] [2021-12-21 12:50:37,855 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:37,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590769557] [2021-12-21 12:50:37,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590769557] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:37,856 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:37,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-12-21 12:50:37,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694259433] [2021-12-21 12:50:37,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:37,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:50:37,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:37,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:50:37,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:50:37,859 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:50:37,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:37,889 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-12-21 12:50:37,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:50:37,890 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-12-21 12:50:37,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:37,891 INFO L225 Difference]: With dead ends: 28 [2021-12-21 12:50:37,891 INFO L226 Difference]: Without dead ends: 23 [2021-12-21 12:50:37,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:50:37,892 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:37,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 44 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:37,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-12-21 12:50:37,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-12-21 12:50:37,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:37,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-12-21 12:50:37,898 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2021-12-21 12:50:37,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:37,898 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-12-21 12:50:37,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:50:37,898 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-12-21 12:50:37,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-21 12:50:37,899 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:37,899 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:37,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:38,122 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 [2021-12-21 12:50:38,122 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:38,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:38,123 INFO L85 PathProgramCache]: Analyzing trace with hash -1711372296, now seen corresponding path program 1 times [2021-12-21 12:50:38,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:38,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584745524] [2021-12-21 12:50:38,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:38,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:38,134 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:38,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [540087097] [2021-12-21 12:50:38,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:38,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:38,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:38,139 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) [2021-12-21 12:50:38,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:50:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:38,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:50:38,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:38,327 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:50:38,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:38,499 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:38,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584745524] [2021-12-21 12:50:38,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:38,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540087097] [2021-12-21 12:50:38,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540087097] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:38,500 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:38,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-12-21 12:50:38,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69663987] [2021-12-21 12:50:38,501 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:38,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 12:50:38,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:38,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 12:50:38,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:50:38,502 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:38,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:38,570 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-12-21 12:50:38,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 12:50:38,571 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-12-21 12:50:38,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:38,573 INFO L225 Difference]: With dead ends: 31 [2021-12-21 12:50:38,573 INFO L226 Difference]: Without dead ends: 26 [2021-12-21 12:50:38,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:50:38,578 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 2 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:38,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 81 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:38,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-21 12:50:38,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-21 12:50:38,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:38,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-12-21 12:50:38,595 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-12-21 12:50:38,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:38,595 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-12-21 12:50:38,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:38,596 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-12-21 12:50:38,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 12:50:38,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:38,600 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:38,630 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:38,823 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 [2021-12-21 12:50:38,823 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:38,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:38,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1075497887, now seen corresponding path program 2 times [2021-12-21 12:50:38,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:38,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995606727] [2021-12-21 12:50:38,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:38,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:38,839 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:38,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [997620334] [2021-12-21 12:50:38,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:38,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:38,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:38,841 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) [2021-12-21 12:50:38,849 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:50:38,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:38,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:38,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:50:38,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:39,054 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 12:50:39,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:39,253 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:39,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995606727] [2021-12-21 12:50:39,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:39,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997620334] [2021-12-21 12:50:39,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997620334] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:39,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:39,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-12-21 12:50:39,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596264065] [2021-12-21 12:50:39,254 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:39,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:50:39,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:39,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:50:39,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:50:39,256 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:39,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:39,319 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-12-21 12:50:39,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 12:50:39,320 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2021-12-21 12:50:39,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:39,321 INFO L225 Difference]: With dead ends: 34 [2021-12-21 12:50:39,321 INFO L226 Difference]: Without dead ends: 29 [2021-12-21 12:50:39,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:50:39,322 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 2 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:39,322 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 109 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:39,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-21 12:50:39,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-12-21 12:50:39,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:39,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-12-21 12:50:39,327 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 29 [2021-12-21 12:50:39,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:39,327 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-12-21 12:50:39,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:39,327 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-12-21 12:50:39,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-21 12:50:39,332 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:39,333 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:39,358 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:39,555 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 [2021-12-21 12:50:39,555 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:39,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:39,556 INFO L85 PathProgramCache]: Analyzing trace with hash 817917912, now seen corresponding path program 3 times [2021-12-21 12:50:39,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:39,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290147026] [2021-12-21 12:50:39,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:39,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:39,565 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:39,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [55828910] [2021-12-21 12:50:39,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:39,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:39,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:39,575 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) [2021-12-21 12:50:39,576 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:50:39,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 12:50:39,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:39,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-21 12:50:39,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:39,906 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 12:50:39,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:44,191 WARN L838 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| (- 2))) 4) 0)) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (let ((.cse0 (+ |c_ULTIMATE.start_main_~y~0#1| 1))) (= (* |ULTIMATE.start_main_~k~0#1| .cse0) (* .cse0 .cse0))) (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|)))) is different from false [2021-12-21 12:50:44,194 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:44,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290147026] [2021-12-21 12:50:44,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:44,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55828910] [2021-12-21 12:50:44,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55828910] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:44,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:44,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-21 12:50:44,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208283033] [2021-12-21 12:50:44,195 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:44,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 12:50:44,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:44,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 12:50:44,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=251, Unknown=1, NotChecked=32, Total=342 [2021-12-21 12:50:44,196 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:44,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:44,428 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-12-21 12:50:44,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 12:50:44,428 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-12-21 12:50:44,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:44,429 INFO L225 Difference]: With dead ends: 41 [2021-12-21 12:50:44,429 INFO L226 Difference]: Without dead ends: 36 [2021-12-21 12:50:44,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=79, Invalid=344, Unknown=1, NotChecked=38, Total=462 [2021-12-21 12:50:44,430 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:44,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 131 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:44,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-21 12:50:44,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-21 12:50:44,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:44,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-12-21 12:50:44,437 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 36 [2021-12-21 12:50:44,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:44,437 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-12-21 12:50:44,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:44,438 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-12-21 12:50:44,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:50:44,438 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:44,439 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:44,464 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:44,659 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 [2021-12-21 12:50:44,660 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:44,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:44,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1384689793, now seen corresponding path program 4 times [2021-12-21 12:50:44,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:44,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608551010] [2021-12-21 12:50:44,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:44,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:44,669 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:44,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [42680834] [2021-12-21 12:50:44,669 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:44,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:44,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:44,671 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) [2021-12-21 12:50:44,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:50:44,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:50:44,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:44,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:50:44,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:44,951 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-21 12:50:44,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:45,098 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:45,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608551010] [2021-12-21 12:50:45,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:45,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42680834] [2021-12-21 12:50:45,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42680834] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:45,099 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:45,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-12-21 12:50:45,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528569104] [2021-12-21 12:50:45,099 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:45,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 12:50:45,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:45,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 12:50:45,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:50:45,100 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:45,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:45,198 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-12-21 12:50:45,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:50:45,199 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 43 [2021-12-21 12:50:45,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:45,200 INFO L225 Difference]: With dead ends: 44 [2021-12-21 12:50:45,200 INFO L226 Difference]: Without dead ends: 39 [2021-12-21 12:50:45,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:50:45,201 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 2 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:45,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 177 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:45,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-12-21 12:50:45,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-12-21 12:50:45,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:50:45,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-12-21 12:50:45,208 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 43 [2021-12-21 12:50:45,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:45,209 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-12-21 12:50:45,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:45,209 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-12-21 12:50:45,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-21 12:50:45,210 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:45,210 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:45,236 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:45,423 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 [2021-12-21 12:50:45,424 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:45,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:45,424 INFO L85 PathProgramCache]: Analyzing trace with hash -23130184, now seen corresponding path program 5 times [2021-12-21 12:50:45,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:45,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079931608] [2021-12-21 12:50:45,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:45,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:45,433 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:45,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [556359845] [2021-12-21 12:50:45,433 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:50:45,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:45,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:45,438 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) [2021-12-21 12:50:45,440 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:50:45,498 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-21 12:50:45,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:45,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-21 12:50:45,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:45,759 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-12-21 12:50:45,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:46,152 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:46,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079931608] [2021-12-21 12:50:46,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:46,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556359845] [2021-12-21 12:50:46,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556359845] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:46,153 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:46,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-12-21 12:50:46,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725081101] [2021-12-21 12:50:46,153 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:46,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 12:50:46,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:46,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 12:50:46,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:50:46,155 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:50:46,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:46,284 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-12-21 12:50:46,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 12:50:46,284 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 50 [2021-12-21 12:50:46,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:46,285 INFO L225 Difference]: With dead ends: 47 [2021-12-21 12:50:46,285 INFO L226 Difference]: Without dead ends: 42 [2021-12-21 12:50:46,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:50:46,286 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 2 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:46,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 217 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:46,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-12-21 12:50:46,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-12-21 12:50:46,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:46,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-12-21 12:50:46,300 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 50 [2021-12-21 12:50:46,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:46,300 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-12-21 12:50:46,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:50:46,300 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-12-21 12:50:46,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-21 12:50:46,301 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:46,302 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:46,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:46,527 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 [2021-12-21 12:50:46,528 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:46,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:46,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1898941279, now seen corresponding path program 6 times [2021-12-21 12:50:46,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:46,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283706070] [2021-12-21 12:50:46,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:46,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:46,536 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:46,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [327027082] [2021-12-21 12:50:46,540 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:50:46,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:46,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:46,541 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) [2021-12-21 12:50:46,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:50:46,600 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:50:46,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:46,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-21 12:50:46,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 12:50:46,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:47,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:47,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283706070] [2021-12-21 12:50:47,021 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:47,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327027082] [2021-12-21 12:50:47,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327027082] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:47,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:47,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-12-21 12:50:47,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743356027] [2021-12-21 12:50:47,022 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:47,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:50:47,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:47,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:50:47,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:50:47,023 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:47,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:47,167 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-12-21 12:50:47,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 12:50:47,167 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 57 [2021-12-21 12:50:47,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:47,168 INFO L225 Difference]: With dead ends: 50 [2021-12-21 12:50:47,168 INFO L226 Difference]: Without dead ends: 45 [2021-12-21 12:50:47,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:50:47,169 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:47,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 261 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:47,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-21 12:50:47,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-12-21 12:50:47,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:47,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-12-21 12:50:47,176 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 57 [2021-12-21 12:50:47,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:47,176 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-12-21 12:50:47,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:47,177 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-12-21 12:50:47,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-21 12:50:47,178 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:47,178 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:47,202 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:47,399 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 [2021-12-21 12:50:47,399 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:47,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:47,400 INFO L85 PathProgramCache]: Analyzing trace with hash 385378200, now seen corresponding path program 7 times [2021-12-21 12:50:47,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:47,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865244185] [2021-12-21 12:50:47,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:47,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:47,409 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:47,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [832940771] [2021-12-21 12:50:47,412 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:50:47,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:47,413 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:47,414 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) [2021-12-21 12:50:47,415 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:50:47,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:47,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 12:50:47,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:47,934 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-21 12:50:47,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:48,067 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:48,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865244185] [2021-12-21 12:50:48,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:48,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832940771] [2021-12-21 12:50:48,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832940771] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:48,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:48,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-21 12:50:48,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875980301] [2021-12-21 12:50:48,068 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:48,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 12:50:48,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:48,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 12:50:48,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:50:48,069 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:48,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:48,235 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2021-12-21 12:50:48,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 12:50:48,235 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 64 [2021-12-21 12:50:48,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:48,236 INFO L225 Difference]: With dead ends: 53 [2021-12-21 12:50:48,236 INFO L226 Difference]: Without dead ends: 48 [2021-12-21 12:50:48,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:50:48,237 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 2 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:48,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 309 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:48,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-21 12:50:48,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-12-21 12:50:48,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:50:48,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-12-21 12:50:48,244 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 64 [2021-12-21 12:50:48,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:48,245 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-12-21 12:50:48,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:48,245 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-12-21 12:50:48,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-21 12:50:48,246 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:48,246 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:48,258 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:48,452 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 [2021-12-21 12:50:48,452 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:48,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:48,453 INFO L85 PathProgramCache]: Analyzing trace with hash 2073985217, now seen corresponding path program 8 times [2021-12-21 12:50:48,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:48,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170801345] [2021-12-21 12:50:48,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:48,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:48,463 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:48,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [904424801] [2021-12-21 12:50:48,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:48,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:48,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:48,468 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) [2021-12-21 12:50:48,487 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:50:48,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:48,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:48,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-21 12:50:48,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:49,027 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-12-21 12:50:49,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:49,166 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:49,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170801345] [2021-12-21 12:50:49,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:49,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904424801] [2021-12-21 12:50:49,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904424801] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:49,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:49,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-12-21 12:50:49,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692375805] [2021-12-21 12:50:49,167 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:49,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:50:49,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:49,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:50:49,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:50:49,168 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:50:49,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:49,361 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-12-21 12:50:49,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 12:50:49,362 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 71 [2021-12-21 12:50:49,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:49,363 INFO L225 Difference]: With dead ends: 56 [2021-12-21 12:50:49,363 INFO L226 Difference]: Without dead ends: 51 [2021-12-21 12:50:49,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:50:49,364 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 2 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:49,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 361 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:49,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-21 12:50:49,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-12-21 12:50:49,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:49,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 58 transitions. [2021-12-21 12:50:49,370 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 58 transitions. Word has length 71 [2021-12-21 12:50:49,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:49,371 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 58 transitions. [2021-12-21 12:50:49,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:50:49,371 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 58 transitions. [2021-12-21 12:50:49,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-12-21 12:50:49,372 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:49,372 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:49,381 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:49,579 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 [2021-12-21 12:50:49,579 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:49,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:49,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1353348984, now seen corresponding path program 9 times [2021-12-21 12:50:49,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:49,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085324407] [2021-12-21 12:50:49,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:49,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:49,592 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:49,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977848406] [2021-12-21 12:50:49,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:49,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:49,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:49,595 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) [2021-12-21 12:50:49,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:50:49,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-21 12:50:49,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:49,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-21 12:50:49,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:50,265 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-12-21 12:50:50,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:50,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:50,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085324407] [2021-12-21 12:50:50,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:50,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977848406] [2021-12-21 12:50:50,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977848406] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:50,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:50,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-12-21 12:50:50,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260622528] [2021-12-21 12:50:50,406 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:50,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 12:50:50,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:50,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 12:50:50,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:50:50,407 INFO L87 Difference]: Start difference. First operand 51 states and 58 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:50,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:50,628 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2021-12-21 12:50:50,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:50:50,629 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 78 [2021-12-21 12:50:50,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:50,630 INFO L225 Difference]: With dead ends: 59 [2021-12-21 12:50:50,630 INFO L226 Difference]: Without dead ends: 54 [2021-12-21 12:50:50,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:50:50,631 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 2 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:50,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 417 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:50,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-21 12:50:50,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-21 12:50:50,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:50,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2021-12-21 12:50:50,638 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 78 [2021-12-21 12:50:50,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:50,639 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2021-12-21 12:50:50,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:50,643 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2021-12-21 12:50:50,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-21 12:50:50,647 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:50,648 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:50,657 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:50,854 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 [2021-12-21 12:50:50,854 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:50,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:50,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1817498849, now seen corresponding path program 10 times [2021-12-21 12:50:50,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:50,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537827643] [2021-12-21 12:50:50,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:50,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:50,864 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:50,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [467026162] [2021-12-21 12:50:50,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:50,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:50,865 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:50,871 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) [2021-12-21 12:50:50,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 12:50:51,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:50:51,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:51,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-21 12:50:51,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:51,476 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-12-21 12:50:51,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:51,623 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:51,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537827643] [2021-12-21 12:50:51,623 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:51,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467026162] [2021-12-21 12:50:51,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467026162] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:51,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:51,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-12-21 12:50:51,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915933800] [2021-12-21 12:50:51,624 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:51,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:50:51,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:51,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:50:51,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:50:51,626 INFO L87 Difference]: Start difference. First operand 54 states and 62 transitions. Second operand has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:51,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:51,867 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-12-21 12:50:51,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 12:50:51,868 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 85 [2021-12-21 12:50:51,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:51,868 INFO L225 Difference]: With dead ends: 62 [2021-12-21 12:50:51,868 INFO L226 Difference]: Without dead ends: 57 [2021-12-21 12:50:51,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-12-21 12:50:51,870 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 2 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:51,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 477 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:51,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-21 12:50:51,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-12-21 12:50:51,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:50:51,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-12-21 12:50:51,877 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 85 [2021-12-21 12:50:51,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:51,878 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-12-21 12:50:51,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:51,878 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-12-21 12:50:51,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-12-21 12:50:51,879 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:51,879 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:51,887 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:52,085 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 [2021-12-21 12:50:52,085 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:52,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:52,086 INFO L85 PathProgramCache]: Analyzing trace with hash 638795608, now seen corresponding path program 11 times [2021-12-21 12:50:52,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:52,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786965502] [2021-12-21 12:50:52,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:52,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:52,097 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:52,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [36655295] [2021-12-21 12:50:52,098 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:50:52,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:52,098 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:52,100 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) [2021-12-21 12:50:52,102 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 12:50:53,294 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-12-21 12:50:53,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:53,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-21 12:50:53,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:53,619 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-12-21 12:50:53,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:53,767 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:53,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786965502] [2021-12-21 12:50:53,767 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:53,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36655295] [2021-12-21 12:50:53,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36655295] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:53,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:53,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-12-21 12:50:53,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869479417] [2021-12-21 12:50:53,768 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:53,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:50:53,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:53,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:50:53,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:50:53,769 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:50:54,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:54,028 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-12-21 12:50:54,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 12:50:54,029 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 92 [2021-12-21 12:50:54,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:54,029 INFO L225 Difference]: With dead ends: 65 [2021-12-21 12:50:54,029 INFO L226 Difference]: Without dead ends: 60 [2021-12-21 12:50:54,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:50:54,030 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 2 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:54,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 541 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:54,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-21 12:50:54,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-12-21 12:50:54,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:50:54,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-12-21 12:50:54,038 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 92 [2021-12-21 12:50:54,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:54,039 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-12-21 12:50:54,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:50:54,039 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-12-21 12:50:54,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-12-21 12:50:54,039 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:54,040 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:54,049 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:54,240 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 [2021-12-21 12:50:54,240 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:54,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:54,241 INFO L85 PathProgramCache]: Analyzing trace with hash 550859009, now seen corresponding path program 12 times [2021-12-21 12:50:54,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:54,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246872282] [2021-12-21 12:50:54,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:54,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:54,248 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:54,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1862106857] [2021-12-21 12:50:54,248 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:50:54,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:54,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:54,249 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) [2021-12-21 12:50:54,259 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 12:50:54,568 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-12-21 12:50:54,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:54,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-21 12:50:54,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:54,976 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 26 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-12-21 12:50:54,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:55,585 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246872282] [2021-12-21 12:50:55,585 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862106857] [2021-12-21 12:50:55,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862106857] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:55,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:55,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-12-21 12:50:55,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150239655] [2021-12-21 12:50:55,585 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:55,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 12:50:55,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:55,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 12:50:55,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:50:55,587 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:50:55,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:55,867 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-12-21 12:50:55,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-21 12:50:55,868 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 99 [2021-12-21 12:50:55,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:55,868 INFO L225 Difference]: With dead ends: 68 [2021-12-21 12:50:55,868 INFO L226 Difference]: Without dead ends: 63 [2021-12-21 12:50:55,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:50:55,870 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 2 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 609 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:55,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 609 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:55,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-12-21 12:50:55,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-12-21 12:50:55,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 15 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:50:55,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-12-21 12:50:55,879 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 99 [2021-12-21 12:50:55,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:55,879 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-12-21 12:50:55,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:50:55,880 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-12-21 12:50:55,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-12-21 12:50:55,880 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:55,881 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:55,887 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:56,086 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 [2021-12-21 12:50:56,087 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:56,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:56,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1794064584, now seen corresponding path program 13 times [2021-12-21 12:50:56,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:56,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426634218] [2021-12-21 12:50:56,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:56,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:56,095 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:56,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1964802120] [2021-12-21 12:50:56,095 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:50:56,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:56,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:56,096 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) [2021-12-21 12:50:56,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 12:50:57,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:57,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-21 12:50:57,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:57,647 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-12-21 12:50:57,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:57,778 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:57,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426634218] [2021-12-21 12:50:57,778 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:57,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964802120] [2021-12-21 12:50:57,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964802120] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:57,778 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:57,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-12-21 12:50:57,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598335113] [2021-12-21 12:50:57,779 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:57,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 12:50:57,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:57,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 12:50:57,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:50:57,780 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:50:58,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:58,046 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-12-21 12:50:58,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:50:58,046 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 106 [2021-12-21 12:50:58,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:58,047 INFO L225 Difference]: With dead ends: 71 [2021-12-21 12:50:58,047 INFO L226 Difference]: Without dead ends: 66 [2021-12-21 12:50:58,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:50:58,048 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 2 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:58,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 681 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:58,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-21 12:50:58,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-12-21 12:50:58,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:50:58,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 78 transitions. [2021-12-21 12:50:58,057 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 78 transitions. Word has length 106 [2021-12-21 12:50:58,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:58,057 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 78 transitions. [2021-12-21 12:50:58,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:50:58,058 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 78 transitions. [2021-12-21 12:50:58,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-21 12:50:58,059 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:58,059 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:58,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:58,265 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 [2021-12-21 12:50:58,266 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:58,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:58,266 INFO L85 PathProgramCache]: Analyzing trace with hash -444443359, now seen corresponding path program 14 times [2021-12-21 12:50:58,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:58,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909220594] [2021-12-21 12:50:58,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:58,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:58,282 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:58,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [485217579] [2021-12-21 12:50:58,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:58,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:58,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:58,284 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) [2021-12-21 12:50:58,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 12:50:59,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:59,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:59,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-21 12:50:59,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:59,772 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 30 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-12-21 12:50:59,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:59,938 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:59,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909220594] [2021-12-21 12:50:59,938 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:59,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485217579] [2021-12-21 12:50:59,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485217579] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:59,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:59,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-12-21 12:50:59,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948519558] [2021-12-21 12:50:59,939 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:59,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 12:50:59,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:59,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 12:50:59,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:50:59,940 INFO L87 Difference]: Start difference. First operand 66 states and 78 transitions. Second operand has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:51:00,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:00,295 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-12-21 12:51:00,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 12:51:00,296 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 113 [2021-12-21 12:51:00,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:00,297 INFO L225 Difference]: With dead ends: 74 [2021-12-21 12:51:00,297 INFO L226 Difference]: Without dead ends: 69 [2021-12-21 12:51:00,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:51:00,298 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 757 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:00,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 757 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:51:00,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-21 12:51:00,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-12-21 12:51:00,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:51:00,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-12-21 12:51:00,307 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 113 [2021-12-21 12:51:00,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:00,307 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-12-21 12:51:00,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:51:00,307 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-12-21 12:51:00,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-12-21 12:51:00,308 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:00,309 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:00,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:00,514 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 [2021-12-21 12:51:00,514 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:00,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:00,515 INFO L85 PathProgramCache]: Analyzing trace with hash -16713960, now seen corresponding path program 15 times [2021-12-21 12:51:00,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:00,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513896383] [2021-12-21 12:51:00,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:00,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:00,521 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:00,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1684030783] [2021-12-21 12:51:00,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:51:00,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:00,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:00,523 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) [2021-12-21 12:51:00,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 12:51:00,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-12-21 12:51:00,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:00,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-21 12:51:00,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:01,331 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-12-21 12:51:01,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:01,536 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:01,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513896383] [2021-12-21 12:51:01,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:01,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684030783] [2021-12-21 12:51:01,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684030783] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:01,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:01,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-12-21 12:51:01,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598059267] [2021-12-21 12:51:01,537 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:01,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 12:51:01,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:01,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 12:51:01,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:51:01,538 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:51:01,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:01,890 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-12-21 12:51:01,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 12:51:01,890 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 120 [2021-12-21 12:51:01,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:01,891 INFO L225 Difference]: With dead ends: 77 [2021-12-21 12:51:01,891 INFO L226 Difference]: Without dead ends: 72 [2021-12-21 12:51:01,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:51:01,892 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 2 mSDsluCounter, 778 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 837 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:01,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 837 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:51:01,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-12-21 12:51:01,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-12-21 12:51:01,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 12:51:01,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 86 transitions. [2021-12-21 12:51:01,901 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 86 transitions. Word has length 120 [2021-12-21 12:51:01,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:01,902 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 86 transitions. [2021-12-21 12:51:01,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:51:01,902 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 86 transitions. [2021-12-21 12:51:01,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-12-21 12:51:01,903 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:01,903 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:01,911 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:02,109 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 [2021-12-21 12:51:02,110 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:02,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:02,110 INFO L85 PathProgramCache]: Analyzing trace with hash -1287814847, now seen corresponding path program 16 times [2021-12-21 12:51:02,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:02,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87013617] [2021-12-21 12:51:02,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:02,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:02,119 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:02,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1998853289] [2021-12-21 12:51:02,119 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:51:02,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:02,119 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:02,120 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) [2021-12-21 12:51:02,122 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 12:51:03,105 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:03,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:03,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-21 12:51:03,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:03,643 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 34 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-12-21 12:51:03,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:03,814 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:03,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87013617] [2021-12-21 12:51:03,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:03,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998853289] [2021-12-21 12:51:03,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998853289] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:03,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:03,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-12-21 12:51:03,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220114807] [2021-12-21 12:51:03,814 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:03,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 12:51:03,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:03,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 12:51:03,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:51:03,816 INFO L87 Difference]: Start difference. First operand 72 states and 86 transitions. Second operand has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 12:51:04,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:04,191 INFO L93 Difference]: Finished difference Result 80 states and 95 transitions. [2021-12-21 12:51:04,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 12:51:04,191 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 127 [2021-12-21 12:51:04,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:04,192 INFO L225 Difference]: With dead ends: 80 [2021-12-21 12:51:04,192 INFO L226 Difference]: Without dead ends: 75 [2021-12-21 12:51:04,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:51:04,193 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 2 mSDsluCounter, 859 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 921 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:04,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 921 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:51:04,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-21 12:51:04,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-12-21 12:51:04,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 19 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-21 12:51:04,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-12-21 12:51:04,202 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 127 [2021-12-21 12:51:04,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:04,203 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-12-21 12:51:04,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 12:51:04,203 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-12-21 12:51:04,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-12-21 12:51:04,204 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:04,204 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:04,211 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:04,411 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 [2021-12-21 12:51:04,412 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:04,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:04,412 INFO L85 PathProgramCache]: Analyzing trace with hash 146925304, now seen corresponding path program 17 times [2021-12-21 12:51:04,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:04,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951240196] [2021-12-21 12:51:04,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:04,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:04,418 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:04,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2065723867] [2021-12-21 12:51:04,418 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:51:04,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:04,419 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:04,419 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) [2021-12-21 12:51:04,420 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 12:51:05,732 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-12-21 12:51:05,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:05,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-21 12:51:05,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:06,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-12-21 12:51:06,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:06,375 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:06,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951240196] [2021-12-21 12:51:06,375 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:06,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065723867] [2021-12-21 12:51:06,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065723867] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:06,376 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:06,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-12-21 12:51:06,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138679450] [2021-12-21 12:51:06,376 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:06,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 12:51:06,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:06,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 12:51:06,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:51:06,377 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-21 12:51:06,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:06,885 INFO L93 Difference]: Finished difference Result 83 states and 99 transitions. [2021-12-21 12:51:06,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:51:06,885 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 134 [2021-12-21 12:51:06,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:06,886 INFO L225 Difference]: With dead ends: 83 [2021-12-21 12:51:06,886 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 12:51:06,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=674, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:51:06,887 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 2 mSDsluCounter, 944 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1009 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:06,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1009 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:51:06,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 12:51:06,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-12-21 12:51:06,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 20 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-21 12:51:06,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2021-12-21 12:51:06,896 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 134 [2021-12-21 12:51:06,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:06,896 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2021-12-21 12:51:06,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-21 12:51:06,896 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2021-12-21 12:51:06,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-12-21 12:51:06,898 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:06,898 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:06,904 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:07,104 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 [2021-12-21 12:51:07,105 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:07,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:07,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1332278625, now seen corresponding path program 18 times [2021-12-21 12:51:07,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:07,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95912528] [2021-12-21 12:51:07,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:07,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:07,112 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:07,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [958546965] [2021-12-21 12:51:07,112 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:51:07,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:07,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:07,113 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) [2021-12-21 12:51:07,117 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 12:51:07,826 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-12-21 12:51:07,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:07,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-21 12:51:07,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:08,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 38 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-12-21 12:51:08,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:08,525 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:08,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95912528] [2021-12-21 12:51:08,525 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:08,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958546965] [2021-12-21 12:51:08,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958546965] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:08,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:08,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-12-21 12:51:08,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765211370] [2021-12-21 12:51:08,525 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:08,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 12:51:08,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:08,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 12:51:08,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:51:08,526 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-21 12:51:08,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:08,962 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2021-12-21 12:51:08,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-21 12:51:08,962 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 141 [2021-12-21 12:51:08,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:08,963 INFO L225 Difference]: With dead ends: 86 [2021-12-21 12:51:08,963 INFO L226 Difference]: Without dead ends: 81 [2021-12-21 12:51:08,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:51:08,964 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 2 mSDsluCounter, 1033 mSDsCounter, 0 mSdLazyCounter, 887 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1101 SdHoareTripleChecker+Invalid, 887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:08,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1101 Invalid, 887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 887 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:51:08,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-21 12:51:08,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-12-21 12:51:08,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 21 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:51:08,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 98 transitions. [2021-12-21 12:51:08,970 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 98 transitions. Word has length 141 [2021-12-21 12:51:08,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:08,971 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 98 transitions. [2021-12-21 12:51:08,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-21 12:51:08,971 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 98 transitions. [2021-12-21 12:51:08,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-12-21 12:51:08,972 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:08,972 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:08,979 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:09,175 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 [2021-12-21 12:51:09,175 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:09,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:09,176 INFO L85 PathProgramCache]: Analyzing trace with hash 2058456792, now seen corresponding path program 19 times [2021-12-21 12:51:09,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:09,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989263503] [2021-12-21 12:51:09,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:09,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:09,184 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:09,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1996797042] [2021-12-21 12:51:09,184 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:51:09,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:09,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:09,185 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) [2021-12-21 12:51:09,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-21 12:51:10,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:10,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 84 conjunts are in the unsatisfiable core [2021-12-21 12:51:10,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:10,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 40 proven. 570 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-12-21 12:51:10,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:10,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:10,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989263503] [2021-12-21 12:51:10,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:10,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996797042] [2021-12-21 12:51:10,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996797042] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:10,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:10,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-12-21 12:51:10,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218883168] [2021-12-21 12:51:10,949 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:10,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-21 12:51:10,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:10,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-21 12:51:10,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:51:10,950 INFO L87 Difference]: Start difference. First operand 81 states and 98 transitions. Second operand has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:51:11,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:11,449 INFO L93 Difference]: Finished difference Result 89 states and 107 transitions. [2021-12-21 12:51:11,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-21 12:51:11,449 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 148 [2021-12-21 12:51:11,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:11,450 INFO L225 Difference]: With dead ends: 89 [2021-12-21 12:51:11,450 INFO L226 Difference]: Without dead ends: 84 [2021-12-21 12:51:11,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:51:11,455 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 2 mSDsluCounter, 1126 mSDsCounter, 0 mSdLazyCounter, 973 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1197 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:11,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1197 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 973 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:51:11,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-21 12:51:11,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-12-21 12:51:11,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 22 states have call successors, (22), 4 states have call predecessors, (22), 3 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-21 12:51:11,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2021-12-21 12:51:11,469 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 148 [2021-12-21 12:51:11,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:11,470 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2021-12-21 12:51:11,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:51:11,470 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2021-12-21 12:51:11,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-12-21 12:51:11,471 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:11,471 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:11,480 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:11,677 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 [2021-12-21 12:51:11,677 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:11,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:11,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1810280833, now seen corresponding path program 20 times [2021-12-21 12:51:11,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:11,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742591581] [2021-12-21 12:51:11,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:11,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:11,685 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:11,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [725536284] [2021-12-21 12:51:11,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:51:11,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:11,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:11,687 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) [2021-12-21 12:51:11,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 12:51:12,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:51:12,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:12,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-21 12:51:12,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:13,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 42 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-12-21 12:51:13,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:13,278 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:13,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742591581] [2021-12-21 12:51:13,278 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:13,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725536284] [2021-12-21 12:51:13,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725536284] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:13,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:13,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-12-21 12:51:13,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273447427] [2021-12-21 12:51:13,279 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:13,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-21 12:51:13,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:13,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-21 12:51:13,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:51:13,280 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-21 12:51:13,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:13,831 INFO L93 Difference]: Finished difference Result 92 states and 111 transitions. [2021-12-21 12:51:13,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-21 12:51:13,831 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 155 [2021-12-21 12:51:13,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:13,832 INFO L225 Difference]: With dead ends: 92 [2021-12-21 12:51:13,832 INFO L226 Difference]: Without dead ends: 87 [2021-12-21 12:51:13,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=839, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:51:13,833 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 2 mSDsluCounter, 1223 mSDsCounter, 0 mSdLazyCounter, 1063 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:13,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1297 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1063 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:51:13,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-21 12:51:13,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-12-21 12:51:13,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:51:13,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 106 transitions. [2021-12-21 12:51:13,843 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 106 transitions. Word has length 155 [2021-12-21 12:51:13,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:13,844 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 106 transitions. [2021-12-21 12:51:13,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-21 12:51:13,844 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 106 transitions. [2021-12-21 12:51:13,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-12-21 12:51:13,845 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:13,846 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:13,857 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:14,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:14,052 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:14,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:14,053 INFO L85 PathProgramCache]: Analyzing trace with hash 548269752, now seen corresponding path program 21 times [2021-12-21 12:51:14,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:14,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313898938] [2021-12-21 12:51:14,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:14,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:14,060 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:14,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [704395821] [2021-12-21 12:51:14,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:51:14,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:14,060 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:14,061 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:14,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-21 12:51:14,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-12-21 12:51:14,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:14,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 92 conjunts are in the unsatisfiable core [2021-12-21 12:51:14,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:15,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-12-21 12:51:15,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:15,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:15,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313898938] [2021-12-21 12:51:15,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:15,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704395821] [2021-12-21 12:51:15,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704395821] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:15,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:15,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-12-21 12:51:15,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290309134] [2021-12-21 12:51:15,810 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:15,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 12:51:15,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:15,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 12:51:15,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:51:15,812 INFO L87 Difference]: Start difference. First operand 87 states and 106 transitions. Second operand has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:51:16,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:16,409 INFO L93 Difference]: Finished difference Result 95 states and 115 transitions. [2021-12-21 12:51:16,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:51:16,409 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 162 [2021-12-21 12:51:16,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:16,410 INFO L225 Difference]: With dead ends: 95 [2021-12-21 12:51:16,410 INFO L226 Difference]: Without dead ends: 90 [2021-12-21 12:51:16,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:51:16,411 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 2 mSDsluCounter, 1324 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1401 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:16,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1401 Invalid, 1157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:51:16,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-12-21 12:51:16,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-12-21 12:51:16,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 24 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:51:16,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 110 transitions. [2021-12-21 12:51:16,419 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 110 transitions. Word has length 162 [2021-12-21 12:51:16,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:16,419 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 110 transitions. [2021-12-21 12:51:16,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:51:16,420 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 110 transitions. [2021-12-21 12:51:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-12-21 12:51:16,421 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:16,421 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:16,428 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-21 12:51:16,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:16,628 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:16,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:16,628 INFO L85 PathProgramCache]: Analyzing trace with hash -954681951, now seen corresponding path program 22 times [2021-12-21 12:51:16,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:16,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776852636] [2021-12-21 12:51:16,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:16,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:16,645 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:16,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1027194008] [2021-12-21 12:51:16,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:51:16,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:16,653 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:16,653 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:16,680 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-21 12:51:17,220 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:17,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:17,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 96 conjunts are in the unsatisfiable core [2021-12-21 12:51:17,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:17,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 46 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-12-21 12:51:17,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:18,083 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:18,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776852636] [2021-12-21 12:51:18,084 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:18,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027194008] [2021-12-21 12:51:18,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027194008] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:18,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:18,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-12-21 12:51:18,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273100885] [2021-12-21 12:51:18,085 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:18,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-21 12:51:18,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:18,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-21 12:51:18,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:51:18,086 INFO L87 Difference]: Start difference. First operand 90 states and 110 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:51:18,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:18,718 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2021-12-21 12:51:18,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-21 12:51:18,719 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) Word has length 169 [2021-12-21 12:51:18,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:18,720 INFO L225 Difference]: With dead ends: 98 [2021-12-21 12:51:18,720 INFO L226 Difference]: Without dead ends: 93 [2021-12-21 12:51:18,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:51:18,721 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 2 mSDsluCounter, 1429 mSDsCounter, 0 mSdLazyCounter, 1255 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1509 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:18,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1509 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1255 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:51:18,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-21 12:51:18,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-12-21 12:51:18,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 25 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-12-21 12:51:18,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 114 transitions. [2021-12-21 12:51:18,731 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 114 transitions. Word has length 169 [2021-12-21 12:51:18,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:18,732 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 114 transitions. [2021-12-21 12:51:18,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:51:18,732 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 114 transitions. [2021-12-21 12:51:18,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-12-21 12:51:18,733 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:18,733 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:18,739 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:18,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-21 12:51:18,940 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:18,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:18,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1441462632, now seen corresponding path program 23 times [2021-12-21 12:51:18,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:18,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011304612] [2021-12-21 12:51:18,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:18,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:18,948 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:18,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [376611522] [2021-12-21 12:51:18,948 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:51:18,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:18,948 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:18,949 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:18,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process